Changes

This is a record of all past gettsim releases and what went into them in reverse chronological order. Since v1.0, GETTSIM’s versioning follows a rule inspired by semantic versioning. Thus, for a given version number major.counter

• major is incremented when we make incompatible API changes, for example, changing the arguments to main in a major way or we completely change the modelling of some taxes or transfers.

• counter is incremented when we add functionality to the taxes and transfers system or change it in some non-fundamental way.

All releases are available on Anaconda.org.

Unreleased

• #1093 Fix taxation of pensions and add some missing parameters of the Wachstumschancengesetz 2024. (@MImmesberger)

• #1094 Make Vorsorgeaufwendungen a param function and update parameters of knappschaftliche RV and Kinderbetreuungskosten in ESt. (@MImmesberger)

v1.0 — 2025-08-26

• #1074 Make docs ready for 1.0 release. (@MImmesberger, @hmgaudecker)

• #1086 Tutorial for gettsim-personas. (@MImmesberger)

• #1083 Specify a fixed colormap for nodes in plot.dag.tt (@hmgaudecker)

• #1085 Let functions end on time; correct calculation of “Einkünfte aus Kapitalvermögen” (@hmgaudecker)

• #1084 Make sure GETTSIM interface is in sync with TTSIM interface (@hmgaudecker)

• #1076 Optimize bürgergeld__in_anderer_bg_als_kindergeldempfänger (@JuergenWiemers)

• #1072 How-to guide for plot.dag.tt (@hmgaudecker)

• #1071 Move to new plotting interface. (@MImmesberger)

• #1067 Separate Bürgergeld from Arbeitslosengeld 2 (@MImmesberger)

• #1064 Improve paths handling, small fixes (@hmgaudecker).

• #1062 Fix some end dates (@hmgaudecker)

• #1061 Remove private directories installed in site-packages (@hmgaudecker)

• #1060 Convert some ALG 2 parameters to ConsecutiveIntTableParamValue (@MImmesberger)

• #1059 Be consistent with ‘Erwerbseinkommen’ meaning income from self-employment and regular employment (@MImmesberger)

• #1058 Add dedicated namespace for Einnahmen (@MImmesberger)

• #1057 Use fail/warn mechanism for TT DAG elements (@hmgaudecker)

• #1056 Updates to plotting functions (@MImmesberger)

• #1054 DOC: Simple example and comprehensive how-to notebook (@MImmesberger)

• #804 The PR that has been collecting all changes over the past 7 months, which have been listed individually.

• #1052 Remove what has been extracted to TTSIM, add dependency on ttsim-backend (@hmgaudecker)

• #1050 Allow input template creation when path to root node traverses an automatically created function (@MImmesberger)

• #1048 Raise an error if invalid input paths are provided to main (@hmgaudecker)

• #1046 Fail if backend has changed (@hmgaudecker)

• #1046 Fail if backend has changed (@hmgaudecker)

• #1043 Raise more errors during vectorization (@hmgaudecker, @timmens)

• #1044 Fail if ParamFunctions depends on ColumnObjects (@MImmesberger, @hmgaudecker)

• #1042 Add copy_environment function (@timmens, @hmgaudecker)

• #1041 Don’t create DAG cycles via automatically added functions (@MImmesberger)

• #1040 Fix vorjahr (and similar) input names and their namespaces (@MImmesberger)

• #1035 Change the handling of policy_date, evaluation_date; remove date (@hmgaudecker, @MImmesberger)

• #1032 Clean up Wohngeld, Werbungskosten, Minjobs around the introduction of exemptions to social insurance contributions (@MImmesberger)

• #1038 Rename ist_selbstständig to ist_hauptberuflich_selbstständig (@MImmesberger)

• #1037 Improve performance of processed_data (@JuergenWiemers, @hmgaudecker, @mj023)

• #1031 Fix #1006, Improve error message when input data are missing and results are requested (@MImmesberger, @hmgaudecker)

• #1029 Change namespace of private Renteneinnahmen (@MImmesberger)

• #1033 Tighten ruff checks (@hmgaudecker, @MImmesberger)

• #1027 Better fail/warn tests (@MImmesberger, @hmgaudecker)

