The Self Assessment screen
What each figure means, every box on your tax return, what you will pay, and what the CSV and PDF exports contain.
Last checked 12/09/2026.
What it is
Your tax year summarised the way a tax return wants it: turnover, deductions, taxable profit, and the tax and National Insurance estimated on it. Under that, the whole return box by box and what you will pay.
The figures
| Line | What it is |
|---|---|
| Turnover | Everything the platforms paid you, including tips, across the tax year. |
| Mileage allowance | Your business miles at the approved rates, with the threshold applied. |
| Allowable expenses | Expenses in categories that reduce taxable profit. |
| Taxable profit | Turnover minus the two deductions above. |
| Income tax | Estimated on the profit, using the current bands. |
| Class 4 NI | Estimated on the profit. |
Fuel and vehicle insurance do not appear as deductions here. They are inside the mileage allowance, and deducting them again would be double-counting - see can I claim mileage and fuel.
With other income or a job
If you have logged other income, the screen carries on past the driving and works out your whole position, in the same order HMRC does:
| Line | What it is |
|---|---|
| Estimated tax on your driving | The income tax and Class 4 your driving adds, with the other income already underneath it. |
| Tax and Class 4 on all your income | Income tax on everything together, plus Class 4 on your trading profit only. Wages never pull driving profit into Class 4. |
| Less tax already deducted through PAYE | What your employer took off your payslips. A payslip refund shows as a plus instead. |
| Left to pay through Self Assessment | What is still owed once the PAYE tax is taken off. |
| Overpaid, HMRC owes you | Shown instead of the line above when PAYE took more than the year works out at. |
A PAYE entry saved before JoltMile asked for the tax deducted has no figure, so it is left out of the credit rather than guessed. The screen tells you how many there are. Open them under Other income and fill the figure in, or what is left to pay will read too high.
The CSV carries the same lines at the bottom, and the PDF explains them in its closing note.
The Class 2 decision
If your profit is under the Small Profits Threshold, a tick box asks whether you plan to pay voluntary Class 2 to protect your State Pension. The box comes first and the explanation sits behind the arrow beside it. Ticking it shows the yearly amount separately. It is never added to your tax, because Class 2 is not a tax charge.
Your tax return, box by box
Below the figures, the annual view walks the whole return in the order you need it. Every figure is in whole pounds, rounded the way HMRC allows: income down, expenses up.
| Section | What it gives you |
|---|---|
| Before you start | What to have ready: your UTR, your Government Gateway login, your platform statements, and a P60 for any job. |
| A few questions | The things JoltMile cannot see: whether you started this year, a student loan, payments on account you already made, a loss from an earlier year, and in a loss year whether to use that loss against your other income. Saved for that tax year only. |
| Self-employment (short) | Every box on the self-employment pages that applies to you, with a copy button. Turnover in box 9, your mileage claim and travel costs in box 12, the total in box 20, profit in boxes 21, 28 and 31. The boxes to leave blank are listed too. |
| Other parts of your return | The questions on page TR 2, an employment page for each job with pay and tax from the P60, the student loan boxes, and the questions only you can answer, like Child Benefit or pension payments. |
| What you will pay, and when | Income tax, Class 4, any student loan and voluntary Class 2, less PAYE tax and payments on account already made. Then the first payment on account for next year if your bill is £1,000 or more, and the total due on 31 January. |
| How to file | The steps on gov.uk, the payment reference to use, and how long to keep your records. |
If your real expenses come to less than £1,000, JoltMile uses the £1,000 trading allowance instead, because it is bigger. You get one or the other, and you can choose in the questions.
The tax in "What you will pay" is worked out on the profit you file, so it can differ from the estimate above it if you take the trading allowance or bring a loss forward. HMRC shows its own figure before you submit, and that is the one that counts.
A loss from driving this year is carried forward against future driving profit, on the estimate and on the return. If you have other income, such as a job, you can answer yes to "Use this year's loss against my other income" instead. The loss then goes in box 33 and the estimate takes it off your other income, so both say the same thing.
The exports
The CSV has one row per shift and a total, the rates and settings used, then every box on the return and what you will pay. Money in the box rows is in whole pounds with no symbol, so a spreadsheet reads it as a number. The PDF has the summary on the first page, then the return box by box, the bill, the checklist and the filing steps.
Neither is a tax return. JoltMile does not submit anything to HMRC; you or your accountant file using these figures.
Before you rely on it
- Check every shift is logged, including any you meant to add later.
- Check your mileage rates match HMRC's current approved rates.
- Add any income from outside the driving under Other income. A PAYE job changes the tax, not the profit, and the screen can only credit PAYE tax it has been told about.
- Check the PAYE tax you entered against your P60 before you rely on a refund.
- Keep your records for at least 5 years after the January filing deadline.
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