Short answer
Make sure Stripe has a usable location for the customer before you confirm. Stripe looks at the customer’s shipping address, then their billing address, then the payment method’s billing details, then their IP address. In the United States the postal code is the minimum, Canada needs the postal code or province, and other countries need the country code. If the address is there but Stripe reports customer_tax_location_invalid instead, check its format.
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Why Stripe can’t calculate the tax, and the fix
01
No usable customer location
“you must provide enough location information to accurately determine tax rates for the customer to confirm the PaymentIntent and collect taxes.” Stripe, Error codes (payment_intent_automatic_tax_incomplete)
With automatic tax on, Stripe needs to know where the customer is before it can confirm the payment. Stripe’s docs say it takes the location from the customer’s shipping address, then their billing address, then the payment method’s billing details, then their IP address. Check that one of these has enough detail before you confirm.
02
The address is too thin for the country
“We require your customer’s postal code at a minimum. We recommend providing a full address for the most accurate tax calculation result.” Stripe, Calculate tax in a custom payment flow (United States)
The fields Stripe needs vary by country. For US customers the postal code is the minimum, and Stripe recommends a full address for the most accurate result.
03
The address arrives too late
Also check: the checkout flow collects the address before the PaymentIntent is confirmed. This is an inference from the error wording, not a Stripe statement.
Checked against the vendor’s docs on : Stripe docs: Error codes; Stripe docs: Collect customer addresses; Stripe docs: Calculate tax in a custom payment flow (address requirements by country).
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Related: Stripe customer tax location invalid · Stripe stripe_tax_inactive · Stripe tax_id_invalid · Stripe payment_intent_mandate_invalid