Buyer decision guide
A UK Etsy or Amazon seller can model one product, see the marketplace fees and UK VAT-on-fees line separately, and compare the same sale before and after VAT registration using editable assumptions. They move from a rough margin spreadsheet to a reviewable, client-side pricing model they can check against their Etsy Payment account, Amazon Seller Central fee schedule, GOV.UK VAT rates and their accountant's advice.
What this guide inspected
This page is built from the reviewed public offer, the live product route, the free diagnostic route, checkout readiness, and the paid bundle component list.
Decision matrix
Use this when the issue is low-risk and you have time to read primary sources, build your own checklist, and keep evidence yourself.
Best first move when you need a fast private screening result before buying anything.
Best fit when the problem is recurring, evidence-heavy, and specific enough that a buy-once workflow is cheaper than rebuilding from scratch.
Use this for legal, tax, medical, employment, accessibility, compliance, regulated, disputed or high-value cases where judgement matters.
Bundle evidence
Reviewed product
The paid product is for buyers who want the structured workflow and evidence pack, not just another article.
Included component
Shows VAT charged on marketplace seller fees as its own line, treating it as a cost for non-registered sellers and as potentially reclaimable input VAT for VAT-registered sellers.
Included component
Runs the same sale as not VAT-registered and VAT-registered, separating output VAT, fee VAT and profit change so the seller can review pricing before crossing the threshold.
Included component
Uses the rates and costs entered by the seller to model a break-even item price and a target-margin price.
Included component
Gives the seller a reviewable fee breakdown and a plain-English explanation of the model for accountant review.
Included component
Default Etsy, Amazon and VAT assumptions are labelled as last checked in June 2026 and can be edited to match the seller's own fee statements.
Next step
If the free result shows a real gap, continue to the product page and read the scope, limits, refund terms and checkout details before buying.