Profit vs Turnover: The Difference (And Why It Changes Your Tax)
Quick Answer
Turnover is your total income before any deductions. Profit is what's left after you subtract your allowable business expenses. You pay tax on profit, not turnover. This one distinction can mean thousands of pounds difference in your tax bill.
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Why This Matters So Much
Many people new to self-employment assume they'll pay tax on everything they earn. That's not how it works.
HMRC taxes your profit—which is your income minus allowable business expenses. The more legitimate expenses you claim, the lower your taxable profit, and the less tax you pay.
Understanding this early can save you from:
- Overestimating your tax bill (and panicking)
- Underestimating it (and getting a shock in January)
- Missing out on legitimate deductions
Definitions Made Simple
Turnover (Gross Income)
This is the total amount invoiced or received before you deduct anything.
If you're a freelance designer who billed clients £45,000 in a year, your turnover is £45,000.
Profit (Net Income)
This is turnover minus allowable expenses.
If that same designer had £8,000 in business expenses (software, equipment, travel, etc.), their profit is £37,000.
Profit = Turnover − Expenses
£37,000 = £45,000 − £8,000
Taxable Profit
For most sole traders, taxable profit is simply your profit. This is the figure HMRC uses to calculate your Income Tax and National Insurance.
Worked Example: Why Expenses Change Everything
Alex is a freelance copywriter earning £3,000 per month.
Annual turnover: £36,000
Business expenses for the year:
| Expense | Amount |
|---|---|
| Home office (simplified) | £312 |
| Laptop | £800 |
| Software subscriptions | £600 |
| Phone (70% business) | £350 |
| Travel to clients | £500 |
| Professional insurance | £200 |
| Accounting software | £150 |
| Total | £2,912 |
Profit: £36,000 − £2,912 = £33,088
Without claiming expenses, Alex would pay tax on £36,000. By tracking everything, they've reduced their taxable income by nearly £3,000—saving roughly £600–£800 in tax and NI.
What Counts as an Allowable Expense?
To reduce your profit, the expense must be:
- Wholly and exclusively for business purposes, OR
- A proportionate share of something used partly for business
Common categories:
- Equipment and tools
- Software and subscriptions
- Travel (not commuting)
- Phone and internet (business portion)
- Home office costs
- Professional services
- Marketing and advertising
For a complete list, see our allowable expenses guide.
What DOESN'T Reduce Your Profit
Some things people assume are deductible—but aren't:
- Personal living expenses
- Regular clothing (even if you wear it for work)
- Fines and penalties
- Client entertaining
- Your own "salary" (that's called drawings—you're taxed on profit instead)
How This Affects Your Tax Bill
Your tax is calculated in stages:
- Calculate profit (turnover − expenses)
- Subtract the Personal Allowance (£12,570 for most people)
- Pay Income Tax on the remainder at the appropriate rate(s)
- Pay National Insurance on profits above the threshold
The lower your profit, the less you owe at every stage.
Example comparison:
| Scenario | Turnover | Expenses | Profit | Approx Tax + NI |
|---|---|---|---|---|
| No expenses claimed | £40,000 | £0 | £40,000 | ~£7,000 |
| Expenses claimed | £40,000 | £6,000 | £34,000 | ~£5,400 |
That's a potential saving of £1,600 just by tracking what you're entitled to.
How to Calculate Your Profit
- Add up all income received in the tax year (6 April – 5 April)
- List all allowable expenses with evidence
- Subtract expenses from income
- The result is your profit
Keep records of everything. HMRC can ask for evidence up to 5 years after the tax year.
For a systematic approach, see our record keeping guide.
Common Mistakes
1. Thinking you pay tax on turnover
This is the most expensive misunderstanding. You pay tax on profit—always track expenses.
2. Not keeping receipts
Without evidence, you can't claim the expense. Digital photos are fine, but you need something.
3. Forgetting about mixed-use items
If you use your phone 60% for business, claim 60%—not 0%, not 100%.
4. Missing obvious expenses
Software subscriptions, bank fees, professional memberships—small things add up.
5. Confusing revenue with cash in bank
Your turnover is what you invoiced, not necessarily what's in your account (some clients pay late).
FAQ
Do I pay tax on turnover or profit?
Profit. Turnover is your total income; profit is what's left after allowable expenses.
Is turnover the same as revenue?
Yes. Turnover, revenue, and gross income all mean the same thing for a sole trader.
What if I don't have many expenses?
You'll pay tax on most of your income. But check carefully—many people miss legitimate deductions like home office costs.
Does turnover include VAT?
If you're VAT-registered, your turnover figure for Self Assessment is usually net of VAT. If you're not VAT-registered, this doesn't apply.
How do I prove my expenses?
Keep receipts, bank statements, and invoices. Digital copies are accepted by HMRC.
What's the difference between gross and net?
Gross = before deductions (turnover). Net = after deductions (profit).
Can I reduce my profit by paying myself a salary?
No. Sole traders don't pay themselves a salary—you take "drawings." Your tax is based on profit, not what you withdraw.
What if my expenses are higher than my income?
That's a loss. You may be able to carry it forward or back to reduce other tax bills. See our loss guide.
Should I track profit monthly?
Yes, it helps with setting aside tax and avoiding surprises.
Does profit include NI contributions?
No. Profit is calculated before NI. Your NI is then calculated based on that profit.
Next Steps
Understanding profit vs turnover is the foundation of self-employed tax. Now make sure you're tracking all your expenses and setting aside the right amount.
Learn more about allowable expenses and how much to set aside for tax.
Back to the Learn hub.
This guide is for general information only. Tax rules change, and everyone's situation is different. Always check the latest HMRC guidance and consider speaking to a qualified accountant if you're unsure.