How this calculator works
A partial refund should be transparent and traceable to the terms shown to the customer. Enter the item value and any permitted deductions to estimate the final amount. Laws and marketplace rules vary, so confirm that each deduction is allowed before issuing a refund.
The calculator first builds the refundable value from the item price and the exact refundable tax or original-shipping amounts you have selected. It then subtracts return shipping, a percentage-based restocking fee and any other disclosed deduction. Keeping each component separate creates a clearer customer-service record.
Formula used
- Refundable value = item price + sales tax when refunded + original shipping when refunded.
- Restocking fee amount = item price × restocking-fee percentage.
- Customer refund = refundable value − return shipping deduction − restocking fee − other deduction, with a minimum of zero.
Worked example
For a $120 item with $9 tax, a 10% restocking fee and $8 return shipping, the estimated refund is $109 when tax is refunded and original shipping is excluded.
- $120 item + $9 refundable tax = $129 refundable value.
- $120 × 10% = $12 restocking-fee amount.
- $129 − $8 return shipping − $12 restocking fee = $109 estimated customer refund.
How to interpret the result
Use the displayed breakdown when explaining the refund, but issue only deductions that were properly disclosed and are permitted for the order. A mathematically valid result is not automatically a legally or contractually valid refund.
When to use this calculator
- Explaining a proposed refund breakdown to customer support staff.
- Checking the arithmetic behind disclosed shipping or restocking deductions.
- Comparing several permitted resolution offers before issuing a refund.
When it is not enough
- Determining whether a deduction is lawful or contractually permitted.
- Replacing the calculation produced by a tax or payment system.
- Creating a fee that was not disclosed to the customer before purchase.
Assumptions behind the estimate
Results are useful only when these assumptions match the decision you are evaluating:
- Tax and original-shipping inputs match the exact refundable amounts for the transaction.
- Percentage fees apply to item price rather than tax or shipping.
- All entered deductions are permitted and supported by the seller's records.
Common calculation mistakes
- Confusing original delivery cost with the return-label deduction.
- Applying a restocking percentage to the entire order instead of the item value.
- Forgetting that payment platforms may calculate refundable tax separately.
Practical scenarios
Opened product
Use a permitted restocking percentage and return-label deduction while keeping tax treatment aligned with the actual payment-platform refund.
Customer keeps damaged item
Enter the agreed deduction or discount without return shipping when no label will be issued, then review the final customer amount.
Multi-item order
Calculate the affected item separately so unrelated products, shipping allocations and taxes do not distort the refund.
How to get a more reliable estimate
- Enter the refundable tax amount produced by the payment or tax system rather than estimating it.
- Keep original shipping separate from the cost of the return label.
- Record a clear reason and source for every fixed deduction.
The output is an educational planning estimate. It does not override consumer law, tax treatment, warranties, payment-provider rules or marketplace policies.
Formula logic is documented on our methodology page. Examples are independently hand-checked against the displayed formula. No carrier, marketplace or software company sponsors these calculations.
Last reviewed: August 17, 2026