Private Hire Driver Accountant in Cardiff: Step-by-Step How-To for Local Drivers
A private hire driver accountant in Cardiff files your Self Assessment return, keeps your records in order and deals with HMRC for you, and you can hire one in ten steps. This guide gives the order to do them in, tied to your licence renewal, the HMRC tax check and the 31 January 2027 deadline.
Published 1 November 2026 · Updated 1 November 2026
A private hire driver accountant in Cardiff files your Self Assessment return, keeps your records in order and speaks to HMRC for you. You can hire one in ten steps, and the order matters because your licence renewal, the HMRC tax check and the 31 January 2027 filing deadline all pull on the same few weeks.
Most guides tell you what an accountant does. This one is a working timetable for Cardiff drivers, written as a sequence you can follow from today, 1 November 2026. It does not repeat our other Cardiff pages: for what to do inside your account, read our HMRC online account guide for Cardiff drivers, and for the return itself, see our Cardiff 2026 tax return update.
Key takeaways
- Start now: from 1 November 2026 you have 91 days to the 31 January 2027 online Self Assessment deadline for the 2025/26 tax year.
- Your licence tax check on GOV.UK must be done by you, not your accountant, and the 9-character code lasts 120 days.
- Authorise your accountant with HMRC online where you can; you stay legally responsible for what is filed.
- Compare quotes on scope, not just price: who files, who answers HMRC letters, and what records they need.
- Welsh drivers pay Welsh rates of Income Tax, so make sure HMRC holds your correct Cardiff address.
What is a private hire driver accountant?
A private hire driver accountant is an adviser who works mainly with self-employed taxi and private hire drivers. They prepare your Self Assessment return, claim the expenses you are entitled to, and act as your authorised agent with HMRC. Good ones also plan your tax payments through the year.
Why does the order of the steps matter for Cardiff drivers?
Three dates compete in the winter. Your online Self Assessment return is due by 31 January 2027, your payment is due the same day, and your Cardiff Council licence may fall due for renewal at any point. If you hire an accountant in January, they have days rather than weeks to chase missing figures.
According to GOV.UK's guidance on Self Assessment deadlines, the online deadline is 31 January after the tax year ends. Our guide to key tax dates for ride-hailing drivers lists the full calendar, so we will not repeat it here.
How do you hire a private hire driver accountant in Cardiff? Ten steps
Work through these ten steps in order, because each one feeds the next. Each step is short, and most take under an hour. The sequence is our own, but every rule it relies on comes from the official GOV.UK pages linked later in this guide.
- Write down what you need help with: a yearly return only, monthly bookkeeping, VAT advice, or help with HMRC letters. Be honest about how tidy your records are.
- Put three dates in your diary: your licence expiry, 31 January 2027 for filing and paying, and the date you want your first meeting. Count back from the licence expiry so the tax check is never rushed.
- Shortlist two or three firms that work with drivers. Ask whether they hold a professional body membership and where you can check it on that body's public register.
- Ask each firm the same eight questions (see the table below) and get the answers in writing. A fixed fee in writing is better than a verbal estimate.
- Sign an engagement letter. It should name the services, the fee, who files your return and what happens if HMRC opens an enquiry.
- Authorise the firm with HMRC. Online authorisation is preferred where available; form 64-8 is the paper fallback. You must have registered for Self Assessment first.
- Send your records pack: income statements from your driver apps, bank statements, mileage figures, licence and insurance costs, and your Unique Taxpayer Reference (UTR).
- Check HMRC holds your correct name, address and Welsh taxpayer status, then complete your licence tax check yourself when your renewal approaches.
- Review the draft return line by line before it is filed. HMRC says you must check the information is correct before your agent sends it.
- Agree a payment plan: set aside a share of each week's takings, and diarise 31 January and 31 July payments on account if they apply.
What should you ask a private hire driver accountant before you hire them?
