Reference

Seller cost playbooks

Each page starts from a real seller problem, states what changed and when, and hands you a calculator that uses your own numbers. No email gate, no login, no estimated rate presented as official.

How to use these playbooks

Read the effective date first. A fee or border rule that changed last month invalidates every price list built before it, and the error usually hides in the cheapest SKU. Then open the paired calculator and enter your own unit economics — the output is only as good as the inputs.

Every page links to the primary official source rather than a secondary blog. Where a number comes from seller reports rather than a regulator, the page says so. Nothing here is legal, tax or customs advice; use it to ask better questions of your broker or counsel.

All entries

Amazon FBA fee stack (2026)Referral, fulfilment, storage, returns and ads — the five lines that decide your payout, and the order to model them in. Amazon return processing feeA refund returns the sale price, not the cost of getting the unit back. Here is how to model returns before they eat the margin. US de minimis suspensionThe USD 800 duty-free threshold is suspended for all countries and transport modes. Low-price parcels now carry a customs step. EU ends the €150 duty exemptionThe EU duty relief for consignments up to €150 ends on 30 June 2026, followed by a temporary €3 duty and a €2 handling fee. EU IOSS and import VATIOSS is the VAT lane for low-value imports: the buyer pays VAT at checkout and the parcel arrives without a border VAT charge. GPSR responsible personNon-EU sellers of consumer products need an EU-established responsible person, and the details must appear on the product, packaging and listing. GPSR listing statusGPSR blocks recur when listing fields, labels or documents drift. Treat it as a monthly status check, not a launch task. Germany LUCID packagingLUCID registration is free, but it is only half the requirement: you also need a system participation contract before the first German parcel. EU packaging rules (PPWR) from 2026The Packaging and Packaging Waste Regulation replaces the 1994 directive and reaches every parcel placed on the EU market. UK VAT and the £135 lineFor consignments up to £135, the seller charges VAT at the point of sale. Above £135, import VAT is collected at the border. UK packaging EPR invoicesUK packaging EPR turned into an invoice in October 2025. The first obligation year ran from April 2025, with 50 days to pay. FBA reimbursements and back-chargesBack-charges and reimbursements arrive in batches. Reconcile them weekly so a single settlement does not become a cash crisis. Inventory cash cycleThe cash cycle is the gap between paying a supplier and receiving the marketplace payout. It decides how much cash a reorder really needs. China supplier NNN before samplingA non-disclosure, non-use, non-circumvention agreement is the paperwork that protects the specs you send to a new supplier. Supplier sample round costA sample round is a paid due-diligence step: sample price, courier, inspection and time. Compare landed sample cost, not sticker price. Q4 inbound split vs 3PLPeak inbound rules change the cost of splitting shipments. Compare the split fee with 3PL consolidation per unit before Q4.

Use these with

Amazon FBA Fee Calculator

Model the referral fee, FBA fulfilment, subscription, ads and returns in the order Amazon deducts them.

Open tool →

Amazon Return Cost Calculator

Turn a return rate into the monthly cost of refunds, return processing, shipping and unrecoverable item value.

Open tool →

GPSR Responsible Person Checker

See the EU responsible-person, labelling, technical-file and marketplace obligations before a listing goes live.

Open tool →

Inventory Cash-Flow Calculator

See the cash tied in stock and payout float, the cash cycle in days, runway and the reorder point.

Open tool →

Tell me when the rules change

De minimis thresholds, import tax rates and marketplace fee schedules move more often than most price lists. Leave an address and we will send a short note when one of the tracked markets changes.

Ask a compliance question

Free first answer by email. Tell us the destination, the product and the channel — we will point you to the rule and the official source. No obligation, no sales sequence.

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