The mapTax authorityTaxpayer Services
Guidance, enquiries & assistants
partly covered · 12 open projects
Public guidance, rulings, contact centres, virtual assistants, answers to taxpayer questions.
The honest read
Community tools answer questions from official guidance in France, the UK and the US, an Australian guidance dataset is structured for agents, HMRC's take-home pay library and the IRS's withholding estimator, EITC assistant and the form builder behind them are open, and the UK Online Trade Tariff, a guidance service run by an authority, is public with its API and its Advance Tariff Rulings service. A guidance service for direct taxes run by an authority: none in the list.
A draft: not yet reviewed by a tax specialist.
Start with
An authority's own calculation library, and official French guidance as a dataset an agent can cite.
Its 12 projects
| Project | Kind | Jurisdiction | Last update | Stars |
|---|---|---|---|---|
| tax-kalculatorKotlin Multiplatform library that works out UK take-home pay after tax, National Insurance, pension and loans. | APIs | UK | Jun 2026 | 17 |
| BOFiP datasetThe French tax authority's official guidance (BOFiP), as a dataset for language models. | Legal datasets | FR | — | — |
| ATO Australian Tax Law DatasetAustralian Taxation Office rulings and guidance, structured for AI use. | Legal datasets | AU | — | — |
| DouaneXtractSelf-hosted full-text search over 3,007 Tunisian customs documents: rulings, letters, WCO decisions.Licence unknown | Automations | TN | Apr 2026 | — |
| HMRC Advance Tariff Rulings serviceHMRC's Advance Tariff Rulings service: application frontend, case backend, rulings search, case manager. | APIs | UK | Aug 2026 | — |
| IRS EITC AssistantThe IRS Earned Income Tax Credit Assistant questionnaire, built on Fact Graph and Form Builder. | Calculators | US | Aug 2026 | — |
| IRS Form BuilderScala library that turns flow XML, fact dictionaries and locale files into questionnaire sites on Fact Graph. | Tax engines | US | Oct 2026 | — |
| IRS Tax Withholding EstimatorThe IRS Tax Withholding Estimator, built on Fact Graph and Form Builder. | Calculators | US | Aug 2026 | 85 |
| PolicyEngine ChatChat interface to PolicyEngine for UK and US tax and benefit questions and reforms.Licence unknown | Automations | US · UK | Jan 2026 | — |
| PolicyEngine UK ChatChat assistant for UK tax and benefit policy, powered by PolicyEngine.Licence unknown | Automations | UK | Sep 2026 | — |
| TaMaTo (Tariff Management Tool)The Department for Business and Trade's Tariff Management Tool for UK import and export tariff data; a copy. | Automations | UK | Sep 2026 | — |
| UK Online Trade TariffThe UK Online Trade Tariff: API, website, admin tool and electronic tariff file for codes, duties and quotas. | APIs | UK | Oct 2026 | 11 |
Every project here is maintained and serves a tax authority. See the team's projects in the list.
On Learn
- Read official guidance as dataHow-to guide
- DatasetGlossary term