# Contributing [#contributing] Use this section when you want to propose a tax behaviour change and prepare a pull request with source evidence, tests and release-impact notes. ## Start with your intent [#start-with-your-intent] * [What are you changing?](/contributing/what-are-you-changing) routes common contribution intentions to the right guide. * [Fix an incorrect result](/contributing/fix-an-incorrect-result) explains how to reproduce and correct a calculation issue. * [PR evidence checklist](/contributing/pr-evidence-checklist) lists the evidence your pull request must include. ## Contribution flow [#contribution-flow] ## Contribution guides [#contribution-guides] * [Add a fact](/contributing/add-a-fact) * [Add a rule](/contributing/add-a-rule) * [Add a calculator](/contributing/add-a-calculator) * [Add a tax year](/contributing/add-a-tax-year) ## Standards [#standards] * [Testing standards](/contributing/testing-standards) * [Source citation standards](/contributing/source-citation-standards) * [Naming and schema standards](/contributing/naming-and-schema-standards) * [Effect service standards](/contributing/effect-service-standards) * [Backward compatibility](/contributing/backward-compatibility) * [Changesets](/contributing/changesets) * [Review expectations](/contributing/review-expectations) ## Related sections [#related-sections] * [Concepts](/concepts) * [Guides](/guides) * [Reference](/reference) * [Package ownership](https://github.com/crcorbett/taxkit/blob/a151e51e8a30247526fa93412df046955846eca4/docs/architecture/package-ownership.md)