Nearly £3 in every £10 that shoppers in Great Britain spend now goes online rather than through a till. The Office for National Statistics said online sales accounted for 29.4% of retail spending in June 2026, the highest since April 2021. That is welcome news on the sales side and awkward on the paperwork side, because your money now arrives in pieces from Shopify, Amazon, eBay, Etsy, PayPal and Stripe, each taking its own cut on its own timetable.
Accounting for small ecommerce business means recording every sale, platform fee, refund, postage cost, ad spend and stock purchase across all your channels, then turning those records into figures you file with HMRC and use to price your products. It works differently from ordinary bookkeeping because the money landing in your bank is a net payout, not your sales total. Good records pull the two apart, so you know your real turnover, your profit per order and the tax due on it.
In this blog you will learn whether cash basis or accrual suits you, how to set up a system, how to track multi channel sales, which costs you can claim, how to get cost of goods sold right, how VAT applies, which reports to read, the mistakes that drain profit, and when to hire an accountant.
What Is Ecommerce Accounting?
Ecommerce accounting is the recording and reporting of money moving through an online shop: sales on marketplaces and your own site, platform fees, refunds, shipping, stock bought in, advertising, and any tax collected on top of the price. It produces records HMRC accepts, returns filed on time, and numbers you can act on.
It needs its own name because of how payouts work. Amazon might take £3,200 of sales in a fortnight, deduct referral fees, fulfilment, storage, ads and refunds, then pay you £2,180. Record the gross sales and the deductions separately, rather than booking the payout as sales. Record £2,180 as your sales, and your turnover is wrong, your costs are missing, and your VAT position may be too.
So, this is not a fancier form of bookkeeping. It is ordinary bookkeeping applied to a trade with many payment routes, thousands of small transactions, stock in several places and customers in more than one country. Accounting for small ecommerce business unpicks all of that, one payout at a time.
Why Accurate Accounting Matters for Small Ecommerce Businesses
Accurate records do more than keep HMRC content. They show which products earn their shelf space, which channel loses money once fees are counted, and whether you can afford more stock next month. Sellers who work flat out for very little are often not selling badly, they just cannot see where the margin leaks.
You know your real profit per product
Match fees, postage, packaging, ads and returns to each item and some best sellers turn out to be barely profitable. That tells you to reprice or drop the line before you scale a loss.
You avoid surprise tax bills
Profit is worked out from records, not memory. Sellers with monthly books know roughly what they owe long before the deadline, so the money is set aside rather than scrambled for in January.
You stay on the right side of HMRC
Online marketplaces pass seller data to HMRC each year, so your figures need to match what the platforms report. Tidy records give you a straight answer if a question arrives.
You can plan around payout cycles
Marketplaces hold funds, stock ties up cash, and VAT falls due on a fixed date. A simple cash view shows whether next month’s supplier invoice and tax bill can both be covered.
Accuracy is not admin for its own sake. Careful accounting for small ecommerce business shows where the money is really made, early enough to fix problems while they are small.
Cash Basis vs Accrual Accounting: Which Should You Use?
There are two recognised approaches to accounting for small ecommerce business. The cash basis counts money when it moves. Accrual accounting, also called traditional accounting, counts income when the sale is made and costs when they are incurred, whether cash has moved or not.
| Point of comparison | Cash basis | Accrual accounting |
| When a sale count | When the payout reaches you | When the order is placed |
| When a cost count | When you pay it | When you receive the goods |
| Unsold stock | Usually, a cost when bought | Held as stock until sold |
| Who uses it | Sole traders, as the default | Anyone opting out, and all companies |
| View of profit | Simple, follows the bank | Matches costs to the sales they made |
| Effort | Low | Higher, needs stock records |
If you are a sole trader with modest turnover, little stock and suppliers you pay on the spot, the cash basis is straightforward and is now the default for eligible sole traders and partnerships. Accrual fits better once you buy stock in bulk, use supplier credit, hold inventory in warehouses or trade through a limited company, since limited companies generally must prepare accounts on an accrual basis. Whichever method you use, apply it consistently and understand that cash basis records income when received and expenses when paid, while accrual accounting matches income and costs to the period they relate to.