• #1017 Better error message for missing input data (@MImmesberger, @hmgaudecker)

• #1026 Fix bug in fail_if.input_df_mapper_columns_missing_in_df (@MImmesberger)

• #1028 Change calls of main so that main_target / main_targets is the first argument (@hmgaudecker)

• #1024 Split up fail_and_warn argument of main (@MImmesberger, @hmgaudecker)

• #1016 Turn fail_ifs and warn_ifs on + let main return a pytree, update pixi environments. (@MImmesberger, @timmens, @hmgaudecker) Unpublished

• #1018 Enable annotations for interface / tax-transfer functions (@hmgaudecker, @MImmesberger)

• #1013 Fix Rente Hinzuverdienstgrenze (@MImmesberger)

• #1015 Remaining parts of 2025 parameter update (@MImmesberger)

• #1012 Rente Angleichung Ost/West (@MImmesberger)

• #1011 Simple renamings. (@MImmesberger, @hmgaudecker)

• #1007 Remove kind input (@MImmesberger, @hmgaudecker)

• #1000 Use individual-specific Zusatzbeitrag (@MImmesberger, @hmgaudecker)

• #998 Add N-Dimensional Lookup Table (@mj023, @hmgaudecker)

• #1001 Rename: output -> main_target(s), targets -> tt_targets (@hmgaudecker, @MImmesberger)

• #997 Improve errors when executing the interface DAG (@MImmesberger, @hmgaudecker)

• #996 Updates to interface (@MImmesberger, @hmgaudecker)

• #991 Implement remaining interface components (@hmgaudecker, @MImmesberger)

• #993 Upserting of params: Makes all arguments but value of the params dataclasses optional (@MImmesberger, @hmgaudecker)

• #992 Fail if length of data input arrays differs. (@MImmesberger)

• #990 Remove config elements from policy environment (@MImmesberger, @hmgaudecker)

• #986 Make GETTSIM functions jittable (@hmgaudecker, @MImmesberger, @mj023)

• #987 Run fail_if functions first (@hmgaudecker, @MImmesberger)

• #985 Make date input dependent, improve logic of InputDependentInterfaceFunctions (@MImmesberger, @hmgaudecker)

• #984 Add ‘output’ keyword to main, fix tests (@hmgaudecker)

• #953 Hierarchical interface (@hmgaudecker, @MImmesberger, @mj023, @timmens)

• #957 Use relative paths for taxes and transfers (@MImmesberger)

• #955 ConsecutiveInt type for Anspruchsdauer ALG1 (@MImmesberger)

• #954 Improve implementation of Mehrbedarf für Alleinerziehende. (@MImmesberger)

• #948 Preliminary DAG-based interface (@hmgaudecker, @MImmesberger, @mj023)

• #943 Remove all occurrences of vectorization_strategy='loop' (@mj023)

• #947 METTSIM: Test overwriting scalar param / scalar param function with a data column (@MImmesberger)

• #945 Move param dataclasses to param_types.py (@MImmesberger)

• #897 Unify parsing of params (@hmgaudecker, @MImmesberger, @mj023)

• #899 Remove infrastructure to create synthetic data. (@MImmesberger)

• #894, #896 Cleanups (@MImmesberger, @hmgaudecker).

• #891 Prepare for jitting / vectorization of GETTSIM ({ghuser}hmgaudecker`).

• #879 Vectorize METTSIM (@timmens, @hmgaudecker).

• #887 Enable typing (@hmgaudecker, @timmens).

• #888 Remove SUPPORTED_GROUPINGS entirely, infer groupings from object names (@MImmesberger).

• #889 Refactor loader and fix check for time-dependent functions to span multiple modules that end up in the same namespace (@hmgaudecker).

• #885, #886: Cleanups (@MImmesberger).

• #867 Vectorize piecewise_polynomial (@mj023).

• #880 Validate parameter files using json schema (@hmgaudecker).

• #876 Add DataFrame to NestedData conversion (@MImmesberger).

• #873 Implement aggregation decorators (@hmgaudecker, @MImmesberger).

