Self Assessment July 31 Deadline: Your HMRC Questions Answered for Drivers

The Self Assessment July 31 deadline is the date your second payment on account is due to HMRC, usually half of last year's tax bill. If you cannot pay it, think it is too high, or have already missed it, you still have options: reduce it, set up a payment plan, or pay what you can to cut interest.

This Self Assessment July 31 deadline FAQ is written for ride-hailing, private hire and taxi drivers who are dealing with HMRC after the 31 July payment has gone wrong. It covers the letters and statements that follow, how late payment interest and penalties really work, and when it is worth getting someone to speak to HMRC for you.

Key takeaways

• The 31 July payment is your second payment on account: an advance towards the current year's tax, normally half of last year's bill.
• Missing the Self Assessment July 31 deadline triggers late payment interest from 1 August, currently set at the Bank of England base rate plus 4%.
• A 5% penalty only arises if the money is still unpaid more than 30 days after the next 31 January, so there is time to fix it.
• If your profit has fallen, you can reduce payments on account online or with form SA303, but under-reducing costs interest.
• If you cannot pay, HMRC's online payment plan covers Self Assessment debts of £30,000 or less if you meet its conditions.

What is the Self Assessment July 31 deadline?

The Self Assessment July 31 deadline is the midnight cut-off for your second payment on account. A payment on account (POA) is an advance payment towards your next tax bill, including Class 4 National Insurance contributions (NIC). Each one is usually half of the previous year's Self Assessment bill.

According to HMRC's guidance on payments on account, these payments are due by midnight on 31 January and 31 July. For the 2026/27 tax year, the first instalment is due on 31 January 2027 and the second on 31 July 2027. Any balance left after that is paid on 31 January 2028.

This guide is deliberately narrow. If you are a courier or driver with CIS deductions, read our 31 July deadline guide for CIS clients. If you also let a property, our 31 July steps for landlord drivers explains how rental profit changes the figure. For the full calendar, see our key tax dates for ride-hailing drivers.

Who has to pay on 31 July, and who does not?

You pay on 31 July if HMRC has set payments on account for you. You do not need them if the tax you owed last year was less than £1,000, or if more than 80% of last year's tax was collected outside Self Assessment, for example through a tax code from a part-time employed job.

Most full-time drivers are self-employed, with no employer taking tax off their earnings. That is why so many drivers cross the £1,000 line in their second or third year of driving. The first year is often the shock: HMRC's guidance shows you then pay the full year's bill plus your first payment on account on the same 31 January, with the second instalment following on 31 July.

How do I check what I owe in my HMRC online account or app?

Sign in to your HMRC online account or the HMRC app and open your Self Assessment statement. It lists each charge, the due date and any payments received. Check the 31 July line before paying, because the amount there is what HMRC expects, not necessarily what you will finally owe.

When you look at the statement, check four things. Is the amount half of last year's bill? Has any earlier payment been allocated to the right year? Is there interest already showing? Is there a balance from a previous year that you had forgotten? Our guide to what drivers can do in the HMRC online account walks through the screens in more detail.

When you pay, use your 11-character payment reference: your 10-digit Unique Taxpayer Reference (UTR) followed by the letter K. HMRC warns that using the wrong reference can delay a payment or send it to a different tax bill. That one mistake is behind a lot of the confusing statements drivers bring to us.

What should I do if I cannot pay the 31 July payment?

Do not ignore it. Pay whatever you can by 31 July, then set up a payment plan for the rest, ideally online and before the debt grows. Interest runs on the unpaid part from 1 August, so even a partial payment lowers the cost. Ignoring HMRC letters makes every option harder.

Before you assume you cannot pay, ask whether the payment should be that high at all. If your fares dropped, your car was off the road, or you moved to part-time driving, your 2026/27 profit may be well below last year's. In that case reducing the payment on account, covered below, may solve the problem without a payment plan.

