Do I need an ecommerce accountant in the UK? What they actually do

You can run an online shop without an accountant. Plenty of sellers do, right up until a VAT threshold, a marketplace payout report, or a tax bill turns into a problem they cannot unpick on their own.

So the honest answer to "do I need an ecommerce accountant?" is: not always, but the point at which you do tends to arrive faster than it does for a normal small business. Online selling stacks up VAT quirks, foreign currency, platform fees and stock movements that ordinary bookkeeping was never built for.

This guide explains what an online-seller accountant actually does day to day, the signs you have outgrown doing it yourself, and roughly what it costs your margin to leave it too late. Every tax rule and figure here is grounded in current HMRC guidance, with sources at the end.

What does an ecommerce accountant actually do? {#what-they-do}

The job is not "doing your tax return once a year". A good ecommerce accountant works with the moving parts of an online business throughout the year, then files the right returns at the right time.

In practice the work breaks down like this:

• Untangling marketplace payouts. Amazon, eBay, Etsy and Shopify do not pay you your sales. They pay you sales minus fees, minus refunds, minus reserves, sometimes in another currency. An accountant reconciles the gross sale to the net payout so your books show real turnover, not just what landed in the bank.
• Getting VAT right. This is the big one. Working out when you cross the £90,000 registration threshold, which scheme suits you, what VAT applies to your platform fees, and how overseas sales are treated.
• Reclaiming input VAT you are owed. Since 1 August 2024 Amazon charges 20% UK VAT on seller fees, which a VAT-registered seller reclaims as input tax. Miss that and you hand back margin for no reason.
• Bookkeeping and cost of goods sold. Tracking stock, landed costs, shipping and returns so your gross margin is real rather than a guess.
• Year-end accounts and the tax return. Self Assessment if you are a sole trader, or statutory accounts and a corporation tax return if you trade through a limited company.
• Forward planning. Whether to incorporate, how to draw money tax-efficiently, and when registering for VAT voluntarily actually pays off.

The common thread is that an ecommerce accountant translates messy platform data into numbers you can file and trust. You can read more about how we approach this on our ecommerce accounting page.

How is ecommerce accounting different from normal accounting? {#different}

A high-street shop sells a thing, takes the money, banks it. The bank statement is close to the truth. Online selling breaks that simple chain in four ways.

1. Your turnover is not your payout. A £40 sale on a marketplace might land as roughly £30 after referral fees, fulfilment fees and VAT on those fees. For VAT and tax, your turnover is the £40, not the £30. Get this wrong and you can sail past the registration threshold without realising.

2. Fees carry their own VAT. Platform fees are a cost with VAT attached. A registered seller reclaims that VAT; an unregistered one simply absorbs it. Tracking it line by line is fiddly, but it is real money.

3. Stock and cross-border movement. Holding stock in a fulfilment centre, or in the EU, changes where you may owe VAT. As a general rule, storing goods in another country can trigger a VAT registration obligation there. This area is genuinely technical and changes with platform programmes, so it is one to take advice on rather than guess.

4. Multi-currency and high transaction volume. Hundreds or thousands of small transactions, refunds and chargebacks, sometimes across currencies, are not something a once-a-year shoebox of receipts can handle. It needs proper bookkeeping software fed by your platforms.

None of this is exotic for an accountant who works with sellers. It is exactly the everyday mess we expect. The risk is that a generalist accountant treats your Amazon payout as your turnover and quietly builds an error into your VAT position.

Do I need an accountant or just a bookkeeper? {#accountant-vs-bookkeeper}

Talk to an e-commerce accountant →

These are different jobs, and growing sellers usually end up needing both.

A bookkeeper keeps the day-to-day records straight: reconciling payouts, categorising costs, tracking stock and keeping you ready for VAT returns. An accountant sits above that, handling the tax decisions, the year-end accounts, the VAT scheme choice and the planning.

For a smaller sole trader, one firm doing both is usually enough. As you scale, the split matters more: clean bookkeeping every month makes the accountant's job (and your bill) smaller. We cover the day-to-day side in our bookkeeping service.

Signs you have outgrown DIY accounting {#signs}

You do not need an accountant the moment you make your first sale. You probably do need one when any of these are true:

• You are within sight of the £90,000 VAT threshold. Once your rolling 12-month taxable turnover approaches it, the planning needs to start before you cross it, not after.
• You sell across more than one channel. Amazon plus Shopify plus eBay means three different fee structures and payout reports to reconcile.
• You hold stock abroad or sell overseas. Foreign VAT obligations are where DIY sellers most often go wrong.
• You have incorporated, or are thinking about it. A limited company brings statutory accounts, a corporation tax return and confirmation statements that carry real deadlines and penalties.
• You are spending evenings on spreadsheets instead of selling. If bookkeeping is eating the hours you should spend growing, the maths usually favours handing it over.
• You have had a letter from HMRC, or a platform has reported your income and you are not sure your records match.

If two or more of these ring true, the question stops being "do I need an accountant" and becomes "how much is not having one already costing me".

Illustrative example: the cost of leaving it late {#worked-example}

Illustrative example. Sam sells homeware through Amazon FBA and a Shopify store. He crossed the £90,000 VAT registration threshold partway through the year but, reading only his net payouts, thought he was still under it. He registered four months late.