Ask about scope, price and who does what, then compare the answers in writing. The aim is to find out exactly what you get for the fee, because two quotes that look equal often cover very different amounts of work. The table turns that into a checklist.
| Question | Answer you want | Red flag |
|---|---|---|
| Is the fee fixed, and what does it cover? | A fixed fee, with the services listed | Quote given as a vague 'from' price |
| Who files my return? | The firm, as your authorised agent, after you approve it | You are asked to file and they only advise |
| Do you work with private hire drivers? | Yes, with examples of the expenses drivers claim | They cannot explain mileage rates versus actual costs |
| Who answers HMRC letters? | The firm, within an agreed time | Letters are extra charges with no cap |
| What records do you need? | A clear list and a deadline | 'Send what you have in January' |
| Do you handle Making Tax Digital? | Yes, or they explain when it applies to you | They have not heard of it |
| How do you hold my documents? | Secure upload, not email attachments | Documents sent by text message |
| How do I leave if I am unhappy? | Notice period stated in the letter | Long lock-in or no handover offered |
How much does a private hire driver accountant cost?
Fees vary by firm and by scope, so we will not quote a market average we cannot source. Ask for a fixed fee in writing and compare what is included. Our own fixed fees start from £20 a month, and you can see the details on our pricing page.
If you only need a return filed once a year, a one-off fee may suit you. If your records are messy or you may need VAT or Making Tax Digital soon, monthly support often works out better than fixing a year of problems in January. Either way, ask what happens to the fee if HMRC writes to you.
Can your accountant do the licence tax check for you?
No. According to HMRC's guidance to complete a tax check, you must complete it yourself and a tax agent or adviser cannot do it for you. You then give the licensing authority the 9-character code, which expires after 120 days.
First-time applicants do not complete the full check. GOV.UK's guidance on confirming your tax responsibilities says you confirm you have read HMRC's guidance on being registered for tax. Your accountant can make sure your Self Assessment registration is correct beforehand, which is where a check usually goes wrong.
The check asks how you pay tax on your licensed income, and it cannot be completed if your details do not match HMRC's records. Check your details a few weeks before renewal rather than on the day. If the service will not run, GOV.UK says to contact your licensing authority and HMRC for help.
What does being a Welsh taxpayer mean for a Cardiff driver?
If your main home is in Wales, you pay Welsh rates of Income Tax. For 2026/27 GOV.UK lists a 20% basic rate on income from £12,571 to £50,270, the same headline band as elsewhere in the UK, but the Welsh Government sets the rates, so check GOV.UK each year.
GOV.UK's Welsh Income Tax guidance explains that your main home decides your status, and that you should update your address with HMRC if it holds the wrong one. For Self Assessment, the guidance mentions a box on the online return to confirm you pay Welsh rates, so check the current return with your accountant. This is the one Welsh point worth putting on their checklist.
Cardiff Council is your licensing authority. We have not verified its current fees or conditions for this guide, so check cardiff.gov.uk for those. Our Cardiff drivers page covers local support.
How should you hand your records to an accountant?
Give your accountant a single pack covering the whole tax year, arranged by income and by cost. Do it in one upload, with a note on anything unusual. A complete pack saves them chasing you and saves you paying for the chasing.
- Income: each driver app's annual earnings statement, plus any direct bookings you recorded.
- Bank statements for the account you use for driving.
- Mileage: a log with date, journey and miles. Our guide to mileage logs and bookkeeping shows what to record.
- Fixed costs: licence and badge, vehicle and insurance paperwork, phone contract.
- Your UTR, National Insurance number and last year's return, if you have one.
If you are not sure which costs you can claim, see our guide to allowable expenses for ride-hailing drivers. For a quick estimate of your business miles, try our mileage calculator.
Should you claim mileage or actual vehicle costs?
Most car drivers use simplified mileage. According to GOV.UK's guidance on simplified expenses for vehicles, the 2026/27 rate is 55p a mile for the first 10,000 business miles and 25p after that, applying from 6 April 2026. Check the GOV.UK page for who can use it, because some vehicles and hackney carriages are treated differently.
Your accountant should show you both calculations before you choose. Once you pick one method for a vehicle, the choice can be hard to reverse, so ask them to explain the switching rules in writing.
