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# -------------------------------------------------------------------- |
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# LST2005 -- Python Modul zur Berechnung der Deutschen Lohnsteuer 2005 |
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# $Id$ |
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# -------------------------------------------------------------------- |
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# |
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# Copyright (c) 2005 by Intevation GmbH |
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# Authors: |
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# Sascha Wilde <[email protected]> |
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# |
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# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with this package for details. |
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|
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"""Lohnsteuerberechnung nach dem offiziellen Programmablaufplan |
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wie in Programmablaufplan-LSt.pdf dokumentiert.""" |
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|
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# Die Variablen Namen sind hässlich, die Algorithmen nicht |
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# dokumentiert, der Code grausam -- dafür entspricht alles Zeile für |
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# Zeile obigem Dokument. Jedenfalls sollte es so sein... |
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|
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from math import ceil, floor |
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|
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# Wir brauchen eigene Rundungsfunktionen mit definierter Präzision |
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def FixedPointFloor(value, precision=2): |
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i = 10.0 ** precision |
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return floor(value * i) / i |
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|
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def FixedPointCeil(value, precision=2): |
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i = 10.0 ** precision |
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return ceil(value * i) / i |
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|
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# Ein paar Konstanten um das ganze etwas Benutzbarer zu machen: |
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JAHR = 1 |
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MONAT = 2 |
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WOCHE = 3 |
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TAG = 4 |
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I = 1 |
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II = 2 |
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III = 3 |
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IV = 4 |
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V = 5 |
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VI = 6 |
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|
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class LST: |
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def __init__(self, |
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RE4=0, |
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ALTER1=0, |
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HINZUR=0, |
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JFREIB=0, |
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JHINZU=0, |
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JRE4 =0, |
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JVBEZ =0, |
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KRV =0, |
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LZZ =2, |
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R =0, |
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SONSTB=0, |
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STKL =1, |
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VBEZ =0, |
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VBEZM =0, |
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VBEZS =0, |
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VBS =0, |
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VMT =0, |
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WFUNDF=0, |
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ZKF =0, |
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ZMVB =0): |
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self.Set_RE4(RE4) |
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self.Set_ALTER1(ALTER1) |
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self.Set_HINZUR(HINZUR) |
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self.Set_JFREIB(JFREIB) |
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self.Set_JHINZU(JHINZU) |
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self.Set_JRE4(JRE4) |
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self.Set_JVBEZ(JVBEZ) |
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self.Set_KRV(KRV) |
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self.Set_LZZ(LZZ) |
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self.Set_R(R) |
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self.Set_SONSTB(SONSTB) |
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self.Set_STKL(STKL) |
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self.Set_VBEZ(VBEZ) |
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self.Set_VBEZM(VBEZM) |
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self.Set_VBEZS(VBEZS) |