• #859 Add RoundingSpec dataclass (@hmgaudecker, @MImmesberger).

• #854 Add PolicyInput class and update hierarchy of TTSIM objects (@timmens, @hmgaudecker, @MImmesberger).

• #871 Require dashed iso date everywhere (@hmgaudecker).

• #865 Make top-level namespace include potential derived functions (@MImmesberger).

• #860 Use AggType instead of strings (@timmens).

• #864 Make compute_taxes_and_transfers jax-jittable (@timmens).

• #863 Add join_jax (@mj023).

• #862 Add all types of Einkünfte, introduce concept of Gesamtbetrag der Einkünfte (@MImmesberger).

• #861 Make fg_id invariant to ordering of data (@mj023).

• #858 Apply tree logic to GETTSIM tests (@felixschmitz).

• #856 Add METTSIM to test TTSIM part (@hmgaudecker, @timmens, @MImmesberger).

• #850 Split GETTSIM from TTSIM functions (@hmgaudecker, @MImmesberger).

• #805 Rename taxes and transers using new tree structure (@hmgaudecker, @MImmesberger).

• #818 Change behavior of namespaces so they are on the module level (@hmgaudecker, @MImmesberger).

• #780 Refactor infrastructure to work with dags.tree (@lars-reimann, @hmgaudecker, @MImmesberger).

• #807 Implement changes from 2. Jahressteuergesetz 2024 (@Eric-Sommer)

• #809 implement 2025 changes to pensions and social security contributions (@Eric-Sommer).

• #803 Apply correct rounding rules for Ehegattensplitting and update EStG parameters (@MImmesberger, @mjbloemer).

• #797 Update infrastructure to use pixi and modern pre-commit hooks (@timmens).

• #787 Model classes for policy functions and policy environments (@lars-reimann).

• #756 Refactor Elterngeld module and some small fixes (@MImmesberger, @ThOrtmann).

• #790 Add unterhaltsvors implementation 2009 to 2016 (@mjbloemer).

• #788 Pension benefit earnings test for early retirees (@MImmesberger).

• #786 Check directly whether child and parent are in same Bedarfsgemeinschaft for Kindergeldübertrag (@MImmesberger).

• #785 Add NotImplementedError to Unterhaltsvorschuss and test whether output from create_synthetic_data is enough to compute default targets (@MImmesberger).

• #772 Add Mindesteinkommen check to Wohngeld, calculate anz_eig_kind_bis_24 instead of requiring it as an input variable (@MImmesberger).

• #771 Move SGB II Regelsatz calculation from BG to individual level (@MImmesberger).

• #765 Kinderzuschlag only paid out if parents are in the same BG as the child (@MImmesberger).

• #766 Allow for user-provided grouping IDs. (@MImmesberger).

• #717 Switch from cohort-based policy to date-based policy in retirement module (@MImmesberger).

• #753 Vorrangprüfung of Wohngeld and ALG2 on bg level (@MImmesberger).

• #759 Unify function names in Sozialversicherung modules (@MImmesberger).

• #755 Allow array returns when skip_vectorization is being used, enforce import convention (@hmgaudecker).

• #751 Kindergeldübertrag (@MImmesberger).

• #739 Unterhaltsvorschuss calculation on child level (@MImmesberger).

• #725 KdU calculation on bg level and other small fixes (@MImmesberger, @ChristianZimpelmann).

• #722 Join columns to make target columns available at source level (@lars-reimann).

• #732 Change wealth input variable to individual-level (vermögen_bedürft) (@ChristianZimpelmann).

• #730 Add argument to create_synthetic_data on whether adults are married. (@ChristianZimpelmann).

• #729 Fix bugs in calculation of Unterhaltsvorschuss and Grundsicherung im Alter (@ChristianZimpelmann).

• #721 Optionally skip vectorization of a policy function (@lars-reimann).

• #720 Combined decorator for policy information (@lars-reimann).

• #700 Data columns overwrite functions regardless of time unit (@lars-reimann).

• #694 Replace tu groupings with correct groupings. (@MImmesberger, @lars-reimann, @hmgaudecker).

• #676 Add explicit parent-child links. (@MImmesberger).

