Self Assessment Tax Return in Leeds: Your Questions Answered
A self assessment tax return can usually be corrected online within 12 months of the 31 January deadline, and a bill you cannot pay can often go on a payment plan. This Leeds FAQ explains amending, payments on account, refunds and your SA302 after you file.
Published 9 November 2026 · Updated 9 November 2026
A Self Assessment tax return is not finished the moment you press submit. If you find a mistake, owe more than you expected or cannot pay on 31 January, you can usually put it right, and this guide shows how. It covers the questions Leeds drivers ask after filing, using GOV.UK rules for the 2025/26 return that is due by 31 January 2027.
Most guides stop at the filing button. Real life carries on: a bill lands, HMRC (HM Revenue and Customs) asks for payments on account, a figure looks wrong on the tax calculation, or the money simply is not in the bank. We wrote this for drivers across Leeds, from Headingley to Hunslet, who want plain answers and a clear order of play. It sits alongside our Leeds accountancy support for drivers page.
If you still need to build your records or your first return, start with our Self Assessment bookkeeping records guide instead. This article picks up where that one ends.
Key takeaways
- You can usually correct a filed online return within 12 months of the 31 January deadline, but check GOV.UK for your exact date.
- Payments on account are advance payments towards next year's bill. They are normally two instalments, due 31 January and 31 July.
- If you cannot pay on time, ask about a payment plan early. Silence costs more than a conversation.
- Your tax calculation (SA302) is a printable summary of how HMRC reached your bill. Learn to read four numbers and you can spot most errors.
- Late-payment penalties and interest build up over time, so acting in week one beats acting in month six.
What is a Self Assessment tax return?
A Self Assessment tax return is the form you use to report income that is not taxed at source, such as self-employed driving profit. HMRC uses it to calculate your Income Tax and Class 4 National Insurance. For 2025/26, online returns and payment are due by 31 January 2027, and you register by 5 October if you are new.
Can I correct my tax return after I have filed it?
Yes, usually. According to GOV.UK's guidance on correcting a Self Assessment return, you can amend an online return within 12 months of the filing deadline. You normally wait 72 hours after submitting, then reopen the return in your HMRC online account and file it again.
For the 2025/26 return, that 12-month window should run to 31 January 2028, but check GOV.UK for the date that applies to you. The calculation updates straight away if you amend online, and a revised statement follows within a few days.
A common reason to amend is a missed expense, a mileage figure typed in the wrong box, or income entered in the wrong year. Before you change anything, keep a copy of the original and write down what changed and why. If an accountant filed for you, ask them to make the amendment, because commercial software and HMRC's own service can show different versions.
What if the 12-month window has passed?
After the window closes you cannot simply reopen the return. GOV.UK says you write to HMRC instead and may be able to claim overpayment relief for up to four years after the end of the tax year. The claim needs specific details and a signed declaration from you, which a tax agent cannot sign on your behalf.
Because this route is slower and more formal, it is worth reviewing your return within a few weeks of filing. A second look while your bank statements are still fresh in your mind catches most slips. Our guide above explains what to keep.
What does HMRC do with my payments on account?
HMRC treats payments on account as advance payments towards your next Self Assessment bill. They are normally two instalments, each about half of last year's bill, due on 31 January and 31 July. Any difference between those payments and your real bill is settled in the following balancing payment.
The payments on account guidance on GOV.UK explains that you do not make them if last year's bill was under £1,000, or if more than 80% of last year's tax was already paid elsewhere, for example through your tax code. Self-employed drivers with a steady profit often find these rules do not apply, so expect to make them.
The first instalment lands in the same week as your balancing payment. That is why a January bill can feel like paying for two years at once. In truth, you are paying the balance of the year you just filed plus a down payment on the next one.
Can I reduce my payments on account?
If you expect your profit to fall, you can ask HMRC to reduce the payments. GOV.UK says you can do this online by opening your latest return and choosing the option to reduce payments on account, or by post with form SA303. Give a realistic figure, because underpaying leads to interest on the shortfall.
Reductions suit drivers whose year changed: a long illness, a car off the road, fewer hours after taking a second job. They are not a way to defer tax. If your final bill turns out higher than the figure you gave, HMRC charges interest on the gap, so be conservative.
