v1.1

Highlights: January 2026 policy environment and support for Python 3.14. Many bug fixes.

v1.1 — 2026-01-12

• #1124 Fix KiZ phase-out. (@MImmesberger)

• #1122 Implement Aktivrente. (@MImmesberger)

• #1123 Consistently use time unit converters offered by TTSIM. (@MImmesberger)

• #1121 Do not accidentally skip test_top_level_elements_not_repeated_in_paths, add mechanism for running tests selectively on CI. (@hmgaudecker)

• #1111 Parameter update Sozialversicherungsrechengrößen Verordnung 2026 and mean Zusatzbeitrag 2026. (@MImmesberger)

• #1112 Implement Mindestlohnanpassungsverordnung 2025. (@MImmesberger)

• #1113 Vorsorgepauschale Reform 2026. (@MImmesberger)

• #1110 Add Python 3.14 support. (@hmgaudecker)

• #1105 Reduce tolerance of statutory retirement age tests. (@MImmesberger)

• #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)

• #1092 Fix a couple of vectorization strategies. (@hmgaudecker)

• #1088 Fix typos in docs and param yamls. (@MImmesberger)

v1.0

The 1.0 version and the long list of contributions and contributors say it all. This is a completely re-vamped package waiting for helping many researchers!

• #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` (@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).

• ...

v1.0a2

What's Changed

• Rename Arbeitslosengeld 2 to Bürgergeld after 2022 by @MImmesberger in #1067
• Move to new plotting interface. by @MImmesberger in #1071

Full Changelog: v1.0a1...v1.0a2

v1.0a1

What's Changed

• Improve paths handling and fix a bug in paths by @hmgaudecker in #1064

Full Changelog: v1.0a...v1.0a1

v1.0a

This is a complete re-write; will publish more detailed notes on a proper release.

