Overview

Amazon sellers who process refunds through Seller Central may encounter Error 18012 when attempting to issue partial refunds that involve tax or shipping tax components. This error occurs when the refund amount requested for a tax-related portion of an order exceeds the allowable balance, or when sellers attempt to refund only a tax component without including the corresponding base amount. Understanding how this error works is essential for sellers who regularly handle refunds and want to avoid processing delays.

Key Points / What Sellers Need to Know

• Error trigger — Error 18012 fires when the refund amount you request for the tax or shipping tax portion of an order is higher than the remaining refundable balance for that component.
• Tax-only refunds may be blocked — If your account is not eligible for tax-only refunds, you cannot refund the tax portion of an order without also refunding the corresponding item price or shipping fee.
• Running balances matter — Each component of an order (item price, shipping, item tax, shipping tax) has its own refundable balance that decreases with each partial refund you issue.
• Partial refund history is cumulative — Previous refunds applied to a specific component reduce the amount available for future refunds on that same component.

How the Error Occurs

Every order in Seller Central is broken down into individual components: item price, shipping fee, item price tax, and shipping tax. Each of these components has its own refundable balance, which starts at the amount the customer originally paid. When you issue a partial refund, the balance for the affected component decreases accordingly. Error 18012 appears when you try to refund more than the current remaining balance for any tax or shipping tax component, or when you submit a refund that includes only a tax component without the associated base charge on accounts that are not eligible for standalone tax refunds.

For example, if a customer paid $2.00 in shipping tax and you previously refunded $1.50 of that amount, the remaining shipping tax balance is only $0.50. Any future refund request for shipping tax on that order cannot exceed $0.50. Similarly, if a customer paid $10.00 for an item and $2.00 in item tax, sellers who are not tax-refund-eligible must include the $10.00 item price refund in order to also refund the $2.00 tax — they cannot refund the tax in isolation.