Illustrative example: how a January bill is built
This is an illustrative example using an invented driver. It shows how one bill splits into a balancing payment and a payment on account. The numbers are made up to show the maths and are not typical for any real driver.
| Item | Amount | How it works |
|---|---|---|
| 2025/26 total bill (Income Tax plus Class 4 NIC) | £4,200 | Calculated from your return |
| Payments on account already made for 2025/26 | £3,600 | Two payments of £1,800 (31 Jan and 31 Jul) |
| Balancing payment due 31 January 2027 | £600 | £4,200 minus £3,600 |
| First payment on account for 2026/27 | £2,100 | Half of the £4,200 bill |
| Total due 31 January 2027 | £2,700 | £600 plus £2,100 |
| Second payment on account for 2026/27 | £2,100 | Due 31 July 2027 |
Notice the January figure is £2,700 even though the driver's balancing payment is only £600. Setting aside money each month into a separate savings pot makes that January cheque far less of a shock. Use our tax calculator to estimate your own bill before the deadline.
What if I cannot pay my Self Assessment bill on 31 January?
Contact HMRC as early as possible and ask about a payment plan. GOV.UK says you may be able to set up a plan online to pay an overdue bill in monthly instalments. You will need your UTR (Unique Taxpayer Reference), UK bank details for a Direct Debit, and details of your income and spending.
The HMRC payment plan page adds that HMRC expects you to use savings or assets first to reduce the debt. If your bill is not yet overdue, a Budget Payment Plan may let you pay weekly or monthly towards your next bill instead. Check GOV.UK for eligibility, as the online service tests it.
A plan does not wipe out interest, so ask the service what the total cost would be. Missing the 31 January payment still starts the late-payment clock. According to GOV.UK's penalty guidance, late-payment penalties apply at 30 days, six months and twelve months, plus interest, so earlier contact is cheaper.
Step by step: what to do if the money is not there
- Check your exact bill in your HMRC online account, including any payments on account.
- Pay whatever you can by 31 January, even if it is only part. Anything paid reduces what penalties and interest are based on.
- Gather your UTR, bank details and a simple list of monthly income and outgoings.
- Use the online payment plan service on GOV.UK, or contact HMRC if it will not accept your case.
- Set up the Direct Debit and put the monthly amounts in your diary and your bank balance.
- Keep paying new bills on time. A plan only covers the debt you have agreed.
How do I read my tax calculation (SA302)?
Your SA302 is HMRC's tax calculation for a tax year. Read four things in order: your total income, your self-employment profit, the tax and Class 4 National Insurance due, and the payments on account shown. If those four match your records, the calculation is probably right.
You can usually print an SA302 from your HMRC online account after filing, and you normally wait about 72 hours after submitting. If your accountant used commercial software, the document may be called a tax computation. Check GOV.UK for the current steps and for how many past years are available.
Lenders often ask for an SA302 alongside a tax year overview when you apply for a mortgage or loan. They are different documents. The SA302 shows how the tax was worked out, and the overview summarises what was charged and paid. If you amend the return, print them again so both match.
A quick reading checklist
- Check your name, UTR and tax year at the top.
- Compare the self-employment profit with your own accounts. This is the figure lenders look at first.
- Look for any income you forgot, such as bank interest or a second job.
- Check the Income Tax and Class 4 National Insurance totals add up to the bill.
- Look at the payments on account section. This tells you what is due next.
Can I get a refund if I overpaid?
Yes, it can happen. If your payments on account were higher than your final bill, the credit sits on your Self Assessment account. You can usually ask for it back, or leave it to offset your next bill. Check GOV.UK for how to request a repayment, because HMRC's steps and timings change.
GOV.UK's overpayments and underpayments overview confirms that if you are registered for Self Assessment, your bill is adjusted automatically, and you will not get the tax calculation or Simple Assessment letters that PAYE (Pay As You Earn) taxpayers receive. Your online statement is the place to look.
Do not assume a refund appears by itself. Look at your statement a few days after filing and again after 31 January. If a credit shows and you want the cash, follow the GOV.UK steps for requesting a repayment, and make sure your bank details held by HMRC are up to date.
What happens next after I file? A timeline table
After you file, HMRC processes the return, updates your statement, and waits for payment. The table below sets out what usually follows from each situation, what you do, and where to check. Treat the timings as a guide and confirm the details on GOV.UK for your own case.
| Situation | What you do | What HMRC does | Where to check |
|---|---|---|---|
| You spot a mistake within 12 months of the deadline | Wait about 72 hours, then amend online | Recalculates your bill and shows a revised statement | HMRC online account and GOV.UK corrections page |
| You spot a mistake after the window closes | Write to HMRC to claim overpayment relief | Reviews your claim and may adjust your bill | GOV.UK overpayment relief guidance |
| Your bill is higher than expected | Check the calculation, then pay or ask for a plan | Charges interest and penalties if you pay late | Statement and penalty pages on GOV.UK |
| Your payments on account were too high | Check your statement for a credit and request repayment if wanted | Shows the overpayment on your account | HMRC online account and GOV.UK refund pages |
| You expect lower profit next year | Ask to reduce payments on account | Revises the instalments, charges interest if your estimate is too low | Reduce payments option or form SA303 |
| You cannot pay in full by 31 January | Pay what you can and set up a plan | Assesses affordability, may agree monthly instalments | GOV.UK payment plan service |
| A lender wants proof of income | Print the SA302 and tax year overview | Provides both after processing the return | HMRC online account |
Is the Self Assessment deadline different for Leeds drivers?