Setting Up Your Ecommerce Accounting System
A workable system is not complicated. It needs one route for money in, money out and stock, with each step recorded once and checked monthly. Build it in this order and accounting for small ecommerce business stops being a yearly panic.
1. Separate your money
Open a dedicated bank account for your small ecommerce business and run everything through it.
- One account for trading only
- A card just for stock
- A savings pot for tax
- Personal transfers labelled as drawings
- No cash spending without a receipt
2. Pick software that connects to your channels
Choose software that links to your bank and your selling platforms so entries arrive on their own. If you are VAT registered, or now inside Making Tax Digital for Income Tax, it must be HMRC compatible. From 6 April 2026, MTD for Income Tax applies to sole traders and landlords with qualifying income over £50,000.
- Bank feed as standard
- Links to Shopify, Amazon, eBay, Etsy
- VAT returns filed from the software
- Receipt capture by phone
- Room to grow
3. Set up a simple chart of accounts
This is the list of categories your entries fall into, short enough to use and detailed enough to be useful.
- Sales split by channel
- Platform and payment fees
- Postage, packaging, fulfilment
- Advertising by platform
- Stock purchases and freight
4. Track stock and cost of goods sold
Record what you buy, hold and sell, even if that starts as a spreadsheet.
- Landed cost per unit
- Opening and closing stock counts
- Duty and freight included
- Damaged stock written off
- A count every quarter
5. Build a monthly routine
Book a fixed hour each month and store every invoice digitally. Records must be kept six years by a limited company, and five years after the filing deadline for Self Assessment.
- Reconcile every account
- Match payouts to channel reports
- File supplier invoices as you go
- Check tax set aside
- Review the numbers
The setup work happens once, while the benefit turns up every month in cleaner figures and less time hunting for information.
How to Track Sales Across Multiple Channels (Shopify, Amazon, eBay, Etsy)
Selling in several places multiplies the admin. Each platform reports sales differently, deducts different fees, pays out on its own cycle and handles tax its own way. One marketplace may remit the tax for you while another leaves it with you, and refunds often land in a later period than the sale.
1. Post gross sales, then deduct fees
Never treat a payout as your sales figure. Record the gross sale, then each deduction as its own cost.
- Gross sales per channel
- Commission and listing fees
- Payment processing charges
- Refunds and chargebacks
2. Reconcile payouts to settlement reports
Each platform publishes a statement showing what made up a payment. Match it line by line.
- Download reports monthly
- Tie each deposit to a report
- Chase differences straight away
3. Use an integration or one manual routine
An automated link saves hours, but a disciplined spreadsheet works at low volumes.
- One method per channel
- The same date basis throughout
- Notes on anything odd
4. Keep channel level reporting
Group sales, fees and shipping by channel so you can compare them fairly.
- Revenue and margin by channel
- Ad spend by channel
- Return rates by channel
Treat each channel as its own stream feeding one set of books. Once every payout traces back to gross sales and named costs, multi channel accounting for small ecommerce business becomes routine.
What Expenses Can You Claim as an Ecommerce Business?
Costs incurred wholly and exclusively for your trade are deducted before tax is worked out, and online sellers have more of them than they realise. If something exists to help you buy, list, store, sell or ship stock, it is normally allowable. Where an item is also used privately, such as a phone or a room at home, claim only the trade share.
Claiming properly is not aggressive tax planning, it is arriving at the right profit. Sellers who leave costs out pay tax on money they never kept.
- Stock, raw materials, import duty and inbound freight
- Marketplace commission, listing and subscription fees
- Payment processing charges from Stripe, PayPal and similar
- Postage, couriers, packaging and returns
- Storage, warehouse rent and fulfilment charges
- Advertising, from marketplace ads to social campaigns
- Software, hosting, domains and plugins
- Accountancy and professional fees
- Insurance for your small ecommerce business
- A fair share of home working, phone and broadband
- Travel, mileage, laptops and printers
Client entertaining, fines and your own drawings are never allowable. Bigger equipment is usually claimed through capital allowances rather than as a straight expense, so check the treatment before you post it.