What's Changed

• Improve docs, fix deps by @hmgaudecker in #580
• refactor: add _y suffix to names of yearly variables by @lars-reimann in #581
• make sure arbeitsl_geld_2_eink_anr_frei_m uses the correct variable by @ChristianZimpelmann in #589
• feat: automatic conversion between different time units by @lars-reimann in #583
• Extend the access_different_date functionality for jahresanfang by @paulinaschroeder in #600
• Correct midijob_faktor_f by @paulinaschroeder in #602
• Implement reform of gesetzliche Pflegepflegeversicherung effective as of 2023-07-01 by @paulinaschroeder in #593
• fix wealth exemptions for Kinderzuschl by @ChristianZimpelmann in #591
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci[bot] in #586
• add anz_eig_kind_bis_24 to synthetic. by @ChristianZimpelmann in #603
• Fix heading level in notebook. by @hmgaudecker in #616
• fix: don't create functions for other time units if this leads to a cycle in the graph by @lars-reimann in #624
• Apply dates_active decorator on abgelt_st. by @hmgaudecker in #618
• Update micromamba in GHA by @hmgaudecker in #625
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci[bot] in #628
• Pin the dependencies of nbqa (black, ruff) to the same versions used on Python scripts. by @hmgaudecker in #631
• Apply dates_active decorator to midijob and ges_pflegev by @hmgaudecker in #623
• fix: don't use functions in compute_taxes_and_transfers that are not active by @lars-reimann in #638
• feat: infer columns_overriding_functions from functions and data by @lars-reimann in #639
• Fix piecewise_polynomial, fixes #629 by @nafetsk in #630
• Monthly precision in Zugangsfaktor by @TeBackh in #632
• Implementation pension for unemployed by @TeBackh in #634
• 568 bug alg2 by @TeBackh in #620
• remove todo Elterngeld by @ChristianZimpelmann in #646
• Fix child income deduction for Kinderzuschlag by @ChristianZimpelmann in #590
• introduce paramter for Unterhaltsvorschuss altersgrenze_mindesteinkommen by @ChristianZimpelmann in #650
• Tidy up function unterhaltsvors_m and fix bug by @ChristianZimpelmann in #652
• allow for up to 10 children in create_synthetic_data. by @ChristianZimpelmann in #649
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci[bot] in #648
• Midijobfaktor calculation in 2004 by @MImmesberger in #644
• Adding Soli to Lohnsteuer test cases by @JakobWegmann in #653
• Reduced contribution rate for retirees for long-term care insurance until 2004 by @MImmesberger in #637
• Correct calculation of Lohnsteuer for 2015 to 2023 by @JakobWegmann in #655
• Rounding of Taxes and Transfers by @MImmesberger in #659
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci[bot] in #657
• Replace hh in function names by bg/fg/vg by @lars-reimann in #662
• Entgeltpunkte Ost/West by @nafetsk in #660
• Vertrauensschutz in Rente für Arbeitslose by @TeBackh in #645
• Add groupings sn_id, fg_id, and bg_id by @lars-reimann in #601
• Add Erwerbsminderungsrente by @nafetsk in #577
• Add Erziehungsgeld by @nafetsk in #585
• Switch from vg to hh. by @MImmesberger in #675
• 2024 parameter changes by @Eric-Sommer in #680
• New issue option for yearly parameter update by @MImmesberger in #684
• Fix typo by @schra in #686
• Use max() instead of explicit if by @schra in #687
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci[bot] in #678
• Linking children's transfers to their parents. by @MImmesberger in #676
• minor fixes to doc by @MImmesberger in #695
• Data columns overwrite functions regardless of time unit by @lars-reimann in #700
• Remove tax unit groupings. by @MImmesberger in #694
• Fix time conversion after rounding by @lars-reimann in #715
• Combined decorator for policy information by @lars-reimann in #720
• Optionally skip vectorization of a policy function by @lars-reimann in #721
• Add argument to create_synthetic_data on whether adults are married. by @ChristianZimpelmann in #730
• Adjust wealth input to individual level. by @ChristianZimpelmann in #732
• Make sure GETTSIM runs over simple synthetic data by @ChristianZimpelmann in #729
• Make sure that eink_abhängig_beschäftigt_y is never negative. by @ChristianZimpelmann in #734
• Join columns to make target columns available at source level by @lars-reimann in #722
• fix: fall back to default value if foreign key of join_numpy is unresolved by @lars-reimann in #741
• Unterhaltsvorschuss calculation on child level. by @MImmesberger in #739
• Several small fixes related to groupings by @ChristianZimpelmann in #725
• Kindergeldübertrag by @MImmesberger in #751
• Allow array returns when skip_vectorization is being used, enforce import convention. by @hmgaudecker in #755
• Documentation of new groupings of individuals by @MImmesberger in #706
• Unify function names in Sozialversicherung modules. by @MImmesberger in #759
• Wohngeld on individual / BG level by @MImmesberger in #753
• Adjust statutory retirement ages by @MImmesberger in #717
• Allow for user provided grouping IDs. by @MImmesberger in #766
• KiZ only for BGs with parents. by @MImmesberger in #765
• Add Betreuungskosten pointer to synthetic data. by @MImmesberger in #769
• Regelbedarf on individual level by @MImmesberger in #771
• Add Mindesteinkommen to Wohngeld and calculate number of children below 24. by @MImmesberger in #777
• Test whether DEFAULT_TARGETS can be computed with create_synthetic_data output by @MImmesberger in #785
• Remove eigenbedarf_gedeckt from Kindergeldübertrag by @MImmesberger in #786
• Add earnings test for pension benefits by @MImmesberger in #788
• Add unterhaltsvors implementation 2009 to 2016 by @mjbloemer in #790
• Update Elterngeld by @ThOrtmann in #756
• Model classes for policies by @lars-reimann in #787
• Update infrastructure by @timmens in #797
• Improve pixi setup by @timmens in #799
• Update GEP-03 for new reference style by @mjbloemer in #800
• Update eink_st parameters and rounding rules by @mjbloemer in #803
• Update KiZ params 2024-2026 by @mjbloemer in #811
• 2025 social security and pension parameters by @Eric-Sommer in #809
• Steuerfortentwicklungsgesetz 2024 by @Eric-Sommer in #807
• GEP 6 by @hmgaudecker in #471
• Namespaces by @hmgaudecker in https://github.com/ttsim-de...

v0.7.0

• Several improvements to tests (move from csv to yaml)
• Specification of time periods a function is active (via @dates_active)
• Add Jax backend and NumPy broadcasting
• Improved creation of synthetic data
• Some updates (Lohnsteuer, Kindesunterhalt) and bug fixes
• See CHANGES.md for detailed list of changes

v0.6.0

• Update to 2023 environment
• Many improvements, especially in pension domain
• Improvements of code quality
• See CHANGES.md for a full list of changes.
• Update packaging

v0.6.0-alpha.2

• Update to 2023 environment
• Many improvements, especially in pension domain
• Improvements of code quality
• See CHANGES.md for a full list of changes.
• Update packaging (relative to v0.6.0-alpha.1, fix contents of setup.cfg)

v0.6.0-alpha.1

• Update to 2023 environment
• Many improvements, especially in pension domain
• Improvements of code quality
• See CHANGES.md for a full list of changes.
• Update packaging

v0.5.1

Small fix removing non-ascii characters from file names.