No. The deadlines are national, so Leeds drivers follow the same dates as everyone else. For the 2025/26 year, online filing and payment are due by midnight on 31 January 2027, and new taxpayers register by 5 October. What differs locally is the practical side: your licensing costs and vehicle records.
Drivers licensed by Leeds City Council should keep their licence fees, vehicle test costs and insurance invoices in the same folder as the rest of their evidence. For help with your wider Leeds tax picture, see our Leeds taxi driver accountant guide, and our year-end checklist for Leeds drivers.
Night drivers should check the mileage rules in our Leeds night-driver mileage guide. If your turnover is climbing, our articles on the VAT threshold for Leeds drivers and the monthly VAT tracker will help you watch the £90,000 registration line.
Comparison: ways to fix a problem after filing
Different problems need different routes. The table compares the three most common ways to deal with an issue after filing, so you can see which one fits your situation before you contact HMRC.
| Route | Best for | Time limit (check GOV.UK) | Watch out for |
|---|---|---|---|
| Amend online | Wrong figures or missed expenses | Usually 12 months after the filing deadline | Wait about 72 hours after filing first |
| Overpayment relief claim by post | Errors found after the amendment window closed | Up to four years after the tax year ends | Needs details and your own signed declaration |
| Reduce payments on account | Expected fall in next year profit | Before the instalment is due | Interest on any shortfall if you reduce too far |
What are the common mistakes after filing, and what do they cost?
The most common mistakes are ignoring the bill, assuming HMRC will chase you gently, and amending without checking. Each can trigger a penalty or interest. According to GOV.UK, late filing starts at £100 and late payment adds 5% charges at 30 days, six months and twelve months.
- Ignoring a bill you cannot pay: late-payment penalties and interest build up, so contact HMRC early.
- Filing late: GOV.UK sets out a £100 initial penalty, with daily and percentage charges following if the return stays outstanding. Check the penalty page for the full scale.
- Reducing payments on account too far: you pay interest on the shortfall once the real bill is known.
- Amending the wrong year: this can create a new mismatch and a fresh bill, so double-check the tax year before you resubmit.
- Leaving it too late to claim: the 12-month window is short, and the later route needs a signed declaration.
- Mixing business and private spending: records become hard to defend if HMRC ever asks questions.
Illustrative example: correcting a missed expense
This is another illustrative example, using an invented driver. They file their return in early December and later find a vehicle insurance invoice they forgot to enter. Because they are inside the 12-month window, they wait 72 hours, reopen the return online, add the cost and resubmit.
The online calculation updates straight away, and the bill reduces by the extra tax saved. Their payments on account for the next year may also change, because those are based on the bill. They check their statement within a few days, note the revised figure, and file the evidence with the rest of their records.
How UK Driver Accountants helps
UK Driver Accountants works for drivers only, on fixed fees from £20 a month, and we are independent of any ride-hailing app. We can review a filed return, prepare an amendment, explain a tax calculation line by line, or help you speak to HMRC about a payment plan.
Our personal tax service covers the whole Self Assessment cycle. If you are already in a dispute or struggling with a debt, our HMRC support service can help you prepare. You can see the monthly fee on our pricing page.
Key terms
- UTR: Unique Taxpayer Reference, the 10-digit number that identifies you to HMRC for Self Assessment.
- Payment on account: an advance payment towards next year's bill, normally two instalments a year.
- Balancing payment: the difference between your final bill and the payments on account you made.
- SA302: HMRC's tax calculation for a year, often used as proof of income.
- Class 4 NIC: the National Insurance (NIC) that self-employed people pay on profits.
- Time to pay: an arrangement with HMRC to pay a tax debt in instalments.
Conclusion
Filing is the middle of the tax year, not the end of it. Check your calculation, diarise 31 January and 31 July, and act fast if something looks wrong or the money is short. If you would like a second pair of eyes, get in touch and we will explain your options in plain English.
Last reviewed 9 November 2026 by the UK Driver Accountants tax team.
This article is general information and is not personal tax advice. Speak to a qualified accountant about your own circumstances. If HMRC is disputing a figure or has charged a penalty, professional representation is recommended.
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