How Do I Check How Much I Owe HMRC Online?

A tax bill is far easier to deal with when you know the figure early. If you are asking, “How do I check how much I owe HMRC?”, the answer depends on the tax involved and how you earn your income. A self-employed electrician, a CIS subcontractor, a landlord and a limited company director may all need to check in different places.

The key is not simply finding a number on screen. You need to know what period it covers, whether payments already made have been allocated, and when the balance must be paid. That is how you avoid paying the wrong amount, missing a deadline or assuming an unexpected bill is correct when it needs checking.

How do I check how much I owe HMRC?

For most people, the quickest starting point is their HMRC online account or the HMRC app. Sign in using your Government Gateway details and look for the relevant tax service, such as Self Assessment, PAYE, VAT or Corporation Tax.

If you do not have sign-in details, you can create them, although identity checks may mean it is not immediate. Keep your Government Gateway user ID safely stored once you have access. It is usually needed whenever you check balances, submit returns or make changes.

The route you use matters because HMRC does not show every tax liability in one simple personal balance. A Self Assessment bill may sit separately from PAYE tax, VAT or Corporation Tax. If you run a business, make sure you are looking at the correct account for the correct tax.

If you submit a Self Assessment tax return

Sole traders, landlords, CIS workers and company directors who file Self Assessment can usually see their position in the Self Assessment section of their online account. After submitting a return, look for your statement or amount due.

This normally shows the tax calculated for the year, payments on account, any payments already received and the remaining balance. It may also show a repayment if you have overpaid.

Be careful with the wording. A figure labelled as due soon may not be your total liability for the year. It could include the first or second payment on account for the following tax year. This catches out many self-employed people, particularly when profits have risen from one year to the next.

For example, after filing a return, you may need to pay the balancing payment for the previous tax year by 31 January, plus the first payment on account towards the next year on the same date. A second payment on account is generally due by 31 July. Your online statement should make this split clear.

If you are employed or have a pension

If tax is collected through PAYE, your Personal Tax Account or the HMRC app can show your tax code, estimated income, tax paid and National Insurance information. This is useful if your tax code has changed, you have more than one job, or you think too much or too little tax is being deducted.

PAYE does not always produce a bill that you need to pay immediately. HMRC may change your tax code to collect an underpayment through your wages or pension. In other cases, it may send a calculation or ask you to pay directly. Read any HMRC notice alongside what you see online, rather than relying on one figure in isolation.

If you are VAT registered

VAT liabilities are checked through your VAT online account or compatible Making Tax Digital software. Once a VAT return has been submitted, you can see the amount due, the payment deadline and previous payments.

Do not assume a return has been paid just because it was filed. Submission and payment are separate actions. This is particularly relevant for busy trades and small businesses that submit the return through bookkeeping software, then intend to make the payment later.

If you run a limited company

Corporation Tax is separate from your own personal tax. Your company’s Corporation Tax position is generally checked through its HMRC business tax account, company tax return records and HMRC correspondence.

The corporation tax calculation is based on the company’s accounting period, not the standard 5 April tax year. The payment deadline is often before the Company Tax Return filing deadline, so waiting until the return is due can create unnecessary pressure. Your accounts and tax computation should support the figure you see in the company’s records.

If you operate payroll, PAYE and National Insurance due as an employer must also be checked separately through HMRC’s PAYE for employers service. A company can therefore have several different HMRC obligations at once, each with its own deadline and payment reference.

Check the statement before you pay

Finding a balance is the first job. Checking it makes sense is the next one. Before making a payment, compare the HMRC statement with your own records: submitted returns, payment confirmations, bookkeeping records and any tax calculation prepared for you.

A balance may look higher than expected because a recent payment has not yet appeared, because payments on account have been added, or because HMRC has estimated a liability where a return is overdue. On the other hand, it may be too low if a return has not been submitted or a correction has not yet been processed.

CIS subcontractors should take particular care. Tax deducted by contractors should be included correctly on a Self Assessment return. If deductions have been missed or reported incorrectly, the bill can be overstated and a refund may be due instead. Keep your monthly deduction statements and reconcile them before accepting the final position.

Landlords should also check whether the return includes all rental income and allowable costs. Mortgage interest relief, repairs, replacement items and jointly owned property can all affect the calculation. The right figure is not always obvious from bank transactions alone.

What if HMRC says you owe more than expected?

Do not ignore it. Interest and penalties can build up, and an unpaid balance rarely becomes easier to resolve with time. Start by checking whether the amount relates to a submitted return, an estimated assessment, a payment on account or an earlier tax year.

If the figure is correct but you cannot pay in full, contact HMRC as soon as possible to discuss your options. In some circumstances, a Time to Pay arrangement may be available. It is not automatic, and you should only agree to an instalment amount you can realistically maintain.

If your income has fallen and payments on account no longer reflect your expected tax bill, you may be able to reduce them. This needs care. Reducing them too far can lead to interest if the final tax liability turns out to be higher than predicted. A genuine, evidence-based estimate is far better than a hopeful one.

Where the amount appears wrong, establish why before paying or challenging it. It may be as simple as a payment being allocated under the wrong reference, but it can also point to a missing return, an incorrect tax code or an error in the figures filed.

Use the right payment reference

A payment can be delayed or allocated incorrectly if it is sent with the wrong reference. For Self Assessment, use your Unique Taxpayer Reference followed by the relevant payment suffix shown on your HMRC statement. For VAT, PAYE and Corporation Tax, use the specific reference issued for that tax.

Keep proof of payment, including the date, amount and reference used. Online account balances do not always update instantly, so do not make a second payment simply because the first one has not appeared straight away. Allow processing time, then check again.

When an accountant can save time

Checking an HMRC balance is straightforward when records are clean and the tax position is simple. It becomes less straightforward when you have CIS deductions, rental income, payroll, VAT, a limited company or several years of returns to untangle.

A good accountant can reconcile what HMRC says is due against your underlying records, identify whether a payment on account should be reduced, and make sure any refund claim is properly supported. At Short And Sons Accountants, that practical approach is especially useful for self-employed workers and trade clients who need a clear answer without losing hours to tax administration.

The best time to check what you owe is before the deadline is close. Make it a regular part of your bookkeeping routine, keep your HMRC account details secure, and deal with anything that does not add up while the records are still easy to trace.