HMRC Login: What Cardiff Drivers Can Do in Their HMRC Account

Your HMRC login opens a set of online accounts, and most self-employed drivers use only a fraction of them. Once you are inside your accounts you can file and check your Self Assessment, see your tax bill, pay it, check your National Insurance record and State Pension forecast, and, if you need to, sign up for Making Tax Digital. This guide is a checklist of what to do inside your accounts, not a sign-in walkthrough.

If you first need help with the sign-in itself, read our HMRC login guide for drivers, which covers Government Gateway, GOV.UK One Login and finding your UTR. Here we assume you can already get in. We also cover scam messages, and what Cardiff and Welsh drivers should know locally.

Key takeaways

• An HMRC login gives you a personal tax account, the HMRC app, and (if you are VAT registered) a separate VAT online account.
• Inside your accounts you can view your tax bill, pay it online, check your tax code, and see your National Insurance record and State Pension forecast.
• You can authorise an accountant online, but never share your HMRC login with anyone.
• HMRC will not ask for your password or bank details by text or call. Check anything suspicious on GOV.UK.
• Welsh drivers pay Welsh rates of Income Tax, and Cardiff has no charging Clean Air Zone at the time of the council's plan.

What is an HMRC online account?

An HMRC online account is the secure area you reach with your HMRC login. It holds your personal tax account, your Self Assessment record and, for some drivers, business services such as VAT. It lets you see and manage your tax affairs without phoning HMRC.

What can I do once I have an HMRC login?

You can manage most of your tax affairs online. According to HMRC's personal tax account guidance, you can check your Income Tax estimate and tax code, submit or manage a Self Assessment return, claim a refund, find your National Insurance number and UTR, and tell HMRC about a change of name or address.

That list is long, so the sections below turn it into a driver's checklist. Each item says why it matters for someone driving for Uber, Bolt or a local operator.

How do I view and update my Self Assessment online?

After your HMRC login, choose the Self Assessment option in your account. From there you can start, continue, submit or amend a return. You can also see what HMRC holds for you. GOV.UK confirms you can submit, view or manage a Self Assessment tax return online.

Most Cardiff drivers file once a year for the 2026/27 tax year. Check your income and expenses against your records before you press submit. Our guide to key tax dates for Uber drivers lists the filing and payment deadlines.

Amending is worth knowing about. If you spot a mistake after filing, the online account is where you correct it. Do this promptly rather than waiting for a letter.

How do I check my tax bill online?

Use your HMRC login to open your Self Assessment section and see how much tax you owe. Your personal tax account and the HMRC app also show what you owe and let you set payment reminders. The figure updates after you file, so check it before each deadline rather than guessing.

Drivers often forget that the bill has more than one part. It can include Income Tax, Class 4 National Insurance contributions (NIC, a tax on self-employed profits) and a payment on account. Read the breakdown line by line.

How do payments on account show in my HMRC account?

Payments on account are advance payments towards next year's bill, and they appear as separate lines in your Self Assessment record. HMRC's payment guidance says the 31 January payment covers your balancing payment plus the first payment on account. The second payment on account falls due on 31 July.

This catches many new drivers out. In your first full year you may owe your bill plus a first advance payment in one go on 31 January. Set money aside every week. Our tax calculator helps you estimate a sensible weekly amount.

How do I pay my Self Assessment bill online?

You can pay online through your account, the HMRC app or your bank. According to GOV.UK's guidance on paying a Self Assessment bill, online bank payments and Faster Payments can arrive the same or next day. Bacs and existing Direct Debits take about three working days, and a new Direct Debit takes about five.

Late payment brings interest and may bring a penalty. GOV.UK also notes that if you struggle to pay, you can ask about payment support before the deadline. Do not wait until after 31 January to make contact.

How do I check my National Insurance record and State Pension forecast?

Use your HMRC login for the GOV.UK services covering your National Insurance record and State Pension forecast. The State Pension forecast service shows your projected amount, your State Pension age and ways to increase it. You cannot use it if you already receive State Pension.

The National Insurance record service shows what you have paid up to the start of the current tax year, any gaps, and whether voluntary contributions could fill them. Self-employed drivers should check this every few years, because gaps can reduce a future pension.

Where can I see or correct my tax code?

After your HMRC login, you can check your tax code online, or in the HMRC app. GOV.UK says you can also see previous years' codes and ask for emails when your code changes. Tax codes mainly apply to wages and pensions, so a driver who is only self-employed may not see one.

Many drivers have a part-time job as well. If that describes you, check the code on your payslip against your account. A wrong code can cause an overpayment or a surprise bill.