Your three realistic options

• Reduce the payment on account if you have good evidence that this year's profit will be lower.
• Set up a Time to Pay arrangement if the amount is right but you cannot pay it in one go.
• Pay part now and the rest as soon as possible if the shortfall is small and short term, accepting some interest.

How does a Time to Pay arrangement work for Self Assessment?

A Time to Pay arrangement, also called a payment plan, lets you clear an overdue tax bill in monthly instalments by Direct Debit. HMRC checks the plan is affordable. Interest is still charged at the Bank of England base rate plus 4%, but you avoid one large payment and keep the debt under control.

According to HMRC's online Self Assessment payment plan service, you can set up a plan yourself if you meet all of these conditions:

• you are up to date with your tax returns
• you owe £30,000 or less
• you have no other tax debts
• you have no other HMRC payment plans set up
• you can authorise a Direct Debit from a UK bank account in your name without another account holder's signature

If you do not meet those conditions, HMRC asks you to phone to see whether a plan can be agreed. Expect questions about your income, your usual monthly spending, any savings, and other taxes you owe. HMRC expects savings or assets to be used to reduce the debt where possible. Staying up to date with the instalments matters, because HMRC can ask for the full amount if you fall behind.

Budget Payment Plan versus Time to Pay

These are different tools. A Budget Payment Plan is for people who are up to date and want to save towards the next bill by weekly or monthly Direct Debit, according to HMRC's guide to paying your Self Assessment tax bill. Time to Pay is for a bill that is already overdue or that you cannot pay. Once you are back on track, a Budget Payment Plan is the best way to stop next July happening again.

How do I set up a Self Assessment payment plan, step by step?

Check your statement, decide what you can genuinely afford each month, then use HMRC's online payment plan service if you are eligible. You need your UTR, your UK bank details and a clear picture of your income and spending. The whole process usually takes less than half an hour.

1. Sign in to your HMRC online account and confirm the exact amount overdue, including any interest already added.
2. Check that every tax return due has been filed. An unfiled return blocks the online service.
3. Work out your monthly take-home from driving after fuel, insurance, vehicle and living costs, so the instalment is realistic.
4. Pay any lump sum you can afford first, because it reduces the balance that interest runs on.
5. Use the online payment plan service if you owe £30,000 or less and meet the other conditions; otherwise phone HMRC.
6. Set up the Direct Debit from a UK account in your name and keep the confirmation.
7. Put money aside for your next 31 January payment at the same time, so a new debt does not overlap the plan.

What if I think my 31 July payment is too high?

If you expect this year's tax to be lower than last year's, you can ask HMRC to reduce your payments on account. Do it online through your Self Assessment account, or post form SA303 with the amount you expect to owe. HMRC then recalculates both instalments for the year.

HMRC publishes form SA303 on GOV.UK for postal claims. You do not need to send evidence with the claim. That makes it easy, but it also makes it easy to get wrong, which is the trap explained in the warning below.

Good reasons drivers reduce payments on account

• Your car was off the road for weeks after an accident or a failed licensing inspection.
• You cut your hours because of illness, caring duties or a new part-time job taxed through PAYE.
• Last year included a one-off, such as a large rental profit or a gain that will not repeat.
• Your allowable expenses rose sharply, for example a new vehicle or a jump in insurance.

What happens if I miss the Self Assessment July 31 deadline?

HMRC starts charging late payment interest on the unpaid amount from 1 August. There is no fixed fine on 1 August itself. A 5% late payment penalty only follows if a payment on account or balancing payment is still unpaid more than 30 days after the next 31 January balancing payment date.

According to HMRC's table of interest rates for late and early payments, late payment interest has been set at the Bank of England base rate plus 4% since 6 April 2025. At the time of writing the table shows 7.75% a year from 9 January 2026. The rate moves with the base rate, so check the table on the day you calculate.

