US-first calculators, UK/EU presets, and a practical way to adapt numbers without guessing.
This is a fee-modeling guide. JunctionKit tools help you structure costs (referral %, payment processing, fulfillment, listing fees). They are not official rate cards for every country, and they are not tax or legal advice.
Most individual calculators (Etsy, Amazon, Shopify, etc.) use simplified US 2026 models so the math stays clear. The Fee Comparator 2.0 adds US / UK / EU-style presets for a fast cross-channel view. When your local rate differs, you replace the percentage — the structure still holds.
Exact numbers change by category and plan. Patterns sellers run into:
| Area | What often changes outside the US |
|---|---|
| Referral / final-value fees | Same idea, different % by marketplace and category |
| Payment processing | Card and PayPal-style rates vary by country and merchant tier |
| Fulfillment (FBA / FBT) | Local weight and size tiers; not the same dollar amounts as US |
| VAT / sales tax | Often collected or displayed differently — not the same as “selling fees” |
| Listing & ads | Promoted listings, offsite ads, and listing renewals follow local rules |
Use the table as a checklist when you open each platform’s help center — not as a substitute for it.
| Goal | Start here |
|---|---|
| Compare channels quickly | Fee Comparator 2.0 (region preset) |
| Single-platform profit | Etsy, Amazon FBA, eBay, Shopify, TikTok, Poshmark |
| Payments only | PayPal fee calculator |
| Import / shipping stack | Landed cost calculator |
| How many units to break even | Break-even calculator |
| Print-on-demand / digital | POD profit, Digital product fees |
Platforms update fees by category, promotion, and region. Hard-coding dozens of official schedules into every calculator would go out of date fast and could mislead people who trust a number that no longer matches Seller Central.
Our approach: clear structure + simplified presets + explicit “confirm on the platform.” That is less flashy than “official rates for 40 countries,” and more honest.
Most fee tools use simplified US 2026 models. The Fee Comparator includes US, UK, and EU-style presets for a quick side-by-side view. Always confirm final percentages in each platform’s local seller help center.
Open the Fee Comparator and choose the UK preset, then open the matching platform calculator (Etsy, Amazon, eBay, etc.) and adjust any rates that differ from your Seller Hub.
No. This page is about marketplace and payment fee modeling only. VAT, sales tax, and import duties are separate and depend on your situation.
Platforms change fees by category, plan, and country often. Maintaining full official rate cards on every tool would go stale quickly. Presets plus “confirm on platform” stays accurate longer.
Fee Comparator 2.0 (region preset), then Etsy, Amazon, eBay, Shopify, and PayPal calculators — treat the numbers as a starting structure and swap in your local rates.