Self Assessment July 31 Deadline: A Checklist for Limited Company Driver-Directors

If you moved your driving work into a limited company part-way through the tax year, the Self Assessment July 31 deadline can still ask you for a payment based on your old sole trader profits. HMRC works out the 31 July 2027 instalment from your 2025/26 bill, so it reflects a business you may no longer run.

This checklist is for driver-directors in that changeover year. It shows you how to rebuild a fair estimate from three parts: your final self-employed profit, your director's salary taxed through payroll, and your dividends, which are not taxed through PAYE (Pay As You Earn). It then helps you choose between reducing the payment, paying it in full, or paying now and claiming back later.

It does not repeat ground covered elsewhere on this site. For the full personal return, read our step-by-step Self Assessment guide for limited company director drivers. If you are still deciding whether to incorporate, start with our sole trader versus limited company comparison. If you also have subcontract or rental income, see our 31 July deadline CIS guide and our 31 July steps for landlord drivers.

Key takeaways

• Your payments on account (POA) for 2026/27 are normally half of your 2025/26 bill, even if you became a company director during 2026/27.
• Build a fresh 2026/27 estimate from final sole trader profit, PAYE salary and dividends. Leave the company's own profit out.
• You can reduce online or with form SA303, but if you cut too far HMRC charges interest from the original due dates.
• Dividends are not taxed through payroll, so payments on account often continue into your first full year as a director.
• The second 2026/27 instalment is due by 31 July 2027, which falls on a Saturday, so plan to pay in the week before.

What is the Self Assessment July 31 deadline for a driver-director?

The Self Assessment July 31 deadline is when your second payment on account is due. For a driver-director, it is an advance towards your personal Income Tax for the current year, usually half of last year's bill. It covers tax on your own salary, dividends and any final self-employed profit, not your company's tax.

For the 2026/27 tax year, which runs from 6 April 2026 to 5 April 2027, the first instalment is due by 31 January 2027 and the second by 31 July 2027. Any balance, or any refund, is settled once you file the 2026/27 return, with the balancing payment due by 31 January 2028.

Why is your 31 July payment still based on sole trader profits?

HMRC sets payments on account from the last return it holds, not from your current income. If your 2025/26 return showed a full year of self-employed driving profit, both 2026/27 instalments are half of that bill. Incorporating does not reset them. Only a claim to reduce, or your 2026/27 return, changes the figure.

That works well when income is steady. It works less well in a changeover year. From the day your company starts trading, the fares from your driver app belong to the company, not to you. Your personal income becomes a smaller sole trader profit for the months before incorporation, plus whatever the company pays you.

The result can go either way. Many drivers find the new mix gives a lower personal bill in the changeover year, because some profit now stays inside the company. Others take large dividends early and end up owing more than before. The only way to know is to work the numbers, which the rest of this guide helps you do.

Which payments fall due in the changeover year?

If you incorporated during 2026/27, four Self Assessment dates matter. You pay your 2025/26 balance and first 2026/27 instalment by 31 January 2027, the second 2026/27 instalment by 31 July 2027, then the 2026/27 balance and first 2027/28 instalment by 31 January 2028, and the second 2027/28 instalment by 31 July 2028.

Our key tax dates for ride-hailing drivers sets out the wider calendar, including the 5 October registration date and the 31 January online filing deadline.

Do you have to make payments on account as a company director?

Usually, yes, if you take dividends. According to GOV.UK's guidance on payments on account, you do not need to make them if last year's bill was less than £1,000, or if you paid more than 80% of last year's tax outside Self Assessment, for example through PAYE. Directors on a low salary rarely pass the 80% test.

How the 80% test works for a driver on a low salary

PAYE tax deducted from your director's salary counts as tax collected at source. Many driver-directors set their salary around the Personal Allowance, which is £12,570 for 2026/27 according to GOV.UK's Income Tax rates page. On that pattern, little or no tax is deducted through payroll. Almost all the tax on your dividends then falls to Self Assessment, so the 80% exemption does not apply.

The test always looks back one year. Your 2026/27 instalments depend on how your 2025/26 bill was paid, and your 2027/28 instalments depend on 2026/27. A changeover year can therefore give a different answer for each year. Re-run both tests every time a return is filed.

How do you estimate your 2026/27 tax after incorporating?

Add up three personal income streams for 2026/27: your final sole trader profit up to the date you stopped, your director's salary, and the dividends paid to you. Work out Income Tax and Class 4 National Insurance on that total, take off any PAYE already deducted, and halve the result to get each instalment.

