Amazon seller resource library

Every free calculator, workbook, checklist and guide we have built for UK Amazon sellers. All of it free, none of it behind an email form, all of it on 2026/27 rates. Each section leads with the one worth opening first.

Format

37 resources, all free, no signup

Calculators

Work the number out on the page, then take the Excel version away.

Start hereBreak-Even ACoS CalculatorThe ACoS above which an advertised unit stops making money. It is your contribution as a percentage of the selling price, and it is not your gross margin. Registering for VAT takes exactly 16.67 points off it, for every product you sell.Break-even ACoS, break-even ROAS and the most you can pay a clickThe exact cost of VAT registration to your advertising headroomTen ASINs ranked by the gap between what you pay and what you can affordCalculator plus Excel FBA vs FBM CalculatorBoth routes with your own hours costed rather than treated as free. Self-fulfilment usually pays a couple of pounds an hour.Calculator plus Excel FBA Storage Fee EstimatorWhat storage costs per unit sold rather than per month, and the sales rate at which stock tips past the aged surcharge.Calculator plus Excel Amazon Profit CalculatorReferral fees, fulfilment and storage taken off a selling price to leave what you actually keep.Calculator VAT Threshold TrackerRolling twelve-month turnover against the £90,000 threshold, with your notification and registration dates.Calculator plus Excel Seller Take-Home CalculatorStore profit followed all the way to your pocket, through employer NI, corporation tax and dividend tax.Calculator plus Excel VAT CalculatorAdd VAT or take it out of a gross figure, at any rate.Calculator plus Excel Corporation Tax Calculator19 and 25 per cent with marginal relief handled, including the 26.5 per cent band people do not expect.Calculator plus Excel Dividend Tax CalculatorThe 2026/27 rates with the £500 allowance and the personal allowance taper both applied.Calculator plus Excel Payslip CalculatorTake-home pay after income tax, National Insurance, pension and student loan.Calculator plus Excel Profit Margin CalculatorGross and net margin, with the markup conversion that stops the two being confused.Calculator plus Excel Break-Even Point CalculatorThe sales level at which contribution finally covers your fixed costs, in units and in revenue.Calculator plus Excel COGS CalculatorWhat the goods you actually sold cost you, from opening stock, purchases and closing stock.Calculator plus Excel

Workbooks and trackers

Excel files that keep working after you close the tab.

Start hereSettlement Reconciliation WorkbookFrom the settlement report to the money that reached your bank, with the double-entry journal behind it. It also works out how much of your own cash is permanently sitting with Amazon.Every deduction between gross sales and the depositA journal that balances whatever the bank actually didThe quarter of a month's sales the cycle and reserve tie upExcel workbook ASIN Margin TrackerContribution per product after referral, FBA, storage and ads, ranked so the ones losing money surface.Excel workbook Restock and Inventory PlannerWhen to order, and the quantity that costs least once storage is counted against the freight you save.Excel workbook FBA Reimbursement TrackerMoney Amazon owes you for lost, damaged and short-received units, with a countdown on every claim.Excel workbook Amazon Bookkeeping TemplateTwelve months of settlements into a profit and loss account and four VAT quarters.Excel template 13-Week Cash Flow ForecastBuilt on the settlement cycle, because half your weeks have no income in them at all.Excel workbook Director's Loan Account TrackerThe section 455 charge at both 2026 rates, the benefit in kind, and the nine-month clock.Excel workbook Tax CalendarEnter your year end and get every filing and payment date, with days to go and the penalty for missing each.Excel workbook Inventory Count WorkbookCounts and values stock at the lower of cost and net realisable value, then bridges it into cost of sales.Excel workbook Mileage and Home Office LogBusiness mileage at the 55p rate and the home office claim three ways.Excel workbook

Checklists

Printable, timed, and ordered so nothing depends on something later.

Start hereYear-End ChecklistStock count, cut-off and the liabilities people forget. Roughly a third of it has to happen before your year end rather than after it, which is why most year-end advice arrives too late to help.Thirty-five items across six sectionsThe decisions that expire the moment the date passesA three-item shortlist if you will not do all of itPrintable, 3 hours Monthly Close ChecklistNinety minutes a month, in the only order that works: settlements reconciled before margins are judged.Printable, 90 minutes HMRC Records ChecklistWhat to keep, in what form, and for how long. An audit of what you already have.Printable, 20 minutes VAT Registration ReadinessThe checks and decisions before you register, including the pre-registration VAT most people miss.Printable checklist Am I Ready to Go Limited?The signals that make incorporating worth it, and the reasons that no longer count.Printable checklist New Seller Setup ChecklistThirty-five things that take minutes now and hours to sort out retrospectively.Printable, 2 hours

Guides and e-books

The longer reads, with worked examples on current rates.

Start hereThe Pan-EU VAT GuideOne box in Seller Central can create five foreign VAT registrations. What it does, what it costs, and the volume at which it starts to be worth it.Why registration follows your stock rather than your salesThe break-even volume, calculated rather than assertedWhat changed on 1 July 2026 for anything under 150 eurosE-book, eleven chapters The UK Tax HandbookSixteen chapters on UK tax for online sellers, from whether you are trading at all to the mistakes that cost most.E-book Sole Trader or Limited?The comparison on 2026/27 rates at three profit levels, including where a sole trader still keeps more.E-book From First Sale to First VAT ReturnOne shop followed through eighteen months and every tax event on the way.E-book Pricing for ProfitLanded cost, margin, contribution and break-even ROAS, and what VAT registration does to a price list.E-book

Look it up

For when you need one word or one answer rather than a tool.

Start hereAmazon Seller GlossaryThe words that mean something different on Amazon, or nothing anywhere else. Settlements, reserves, ACoS, size tiers and Pan-EU, each with the free tool that deals with it.Written for UK sellers, so the thresholds are the UK onesEvery term links to the calculator or workbook behind itCross-linked to the 144-term e-commerce glossary56 terms, searchable Ask an AccountantThirty-seven questions sellers actually ask, answered the way they would be on a call.37 questions E-commerce Accounting GlossaryThe 144 general terms: landed cost, contribution, VAT thresholds, payouts, stock and year end.144 terms

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