The penalty rule is where many guides go wrong. HMRC's own Self Assessment legal framework manual (SALF308A) says the first 5% penalty arises where a balancing payment or payment on account is still unpaid more than 30 days from the due date for that year's balancing payment. Further 5% penalties follow at five and 11 months after that penalty date.

HMRC's guide to Self Assessment penalties also sets out separate late filing penalties, starting at £100 for a late return. Those apply to the return, not to the 31 July payment. Missing a payment is therefore not a reason to delay filing; it is a reason to file early so you know the real figure.

Is a late payment on account charged a penalty?

Not on its own at first. A late 31 July payment is charged interest from 1 August. It only becomes exposed to a 5% penalty if it is still unpaid more than 30 days after the following 31 January, when it is treated alongside that year's balancing payment. Clearing it before then avoids the penalty.

Some consumer articles say a 5% penalty applies 30 days after 31 July. That is not how HMRC's manual describes the rule. The practical point is the same, though: the longer a payment on account sits unpaid, the more interest you pay, and the closer you get to a penalty date you could have avoided.

What HMRC letters and statements follow a missed payment?

Usually a Self Assessment statement showing the overdue charge, followed by reminders if it stays unpaid. Statements also appear in your online account and the HMRC app. If you do not respond or pay, HMRC can take further steps to collect the debt, so reply to the first letter, not the last.

Drivers often panic when the statement shows a total that is larger than they expected. Common reasons include interest added since 1 August, an old balance from a previous year, a payment put against the wrong year, or a first payment on account that was never cleared. Our HMRC support checklist for drivers lists the documents to gather before you call.

• Statement or reminder: confirms what HMRC thinks is due. Check it against your bank records.
• Interest charge: appears as a separate line. It is not a penalty and cannot be appealed, but paying sooner stops it growing.
• Penalty notice: arrives if tax is still unpaid after the penalty date. HMRC asks for payment within 30 days of the notice, and you can appeal if you have a reasonable excuse.
• Phone call or letter from debt management: means the debt has moved to collection. Respond quickly and propose a plan.

Illustrative example: a driver who reduced too far and then paid late

This is an illustrative example using an invented driver, Dev, a private hire driver in the Midlands. The figures are rounded, and the interest uses 7.75% a year purely for illustration; the real rate depends on the base rate on each day.

• Dev's 2025/26 Self Assessment bill, Income Tax plus Class 4 NIC, is £4,200. HMRC sets 2026/27 payments on account of £2,100 on 31 January 2027 and £2,100 on 31 July 2027.
• In spring 2027 his car is off the road for ten weeks. He estimates his 2026/27 bill at £3,000 and reduces each payment on account to £1,500. He pays the January instalment on time.
• He misses 31 July 2027 and pays the £1,500 on 15 September 2027, 46 days late. Interest: £1,500 x 7.75% x 46/365 = about £14.65.
• He files his 2026/27 return in January 2028. His actual bill is £3,400, so each payment on account should have been £1,700, not £1,500.
• Interest on the £200 January shortfall for one year: £200 x 7.75% = £15.50. Interest on the £200 July shortfall for 184 days: about £7.81.
• Balancing payment due on 31 January 2028: £3,400 - £3,000 = £400, plus his first 2027/28 payment on account.
• Because the July payment was cleared well before 30 days after 31 January 2028, no 5% late payment penalty arises. Total interest is about £38.

The lesson is not that reducing was wrong. Dev's reduction was sensible, but a slightly more careful estimate and a Budget Payment Plan would have avoided most of the cost. The bigger risk is the driver who leaves a payment unpaid past the penalty date, when 5% of the debt is added in one go.

Can I appeal late payment interest or a penalty?

You cannot appeal interest, because it is not a penalty; it simply reflects the time the tax was late. You can appeal a late payment penalty if you had a reasonable excuse, such as serious illness or a bereavement shortly before the deadline. Pay or arrange to pay as soon as the excuse ends.

