Invoice-adjusted Amazon Ads check

What is your real KDP ads ACOS after VAT or GST?

Add invoice tax and regulatory fees to campaign spend, then compare the true cost with your KDP royalty margin.

Last reviewed: 19 August 2026

Uses your invoice rate No account connection Free, no signup

Enter the actual percentages from your Amazon Ads invoice. Tax treatment varies by advertiser.

Invoice-adjusted profitability
MetricResultMeaning
Console ACOSCampaign spend ÷ attributed sales
Total amount paidSpend + regulatory fee + tax
Effective ACOSTotal amount paid ÷ attributed sales
Break-even ACOSRoyalty per sale ÷ list price
Net ad contributionEstimated royalties − total amount paid

Why tax changes the break-even calculation

Amazon says advertising fees can be subject to VAT or GST for electronically supplied services. Its sponsored ads terms also state that advertising fees are exclusive of applicable taxes. If the Ads Console shows $100 of campaign spend but your invoice adds 20% VAT, you paid $120. Your effective ACOS is therefore higher than the campaign-only ACOS.

Use the invoice, not a guessed country rate. A valid VAT/GST registration number can change whether tax is collected, and some countries collect it even when an ID is supplied.

How to check a KDP ads invoice

01

Match the period

Use campaign spend and attributed sales from the same reporting period.

02

Read the invoice

Enter the VAT/GST and any regulatory advertising fee actually charged.

03

Compare margins

Effective ACOS must stay below your royalty-based break-even ACOS for direct ad sales to contribute profit.

Worked examples: the same campaign, different invoice tax

Assume Amazon Ads Console reports $100 spend and $250 attributed sales, with no regulatory fee. Console ACOS is 40% in both cases.

Invoice taxTotal paidEffective ACOS
10% GST$11044%
20% VAT$12048%

These examples explain the calculation only. The rate and charges on your actual Amazon Ads invoice control your result.

Frequently asked questions

Does Amazon charge VAT or GST on ads?
It may, depending on your billing country, tax registration and local rules for electronically supplied services.

Why is effective ACOS higher than Console ACOS?
Console ACOS can exclude invoice-level taxes and fees. Effective ACOS uses the total amount you actually pay.

Should I include VAT if I can reclaim it?
For cash-flow planning, calculate the invoice amount first. If the tax is recoverable, run a second scenario with a 0% tax rate and confirm treatment with your accountant.

Does this replace my invoice?
No. It is an estimate; your Amazon Ads invoice and local tax rules are authoritative.

Official Amazon sources and related tools

Amazon Ads — VAT/GST on electronically supplied services

Amazon Ads — regulatory advertising fees

KDP Ads Break-Even Calculator — include TACOS, organic sales and KENP income.

KDP Ads Budget Calculator — estimate clicks, maximum CPC and test spend.

Estimates only. Verify every charge against your Amazon Ads invoice. This tool is not tax or financial advice.