• #684 New Issue template for yearly parameter updates. (@MImmesberger).

• #680 2024 Parameter Update (@Eric-Sommer, @MImmesberger)

• #662, #675 Replace hh in function names by bg/fg (@lars-reimann, @MImmesberger).

• #577 Implement Erwerbsminderungsrente (public disability insurance) (@nafetsk)

• #601 Add groupings sn_id, fg_id, and bg_id (@lars-reimann).

• #642 Vertrauensschutz for pension for unemployed (@TeBackh, @MImmesberger)

• #660 Entgeltpunkte Ost/West (@nafetsk).

• #659 Add rounding to Unterhaltsvorschuss, ESt, Wohngeld, Kinderzuschlag. (@MImmesberger).

• #655 Correct calculation of Lohnsteuer for 2015 to 2023 (@JakobWegmann).

• #653 Add Soli to Lohnsteuer test cases (@JakobWegmann).

• #636, #637 Reduced contribution rate for retirees for long-term care insurance until 2004 (@MImmesberger).

• #643 Fix bug in Midijobfaktor calculation in 2004. (@MImmesberger).

• #590 Add allowance for child income for Kinderzuschlag. (@ChristianZimpelmann).

• #620 Adds income from self employment to income for Bürgergeld (@amageh, @lillyfischer, @TeBackh)

• #634 Implement pension for unemployed (@TeBackh)

• #632 Zugangsfaktor calculation with monthly precision (@TeBackh).

• #624 Don’t create functions for other time units if this leads to a cycle in the graph (@lars-reimann).

• #630 Fixes bug in piecewise_polynomial that ignored jumps in intercepts (@nafetsk).

• #639 Infer columns_overriding_functions for compute_taxes_and_transfers from functions and data (@lars-reimann).

• #638 Don’t use functions in compute_taxes_and_transfers that are not active (@lars-reimann).

• #618, #623 Apply @dates_active decorator to Abgeltungssteuer, Midi- and Minijobs, Pflegeversicherung. (@hmgaudecker).

• #624 Don’t create functions for other time units if this leads to a cycle in the graph (@lars-reimann).

• #603 Add anz_eig_kind_bis_24 to synthetic (@ChristianZimpelmann).

• #593 Implement reform of gesetzliche Pflegepflegeversicherung effective as of 2023-07-01 (@paulinaschroeder).

• #602 Correct midijob_faktor_f (@paulinaschroeder).

• #600 Extend the access_different_date functionality for jahresanfang. (@paulinaschroeder).

• #591 Fix minor bug in wealth exemptions for Kinderzuschlag in 2023 (@ChristianZimpelmann).

• #589 Fix minor bug in arbeitsl_geld_2_eink_anr_frei_m (@ChristianZimpelmann).

• #583 Automatic conversion between different time units (@lars-reimann).

• #581 Add _y suffix to names of yearly variables (@lars-reimann).

v0.7 — 2023-05-14

• #514 Rewrite create_synthetic_data to make it more flexible and much faster. The function can no longer create households of different household types with one function call. (@ChristianZimpelmann).

• #573 Fix bug in age groups of Bürgergeld. (@ChristianZimpelmann).

• #150 Implement Lohnsteuer / withholding tax. (@Eric-Sommer, @JakobWegmann).

• #557 Apply @dates_active decorator in many cases. (@hmgaudecker).

• #405 Fix calculation of voluntary contribution by self-employed to the GKV. (@JHermann99)

• #495 Add @dates_active decorator to easily specify when a function is active. (@lars-reimann).

• #544 Add Kindesunterhalt (@LauraGergeleit).

• #529 Consider Elterngeld in other transfers only above a certain threshold. (@LauraGergeleit).

• #551 Add rounding to Wohngeld. (@LauraGergeleit).

• #425 Add Jax backend (@timmens).

v0.6.0 — 2023-01-30

• #503, #511, Move packaging to PyPI/conda-forge, update documentation (@timmens, @hmgaudecker).

• #487 Replace pydot_layout with pygraphviz_layout. (@lars-reimann).

• #457 Correct implementation of Arbeitslosengeld 1 (@paulinaschroeder)

• #484 Implement Kindersofortzuschlag. (@LauraGergeleit).