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self.Set_VBS(VBS) |
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self.Set_VMT(VMT) |
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self.Set_WFUNDF(WFUNDF) |
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self.Set_ZKF(ZKF) |
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self.Set_ZMVB(ZMVB) |
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# Vorgegebene Ausgangsparameter |
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self.BK = 0 |
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self.BKS = 0 |
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self.BKV = 0 |
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self.LSTLZZ = 0 |
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self.SOLZLZZ = 0 |
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self.SOLZS = 0 |
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self.SOLZV = 0 |
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self.STS = 0 |
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self.STV = 0 |
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|
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def Calc(self): |
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"""Berechnet die Lohnsteuer, |
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setzt BK, BKS, BKV, LSTLZZ, SOLZLZZ, SOLZS, SOLZV, STS und STV""" |
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# Interne Felder |
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# Laut Dokumentation sollen diese vor der Berechnung gelöscht werden, |
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# es ist mir nicht klar, ob das wirklich nötig ist... |
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self._ALTE = 0 |
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self._ANP = 0 |
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self._ANTEIL1 = 0 |
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self._ANTEIL2 = 0 |
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self._BMG = 0 |
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self._DIFF = 0 |
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self._EFA = 0 |
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self._FVB = 0 |
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self._FVBZ = 0 |
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self._JBMG = 0 |
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self._JW = 0 |
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self._KENNZ = 0 |
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self._KFB = 0 |
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self._KZTAB = 1 |
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self._LSTJAHR = 0 |
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self._LST1 = 0 |
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self._LST2 = 0 |
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self._LST3 = 0 |
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self._MIST = 0 |
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self._RE4LZZ = 0 |
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self._RE4LZZV = 0 |
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self._RW = 0.0 |
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self._SAP = 0 |
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self._SOLZFREI = 0 |
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self._SOLZJ = 0.0 # 2 Dezimalstellen |
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self._SOLZMIN = 0.0 # 2 Dezimalstellen |
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self._ST = 0 |
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self._ST1 = 0 |
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self._ST2 = 0 |
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self._VBEZB = 0 |
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self._VHB = 0 |
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self._VSP = 0.0 # 2 Dezimalstellen |
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self._VSPN = 0 |
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self._VSP1 = 0.0 # 2 Dezimalstellen |
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self._VSP2 = 0.0 # 2 Dezimalstellen |
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self._VSPKURZ = 0 |
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self._VSPMAX1 = 0 |
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self._VSPMAX2 = 0 |
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self._VSPO = 0.0 # 2 Dezimalstellen |
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self._VSPREST = 0.0 # 2 Dezimalstellen |
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self._VSPVOR = 0.0 # 2 Dezimalstellen |
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# Jetzt wirds richtig toll: X und Y |
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# kann mal bitte jemand den Verantwortlichen für diese |
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# Variablen Namen schlagen? |
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self._X = 0.0 # 2 Dezimalstellen |
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self._Y = 0.0 # 6 Dezimalstellen |
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self._ZRE4 = 0.0 # 2 Dezimalstellen |
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self._ZRE4VP = 0.0 # 2 Dezimalstellen |
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self._ZRE4VP1 = 0.0 # 2 Dezimalstellen |
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self._ZTABFB = 0 |
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self._ZVE = 0 |
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self._ZX = 0 |
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self._ZZX = 0 |
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self._HOCH = 0 |
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self._VERGL = 0 |
