TaxJs is a typescript and javascript library to calculate german tax.
The code is generated from pseudo code from https://www.bmf-steuerrechner.de/
Test page: https://taxcalcs.github.io/taxjs-test/
let tax = new Lohnsteuer2021Big();
tax.initInputs();
tax.setLZZ(2); // Lohnzahlungszeitraum
tax.setKVZ(1.3); // Einkommensbezogener Zusatzbeitragssatz
tax.setSTKL(1); // Steuerklasse
tax.setPVZ(1); // Zuschlag soziale Pflegeversicherung
tax.setRE4(new Big(1234500)); // Steuerpflichtiger Arbeitslohn in Cent
tax.calculate();
tax.getLSTLZZ().toNumber(); // Lohnsteuer in Cent
You can find all fields on the test page.
As replacement for the Java BigDecimal class the library big.js and the typescript definition @types/big.js are used.
For convert xslt file into xslt sef file you have to install xslt3.
npm install -g xslt3
and
npm run compile-xsl
For compile typscript into javascript you have to install typescript.
npm install -g typescript
- Download the new XML file from https://www.bmf-steuerrechner.de/ and save it to
build/unpacked/
.- Attention: Files should end with Big after the filename, so
Lohnsteuer2024.xml
should be saved asLohnsteuer2024Big.xml
, otherwise there may be additional problems during the build, e.g. there will be no minified file generated for them. This is a problem with the implementation incompress.js
.
- Attention: Files should end with Big after the filename, so
- Run
npm run build
.- Note: If you encounter errors in the .ts files, run
npm run build:ts
separately, fix the errors in the .ts file and then execute the rest of the build commands (npm run build:declaration && npm run build:native && npm run build:system && npm run build:umd && npm run build:es2015 && npm run build:compress
).
- Note: If you encounter errors in the .ts files, run
- Add all new files to source control and commit.
- Update the version. First update in a year increases the major version field to that year (e.g. first new psuedo code for 2024 means that the version would be 2024.0.0), additional pseudo code updates in the same yaar increase the minor version field, patches/bugfixes normally increase the patch version.