Self-employed tax
Estimate Income Tax and NI on your self-employed profit.
Open calculatorEnter your rateable value and see the 2026/27 bill, which multiplier applies, and whether small business rate relief wipes it out. England only — talk to Buzz about reliefs.

Enter your rateable value, then click Calculate to see the bill.
Business rates are calculated from the rateable value of your premises, set by the Valuation Office Agency, multiplied by a figure the government sets each year. Then reliefs come off. For a lot of small businesses the reliefs matter far more than the multiplier.
The 2026/27 multipliers, England. If your rateable value is below £51,000 you use the small business multiplier of 43.2p. At £51,000 or above you use the standard multiplier of 48p. So a £50,000 rateable value and a £52,000 one are not two per cent apart on the bill — they are on different multipliers entirely.
Small business rate relief. If the property is the only one your business uses and its rateable value is £12,000 or less, you pay nothing. Between £12,001 and £15,000 relief tapers from 100% down to zero — so at £13,500 you get roughly half off, and at £14,000 about a third.
The taper is why a small rise in rateable value can cost far more than it looks. Going from £12,000 to £13,500 does not add a little to your bill; it moves you from nothing to a real one.
Worth checking rather than assuming. Relief normally requires you to use only one property, but there are exceptions once you take on a second, including a grace period on the main one. Plenty of businesses that would qualify never claim.
Divide the gross figure by 1.20 for standard-rate VAT. £120 ÷ 1.20 = £100 net, so the VAT is £20. Taking 20% off £120 gives £96, which is wrong, and it is the most common VAT mistake in small business bookkeeping — it understates net sales and overstates the VAT by a few percent every time. For the reduced 5% rate, divide by 1.05. A useful shortcut for standard rate: the VAT in a gross figure is one sixth of it.
When your VAT-taxable turnover exceeds £90,000 in any rolling twelve-month period, or when you expect to exceed it within the next thirty days alone. The rolling test is the one that catches people: it is not your accounting year and not the calendar year, so you have to check it monthly. Registering late means HMRC can charge you the VAT you should have collected from the date you crossed the threshold — money you never took from your customers and generally cannot go back and ask for. Watch it every month.
It depends entirely on who your customers are. If they are mainly VAT-registered businesses, they reclaim the VAT anyway, so registering costs them nothing and lets you recover VAT on your own purchases and overheads — often worth several thousand pounds a year. If you sell to consumers or small unregistered businesses, registration effectively makes you 20% more expensive or cuts your margin by that much, and it is usually a poor idea. There is also the admin: quarterly returns, digital records and MTD obligations from day one.
A simplified scheme for businesses with turnover up to £150,000 excluding VAT, where you pay HMRC a fixed percentage of your gross turnover instead of tracking VAT on every purchase, and generally cannot reclaim input VAT except on capital assets over £2,000. It suits low-cost service businesses and penalises anyone who buys a lot. The limited cost trader rule pushes businesses spending little on goods onto a 16.5% rate, which removes most of the benefit. Run it both ways on your actual figures before joining — it is not a one-way saving.
It depends on what you sell, whether it is goods or services, whether the customer is a business or a consumer, and where they are. The general rule for business-to-business services is that the place of supply is where the customer belongs, so UK VAT is not charged and the reverse charge applies — but there are numerous exceptions, and digital services to consumers follow different rules again. Goods bring customs and, for Northern Ireland, the Windsor Framework. Getting it wrong is expensive to unwind, so check before assuming.
Correct it. Errors below the reporting threshold and not deliberate can usually be adjusted on your next return; larger or deliberate errors must be notified to HMRC separately on form VAT652. Unprompted disclosure attracts substantially lower penalties than an error HMRC finds itself, so the incentive is firmly on telling them first. Late returns and payments now work on a points-based system with separate late payment penalties and interest. The practical lesson is that a VAT mistake found and reported is a small problem, and the same mistake discovered in an inspection is not.
Estimate Income Tax and NI on your self-employed profit.
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Open calculatorIR35, capital gains, stamp duty and more.
Browse allStart with a single sale. You quote £1,000 for a job, exclusive of VAT.
Reverse it and the trap appears. If a customer agrees £1,200 including VAT, the net is £1,200 ÷ 1.20 = £1,000 and the VAT is £200. Taking 20% off £1,200 gives £960, which is £40 wrong on every invoice.
Now scale it to a quarter. A business invoices £42,000 net over three months and spends £12,900 including VAT on standard-rated costs.
Dividing a VAT-inclusive figure by 6 is the quick way to find the VAT inside it at 20%, which is worth remembering when you are checking a supplier invoice.
Late VAT returns now attract points rather than an automatic penalty, but the points accumulate and turn into a fine, and late payment carries interest separately. Our article on the real cost of late VAT returns covers how that works.