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# ------------------------------------------------------------ |
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# Anfang der Berechnung |
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self._MRE4LZZ() |
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self._RE4LZZ = self.RE4 - self._FVB \ |
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- self._ALTE - self.WFUNDF \ |
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+ self.HINZUR |
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self._RE4LZZV = self.RE4 - self._FVB - self._ALTE |
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self._MRE4() |
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self._MZTABFB() |
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self._MLSTJAHR() |
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self._LSTJAHR = self._ST |
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self._JW = self._LSTJAHR * 100 |
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self._UPANTEIL() |
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self.LSTLZZ = self._ANTEIL1 |
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if self.ZKF > 0: |
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self._ZTABFB += self._KFB |
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self._MLSTJAHR() |
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self._JBMG = self._ST |
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else: |
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self._JBMG = self._LSTJAHR |
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self._MSOLZ() |
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self._MSONST() |
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self._MVMT() |
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|
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# Benutzte Unterprogramme: |
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def _MRE4LZZ(self): |
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if self.VBEZ == 0: |
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self._FVBZ = 0 |
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self._FVB = 0 |
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else: |
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if self.LZZ == 1: |
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self._VBEZB = self.VBEZM * self.ZMVB + self.VBEZS |
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self._FVBZ = 75 * self.ZMVB |
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else: |
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self._VBEZB = self.VBEZM * 12 + self.VBEZS |
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self._FVBZ = 900 |
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self._FVB = ceil(self._VBEZB * 0.4) |
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if self._FVB > 300000: |
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self._FVB = 300000 |
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self._JW = self._FVB |
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self._UPANTEIL() |
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self._FVB = self._ANTEIL2 |
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if self.ALTER1 == 0: |
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self._ALTE = 0 |
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else: |
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self._BMG = self.RE4 - self.VBEZ |
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self._ALTE = ceil(self._BMG * 0.4) |
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self._JW = 190000 |
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self._UPANTEIL() |
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if self._ALTE > self._ANTEIL2: |
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self._ALTE = self._ANTEIL2 |
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|
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def _MRE4(self): |
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if self.LZZ == 1: |
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self._ZRE4 = FixedPointFloor(self._RE4LZZ / 100.0) |
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self._ZRE4VP = FixedPointFloor(self._RE4LZZV / 100.0) |
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elif self.LZZ == 2: |
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self._ZRE4 = FixedPointFloor((self._RE4LZZ + 0.67) * 0.12) |
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self._ZRE4VP = FixedPointFloor((self._RE4LZZV + 0.67) * 0.12) |
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elif self.LZZ == 3: |
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self._ZRE4 = FixedPointFloor((self._RE4LZZ + 0.89) * 3.6 / 7) |
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self._ZRE4VP = FixedPointFloor((self._RE4LZZV + 0.89) * 3.6 / 7) |
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else: |
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self._ZRE4 = FixedPointFloor((self._RE4LZZ + 0.56) * 3.6) |
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self._ZRE4VP = FixedPointFloor((self._RE4LZZV + 0.56) * 3.6) |
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if self._ZRE4 < 0: |
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self._ZRE4 = 0.0 |
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|
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def _MZTABFB(self): |
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self._KZTAB = 1 |
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if self.STKL < 6: |
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if self.VBEZ > 0: |
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self._ANP = 102 |
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if self.RE4 > self.VBEZ: |
