Issues

• PARAMETER UPDATE: 2027

  ttsim-dev/gettsim#1255 · Filter by author MImmesberger opened on Nov 3, 2026

• Arbeitslosengeld before August 1998 is not implemented

  tax-transfer-feature
  ttsim-dev/gettsim#1253 · Filter by author MImmesberger opened on Nov 1, 2026

• Lohnsteuer 2026: Aktivrente (§ 3 Nr. 21 EStG) is never applied in Steuerklasse VI

  ttsim-dev/gettsim#1249 · Filter by author rifmj opened on Oct 21, 2026
  2

• Grundrente income: one tenth of § 20 Abs. 1 Nr. 6 EStG capital income (§ 97a Abs. 2 S. 1 Nr. 3 SGB VI)

  ttsim-dev/gettsim#1248 · Filter by author MImmesberger opened on Oct 18, 2026

• Grundrente income: include the tax-free part of Versorgungsbezüge (§ 97a Abs. 2 S. 1 Nr. 2 SGB VI)

  ttsim-dev/gettsim#1247 · Filter by author MImmesberger opened on Oct 18, 2026

• ALG II 2005-01-01 to 2005-09-30: nettoquote is NaN for zero gross wage

  ttsim-dev/gettsim#1245 · Filter by author hmgaudecker opened on Oct 16, 2026

• Bürgergeld / Arbeitslosengeld 2: Insolvenzgeld enters the § 11b Abs. 3 SGB II allowance as net, not gross

  tax-transfer-feature
  ttsim-dev/gettsim#1244 · Filter by author MImmesberger opened on Oct 12, 2026

• Ordinary income tax tariff ignores the rounding of its input

  tax-transfer-feature
  ttsim-dev/gettsim#1243 · Filter by author MImmesberger opened on Oct 11, 2026

• Introduce a central node for wages subject to income tax assessment

  enhancementtax-transfer-feature
  ttsim-dev/gettsim#1242 · Filter by author MImmesberger opened on Oct 11, 2026

• BUG: Childcare tax deduction: incorrect cap order and missing per-child calculation

  bug
  ttsim-dev/gettsim#1239 · Filter by author cpz-research opened on Oct 8, 2026

• BUG: Aktivrente allowance is not pro-rated for partial years (§ 3 Nr. 21 Satz 3 EStG)

  bug
  ttsim-dev/gettsim#1227 · Filter by author MImmesberger opened on Aug 25, 2026

• BUG: Aktivrente eligibility keys on the employee's pension contribution, not the employer's (§ 3 Nr. 21 EStG)

  bug
  ttsim-dev/gettsim#1225 · Filter by author MImmesberger opened on Aug 25, 2026
  1

• BUG: Altersentlastungsbetrag: cohort lookup is one year early

  bug
  ttsim-dev/gettsim#1224 · Filter by author MImmesberger opened on Aug 24, 2026
  1

• BUG: Altersentlastungsbetrag is computed on tax-exempt wage (Aktivrente, § 3 Nr. 21 EStG)

  bug
  ttsim-dev/gettsim#1223 · Filter by author MImmesberger opened on Aug 24, 2026
  1

• BUG: pre-2005 Vorsorgeaufwendungen under-deduct for jointly assessed couples (§ 10 Abs. 3 EStG doubling ignored)

  bug
  ttsim-dev/gettsim#1216 · Filter by author MImmesberger opened on Jul 23, 2026

• ENH: Deduplicate Kindergeld anzahl_ansprüche code

  enhancement
  ttsim-dev/gettsim#1214 · Filter by author MImmesberger opened on Jul 17, 2026

• BUG: § 32a Abs. 1 Progressionsfaktor reconstruction deviates by 1 euro from the published coefficients

  bug
  ttsim-dev/gettsim#1210 · Filter by author juliuswiener opened on Jul 9, 2026
  1

• BUG: § 32a Abs. 5 splitting rounds after doubling instead of before

  bug
  ttsim-dev/gettsim#1209 · Filter by author juliuswiener opened on Jul 9, 2026
  1

• Time conversions: support the SGB 30/360 legal day-count convention

  ttsim-dev/gettsim#1205 · Filter by author MImmesberger opened on Jun 27, 2026

• Vorsorgeaufwendungen and Aktivrente (proportional split)

  bug
  ttsim-dev/gettsim#1204 · Filter by author mjbloemer opened on Jun 26, 2026
  2

  

• Wohngeld income omits the non-taxable part of pensions (§ 14 Abs. 2 Nr. 3 WoGG)

  ttsim-dev/gettsim#1200 · Filter by author MImmesberger opened on Jun 12, 2026

• Implement Grundsicherungsreform (Bürgergeld → Grundsicherung, from 2026-07-01)

  tax-transfer-feature
  ttsim-dev/gettsim#1198 · Filter by author MImmesberger opened on Jun 8, 2026
  1

• Model the Unterhaltsrückgriff for Grundsicherung im Alter (§ 94 Abs. 1a SGB XII, since 2020)

  enhancementtax-transfer-feature
  ttsim-dev/gettsim#1197 · Filter by author MImmesberger opened on Jun 7, 2026

• Wohngeld: Werbungskosten are not deducted from pension income (§ 14 WoGG)

  ttsim-dev/gettsim#1194 · Filter by author MImmesberger opened on Jun 5, 2026

• pint units: register EUR/DM currencies in gettsim

  enhancementready-for-agentttsim
  ttsim-dev/gettsim#1191 · Filter by author MImmesberger opened on Jun 3, 2026