Flat rate VAT for online sellers: is it costing you money?

On standard VAT accounting you pay HMRC the VAT you charged customers and take off the VAT you paid on purchases. On the flat rate scheme you hand over a fixed percentage of your VAT inclusive turnover and, with a narrow exception for capital assets costing £2,000 or more, you reclaim nothing on what you bought.

For a consultant with a laptop and a phone bill, that trade is fine. For a seller shifting physical goods it is a different conversation. Your stock, your packaging, your software subscriptions, your advertising and your fulfilment fees all carry input VAT you are no longer taking back. Every month you grow, that unreclaimed amount grows with you.

There are two thresholds worth knowing. You can only join if your VAT taxable turnover for the next twelve months is expected to be £150,000 or less, and you have to leave once total business income including VAT passes £230,000 in a twelve month period, or once you expect it to. Plenty of sellers cross that second line during a strong Q4 and only notice when someone goes looking.

This is the one that costs sellers the most and gets spotted the least. If a meaningful share of your orders go to customers outside the UK, those sales may carry no UK VAT at all. On the standard scheme you would account for them correctly and still reclaim the input VAT on the stock behind them.

On flat rate, the calculation starts from your turnover. The scheme takes its percentage and does not care much about where the customer was standing when they bought.

We moved a watch seller off flat rate who had around 70 per cent of her sales going overseas. On the standard scheme she now pays VAT on the UK 30 per cent and reclaims her input VAT in full. Nothing about her business changed. The scheme she was sitting on had simply stopped matching what she sold and where she sold it, and nobody had been back to check since the day she registered.

If you sell abroad through Shopify, Amazon, Etsy or eBay and you are still on flat rate, that is the first number to put a pencil through.

HMRC added a rule aimed at businesses using the scheme with barely any goods spend. If you spend less than 2 per cent of your VAT inclusive turnover on goods, or under £1,000 a year, you fall into the limited cost category and pay 16.5 per cent regardless of what your trade sector rate says.

Sellers assume this cannot apply to them because they buy stock. Sometimes that is right. But the definition of goods is narrower than most people expect, and several things sellers spend heavily on do not count towards the test. Software, advertising, professional fees and most services are outside it.

A dropshipper who never touches inventory, a print on demand seller, a seller whose supplier invoices sit outside the goods definition: all of them can fail the test while feeling like a product business. At 16.5 per cent of gross turnover with no input VAT coming back, the maths stops working quickly.

The test is applied each VAT period, not once at the start. A quiet quarter can push you into it without any warning.

I am not going to tell you the scheme is always wrong. It is not.

Flat rate still works for a seller with genuinely low input VAT, a UK only customer base and a sector percentage that lands below what they would otherwise hand over. Some service led businesses and some sellers with non standard rated supply chains come out ahead. There is also a 1 per cent discount in your first year of VAT registration, which can make the early months look better than the steady state.

What we object to is leaving the decision on autopilot. The scheme was chosen when the business looked one way. Three years later you have overseas orders, a bigger stock bill, Amazon fees and a fulfilment contract, and nobody has revisited it.

The other thing worth saying plainly: moving schemes is not a formality. HMRC has rules on when you can change and what date the change takes effect, and a change that goes through sloppily can leave returns wrong in both directions. It is worth doing once and doing it properly.

When a seller sends me their figures, the review takes a short call and looks at the same handful of things every time.

• The split between UK and overseas sales, taken from the marketplace reports rather than the bank.
• Input VAT you are currently absorbing: stock, import VAT, fulfilment, software, advertising.
• Whether the limited cost rule bites in any of your recent periods.
• Where turnover sits against the leaving threshold, including seasonal peaks.
• How returns and refunds have been treated, because that often distorts the picture on both schemes.

The same exercise usually turns up something adjacent. Import VAT posted as a plain cost rather than reclaimed. Reverse charge missed on overseas supplier invoices. Marketplace payouts that have never properly reconciled, which is where A2X mapped to Xero or QuickBooks earns its keep.

None of this needs a long project. It needs someone to open the numbers and tell you plainly what the current arrangement is doing to your margin.