Profit and Margin
Estimate whether a product, sales channel or monthly trading period is actually profitable after fees, fulfilment, ads and stock costs.
Free Finance Tools for UK Ecommerce Sellers
Online sellers often know their sales figures but not their true profit. These free ecommerce calculators help you estimate key bookkeeping numbers before you speak to an accountant or start cleaning up your records.
Use them to review VAT threshold exposure, Amazon FBA margins, marketplace fees, payment gateway deductions, cost of goods, advertising spend, bookkeeping workload and Making Tax Digital preparation.
Important: These tools provide estimates only. They do not replace full bookkeeping, VAT advice, tax advice or software reports. Your exact numbers depend on your records, platforms, business structure and tax position.
What You Can Calculate
VAT and Compliance Risk
Check how close your taxable turnover may be to the UK VAT registration threshold and whether your digital records need attention.
Bookkeeping Readiness
Score your ecommerce bookkeeping setup across reconciliation, software, stock tracking, VAT records and monthly reporting.
Choose a Free Ecommerce Calculator
VAT Threshold Calculator UK 2026
Estimate whether your rolling taxable turnover may be approaching the UK VAT registration threshold.
Use VAT calculatorAmazon FBA Profit Calculator UK
Estimate product profit after Amazon referral fees, FBA fees, stock cost, shipping and advertising.
Use FBA calculatorMarketplace Fee & Margin Calculator
Calculate marketplace deductions and net margin for eBay, Shopify, Amazon or multi-channel sales.
Use margin calculatorBookkeeping Readiness Score
Check whether your ecommerce bookkeeping process is clean, scalable and ready for VAT or MTD review.
Use readiness toolCash Flow Buffer Calculator
Estimate how much working capital you may need for stock, VAT, fees, supplier payments and slow payouts.
Use cash-flow calculatorTax Deduction Checklist
Review common ecommerce expenses that should be captured accurately in your bookkeeping records.
View checklistVAT Threshold Calculator UK 2026
The UK VAT registration threshold is based on taxable turnover. Use this simple calculator to estimate whether your ecommerce business may need urgent VAT review. The official GOV.UK threshold guidance should always be checked before making a decision.
Estimate Your Rolling 12-Month Taxable Turnover
Estimate uses a £90,000 VAT registration threshold and a simplified monthly growth projection. It does not assess exempt income, overseas rules, VAT schemes or special cases.
Amazon FBA Profit Calculator UK
Amazon FBA sellers need to look beyond sales revenue. True profit depends on referral fees, fulfilment fees, storage costs, stock cost, inbound shipping, refunds, advertising and other deductions. Use this calculator as a quick product margin estimate.
Estimate Product Profit Per Unit
This estimate does not include every Amazon charge, storage fee, refund, VAT treatment, currency conversion or corporation/income tax impact.
Marketplace Fee & Margin Calculator
Use this tool for Amazon, eBay, Etsy, Shopify or other ecommerce channels when you want a quick monthly profit estimate after platform fees, payment fees, shipping, stock costs and advertising spend.
Estimate Monthly Net Profit
Ecommerce Bookkeeping Readiness Score
Messy ecommerce bookkeeping often starts with small gaps: unreconciled payouts, missing marketplace fees, weak stock tracking or unclear VAT records. Use this score to identify where your bookkeeping process may need attention.
Score Your Current Setup
Ecommerce Cash Flow Buffer Calculator
High sales can still create cash pressure if stock purchases, VAT, advertising, supplier bills and marketplace payout timing are not planned. This calculator estimates a simple working capital buffer.
Estimate a Working Capital Buffer
UK Ecommerce Tax Deduction Checklist
Good bookkeeping is not only about recording sales. It also means capturing legitimate business costs clearly so your accountant can review them properly. The exact tax treatment depends on your business, but these common ecommerce costs should usually be tracked in clean categories.
Common Ecommerce Expenses to Track
- Amazon referral fees, FBA fees, storage fees and subscription fees.
- eBay, Etsy, Shopify, WooCommerce, Stripe, PayPal and Klarna fees.
- Cost of goods sold, supplier invoices, import duty, freight and landed costs.
- Packaging materials, labels, postage, courier charges and fulfilment costs.