HMRC's list of what counts as a reasonable excuse includes an unexpected hospital stay, a serious illness, a close relative's death shortly before the deadline, and problems with HMRC's online services. It is equally clear about what will not be accepted: a payment that failed because you did not have enough money, finding the online system difficult, or not getting a reminder.

When should I get professional representation with HMRC?

Get help when the debt is large, when several years are unpaid or unfiled, when HMRC's figures do not match your records, or when a penalty has already been charged. An accountant authorised as your agent can speak to HMRC, correct the statement and negotiate a plan that you can afford.

• You owe more than £30,000, or you have other tax debts, so the online plan is closed to you.
• You have unfiled returns, which must be brought up to date before most plans can be agreed.
• HMRC has issued penalties and you think you may have a reasonable excuse.
• Your statement shows payments on the wrong year or charges you do not recognise.
• You have received a letter from HMRC debt management or a field visit has been mentioned.
• Stress about the debt is stopping you opening post. That is common, and it is exactly when a representative helps most.

Common mistakes with the Self Assessment July 31 deadline and the penalty each triggers

• Ignoring the 31 July payment because no penalty arrives on 1 August. Result: daily interest, then a 5% penalty if still unpaid more than 30 days after the next 31 January.
• Reducing payments on account to nil without real figures. Result: interest on the difference from the original due dates when the return is filed.
• Delaying the tax return because you cannot pay. Result: a £100 late filing penalty from 1 February, with daily penalties after three months, on top of any payment problems.
• Using the wrong payment reference. Result: the payment can be delayed or allocated elsewhere, so the 31 July charge looks unpaid and interest accrues.
• Paying by a slow method on the last day. Result: a new Direct Debit can take five working days, so a last-minute set-up arrives late and attracts interest.
• Missing payment plan instalments. Result: HMRC can cancel the plan and ask for the full amount, and penalties can follow on what is still unpaid.
• Claiming lack of money as a reasonable excuse. Result: the appeal is likely to fail and the penalty stands.

Key terms

• Payment on account (POA): an advance payment towards the current year's tax, normally half of last year's bill, due 31 January and 31 July.
• Balancing payment: the amount still owed after payments on account, due on 31 January after the tax year ends.
• SA303: HMRC's form to reduce payments on account by post. The same claim can be made online.
• Time to Pay arrangement: an HMRC payment plan for an overdue tax bill, paid by Direct Debit with interest.
• Budget Payment Plan: voluntary weekly or monthly Direct Debits towards your next Self Assessment bill.
• Late payment interest: a charge at base rate plus 4% that compensates for late payment. It is not a penalty.
• UTR: your 10-digit Unique Taxpayer Reference. Add the letter K to make your payment reference.
• Reasonable excuse: an event outside your control, such as serious illness, that may allow a penalty to be cancelled.

How UK Driver Accountants helps

We work only with drivers, on fixed fees from £20 a month, and we are independent of every ride-hailing platform. Through our HMRC support service we can act as your agent, check your Self Assessment statement, reduce payments on account with properly worked figures, and agree a realistic payment plan with HMRC. See our fixed-fee pricing for what each plan includes.

If your income is heading above £50,000, remember that Making Tax Digital (MTD) for Income Tax brings quarterly updates and its own penalty rules. Our comparison of Self Assessment and Making Tax Digital explains what changes for drivers.

Next steps before your next 31 July payment

If you missed the Self Assessment July 31 deadline in 2026, check your statement this week and pay or set up a plan well before early March 2027. If 31 July 2027 is your worry, file your 2026/27 return early, decide whether a reduction is justified, and start a Budget Payment Plan now. If you would like us to look at your HMRC account for you, contact our team and we will tell you what we see.

Last reviewed 28 October 2026 by the UK Driver Accountants tax team

This article is general information and not personal tax advice. Rates, conditions and HMRC procedures can change, so check GOV.UK and speak to a qualified accountant about your own circumstances. Where HMRC disputes, penalties or debt collection are involved, we recommend professional representation.