• #461 Fix bug in calculation of income for Kinderzuschlag. (@ChristianZimpelmann).

• #458 Calculate Vorsorgeaufwendungen on tax unit level and fix bug (@ChristianZimpelmann).

• #463 Adjust Günstigerprüfung between Kindergeld and Kinderfreibetrag such that Kindergeld is not set to 0 if Kinderfreibetrag is beneficial (@LauraGergeleit, @ChristianZimpelmann).

• #450, #500, #501 Update CI, use modern package structure (@hmgaudecker).

• #470 Execute notebooks as part of the documentation build on readthedocs (@hmgaudecker).

• #440 Implement Bürgergeld, which reforms arbeitsl_geld_2 from 01/01/2023 (@LauraGergeleit).

• #399 Use dags package to create the DAG (@ChristianZimpelmann).

• #415 Define supported groupings in config.py (@LauraGergeleit, @ChristianZimpelmann).

• #416 Add documentation page for Vermögensbegriff for transfers (@LauraGergeleit).

• #423 Model marginal employment rules reform from 10/2022 (@Eric-Sommer, @LauraGergeleit).

• #406 Change variable name from vermögen_hh to vermögen_bedürft_hh. Add test cases for several transfers (@LauraGergeleit).

• #380 Implement an automatic type conversion of imported variables. Adding test cases in test_interface.py (@LauraGergeleit, @ChristianZimpelmann).

• #403 Replace Bokeh with plotly for visualization. (@effieHAN,@sofyaakimova).

• #396, Implement pension for (very) long term insured, including eligibility criteria, i.e. “Wartezeiten”. Implement pension for women (@TeBackh), add more tests (#428, @LauraGergeleit).

• #393 Normal retirement age adjustment aligned with the rules (@TeBackh).

• #385 Make altersentlastungsbetrag dependent on age not on current date (@m-pannier, @lillyfischer).

• #392 Fix relative tolerance which was set too high for some tests. Rename vorsorge to vorsorgeaufw (@LauraGergeleit, @ChristianZimpelmann).

• #323 Align health insurance contribution parameters better aligned with law. Restructure calculation of ges_krankenv, minor changes to ges_pflegev. (@Eric-Sommer, @ChristianZimpelmann).

v0.5.1 — 2022-04-21

• #377 Fix wrong parameter value for ges_pflegev contribution (@JuergenWiemers).

• #383 Remove ä, ö, ü from file names (@ChristianZimpelmann).

v0.5.0 — 2022-04-01

• #327 Add behinderten_pauschbetrag for 1975-1986 (@lillyfischer).

• #285 Set up bokeh dashboard to visualize tax-benefit parameters (@Si-Pf, @Eric-Sommer).

• #306 Add the possibility to load the value of a parameter of the previous year when calling set_up_policy_environment (@ChristianZimpelmann).

• #275 Implement Grundrente. Implement Grundsicherung im Alter. Remove ges_rente_m as input. Rename gettsim.renten_anspr to gettsim.transfers.rente. Rename gettsim.social_insurance to gettsim.social_insurance_contributions (@davpahl, @ChristianZimpelmann).

• #307 Allow to specify order up to which ancestors and descendants are shown when plotting a dag (@ChristianZimpelmann).

• #310 Added Mehrbedarf G to Implementation of Grundsicherung im Alter (@paulinaschroeder).

• #311 Rename variable kaltmiete_m_hh to bruttokaltmiete_m_hh (@LauraGergeleit).

• #319 #320 Implement changes for social assistance and social insurance becoming effective in 2022 (@Eric-Sommer).

• #322 Add updated wohngeld parameters for 2022 (@mjbloemer, @lillyfischer).

• #312 Updated GEP-01 with effects on character limits, time and unit identifiers, adjustments for DAG backend (@hmgaudecker).