Can I update my personal details in my HMRC account?

Yes. You can tell HMRC about a change of name or address through your personal tax account, and the HMRC app also lets you update your name or address. Keep your address current. HMRC sends important letters, and a missed letter can mean a missed deadline.

How do I use the HMRC app for Self Assessment?

Download the HMRC app on iOS or Android, sign in with your HMRC login, then use a 6-digit PIN, fingerprint or face recognition next time. The app shows your tax code, National Insurance number and Self Assessment details, and lets you make payments and set reminders.

GOV.UK's HMRC app page also says you can check your State Pension summary and claim a tax refund. The app suits quick checks between fares. Do the full return on a computer, where it is easier to review.

How do I authorise an accountant to deal with HMRC for me?

You authorise an agent through an official online route or by using paper form 64-8, never by handing over your password. GOV.UK says you must register for Self Assessment first. Your agent can then file returns, discuss them with HMRC and view your income sources.

HMRC's agent authorisation guidance is clear that you stay legally responsible. If your agent files for you, you must check the figures and confirm they are correct first. Our HMRC support service handles this for drivers.

How do I sign up for Making Tax Digital from my account?

Making Tax Digital (MTD) for Income Tax is HMRC's system of digital records and quarterly updates for sole traders. GOV.UK says qualifying income over £50,000 must use it from 6 April 2026. You sign up online with your Self Assessment HMRC login, or an agent can do it for you.

According to GOV.UK, from September 2026 HMRC will start to sign up anyone who needs MTD for 2026/27 and has not signed up themselves. It also says HMRC will not apply penalty points for late quarterly updates in 2026/27. The threshold then drops to £30,000 in 2027 and £20,000 in 2028. Read our guides to MTD for Uber drivers and Self Assessment versus MTD, then see our Making Tax Digital service.

Do I need a separate VAT online account?

Yes, if you are VAT registered. VAT is a separate service, so it has its own online account, even though you may reach it through the same HMRC login. GOV.UK's VAT returns page says the account shows when returns are due and whether HMRC received them.

Most drivers are not VAT registered, because the registration threshold is £90,000 of taxable turnover. If you are near it, read our guide to VAT for Uber drivers. We could not load GOV.UK's dedicated VAT sign-in page this run, so check that page for the latest sign-in steps.

Which tasks can I do with my HMRC login, and where?

The table below matches each common task to the place you do it once you have used your HMRC login. It comes from the GOV.UK pages linked in this guide. Where we could not confirm a feature on GOV.UK this run, the notes column says so.

How do I check my HMRC account in six steps?

Follow these six steps every quarter to keep your HMRC login and account in good order. It takes about ten minutes, and it stops most nasty surprises. Use your own device, not a shared one, and keep your phone updated.

1. Use your HMRC login only through the official GOV.UK link, never a link from a text or email.
2. Open Self Assessment and check the amount you owe and the due date.
3. Look at any payments on account and confirm you have set money aside.
4. Check your personal details, especially your address and email.
5. Open the National Insurance and State Pension pages once a year.
6. Sign out of your HMRC login, and note any messages HMRC has left in your account.

What is the difference between a personal tax account and the HMRC app?

The personal tax account is the full website service, and the app is a shorter mobile version. Both use the same HMRC login. The website is better for filing and long reviews. The app is better for quick checks, reminders and payments.

How do I spot fake HMRC texts, emails and calls?

Treat any unexpected message about a refund, penalty or arrest as a possible scam. HMRC guidance on GOV.UK says do not give out private information, reply to texts, download attachments or click links if you are not sure they are genuine. Go to GOV.UK and use your HMRC login yourself instead.

Report scam texts free by forwarding them to 7726, and forward scam emails to report@phishing.gov.uk. Read GOV.UK's advice on reporting phishing for more. If you have lost money in England or Wales, GOV.UK says to contact Report Fraud on 0300 123 2040.

Warning signs on your phone

• A text with a link that promises a tax rebate or threatens a fine.
• A caller who says you must pay immediately by gift card or transfer.
• A website that looks like GOV.UK but asks you to pay to use a free service.
• An email asking you to confirm your password or bank details.

Drivers are a target because they use their phones all day. Never enter your HMRC login details on a page you reached from a message. Type the address or use the app.

What do Cardiff drivers need to know about licensing and tax?

Cardiff Council licenses hackney carriage and private hire drivers, and your licence and your HMRC record sit in separate systems. The council does not file your tax return. However, private hire and taxi licensing in England and Wales includes a tax check, so keep your Self Assessment up to date. Confirm current rules on cardiff.gov.uk.