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self._ANP += 920 |
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else: |
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self._ANP = 0 |
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if self.STKL == 1: |
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self._SAP = 36 |
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self._KFB = self.ZKF * 5808 |
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elif self.STKL == 2: |
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self._EFA = 1308 |
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self._SAP = 36 |
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self._KFB = self.ZKF * 5808 |
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elif self.STKL == 3: |
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self._KZTAB = 2 |
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self._SAP = 72 |
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self._KFB = self.ZKF * 5808 |
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elif self.STKL == 4: |
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self._SAP = 36 |
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self._KFB = self.ZKF * 2904 |
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else: |
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self._KFB = 0 |
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self._ZTABFB = self._EFA + self._ANP + self._SAP + self._FVBZ |
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self._KENNZ = 0 |
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|
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def _MLSTJAHR(self): |
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if self.STKL < 5: |
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self._UPEVP() |
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else: |
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self._VSP = 0.0 |
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self._ZVE = self._ZRE4 - self._ZTABFB - self._VSP |
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if self._ZVE < 1: |
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self._ZVE = self._X = 0.0 |
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else: |
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self._X = floor(float(self._ZVE) / self._KZTAB) |
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if self.STKL < 5: |
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self._UPTAB05() |
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else: |
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self._MST5_6() |
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|
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def _UPEVP(self): |
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if self.KRV == 1: |
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self._VSP1 = 1.0 |
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else: |
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if self._ZRE4VP > 62400: |
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self._ZRE4VP = 62400.0 |
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self._VSP1 = 0.2 * self._ZRE4VP |
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self._VSP1 = self._VSP1 * 0.0975 |
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self._VSP2 = 0.11 * self._ZRE4VP |
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self._VHB = 1500 * self._KZTAB |
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if self._VSP2 > self._VHB: |
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self._VSP2 = self._VHB |
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self._VSPN = ceil(self._VSP1 + self._VSP2) |
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self._MVSP() |
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if self._VSPN > self._VSP: |
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self._VSP = self._VSPN |
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|
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def _MVSP(self): |
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self._VSPO = self._ZRE4VP * 0.2 |
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self._VSPVOR = 3068 * self._KZTAB |
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self._VSPMAX1 = 1334 * self._KZTAB |
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self._VSPMAX2 = 667 * self._KZTAB |
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self._VSPKURZ = 1134 * self._KZTAB |
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if self.KRV == 1: |
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if self._VSPO > self._VSPKURZ: |
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self._VSP = self._VSPKURZ |
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else: |
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self._VSP = ceil(self._VSPO) |
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else: |
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self._UMVSP() |
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|
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def _UMVSP(self): |
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if self._KENNZ == 1: |
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self._VSPVOR = self._VSPVOR - self._ZRE4VP1 * 0.16 |
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else: |
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self._VSPVOR = self._VSPVOR - self._ZRE4VP * 0.16 |
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if self._VSPVOR < 0: |
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self._VSPVOR = 0.0 |
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if self._VSPO > self._VSPVOR: |
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self._VSP = self._VSPVOR |
