The Anrok integration automatically calculates sales tax, VAT (value-added tax), and GST (goods and services tax) on your invoices and displays the result to your customers. For each invoice issued with Anrok tax, Turnstile records the transaction in your Anrok account, so Anrok remains your system of record for tax liability, filing, and remittance

Turnstile does not determine where you owe tax and does not remit taxes. Nexus decisions, tax registrations, exemption certificates, filing, and remittance are all managed in your Anrok account.

Before you connect, you need:

To connect Anrok to Turnstile:

Turnstile then verifies the key with Anrok, syncs your Anrok tax categories, and adds a link to your Anrok dashboard.

If the connection fails, check that you pasted the full key, or generate a new key in Anrok, then retry from the same page.

If Anrok cannot be reached at the moment an invoice is issued, the If Anrok is unavailable setting on the Anrok integration page controls what happens. There are two options:

If an invoice is ever issued without Anrok tax, the Anrok integration page shows a banner reading An invoice was issued without Anrok tax with a link to the affected invoice.

Anrok determines how each product is taxed in each jurisdiction based on the product's tax category. Once Anrok is connected to Turnstile, you can assign a tax category when you create a product in Turnstile in either of these places:

Each product can have one tax category. Products created in other workflows, such as directly on a quote, do not have a tax category yet. Turnstile checks for missing tax categories before an invoice is issued and shows you how to fix them. For details, see the Resolve tax alerts before issuing section of this article.

To assign an Anrok tax category to a Turnstile product:

A product's tax category is registered with Anrok when the product is saved in Turnstile and cannot be changed afterward. To use a different tax category:

1. Create a new product with a different name and assign the correct tax category.

2. Update your plans and draft quotes/subscriptions to use the new product.

3. Archive the original product to remove it from your catalog.

Archiving a product does not affect plans, quotes, subscriptions, or invoices that already use it. Existing subscriptions and signed quotes continue to be taxed under the original tax category.

Turnstile calculates tax through Anrok once, at the moment an invoice is issued. The calculation is based on the customer's billing address, each product's tax category, and the invoice date.

Before issuance, the invoice's tax line shows Calculated at issuance, and the invoice total includes only pre-tax charges.

When the invoice is issued:

The same tax line appears on the invoice page, the invoice PDF, and the invoice email. Per-jurisdiction detail is available in your Anrok account.

If your customer accepts a quote through a checkout page with payment, Turnstile shows an estimated tax based on the billing address the customer enters at checkout. The amount the customer actually pays is the amount recorded in Anrok once payment completes. If Anrok cannot calculate tax while the customer is checking out, the customer cannot complete payment until the calculation succeeds.

While Anrok is connected, Turnstile validates every invoice before it is issued, whether you issue manually or use automatic issuance. Two problems block issuance:

To fix a missing tax category:

The tax category is saved on the product itself, so it applies to all uses of that product. Once every product on the invoice has a tax category, the invoice can be issued.

If your customer's billing address is in the European Union or the United Kingdom and Anrok determines that reverse charge applies, the customer is responsible for reporting VAT (value-added tax) to their tax authority, and you do not collect it. On these invoices:

While tax IDs are optional fields and a missing tax ID does not block an invoice from issuing, a compliant reverse charge invoice includes both your VAT number and your customer's VAT number.

Issued invoices cannot be edited. To correct one, void it and issue a replacement. For steps, see our void and reissue article.

When you void an invoice that has Anrok tax, the confirmation dialog shows a Sales tax update warning, and the tax transaction is also voided in your Anrok account. If the original transaction is already part of a filed return, Turnstile records an offsetting transaction in Anrok instead.

Before you issue the replacement invoice, you can correct the customer's billing details and Tax IDs, and assign tax categories to any products that are missing one. The replacement invoice gets a fresh tax calculation, and a new transaction is recorded in Anrok when it is issued.

After you disconnect, tax is no longer calculated or applied to your invoices automatically. Your Anrok settings are saved and restored if you reconnect later.

No. While you can continue to use Stripe for online payment collection, Anrok cannot be enabled while a connected Stripe account has Stripe tax calculation enabled. Using both would report tax twice. To switch to Anrok, first turn off Stripe tax calculation from Settings > Integrations > Stripe > Enable Stripe tax calculation.

Tax is calculated once, when the invoice is issued. Draft invoices show "Calculated at issuance" on the tax line, and quotes do not include calculated tax. The exception is a quote accepted through a checkout page with payment, where the customer sees an estimate based on the billing address they enter at checkout.

No. The tax transaction is recorded in Anrok when the invoice is issued. Payment does not change the recorded tax, so no update is needed when your customer pays.

Manage exemption certificates in your Anrok account. When Anrok applies an exemption, the invoice issued in Turnstile reflects it automatically. There is no exemption setup in Turnstile.