Stock and Inventory: Getting Cost of Goods Sold (COGS) Right
Cost of goods sold is what you paid for the items you actually sold in a period, and it separates turnover from gross profit. Work it out as opening stock, plus purchases, minus closing stock. Stock still sitting in the garage or a fulfilment centre is not a cost of sale yet, it is an asset you own.
The second half of getting this right is landed cost. A supplier invoice is rarely the full story, so add shipping to your door, import duty, currency charges and any repacking, then divide by the units received. Stock bought at £4 a unit can easily cost £5.40 landed, which changes the maths on a £9.99 listing once fees and postage come off.
Count your stock at least quarterly and write off anything broken, lost or unsellable rather than carrying it at full value. Where the same item was bought at different prices, stick to one approach, such as first in first out, so periods stay comparable. Believable stock records make your gross margin believable, and that margin tells you whether your small ecommerce business is working.
VAT for UK Ecommerce Sellers
VAT catches online sellers out more than any other tax, mainly because growth can push you over the line without warning. You must register once taxable turnover passes £90,000 in any rolling 12 month period, and that window resets every month rather than following the tax year. Marketplace sales count towards it, and so do zero rated sales.
Registration and the rolling threshold
Check your last 12 months of taxable turnover at the end of every month. If it has passed £90,000, register for VAT; HMRC says you must do this when your taxable turnover is over the threshold or you expect it to go over it. HMRC’s threshold for VAT registration is £90,000, and the Flat Rate Scheme is available only where VAT turnover is £150,000 or less.
Getting the rate right on your products
Most goods are standard rated at 20%, while children’s clothing, books and most food are zero rated. The wrong rate on a whole range becomes an error repeated across thousands of orders. Check the category before launching a new line.
Marketplace and cross border rules
Where a marketplace counts as the supplier, it may collect and pay the VAT itself, which changes what you report. Imported consignments valued at £135 or less follow different rules from larger shipments. Selling to customers abroad brings its own obligations, so take advice first.
Choosing a VAT scheme
Standard accounting suits most sellers who reclaim VAT on stock. The Flat Rate Scheme can be simpler where costs are low, and annual accounting spreads the paperwork. Compare the cash effect on your own figures rather than picking on simplicity.
Software and Making Tax Digital
VAT registered sellers must keep digital records and file through compatible software. Since 6 April 2026 the same approach applies to sole traders with qualifying income above £50,000, who now send quarterly updates too, with the threshold dropping to £30,000 from April 2027.
Watch the threshold monthly, choose your scheme deliberately, and let software file. VAT handled early is a small job, while VAT handled late becomes a backdated bill with penalties and interest on top.
Essential Financial Reports Every Ecommerce Seller Should Understand
Three reports tell you almost everything. The profit and loss shows income less costs over a period, the balance sheet shows what you own and owe at a point in time, and the cash flow statement shows money actually moving in and out.
Reports are only as good as the bookkeeping behind them, which is why accounting for small ecommerce business starts with the records. Read them monthly rather than once a year at filing time, and compare each month with the last so trends show up. A margin that slips two points for three months running is still fixable in month four.
- Profit and loss: turnover, cost of goods sold, gross profit, overheads, net profit
- Balance sheet: stock, cash, money owed to you, money you owe
- Cash flow statement: timing of receipts, payments, payout delays and tax dates
- Gross margin by product and channel: where profit is actually earned
- Inventory report: stock on hand, slow movers and stock turn
- Ad spend against sales: return on marketing by channel
You do not need to be an accountant to read these. Pick two figures to watch each month, gross margin and cash in the bank being a good start, and the rest of the picture follows.