• #314 Enforce character limits from GEP-01 for all function names and input variables. Make variable names more precise (e.g., ges_ in front of all social insurance parameters that have private counterparts, eink_st everywhere the income tax is meant). Make variables consistent (e.g. kinderfreibetrag had different abbreviations, now kinderfreib everywhere). (@hmgaudecker, @ChristianZimpelmann)

• #343 New argument for `compute_taxes_and_transfers`: rounding. If set to False, rounding of outputs is disabled. Add rounding for eink_st_tu. Rounding for other functions will be introduced in future PRs. (@ChristianZimpelmann).

• #349 Create parameters for several hard coded numbers in code. (@LauraGergeleit).

• #355 Major renaming based on GEP 01, e.g.: correct use of _m-suffix; alleinerziehend becomes alleinerz; rename ges_rentenv.yaml to ges_rente.yaml (@hmgaudecker, @ChristianZimpelmann)

• #356 Define functions on scalars and have them vectorised. Implement aggregation functions on group levels. (@LauraGergeleit, @ChristianZimpelmann)

v0.4.2 — 2022-01-25

• Ensure GETTSIM works with Pandas 1.4 (#337)

v0.4.1 — 2021-04-11

• #248 Implement 2021 increase in lump sum tax deductions for disabled. (@Eric-Sommer).

• #254 Implement 2021 increase in unemployment benefits (@Eric-Sommer).

• #253 Implement 2021 changes in health insurance contribution rates and other social insurance regulations (@Eric-Sommer).

• #266 Adjust visualization.py to link nodes of DAGs to documentation properly (@davpahl, @ChristianZimpelmann).

• #267 Implement new calculation of Kinderzuschlag parameter (@Eric-Sommer).

• #252 Implement 2021 reforms to income tax tariff and family tax deductions (@Eric-Sommer).

• #235 Module to create synthetic data (@Eric-Sommer, @ChristianZimpelmann).

• #256 Implement 2021 housing benefit reform (@Eric-Sommer).

• #283 Implement Kinderbonus in 2020 and 2021 (@ChristianZimpelmann).

v0.4.0 — 2020-11-11

• #241 Renaming of directories: gettsim.benefits to gettsim.transfers; gettsim.soz_vers to gettsim.social_insurance; gettsim.data to gettsim.parameters (@MaxBlesch, @ChristianZimpelmann).

• #230 Add type hints and links all docstring variables to the documentation. Also all functions have a one liner docstring now (@MaxBlesch, @FelixAhlbrecht).

• #232 Introduce beginner tutorials on how to use GETTSIM (@amageh, @davpahl, @Trichter33).

• #185 Add the DAG code for renten_anspr_m (@MaxBlesch). This is based on the pension simulation code by (@Eric-Sommer).

• #184 Add visualization of the tax and transfer system as an interactive bokeh plot and documentation improvements (@tobiasraabe).

• #198 Enhance the loader of internal and user functions, adds a tutorial for how to pass functions to the interface and provides more tests (@tobiasraabe).

• #213 Change compute_taxes_and_transfers such that it always returns a pandas DataFrame and removes the return_dag option (@tobiasraabe).

• #219 Refactor the DAG and makes it independent from the main interface (@tobiasraabe). The PR also changes the names of interface arguments: functions instead of user_functions, set_up_policy_environment instead of get_policy_for_date, columns_overriding_functions instead of user_columns and some more changes.

• #225 Make gettsim ready for Python 3.8 (@tobiasraabe).

v0.3.4 — 2020-07-30

• #222 Fix wohngeld coefficent. Add test for increasing wohngeld. (@hmgaudecker, @MaxBlesch)

v0.3.3 — 2020-06-27

• #212 Improve the error message when reduced series could not be expanded with an id variable and fixes a related error in the internal functions (@hmgaudecker, @tobiasraabe).

• #214 Add a check for missing root nodes (@tobiasraabe).

• #215 Add a check for duplicate targets (@tobiasraabe).

• #216 Fix calculation of kinderzuschlag and wohngeld. Changed check against arbeitsl_geld_2 (@tobiasraabe).

v0.3.2 — 2020-06-19

• #196 Add docstring to policy_for_date.py and improves its interface (@MaxBlesch).

• #197 Add all functions which build the tax and transfer system to the documentation (@tobiasraabe).

• #198 Enhance the loader of internal and user functions, adds a tutorial for how to pass functions to the interface and provides more tests (@tobiasraabe).

