- Short answer
- On US orders with estimated tax, Shopify charges the final tax later; no refund is due, but a higher tax the card can't cover leaves the order unpaid.
- Lower final tax
- Only the final amount is captured; the rest of the authorization is released.
- Higher final tax
- The authorization is voided and a new one is created for the final amount.
- Card can't cover higher tax
- Shopify emails the customer; the order shows as unpaid with a fulfillment hold.
- Customer's bank
- The hold might display up to 30 days after the authorization, even after capture.
Why did the tax change after checkout?
The timeline shows a line like Shopify's example: “Tax amount was updated from $22.00 USD to $20.00 USD.”
On stores that sell in the United States, checkout can list Estimated tax and only authorize the card for it. After checkout, Shopify calculates the final tax, lower or higher, and charges that. The order's timeline then shows:
- Authorized amount — authorized on the card at the estimated tax.
- Tax amount update — only if the final tax differs.
- Captured amount — what the customer was charged at the final tax.
None of the Shopify Tax help pages we read on October 28, 2026 lists which plans, states or payment methods trigger an estimate.
Do you need to refund or collect the difference?
No. Shopify's guide is direct:
In this case, there is no need to take action, such as issuing a refund.
If the estimate was too high, only the final amount is captured and the rest of the authorization is released. If it was too low, the authorization is voided and a new one is created for the final amount.
If the customer's payment method can't cover a higher final tax, Shopify emails them that the payment failed and prompts them to complete their purchase; your Orders page lists the order as unpaid with a fulfillment hold.
A change after an address edit is a separate recalculation: does Shopify recalculate tax when you change a shipping address?
What does your customer see?
Your customer's order status page shows Estimated tax until the tax is final; the final amount then appears in the order confirmation email or text.
Their bank statement may still show the authorization: the hold might display up to 30 days after it, even once the payment was captured.
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