Common Accounting Mistakes Small Ecommerce Sellers Make
Accounting problems in an online shop are rarely dramatic. They build up quietly, then surface as an unexpected tax bill or a decision made on figures that were never right.
Recording net payouts as sales
Treating the bank deposit as turnover understates both sales and costs. It can also hide the fact that you passed the VAT threshold months ago. Post gross sales and deduct fees separately.
Mixing personal and trade spending
One account used for both turns every reconciliation into guesswork. It also risks claiming private costs by accident, which HMRC takes seriously. Separate the money from day one.
Ignoring stock in the profit figure
Counting all stock purchases as costs in the month they were bought distorts profit badly. A large order before a busy season can make a good period look like a loss. Use opening and closing stock instead.
Leaving the books until the deadline
A year of receipts reconstructed in January produces guesses and missed claims. It also removes any chance of tax planning. Monthly bookkeeping takes less total time than an annual catch up.
Not setting money aside for tax
VAT collected on sales is not yours to spend, and tax follows profit rather than your bank balance. Sellers who move a percentage of each payout into a separate pot rarely miss a payment.
None of this needs specialist knowledge, only a routine. An hour a month spent on accounting for small ecommerce business prevents nearly all of it.
Should You Do Your Own Books or Hire an Accountant?
| Consideration | Doing your own books | Hiring an accountant |
| Cost | Software subscription only | Monthly or annual fee |
| Your time | Several hours a month | Minutes spent sending records |
| Risk of error | Higher on VAT and stock | Lower, with a review built in |
| Tax savings | Limited to what you know | Reliefs applied properly |
| Deadlines | Yours to remember | Managed and filed for you |
| Suits | One channel, low volumes, no VAT | VAT registered, multi channel, growing |
For a sole trader on one platform, below the VAT threshold, with a few orders a week, doing your own books in decent software is sensible. It changes once you register for VAT, sell on several marketplaces, hold real stock, import goods or trade through a limited company, because a fee is usually smaller than the tax and errors it prevents. For most sellers the honest answer is a mix: keep your own day to day records, and pay a professional to review them, handle VAT and file the returns.
FAQs: Frequently Asked Questions
Do I need an accountant for my small ecommerce business?
There is no legal requirement, and the smallest sellers often manage alone. Once VAT, several channels or a limited company are involved, an accountant usually saves more than the fee.
When do I need to register for VAT as an online seller?
When taxable turnover passes £90,000 in any rolling 12 month period, tell HMRC within 30 days of that month ending. Register immediately if you expect to pass it within the next 30 days.
What is the best accounting software for ecommerce sellers in the UK?
The best option is HMRC compatible software that links to your bank and your channels, such as Xero, QuickBooks, FreeAgent or Sage. Choose on integrations and VAT handling rather than price.
Should I outsource accounting or hire in house?
Outsourcing accounting for small ecommerce business is cheaper and more flexible, since you pay only for the work you need. An in-house bookkeeper makes sense at higher volumes across several channels.
What are the biggest accounting mistakes ecommerce sellers make?
Treating net payouts as sales, mixing personal and trade money, and ignoring stock when working out profit. Each one distorts your figures and can lead to late VAT registration.
How is ecommerce accounting different from normal small business accounting?
The rules are the same, but the data is messier. Several payout streams, platform fees, refunds, stock in different places and cross border sales all need unpicking first.
Conclusion
Accounting for small ecommerce business comes down to habits rather than talent. Keep trading money separate, record gross sales and every fee taken off them, know your landed cost per unit, watch the VAT threshold monthly, and read your figures often enough to spot a slipping margin. Sellers who do that rarely get a nasty surprise at filing time.
If you would rather spend that time on your shop, MyIVA can take it off your hands. We work with sole traders, small firms and online sellers on Amazon, eBay, Shopify and Etsy, covering bookkeeping, VAT returns, Making Tax Digital submissions, Self Assessment and Corporation Tax filing, at fixed fees and with no jargon. A dedicated expert reviews your records, filings reach HMRC and Companies House on time, and you see every draft before it goes.