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self._VSPREST = self._VSPO - self._VSPVOR |
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if self._VSPREST > self._VSPMAX1: |
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self._VSP += self._VSPMAX1 |
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self._VSPREST = FixedPointCeil((self._VSPREST - self._VSPMAX1) / 2.0) |
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if self._VSPREST > self._VSPMAX2: |
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self._VSP = ceil(self._VSP + self._VSPMAX2) |
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else: |
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self._VSP = ceil(self._VSP + self._VSPREST) |
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else: |
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self._VSP = ceil(self._VSP + self._VSPREST) |
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else: |
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self._VSP = ceil(self._VSPO) |
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|
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def _MST5_6(self): |
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self._ZZX = self._X |
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if self._ZZX > 25812: |
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self._ZX = 25812 |
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self._UP5_6() |
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self._ST = floor(self._ST + (self._ZZX - 25812) * 0.42) |
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else: |
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self._ZX = self._ZZX |
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self._UP5_6() |
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if self._ZZX > 9144: |
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self._VERGL = self._ST |
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self._ZX = 9144 |
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self._UP5_6() |
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self._HOCH = floor(self._ST + (self._ZZX - 9144) * 0.42) |
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if self._HOCH < self._VERGL: |
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self._ST = self._HOCH |
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else: |
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self._ST = self._VERGL |
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|
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def _UP5_6(self): |
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self._X = self._ZX * 1.25 |
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self._UPTAB05() |
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self._ST1 = self._ST |
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self._X = self._ZX * 0.75 |
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self._UPTAB05() |
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self._ST2 = self._ST |
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self._DIFF = (self._ST1 - self._ST2) * 2 |
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self._MIST = floor(self._ZX * 0.15) |
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if self._MIST > self._DIFF: |
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self._ST = self._MIST |
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else: |
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self._ST = self._DIFF |
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|
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def _MSOLZ(self): |
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self._SOLZFREI = 972 * self._KZTAB |
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if self._JBMG > self._SOLZFREI: |
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self._SOLZJ = FixedPointFloor(self._JBMG * 5.5 / 100.0) |
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self._SOLZMIN = (self._JBMG - self._SOLZFREI) * 20 / 100.0 |
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if self._SOLZMIN < self._SOLZJ: |
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self._SOLZJ = self._SOLZMIN |
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self._JW = self._SOLZJ * 100 |
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self._UPANTEIL() |
| 363 |
self.SOLZLZZ = self._ANTEIL1 |
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else: |
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self.SOLZLZZ = 0 |
| 366 |
if self.R > 0: |
| 367 |
self._JW = self._JBMG * 100 |
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self._UPANTEIL |
| 369 |
self.BK = self._ANTEIL1 |
| 370 |
else: |
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self.BK = 0 |
| 372 |
|
| 373 |
def _UPANTEIL(self): |
| 374 |
if self.LZZ == 1: |
| 375 |
self._ANTEIL1 = self._JW |
| 376 |
self._ANTEIL2 = self._JW |
| 377 |
elif self.LZZ == 2: |
| 378 |
self._ANTEIL1 = floor(self._JW / 12.0) |
| 379 |
self._ANTEIL2 = ceil(self._JW / 12.0) |
| 380 |
elif self.LZZ == 3: |
| 381 |
self._ANTEIL1 = floor(self._JW * 7 / 360.0) |
| 382 |
self._ANTEIL2 = ceil(self._JW * 7 / 360.0) |
| 383 |
else: |
| 384 |
self._ANTEIL1 = floor(self._JW / 360.0) |
| 385 |
self._ANTEIL2 = ceil(self._JW / 360.0) |
| 386 |
|
| 387 |
def _UPTAB05(self): |
| 388 |
if self._X < 7665: |
| 389 |
self._ST = 0 |
| 390 |
elif self._X < 12740: |
| 391 |
self._Y = (self._X - 7664) / 10000.0 |
| 392 |
self._RW = self._Y * 883.74 |
| 393 |
self._RW += 1500 |
| 394 |
self._ST = floor(self._RW * self._Y) |
| 395 |
elif self._X < 52152: |
| 396 |
self._Y = (self._X - 12739) / 10000.0 |
| 397 |
self._RW = self._Y * 228.74 |
| 398 |
self._RW += 2397 |
| 399 |
self._RW *= self._Y |
| 400 |
self._ST = floor(self._RW + 989) |
| 401 |
else: |
| 402 |
self._ST = floor(self._X * 0.42 - 7914) |
| 403 |
self._ST *= self._KZTAB |