Once registered, Sam has to account for VAT on the sales he made from the date he should have registered, even though he never charged his customers that VAT. On £45,000 of sales in that late period, the VAT he now owes is buried in his prices. Treating the £45,000 as VAT-inclusive, the VAT element is £45,000 x 1/6 = £7,500 that comes straight out of his margin, before any late-registration penalty HMRC may add.

Two things would have prevented it. First, tracking gross turnover (the £40 sale, not the £30 payout) so the threshold was visible in real time. Second, reclaiming the 20% VAT Amazon charges on his seller fees once registered, which softens the blow going forward. An accountant watching the rolling 12-month figure flags the threshold weeks before it bites, not four months after.

The figures here are illustrative, but the pattern is one we see often: the expensive mistakes in ecommerce are almost always VAT mistakes, and almost always about timing.

What about VAT, MTD and the £90,000 threshold? {#vat-mtd}

VAT is where an ecommerce accountant earns their fee fastest, so it is worth being clear on the current rules.

You must register for VAT once your VAT-taxable turnover goes over £90,000 in any rolling 12-month period, a threshold in place since 1 April 2024 (gov.uk VAT registration thresholds). You can deregister if it falls below £88,000. For ecommerce, the trap is that turnover means your gross sales, not your marketplace payouts.

Once registered, you charge VAT on your UK sales, you reclaim VAT on costs (including the 20% Amazon now charges on seller fees since 1 August 2024), and you file under Making Tax Digital. MTD for VAT is mandatory for all VAT-registered businesses, meaning digital records and returns filed through compatible software (gov.uk Making Tax Digital for VAT).

There is a second MTD change worth flagging if you trade as a sole trader. From 6 April 2026, Making Tax Digital for Income Tax applies to sole traders and landlords with qualifying income over £50,000, based on their 2024/25 return, with lower thresholds phasing in afterwards (gov.uk: check when to sign up for MTD for Income Tax). It means quarterly digital updates rather than one annual return, which is a real change to how unincorporated sellers keep records.

If you are weighing up voluntary registration to reclaim fee VAT, or you are nearing the threshold, this is exactly the call we model with sellers through our VAT services before you commit.

How much does an ecommerce accountant cost, and is it worth it? {#cost}

Fees vary with your turnover, your number of sales channels, whether you are VAT registered, and whether you trade as a sole trader or a limited company. A single-channel sole trader pays far less than a multi-channel VAT-registered limited company. Most UK ecommerce accountants work on a fixed monthly fee so the cost is predictable rather than a surprise at year-end.

The better question is what it is worth. An accountant pays for themselves when they:

• Stop you registering for VAT late, which (as the example above shows) can cost thousands in unrecoverable VAT plus penalties.
• Reclaim input VAT you would otherwise miss, including the VAT on platform fees.
• Pick the right structure and VAT scheme, so you are not on a scheme that quietly costs you margin.
• Keep you off HMRC's radar, with records that match what platforms report about you.
• Give you back your evenings to do the thing that actually grows the business.

For a hobby seller turning over a few thousand pounds, a good accounting app and an annual Self Assessment may be plenty. For a serious online business approaching or past the VAT threshold, going without is usually a false economy. We are happy to tell you honestly which side of that line you are on.

Frequently asked questions {#faqs}

Do I really need an accountant to sell online?

Not at the very start. A small hobby seller can manage with good software and a simple Self Assessment return. You typically need one once you approach the £90,000 VAT threshold, sell across multiple channels, hold stock abroad, or incorporate, because that is where the costly mistakes live.

When should an online seller register for VAT?

You must register once your VAT-taxable turnover exceeds £90,000 in any rolling 12-month period. For ecommerce, turnover is your gross sales, not your marketplace payouts after fees, which is why sellers sometimes cross the threshold without noticing. You can also register voluntarily to reclaim VAT on costs.

What is the difference between an ecommerce accountant and a normal accountant?

The day-to-day issues differ. An ecommerce accountant routinely reconciles marketplace payouts to gross sales, handles VAT on platform fees, deals with cross-border stock and currency, and works with high transaction volumes. A generalist who treats your Amazon payout as your turnover can build a VAT error into your accounts without meaning to.

Can my accountant reclaim the VAT Amazon charges on fees?

Yes, if you are VAT registered on standard accounting. Since 1 August 2024 Amazon charges 20% UK VAT on seller fees, and a registered seller reclaims that as input tax on the VAT return. An accountant makes sure it is captured every period rather than left on the table.

Do I need an accountant if I am below the VAT threshold?

Often not for compliance alone, but it can still pay off. Clean bookkeeping shows your real margin, keeps you ready if you do cross the threshold, and means your Self Assessment is straightforward. From 6 April 2026, Making Tax Digital for Income Tax also affects sole traders with qualifying income over £50,000, which is worth planning for early.

Get a straight answer on whether you need one

If you sell online and you are not sure whether you have outgrown doing your own books, the cheapest time to ask is before a VAT threshold or a payout report forces the question. We will look at your channels, your turnover and your structure and tell you honestly what you need, and what you do not. Book a call with a Zmartly accountant through our contact page.