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Tech riderRev. 4 Oct 2026

OpenSalesTax

Ch 245.4of 28 Tax Engine Software
  1. 1Runs onAPI, self-hosted
  2. 2CostsFree plan
  3. 3Tax typessales tax
  4. 4API accessYes
4 lines stated Written from the maker's own pages: github.com
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Overview

OpenSalesTax is ranked #24 of 28 in tax engine software on Specifiction. It runs on API, Self-hosted. There is a free plan.

OpenSalesTax plans and pricing

All plans
Free / open source Free Apache 2.0 · self-hostable · US sales tax calculation API github.com · 4 Oct 2026

Compared on tax engine software

Free plan
Yesgithub.com
Tax types
sales_taxgithub.com
API access
Yesgithub.com

Facts

Purpose
OpenSalesTax calculates how much sales tax to charge on US transactions using public data and per-state modules.github.com · 4 Oct 2026
Coverage
The project says it has modules for 52 jurisdictions, with all 48 sales-taxing jurisdictions loaded into each published data dump.github.com · 4 Oct 2026
Calculations
The API calculates tax for line items and can return a breakdown by state, county, city, or district jurisdiction.github.com · 4 Oct 2026
Item categories
Documented categories include general, clothing, groceries, prescription drugs, prepared food, and digital goods.github.com · 4 Oct 2026
Data sources
The project uses Streamlined Sales Tax files and state Department of Revenue publications, and says it does not ingest paid tax data feeds.github.com · 4 Oct 2026
Hosting
The engine can be installed from source or run with Docker and requires PostgreSQL by default; MariaDB support is available as an optional extra.github.com · 4 Oct 2026
Data refresh
Release data dumps are pinned to the SST quarterly file current at release time, and the project documents fetching and loading newer source data.github.com · 4 Oct 2026
Limitations
The project identifies incomplete sub-state tax stacking for Colorado home-rule cities and Louisiana parish-level collectors.github.com · 4 Oct 2026
Docker limitation
The README says the runtime image lacks the psql client, so data restore fails in the container unless the package is added or the source-install path is used.github.com · 4 Oct 2026
Advice disclaimer
The project says its calculations are not legal or tax advice and advises verifying results with the relevant state Department of Revenue before remitting.github.com · 4 Oct 2026
Support and community
The project invites users to report incorrect rates or adopt a state, and directs contributors to its GitHub contributing guide.github.com · 4 Oct 2026
Adoption status
The public users registry says there are no listed self-hosters or integrators yet and that OpenSalesTax is pre-1.0.github.com · 4 Oct 2026

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Sources