- Advertising spend, sponsored product ads, promoted listings and creative costs.
- Software subscriptions, apps, bookkeeping tools, inventory systems and reporting add-ons.
- Professional fees, accountancy, tax support, insurance and business banking charges.
- Home office, phone, internet and equipment costs where they are genuinely business-related.
Bookkeeping tip: Do not wait until year-end to sort ecommerce expenses. Monthly categorisation helps you see real product profitability, prepare for VAT, reduce duplicate entries and make better stock decisions.
2026 Compliance Notes for UK Ecommerce Sellers
For 2026 planning, sellers should keep an eye on VAT registration, digital record keeping, Making Tax Digital and Self Assessment deadlines. GOV.UK states that businesses need to register for VAT when they go over the VAT registration threshold, and the GOV.UK VAT threshold page currently lists the registration threshold as more than £90,000.
GOV.UK also explains that Making Tax Digital for Income Tax applies from 6 April 2026 to sole traders and landlords whose total annual income from self-employment and property is over £50,000. If you sell online as a sole trader, this may affect how you keep records and report income.
Self Assessment deadlines are also important for online sellers. GOV.UK publishes the official filing and payment deadlines, including paper and online return deadlines for each tax year. Always check GOV.UK or speak with an accountant before relying on a deadline.
Useful Official Resources
GOV.UK VAT Thresholds
Check official UK VAT registration and deregistration threshold guidance.
Making Tax Digital for Income Tax
Review who needs to use MTD for Income Tax and when it starts.
Self Assessment Deadlines
Check official deadlines for filing Self Assessment tax returns and payments.
Internal Resources for UK Ecommerce Sellers
After using the calculators, explore related support pages to improve your bookkeeping, VAT records and profit reporting.
Amazon Seller Bookkeeping Services
Specialist support with Amazon settlements, FBA fees, refunds, ads and profit reports.
Ecommerce Bookkeeping Services
Bookkeeping for Amazon, eBay, Shopify, Etsy, WooCommerce and multi-channel sellers.
VAT Services for Ecommerce Sellers
Support with VAT records, VAT return preparation and digital bookkeeping processes.
Book a Free Consultation
Discuss your ecommerce finance setup, bookkeeping issues and next steps with our team.
Free Ecommerce Bookkeeping Guides
Read practical guides about marketplace reconciliation, VAT, software and reporting.
Bookkeeping Pricing
Understand how bookkeeping pricing can vary by platform, volume and VAT status.
Free Ecommerce Tools & Calculators FAQs
Are these ecommerce calculators really free?
Yes. These calculators are free to use and are designed to help UK ecommerce sellers understand common bookkeeping, VAT, profit and cash-flow questions before seeking tailored advice.
Can the VAT threshold calculator confirm whether I must register for VAT?
No. It gives a simple estimate only. VAT registration depends on taxable turnover, timing, business activity and special rules. Always check official GOV.UK guidance or speak with a VAT adviser before making a decision.
Does the Amazon FBA calculator include every Amazon fee?
No. Amazon fees vary by category, product size, fulfilment method, storage period, promotions, refunds, currency and account setup. This calculator is a quick margin estimate, not a replacement for Amazon reports or full bookkeeping.
Are these tools suitable for eBay and Shopify sellers?
Yes. The marketplace margin and bookkeeping readiness tools are useful for eBay, Shopify, Etsy, WooCommerce and multi-channel sellers because they focus on fees, payouts, cost of goods, advertising and monthly reporting.
Can I use these calculators for Making Tax Digital preparation?
They can help you identify bookkeeping weaknesses, but they do not submit MTD updates or confirm compliance. MTD usually requires digital records and compatible software where the rules apply.
What should I do after using the calculators?
Save your results, compare them with your accounting software and marketplace reports, then review any gaps. If the numbers look unreliable, you may need a bookkeeping clean-up, VAT review or monthly ecommerce bookkeeping support.
Need Help Turning Calculator Results Into Clean Books?
Book a free consultation with Seller Bookkeeping UK and get practical guidance on Amazon FBA bookkeeping, eBay and Shopify reconciliation, VAT records, Making Tax Digital preparation and ecommerce profit reporting.