Part 1: your final sole trader profit

Your self-employment ends on the day the company takes over the driving. You must tell HMRC that you have stopped trading as a sole trader, and your 2026/27 return will show your final profit. That profit covers fares and allowable expenses from 6 April 2026 up to the cessation date.

Class 4 National Insurance still applies to that part-year profit. For 2026/27, GOV.UK's self-employed National Insurance rates show 6% on profits between £12,570 and £50,270, and 2% above that. Keep a clean cut-off: mileage, fuel and fares after the cessation date belong to the company. Our bookkeeping service can split the year for you.

Part 2: your director's salary

Salary is taxed through the company payroll, and the PAYE deducted is credited against your Self Assessment bill. Ask for your payroll year-to-date figures now, and your P60 after 5 April 2027. If you are running payroll for the first time, our payroll service handles director payroll on a fixed fee.

Part 3: your dividends

Dividends are paid out of company profit after Corporation Tax and are not taxed through PAYE. GOV.UK's tax on dividends guidance gives a £500 dividend allowance for 2026/27, then rates of 10.75% (basic rate), 35.75% (higher rate) and 39.35% (additional rate). If you send a Self Assessment return, you report your dividends on it.

Count only dividends actually declared and paid to you between the incorporation date and 5 April 2027. Agree any further dividends before you finalise the estimate. A large dividend in March 2027 can push your real bill well above a reduced figure.

What to leave out: the company's own profit

Money that stays in the company is not your personal income. The company pays its own Corporation Tax on its own timetable, separate from your Self Assessment. Do not add company profit to your estimate. Do not pay your personal 31 July bill from company funds either, unless the money is formally paid to you as salary or dividend, or recorded on your director's loan account.

Illustrative example: a driver-director who incorporated on 1 October 2026

This illustrative example uses invented figures. Arun drives private hire in England. He traded as a sole trader throughout 2025/26, and his 2025/26 Self Assessment bill was £6,800, all Income Tax and Class 4 National Insurance. He set up a limited company that took over his driving from 1 October 2026.

Without a claim, HMRC will ask Arun for £3,400 on 31 January 2027 and another £3,400 at the Self Assessment July 31 deadline in 2027. His own estimate for 2026/27 looks like this.

Arun's fair instalment is about £1,947, not £3,400. A claim before 31 January 2027 lowers both instalments and keeps about £2,907 in his pocket across the two dates. If he does nothing, he gets the excess back only after he files his 2026/27 return.

Now suppose Arun cuts each payment to £1,000 because he expects little dividend income, then pays himself the £10,000 anyway. His bill is still £3,893.05, so each instalment was £946.53 short. At the 7.75% rate in force when we checked, interest from 31 January 2027 and 31 July 2027 to a 31 January 2028 settlement comes to roughly £110. That is not ruinous, but it is avoidable.

His 2027/28 instalments will then be based on the £3,893 bill. Because his salary carries no PAYE, the 80% exemption will not apply, so payments on account continue into his first full year as a director.

How do you reduce payments on account online or with SA303?

Sign in to your HMRC online account, open your latest Self Assessment return and choose to reduce payments on account, entering the total you expect to owe. Or use form SA303. GOV.UK's SA303 page lists falling business profits as a valid reason and says claims must be made by 31 January after the tax year ends.

1. Finish your estimate first, using the three parts above, and keep the working with your records.
2. Sign in to your HMRC online account and open your latest Self Assessment return, which for this claim is 2025/26.
3. Choose the option to reduce payments on account and enter your expected 2026/27 total, not the instalment.
4. Give the reason. For a changeover year, the closest SA303 reason is that your business profits or other income have gone down.
5. Check your statement a few days later. Both 2026/27 instalments should show the new figure.
6. If you prefer paper, complete form SA303 on screen, print it and post it to HMRC. The form cannot be saved part-way, so gather your figures before you start.
7. Put a review in your diary for late June 2027, before the 31 July payment, in case dividends or salary have changed.

You enter one figure for the whole year. HMRC halves it and resets both instalments. If you have already paid the January instalment in full, the reduction can leave you in credit, which you can ask HMRC to repay or leave against the July payment. Check how this appears on your own statement before relying on it.

What happens if you reduce payments on account too far?

If your final bill is higher than the reduced instalments, HMRC charges interest on the shortfall from each original due date until you pay. If a claim includes an incorrect statement made fraudulently or negligently, the law also allows a penalty of up to the tax that went unpaid because of it. Careful, written estimates keep both risks low.

GOV.UK says that if your bill turns out higher, you will be charged interest on the difference. HMRC's late payment interest rates page showed 7.75% a year from 9 January 2026 when we checked. The rate is linked to the Bank of England base rate, so check it again when you decide.

