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Informations about the package opensalestax-for-woocommerce

OpenSalesTax for WooCommerce

Replace TaxJar / Avalara / WooCommerce Tax with self-hosted OpenSalesTax. Free, open-source, US sales-tax calculation at WooCommerce checkout.

Status: v0.4.1. Tested against WordPress 6.6+ / WooCommerce 10.7 / OpenSalesTax engine v0.39. 109 unit tests + an end-to-end integration test on a real WP+WooCom Proxmox VM.

What this saves you

Most WooCommerce tax plugins are paid services or limited free tiers:

Service Pricing model
WooCommerce Tax (Jetpack) Free up to 200 transactions/mo; paid tier above
TaxJar from $19/mo + transaction fees
Avalara AvaTax enterprise pricing
OpenSalesTax + this plugin $0 software cost, self-hosted

You run a small VM (or container) for the OpenSalesTax engine; this plugin calls into it from WC's checkout flow. Tax math runs locally on infrastructure you own.

Install

Activate via WP Admin → Plugins.

Or via Composer:

The SDK (ejosterberg/opensalestax) and the plugin (ejosterberg/opensalestax-for-woocommerce) are both on Packagist.

For the full step-by-step walkthrough including engine setup, configuration, and verification, see docs/INSTALL.md.

Configure

  1. Stand up an OpenSalesTax engine (5-minute Docker quickstart)
  2. In WP Admin: WooCommerce → Settings → Tax → OpenSalesTax
  3. Enter your engine's base URL (e.g. http://your-engine:8080)
  4. (Optional) Enter API key if your engine has authentication enabled
  5. Click Test Connection — should report status: ok with the engine version

Done. The next cart that includes a US shipping address gets destination-based sales tax.

How it works

The plugin hooks WooCommerce's woocommerce_calc_tax filter. On every line that needs tax computed:

  1. Read the customer's shipping ZIP from WC()->customer
  2. Resolve the line's tax category (WC tax class → OpenSalesTax category)
  3. Skip if customer is tax-exempt (WC()->customer->is_vat_exempt())
  4. Look up cached tax for (zip, category, line-amount) — return early on hit
  5. On cache miss, call POST /v1/calculate on your OpenSalesTax engine
  6. Return the calculated tax amount in WC's expected format

Tax breakdown (per-state, per-county, per-city, per-district) is computed and returned by the engine. The combined total flows into WC's tax line; per-jurisdiction detail can be inspected via wp opensalestax calc <zip> <amount>.

Design choices

Compatibility

Compatible with classic checkout AND Cart/Checkout Blocks (Blocks invoke the same woocommerce_calc_tax filter via the Store API).

HPOS-compatible: this plugin doesn't post-process orders in v0.1, so the HPOS tax-reading caveat doesn't apply.

What's shipping

What's coming next

Out of scope

Disclaimer

Tax calculations are provided as-is for convenience. The merchant is solely responsible for tax-collection accuracy and remittance to the appropriate jurisdictions. Verify against your state Department of Revenue before remitting.

Quality bar

Contributing

DCO sign-off (git commit -s) required on every commit. See CONTRIBUTING.md.

License

Dual-licensed: Apache-2.0 OR GPL-2.0-or-later — recipient picks. See LICENSE-APACHE.txt, and LICENSE-GPL.txt. The GPL-2.0-or-later option exists primarily for WordPress.org plugin directory compatibility; most merchants embedding the plugin in their own WooCommerce deployment will be served by the Apache-2.0 option.

All versions of opensalestax-for-woocommerce with dependencies

PHP Build Version
Package Version
Requires php Version >=8.2
ejosterberg/opensalestax Version ^0.3.0
Composer command for our command line client (download client) This client runs in each environment. You don't need a specific PHP version etc. The first 20 API calls are free. Standard composer command

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