• #200 Add a debug mode to gettsim and documents the feature (@tobiasraabe).

• #201 Improve the calculation of hh_freib and renames it to alleinerziehend_freib (@MaxBlesch, @tobiasraabe).

• #202 Fix bugs that surfaced for negative incomes (@MaxBlesch). related transfers, calculating them at the appropriate (household) level

• #206 Fix several bugs in arbeitsl_geld_2 and (@MaxBlesch).

v0.3.1 — 2020-06-05

• #188 Removes misleading code bits from the documentation and adds a copy-button (@tobiasraabe).

• #191 Adds a skip and a warning if gettsim.test() is repeatedly called (@tobiasraabe).

v0.3.0 — 2020-06-04

• Cleanup of ALG II parameters and documentation (@mjbloemer)

• Break up params.yaml into group-level files (@MaxBlesch)

• Correct income deductions for additional child benefit (@Eric-Sommer)

• Implement “Starke-Familien-Gesetz” from July 2019 on child benefits (@Eric-Sommer)

• Remove child specific ALG II withdrawal and refactoring of ALG II (@MaxBlesch, @mjbloemer)

• Add ALG II transfer withdrawal 2005-01-01 to 2005-09-30 (@mjbloemer, @MaxBlesch)

• Child tax allowance modelled as two separate items. (@Eric-Sommer)

• Alimony advance payment (Unterhaltsvorschuss) now modelled more in line with the law (@Eric-Sommer)

• Implement Art. 3 of Familienentlastungsgesetz on income tax tariff and child tax allowance becoming effective in 2020 (@Eric-Sommer)

• Implement parity in health care contributions since 2019 and 2020 contribution rates (@Eric-Sommer)

• Add Elterngeld calculation (@MaxBlesch, @boryana-ilieva)

• Fix Soli 1991 calculation, improve Soli 1995 calculation, add 2021 Soli parameters and add Soli tests (@mjbloemer, @MaxBlesch)

• Implement pre-2010 ruling on Vorsorgeaufwendungen (@Eric-Sommer)

• gettsim is released as a conda noarch package (@tobiasraabe)

• Implement 2020 reform increasing housing benefit (Wohngeldstärkungsgesetz) and complete parameters on past benefits (@Eric-Sommer)

• Regroup wohngeld parameters according to GEP-3 (@MaxBlesch)

• Rename all data columns to German names (@amageh, @MaxBlesch)

• Rename and regroup all param files (@Eric-Sommer, @MaxBlesch)

• Add generic/piecewise functions (@johannesgoldbeck, @ppoepperling, @MaxBlesch)

• A series of pull requests establishes the new DAG-based backend and refactors the calculation of benefits, taxes, and social insurance (@MaxBlesch, @tobiasraabe)

• Error messages for the new interface (@hmgaudecker, @tobiasraabe).

v0.2.1 — 2019-11-20

• Fix error with real SOEP data and “Wohngeld” for households with more than 12 household members (@Eric-Sommer, @MaxBlesch)

• Better description of required input and output columns (@MaxBlesch, @Eric-Sommer)

• Fix dependencies for conda package (@tobiasraabe)

• Fill changelog and include in docs (@tobiasraabe, @hmgaudecker)

• Add maintenance section to website (@tobiasraabe)

v0.2.0 — 2019-11-06

Initial release of gettsim.

• Set up as a conda-installable package (@tobiasraabe)

• Migration of the parameter database from xls to yaml (@mjbloemer, @MaxBlesch)

• Migration of test parameters from xls to csv (@MaxBlesch, @tobiasraabe)

• Get the main entry point to work, change interface (@MaxBlesch, @janosg, @Eric-Sommer, @hmgaudecker, @tobiasraabe)

• Tax and transfer module uses apply instead of loops (@MaxBlesch, @hmgaudecker)

• Correct tax treatment of child care costs (@Eric-Sommer)

• Improve calculation of housing allowance (@Eric-Sommer)

v0.1 and prior work — 2019-09-30

Most code written by @Eric-Sommer based on IZAΨMOD, a policy microsimulation model developed at IZA.