The penalty rule sits in section 59A of the Taxes Management Act 1970. It targets incorrect statements made fraudulently or negligently, not honest estimates that turn out slightly wrong. HMRC's own manual also explains that interest is limited to what you should have paid, which can never exceed half of the previous year's bill for each instalment.

A written estimate built from payroll records and dividend paperwork is your best evidence that the claim was made with care. Keep it with your tax records for the year, and update it before each Self Assessment July 31 deadline.

Reduce, pay in full, or pay and claim back: which suits you?

Reduce when your estimate is solid and clearly lower than last year. Pay in full when your estimate is close to last year's bill or your dividend plans are still open. Pay and claim back when you want no interest risk, expect a lower bill, and can wait for the overpayment to return after you file or claim.

If cash is the real problem, our 31 July HMRC support FAQ covers payment plans and late payment. If you missed an earlier instalment, our bookkeeping recovery plan for a missed 31 July payment shows how to test what you paid.

The driver-director's checklist for the Self Assessment July 31 deadline

Work through this list in June 2027, or now if the January 2027 payment is your next one. Each step uses paperwork you or your accountant should already hold.

1. Find the cessation date: the day your company took over the driving work. Confirm you told HMRC you had stopped trading as a sole trader.
2. Close the sole trader books at that date and work out your final profit, including mileage and running costs up to that day only.
3. Collect your payroll year-to-date figures and any PAYE deducted from your director's salary.
4. List every dividend paid to you since incorporation, with dividend vouchers and board minutes that match.
5. Ask whether any further dividends are planned before 5 April 2027 and add them to the estimate.
6. Calculate Income Tax, dividend tax and Class 4 National Insurance for 2026/27, then subtract PAYE. Our driver tax calculator gives a quick cross-check for the sole trader part.
7. Halve the result and compare it with the instalments on your HMRC statement.
8. Choose reduce, pay in full, or pay and claim back, using the decision table above.
9. If reducing, make the claim online or on form SA303 and keep a copy of your working.
10. Pay by 31 July 2027. As that date is a Saturday, pay a few working days early so the money reaches HMRC in time.
11. Check your director's loan account. If the company paid any personal tax for you, make sure it is recorded properly.
12. Diary the 2026/27 return and the 31 January 2028 balancing payment, and check whether 2027/28 instalments will apply.

Common mistakes at the 31 July deadline and what each can cost

• Leaving payments on account at the sole trader level. You overpay and wait months for the excess, which can squeeze cash flow in the company's first year.
• Counting the company's profit as personal income. The estimate becomes too high and you overpay for no reason.
• Forgetting dividends declared late in the tax year. The claim is too low and HMRC charges interest on the shortfall from the original due dates.
• Ignoring Class 4 National Insurance on the final sole trader profit. Even a small underestimate attracts interest.
• Paying personal tax from the company account without recording it. This can leave your director's loan account overdrawn, which has its own tax consequences, so ask your accountant first.
• Missing the payment altogether. Interest is charged from the due date until you pay, so a missed instalment costs more the longer it is left.

Key terms

• Payment on account (POA): an advance payment towards the current year's Self Assessment bill, usually half of last year's.
• Balancing payment: the difference between your actual bill and the payments on account already made, due by 31 January after the tax year.
• Cessation date: the day your sole trader business stopped, here the day the company took over.
• PAYE (Pay As You Earn): the system that deducts Income Tax and National Insurance from salary through payroll.
• Dividend: a payment of company profit to shareholders, taxed on you personally through Self Assessment.
• SA303: HMRC's form for claiming to reduce payments on account.
• UTR (Unique Taxpayer Reference): your personal Self Assessment reference, separate from your company's own reference.
• Director's loan account: the record of money moving between you and the company outside salary and dividends.

How UK Driver Accountants helps

We work only with drivers, on fixed fees from £20 a month, and we are independent of any ride-hailing app. Our limited company accounting service covers company accounts, director payroll, dividend paperwork and your personal Self Assessment return in one place. That means any claim to reduce uses the same figures as your company records.

In a changeover year we close your sole trader books, prepare the final self-employed figures and check your payments on account before each deadline. See our fixed-fee pricing for what each package includes.

The Self Assessment July 31 deadline does not have to be a guess in the year you incorporate. Build the estimate, choose your option and keep the working. If you would like a second pair of eyes, contact our driver tax team and we will review your payments on account with you.

Last reviewed 4 November 2026 by the UK Driver Accountants tax team

This guide is general information for UK drivers and is not personal tax advice. Your position depends on your own income, company and dates, so speak to a qualified accountant before claiming to reduce payments on account. If HMRC is already chasing a payment or penalty, professional representation is recommended.