Turnover, Profit & Income: Which Figure to Use
Before comparing results, check what the number represents and which period it covers. Different calculators deliberately use different income bases.
By SoloCalc · Content updated 23 October 2026
Turnover is not the amount you keep
Turnover describes business sales or income before expenses. Taxable profit reflects permitted deductions under the applicable tax rules. Personal drawings, loan proceeds and transfers between your own accounts should not be mistaken for new trading sales. Accounting profit and taxable profit can differ because not every cost has the same tax treatment.
HMRC's expenses guidance explains that eligible business costs reduce taxable profit. Cash-basis and traditional accounting have different timing rules; keep the period and accounting basis consistent rather than mixing invoices and bank receipts. Check HMRC's cash-basis guidance.
A computed sole-trader illustration
For 2026/27, England/Wales/Northern Ireland, a turnover of £40,000.00 with £8,000.00 allowable costs produces profit of £32,000.00. With no other income, pension or voluntary Class 2, this engine estimates £5,051.80 Income Tax and NI and £26,948.20 business take-home.
Those are three different numbers: sales, taxable profit and money after modelled personal tax. The results are generated by the tested tax calculator, not an HMRC assessment. Losses, reliefs, timing and other income can change the outcome.
Match the figure to the question
| Question | Starting figure | Common mistake |
|---|---|---|
| Tax and take-home | Full-year turnover and eligible expenses separately. | Entering net take-home as turnover or personal drawings as expenses. |
| Tax reserve | Consistent full-year forecast of turnover and expenses. | Applying a tax percentage to turnover without estimating profit. |
| VAT registration | VAT-taxable turnover over the relevant rolling or forward period. | Using profit, a tax-year-only total or assuming zero-rated sales are exempt. |
| MTD start date | Gross qualifying trade and property income for relevant return years. | Deducting expenses or including employment income in qualifying turnover. |
| CIS balance | Gross pay before CIS deductions; actual deductions entered separately. | Treating net bank receipts as gross income or withholding as final tax. |
| Freelance rate | Desired annual business take-home plus costs and billable time. | Confusing a gross salary target with business take-home. |
| Structure comparison | Business turnover and expenses before the owner's salary or dividends. | Subtracting salary once in expenses and again in the company model. |
| Rental tax | Your taxable share of rent, non-finance costs and finance costs separately. | Calling rent minus all mortgage payments taxable property profit. |
| Mortgage illustration | Evidenced annual income on a provider-appropriate basis. | Using business sales, unverified forecasts or double-counted SA302 totals. |
Gross income can mean different things
MTD qualifying income is a particular gross-income test, not every item on your return. VAT-taxable turnover has its own supply classifications and periods. Income Tax uses profit and other taxable income. A high-expense business can therefore have little taxable profit but still need to consider gross-income reporting or VAT tests.
CIS payments need special care: deductions withheld by contractors do not erase sales income. Enter gross pay before CIS, excluding output VAT where applicable, and reconcile actual tax-paid credits separately. Expense deductions for annual profit are not identical to the narrow costs excluded from contractor withholding.
Rental profit, finance costs and cash
For personally owned residential property, mortgage interest normally feeds a restricted tax reduction rather than reducing taxable profit. Capital repayments reduce available cash but are not allowable rental expenses. A cash shortfall is not automatically a tax loss; the landlord tool explains its cash-flow exclusions.
Evidence for a mortgage is not a tax formula
For a sole trader or partner, use the evidenced income or allocated share the provider asks for. For a company director, the SoloCalc illustration uses personal salary plus dividends, not company turnover or retained profits. A provider may assess a different basis, and expenditure and other circumstances also matter.
Our SA302 and tax-year overview checklist helps prepare documents. Neither that guide nor the mortgage calculator establishes eligibility or approval.
A final consistency check
- Use the same year and annual/rolling period for comparable inputs.
- Keep costs and VAT on the basis required by the selected tool.
- Do not count income twice when combining sources or copying a total.
- Do not add tax totals from separate calculators without checking their overlapping other-income assumptions.
- Use real records for filing and invented examples for reporting a site issue.
For reserve planning read how to plan money for tax. For implementation limits read our methodology.
Official sources and scope
- GOV.UK: self-employed allowable expenses
- GOV.UK: business records
- GOV.UK: VAT turnover
- HMRC: MTD eligibility
- GOV.UK: SA302 evidence
General information only, not tax, accounting, legal or regulated financial advice. This guide helps choose inputs; it does not classify every receipt, expense or provider requirement.