Illustrative example: one Cardiff driver, one winter
Illustrative example: a Cardiff private hire driver, whom we will call Driver A, is invented and the figures are made up. Driver A took £38,000 of fares in 2026/27 and drove 14,000 business miles. The other costs shown are only those not covered by the mileage rate.
| Item | Amount | Note |
|---|---|---|
| Fares received (turnover) | £38,000 | From app statements and bank records |
| Mileage: first 10,000 miles at 55p | £5,500 | Simplified expenses |
| Mileage: next 4,000 miles at 25p | £1,000 | Simplified expenses |
| Phone contract (business share) | £360 | Actual cost |
| Licence and badge | £300 | Actual cost |
| Parking | £140 | Actual cost |
| Profit before tax | £30,700 | £38,000 minus £7,300 of costs |
Driver A hires an accountant on 1 November 2026, giving 91 days before the 31 January 2027 deadline. They authorise the firm in the first week, upload records by mid-December, and approve the draft in early January. Their licence renews in February, so they complete the tax check themselves a few weeks before, which leaves the 120-day code plenty of room.
Because Driver A's turnover is £38,000, they sit below the £50,000 income level at which Making Tax Digital for Income Tax began on 6 April 2026, and well under the £90,000 VAT registration threshold. Check the GOV.UK pages on Making Tax Digital for Income Tax and the VAT registration rules on GOV.UK, because the rules use your own figures and can change.
What are the most common mistakes, and what penalty does each trigger?
Most problems come from leaving things late or assuming someone else has done them. The table below lists the mistakes we see most often with Cardiff drivers, and the HMRC or licensing consequence each one can trigger. Fixing them costs little if you act early.
| Mistake | What can happen |
|---|---|
| Hiring in January and filing late | A £100 late-filing penalty, then £10 a day after 3 months up to £900, per GOV.UK |
| Paying late | 5% of unpaid tax at 30 days, 6 months and 12 months, plus interest |
| Assuming the accountant did the licence check | The licensing authority cannot process your renewal without your code |
| Sending an incomplete records pack | Estimated figures, delay and extra fees |
| Not checking the return before filing | You are legally responsible for what is sent to HMRC |
| Wrong address on HMRC's records | Welsh rates or the tax check may not match |
The late filing and payment figures come from GOV.UK's page on Self Assessment penalties. If HMRC does charge a penalty or opens an enquiry, we recommend professional representation rather than dealing with it alone.
What if you want to change accountant?
You can change accountant at any time. Tell your old firm in writing, ask for a handover of your records, and authorise the new firm with HMRC. Then remove the old firm's authority using HMRC's guidance so they no longer have access. GOV.UK's page on authorising an agent explains the online and paper routes.
Key terms
- UTR: Unique Taxpayer Reference, the 10-digit number HMRC gives you for Self Assessment.
- Authorised agent: an accountant or adviser HMRC lets act for you, such as filing your return.
- Form 64-8: HMRC's paper form for authorising an agent, used when you cannot do it online.
- Tax check code: the 9-character code you give your licensing authority at renewal.
- MTD: Making Tax Digital, HMRC's system of digital records and quarterly updates.
- Payments on account: advance payments towards your next tax bill.
How UK Driver Accountants helps
We are an accountancy practice for drivers only, and we are independent of any ride-hailing app. Our fixed fees start from £20 a month, and our personal tax service covers Self Assessment for Cardiff drivers. Our HMRC support service handles letters and enquiries.
We can act as your authorised agent, check your records pack against your bank statements and show you both mileage calculations before you decide. We cannot do your licence tax check for you, because HMRC says you must complete it yourself, but we will tell you when to do it.
Conclusion: start with step one this week
Hiring a private hire driver accountant in Cardiff is a ten-step job that takes a few hours spread over a few weeks. Done in November, it leaves you a calm January. Done in January, it is a scramble.
Ready to start? Contact us and we will walk you through the first three steps, or read our Cardiff payment guide to plan how you will pay.
Last reviewed 1 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, and take professional representation if HMRC raises a dispute or penalty.
Questions drivers ask about this
Would you rather not think about any of this?
That is exactly what we are for. Send us your driver app statements and we will handle the return, the quarterly updates and the deadlines — and tell you honestly if there is a better way for you to be set up.
