Question 1

How to add custom tax rules for US states with commerceguys/tax?

Accepted Answer

Create custom tax type and rate resolvers by implementing the provided interfaces, similar to the included EU and Canada examples. Define zones for each state, add tax types with rates, and integrate them into the resolver chain for automatic application.

Question 2

commerceguys/tax or Avalara for PHP tax calculations?

Accepted Answer

commerceguys/tax is a self-hosted, open-source library ideal for control and customization, while Avalara is a SaaS with automated updates but higher cost and less flexibility. Choose based on your budget, need for real-time updates, and development resources.

Question 3

Does commerceguys/tax handle tax exemptions for nonprofits?

Accepted Answer

Yes, but it requires custom resolver logic. You can modify the context or taxable object to include exemption certificates and adjust rates accordingly, implementing rules like tax holidays or zero-rating for specific organizations.

Question 4

How to integrate commerceguys/tax with Laravel?

Accepted Answer

Use Laravel's service container to register the tax resolver and repositories as services. Create a service provider to bind classes and inject dependencies, adapting the verbose example from the README to Laravel's dependency injection system.

Question 5

What's the performance impact of multiple tax resolvers?

Accepted Answer

Resolvers are invoked in priority order until one returns a result, so performance depends on the number and complexity of resolvers. For high-traffic sites, cache resolved rates or optimize resolver logic to reduce overhead.

Question 6

Can commerceguys/tax automatically update tax rates from government sources?

Accepted Answer

No, the library lacks automatic updates; you must manually update tax rate amounts in your database. Consider scheduling cron jobs to fetch new rates from sources like the EU's VAT rates document linked in the README.

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