The mapCompany tax departmentDirect & International Tax
Corporate income-tax compliance
partly covered · 11 open projects
Taxable income, national and subnational returns, elections, loss utilisation, estimated payments, the filing calendar, return-to-accounts reconciliation.
The honest read
One French corporate model, a US tax engine, filing tools for Norway, the UK and German holding companies, an Italian incentive calculator and withholding tools for Bangladesh, Israel and Tunisia exist. The frameworks to encode any country’s rules are mature; the corporate models are not written.
A draft: not yet reviewed by a tax specialist.
Start with
Both file a real corporate return today, one country each; the frameworks (Catala, OpenFisca) are where a new country's rules would go.
Its 11 projects
| Project | Kind | Jurisdiction | Last update | Stars |
|---|---|---|---|---|
| WencheFiles annual accounts, the shareholder register return and the tax return for Norwegian limited companies. | APIs | NO | Oct 2026 | 136 |
| ct600-filingCommand-line tool that files a CT600 corporation tax return with HMRC. | APIs | UK | Jun 2026 | — |
| bank_retenue_syncERPNext app for Tunisian withholding certificates: ingestion, reconciliation and issue from invoices. | Automations | TN | Oct 2026 | — |
| CatalaProgramming language for writing law as code, next to the legal text it implements. | Tax engines | Global · FR | Oct 2026 | 2.4k |
| israeli-tax-withholdingAgent skill with Israeli withholding-at-source rates, certificates and payment calculations. | Agent skills | IL | May 2026 | — |
| OpenFiscaRules-as-code framework: legislation written in Python, served as a web API. | Tax engines | FR · Global | — | — |
| OpenFisca France EntreprisesMicrosimulation of French firms' taxes and subsidies around the carbon tax, built on OpenFisca. | Tax engines | FR | Sep 2026 | — |
| OpenTax EngineDeterministic US federal and state tax engine for AI agents with proof trees for each result. | Tax engines | US | Sep 2026 | 157 |
| Transizione 5.0 CalculatorLibrary that calculates the Transizione 5.0 super-depreciation benefit for Italian SME AI investments. | Calculators | IT | May 2026 | — |
| UGtaxBuilds a journal, balance sheet and E-Bilanz XBRL from camt.053 bank exports for German holding UGs. | Automations | DE | Aug 2026 | — |
| Withholding-Tax-Rates-2026Single-file static calculator of Bangladesh withholding tax rates for 2026; README in Bengali.Licence unknown | Calculators | BD | Jul 2026 | — |
Every project here is maintained and serves a company tax department. See the team's projects in the list.
Processes of this team
- Corporate income tax return2 of 5 steps have an open project
- Pillar Two0 of 5 steps have an open project
On Learn
- File a UK corporation tax return from the command lineHow-to guide
- Rules as codeGlossary term
- Tax engineGlossary term
- XBRLGlossary term