It is the headline number every business quotes, and the one most often confused with profit. Knowing exactly what turnover includes decides your VAT position and your tax starting point.
When someone says their business "turned over six figures last year", it sounds impressive, but it answers a different question from "how much did you actually keep?". Turnover is the most quoted and most misunderstood number in business, and confusing it with profit can lead to overconfidence, underpriced work, and surprise tax positions.
Turnover is the total value of what your business sells through its normal trading activities over a period, usually a tax year, before you subtract a single cost. For a sole trader that means the full value of all invoices raised or sales made: every shoot fee, every product sold, every billable hour.
What it includes is the income from your core trade. What it excludes is anything that is not trading income, such as money you put into the business yourself, loans, or one-off sales of business assets (which are treated differently). It is the gross measure of business activity, distinct from your personal gross income, which can include earnings from other sources entirely.
This is where most confusion lives. Turnover is the money coming in; profit is what survives after the money going out. A consultant with £100,000 of turnover and £20,000 of costs has £80,000 of profit. A retailer with £100,000 of turnover but £85,000 of stock and overheads has just £15,000 of profit, despite identical turnover.
For tax, only profit matters. HMRC charges income tax and Class 4 National Insurance on a sole trader's profit, not their turnover. Two businesses with the same turnover can owe very different amounts of tax depending on their costs.
Even though you are taxed on profit, turnover carries its own legal weight because it determines VAT registration. In 2025/26 the VAT registration threshold is £90,000 of taxable turnover measured over any rolling 12-month period. Cross it, and you must register for VAT, add VAT to your prices, and file VAT returns, even if your profit is modest.
This is why a fast-growing sole trader needs to watch turnover closely: hitting £90,000 of sales changes your obligations regardless of how much you actually keep. The VAT threshold guide explains the registration rules and deadlines in detail.
Turnover is for vanity, profit is for sanity, and the tax bill cares only about the second one.
Hannah runs a self-employed catering business. Over a rolling 12-month period her turnover reaches £92,000, made up entirely of catering sales. Because this exceeds the £90,000 VAT threshold, she must register for VAT and start charging it.
Her costs (ingredients, equipment, staff, travel) come to £38,000, so her profit is £92,000 − £38,000 = £54,000. For income tax and National Insurance, HMRC looks at the £54,000 profit, not the £92,000 turnover. With profit above £50,270, a slice falls into the higher-rate band. Turnover decided her VAT obligation; profit decided her tax. You can estimate the tax on profit using the sole trader tax calculator.
Turnover also matters for Making Tax Digital: from April 2026, sole traders and landlords with qualifying income (broadly turnover) over £50,000 must keep digital records and submit quarterly updates to HMRC.
TapTax connects to your bank, categorises expenses automatically, and submits quarterly updates to HMRC. Free plan, no card required.