| 404 |
|
| 405 |
def _MSONST(self): |
| 406 |
if self.SONSTB > 0: |
| 407 |
# ------------------------------ |
| 408 |
# Nicht im offiziellen Programm- |
| 409 |
# ablaufplan: Attribute sichern |
| 410 |
old_lzz = self.LZZ |
| 411 |
old_vbez = self.VBEZ |
| 412 |
old_re4 = self.RE4 |
| 413 |
# ------------------------------ |
| 414 |
self.LZZ = 1 |
| 415 |
self.VBEZ = self.JVBEZ |
| 416 |
self.RE4 = self.JRE4 |
| 417 |
self._MRE4LZZ() |
| 418 |
self._MRE4LZZ2() |
| 419 |
self._MRE4() |
| 420 |
self._MZTABFB() |
| 421 |
self._MLSTJAHR() |
| 422 |
self._LST1 = self._ST * 100 |
| 423 |
self.VBEZ = self.JVBEZ + self.VBS |
| 424 |
self.RE4 = self.JRE4 + self.SONSTB |
| 425 |
self._MRE4LZZ() |
| 426 |
self._MRE4LZZ2() |
| 427 |
self._MRE4() |
| 428 |
self._MLSTJAHR() |
| 429 |
self._LST2 = self._ST * 100 |
| 430 |
self.STS = self._LST2 - self._LST1 |
| 431 |
self.SOLZS = self.STS * 5.5 / 100 |
| 432 |
if self.R > 0: |
| 433 |
self.BKS = self.STS |
| 434 |
else: |
| 435 |
self.BKS = 0 |
| 436 |
# ------------------------------ |
| 437 |
# Nicht im offiziellen Programm- |
| 438 |
# ablaufplan: Attribute |
| 439 |
# wiederherstellen |
| 440 |
self.LZZ = old_lzz |
| 441 |
self.VBEZ = old_vbez |
| 442 |
self.RE4 = old_re4 |
| 443 |
# ------------------------------ |
| 444 |
else: |
| 445 |
self.STS = 0 |
| 446 |
self.SOLZS = 0 |
| 447 |
self.BKS = 0 |
| 448 |
|
| 449 |
def _MRE4LZZ2(self): |
| 450 |
self._RE4LZZ = self.RE4 - self._FVB - self._ALTE \ |
| 451 |
- self.JFREIB + self.JHINZU |
| 452 |
self._RE4LZZV = self.RE4 - self._FVB - self._ALTE |
| 453 |
|
| 454 |
def _MVMT(self): |
| 455 |
if self.VMT > 0: |
| 456 |
# ------------------------------ |
| 457 |
# Nicht im offiziellen Programm- |
| 458 |
# ablaufplan: Attribute sichern |
| 459 |
old_lzz = self.LZZ |
| 460 |
old_vbez = self.VBEZ |
| 461 |
old_re4 = self.RE4 |
| 462 |
# ------------------------------ |
| 463 |
self.LZZ = 1 |
| 464 |
self.VBEZ = self.JVBEZ + self.VBS |
| 465 |
self.RE4 = self.JRE4 + self.SONSTB |
| 466 |
self._MRE4LZZ() |
| 467 |
self._MRE4LZZ2() |
| 468 |
self._MRE4() |
| 469 |
self._MZTABFB() |
| 470 |
self._MLSTJAHR() |
| 471 |
self._LST1 = self._ST * 100 |
| 472 |
self.RE4 = self.JRE4 + self.SONSTB + self.VMT |
| 473 |
self._MRE4LZZ() |
| 474 |
self._MRE4LZZ2() |
| 475 |
self._MRE4() |
| 476 |
self._KENNZ = 1 |
| 477 |
self._ZRE4VP1 = self._ZRE4VP |
| 478 |
self._MLSTJAHR() |
| 479 |
self._LST3 = self._ST * 100 |
| 480 |
self.RE4 = self.JRE4 + self.SONSTB |
| 481 |
self._MRE4LZZ() |
| 482 |
self.RE4 = self.JRE4 + self.SONSTB + self.VMT / 5 |
| 483 |
self._MRE4LZZ2() |
| 484 |
self._MRE4() |
| 485 |
self._MLSTJAHR() |
| 486 |
self._LST2 = self._ST * 100 |
| 487 |
self.STV = (self._LST2 - self.LST1) * 5 |
| 488 |
self._LST3 -= self._LST1 |
| 489 |
if self._LST3 < self.STV: |
| 490 |
self.STV = self._LST3 |
| 491 |
self.SOLZV = floor(self.STV * 5.5 / 100) |
| 492 |
if self.R > 0: |
| 493 |
self.BKV = self.STV |
| 494 |
else: |
| 495 |
self.BKV = 0 |
| 496 |
# ------------------------------ |
| 497 |
# Nicht im offiziellen Programm- |
| 498 |
# ablaufplan: Attribute |
| 499 |
# wiederherstellen |
| 500 |
self.LZZ = old_lzz |
| 501 |
self.VBEZ = old_vbez |
| 502 |
self.RE4 = old_re4 |
| 503 |
# ------------------------------ |
| 504 |
else: |
| 505 |
self.STV = 0 |
| 506 |
self.SOLZV = 0 |
| 507 |
self.BKV = 0 |
| 508 |
|
| 509 |
# Methoden zum geprüften setzen der Wert |
| 510 |
# FIX ME: Prüfung _sehr_ unvollständig |
| 511 |
def Set_RE4(self, value): |
| 512 |
assert value >= 0, "must not be negative" |
| 513 |
self.RE4 = value |
| 514 |
|
| 515 |
def Set_ALTER1(self, value): |
| 516 |
assert value in (0,1), "must be 0 or 1" |
| 517 |
self.ALTER1 = value |
| 518 |
|
| 519 |
def Set_HINZUR(self, value): |
| 520 |
self.HINZUR = value |
| 521 |
|
| 522 |
def Set_JFREIB(self, value): |
| 523 |
self.JFREIB = value |
| 524 |
|
| 525 |
def Set_JHINZU(self, value): |
| 526 |
self.JHINZU = value |
| 527 |
|
| 528 |
def Set_JRE4(self, value): |
| 529 |
self.JRE4 = value |
| 530 |
|
| 531 |
def Set_JVBEZ(self, value): |
| 532 |
self.JVBEZ = value |
| 533 |
|
| 534 |
def Set_KRV(self, value): |
| 535 |
if value not in (0,1): |
| 536 |
raise ValueError |
| 537 |
self.KRV = value |
| 538 |
|
| 539 |
def Set_LZZ(self, value): |
| 540 |
assert value in (1,2,3,4), "must be in range 1-4 (JAHR, MONAT, WOCHE, TAG)" |
| 541 |
self.LZZ = value |
| 542 |
|
| 543 |
def Set_R(self, value): |
| 544 |
self.R = value |
| 545 |
|
| 546 |
def Set_SONSTB(self, value): |
| 547 |
self.SONSTB = value |
| 548 |
|
| 549 |
def Set_STKL(self, value): |
| 550 |
assert value in (1,2,3,4,5,6), "must be in range 1-6 (I II III IV V VI)" |
| 551 |
self.STKL = value |
| 552 |
|
| 553 |
def Set_VBEZ(self, value): |
| 554 |
self.VBEZ = value |
| 555 |
|
| 556 |
def Set_VBEZM(self, value): |
| 557 |
self.VBEZM = value |
| 558 |
|
| 559 |
def Set_VBEZS(self, value): |
| 560 |
self.VBEZS = value |
| 561 |
|
| 562 |
def Set_VBS(self, value): |
| 563 |
self.VBS = value |
| 564 |
|
| 565 |
def Set_VMT(self, value): |
| 566 |
self.VMT = value |
| 567 |
|
| 568 |
def Set_WFUNDF(self, value): |
| 569 |
self.WFUNDF = value |
| 570 |
|
| 571 |
def Set_ZKF(self, value): |
| 572 |
self.ZKF = value |
| 573 |
|
| 574 |
def Set_ZMVB(self, value): |
| 575 |
self.ZMVB = value |
| 576 |
|
| 577 |
# -------------------------------------------------------------------- |
| 578 |
# Eine etwas schönere API: |
| 579 |
# |
| 580 |
|
| 581 |
class LStRechner2005(LST): |
| 582 |
def __init__(self): |
| 583 |
LST.__init__(self) |
| 584 |
|
| 585 |
def SetLohn(self, lohn): |
| 586 |
self.Set_RE4(lohn * 100.0) |
| 587 |
|
| 588 |
def SetZeitraum(self, lzz): |
| 589 |
self.Set_LZZ(lzz) |
| 590 |
|
| 591 |
def SetSteuerklasse(self, stkl): |
| 592 |
self.Set_STKL(stkl) |
| 593 |
|
| 594 |
def GetLohnsteuer(self): |
| 595 |
return round(self.LSTLZZ / 100, 2) |
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