Licensing fees and exact requirements change each year, so we do not list them here. Commonly, a private hire applicant needs a full UK licence, the right to work in the UK, an enhanced DBS check and a medical. Confirm each item with the council before you apply.

Hackney carriage (black cab) drivers should note one tax point. HMRC's 55p and 25p simplified mileage rates for 2026/27 exclude hackney carriages, so keep actual vehicle costs. Read our Cardiff drivers page for local support.

Do Welsh drivers pay different Income Tax?

Yes. If your main home is in Wales, you pay the Welsh rates of Income Tax, set by the Welsh Government. According to GOV.UK's Welsh Income Tax page, HMRC marks Welsh taxpayers with a C prefix on the tax code. Welsh residents pay the same rates on dividends and savings as other UK residents.

For 2026/27 GOV.UK lists the Welsh bands as 0% up to £12,570, 20% to £50,270, 40% to £125,140 and 45% above that. These match the main English bands at the time of writing, but rates can change, so check GOV.UK. Your HMRC login account uses the right rates when it works out your bill, provided HMRC has your correct address.

Does Cardiff have a Clean Air Zone charge?

No. Cardiff Council's Clean Air Plan, published on its newsroom, said the city would not bring in a charging Clean Air Zone. Instead the council chose a package of other measures, including taxi incentives for hybrid and electric vehicles. Check cardiff.gov.uk for the current position before you buy or change a vehicle.

This matters for your tax records. If a charge ever applies, keep the receipt and check the treatment on GOV.UK before claiming. Our guide to allowable expenses explains how to record vehicle costs.

Illustrative example: a Cardiff driver uses the account

This illustrative example uses an invented driver, and the figures are simplified. It ignores Class 2 NIC, other income and any reliefs. Rates are the 2026/27 Welsh income tax bands from GOV.UK and Class 4 NIC at 6%.

• The driver's taxable profit for 2026/27 is £30,000.
• After the £12,570 personal allowance, taxable income is £17,430.
• Income Tax at 20% is £3,486.
• Class 4 NIC at 6% on £17,430 is £1,045.80.
• The estimated bill is £4,531.80.
• In the account, the driver sees this figure, checks it, and pays by Faster Payments before 31 January 2027.

A payment on account is usually half of the bill, which here would be about £2,265.90, but check HMRC's guidance on how it is worked out. The driver then sets aside about £87 a week for the following year. That is a planning figure, not a promise of what HMRC will charge.

What are the most common mistakes, and what penalty follows?

The most common mistakes are missing deadlines, ignoring letters and trusting scam messages. Late returns and late payments can lead to penalties and interest. GOV.UK says interest applies and a penalty may apply if you pay late. Check GOV.UK for current penalty amounts.

• Using your HMRC login from a link in a text. The risk is a stolen account and a fraud loss.
• Sharing your password with a helper. This breaches HMRC's rules and you remain responsible for what is filed.
• Not checking the address and email on your HMRC login. You may miss a letter and then miss a deadline, which can trigger penalties.
• Ignoring payments on account. A bigger 31 January bill can lead to late payment interest.
• Forgetting MTD. If you fall inside the threshold, you may need to keep digital records and send quarterly updates.
• Assuming the app does everything. Some jobs, such as filing, are best done on the website.

How Uber Driver Accountant helps

We are an accountancy practice for drivers only, and we are independent of Uber and Bolt. Our fixed fees start from £20 a month, and see our pricing for details. We can be your authorised agent, check your account with you, and file your return. Our personal tax service covers Self Assessment for Cardiff drivers.

We do not need your HMRC login password. You authorise us through the official route, and you see what we file before it goes to HMRC.

Key terms

• UTR: Unique Taxpayer Reference, the 10-digit number HMRC gives you for Self Assessment.
• NIC: National Insurance contributions, which fund your State Pension and some benefits.
• MTD: Making Tax Digital, HMRC's digital records and quarterly update system.
• PHV: private hire vehicle, such as an Uber car.
• POA: payment on account, an advance payment towards next year's tax bill.
• Government Gateway and GOV.UK One Login: the two kinds of HMRC sign-in.

Conclusion

Your HMRC login is worth more than a once-a-year return. Use it to see your bill, plan payments, check your pension record, keep your details current and stay safe from scams. If you want us to check your account with you, contact us today and we will help you get organised.

Last reviewed 21 September 2026 by the Uber Driver Accountant tax team.

This guide is general information and is not personal tax advice. Speak to a qualified accountant about your own circumstances, and take professional representation if HMRC disputes a figure or charges a penalty.