HMRC missed out on £46.8bn in tax last year. Small businesses and Corporation Tax make up the biggest share of the shortfall.

The tax gap for the 2023-24 tax year has been published and is estimated to be 5.3% of total theoretical tax liabilities.

The tax gap is basically the difference between the amount of tax that should have been paid to HMRC and the amount of tax collected by the Exchequer. The gap includes tax that has been avoided in the UK’s black economy, by criminal activities, through tax avoidance and evasion. However, it also includes simple errors made by taxpayers in calculating the tax they owe as well as outstanding tax due from businesses that have become insolvent. 

In monetary terms, the tax gap is equivalent to lost tax of £46.8 billion. This means that HMRC collected £829.2 billion or 94.7% of all tax due.

The government has announced plans to raise a further £7.5 billion through its measures to close the tax gap.

Some of the key findings from this year’s calculations show:

• Small businesses represent the largest proportion of the tax gap (60%).
• Corporation Tax accounts for 40% of the total tax gap.
• Failure to take reasonable care (31%), error (15%) and evasion (14%) are among the main behavioural reasons for the overall tax gap.

As announced at Spending Review 2025, £1.7 billion will be provided to HMRC over four years to fund an additional 5,500 compliance and 2,400 debt management staff in order to try and ensure that more of the tax due is paid, to fund public services. 

Starting work this summer? Download the free HMRC app to get your NI number, check your tax code and stay on the right pay.

Young people finishing exams and entering the job market this summer are being urged by HMRC to download the HMRC app. The app is a free tool that can be used to provide quick access to essential employment and tax details. The app has already been downloaded by over 1.2 million people aged 25 and under. The app offers instant access to your National Insurance (NI) number, tax code, pay details and employment history.

This can be very useful information to have on-hand during the summer months when some 40,000 extra young workers are employed each month. Whether you're applying for work in hospitality, retail, leisure or seasonal roles like fruit picking, the app helps you stay job-ready with minimal hassle. Once employed, the app ensures you're on the correct tax code and receiving the right pay under the National Minimum Wage.

More than 146,000 people called HMRC last year after losing their NI number, but it is far quicker to retrieve it via the app where it can also be saved in your phone’s digital wallet. Nearly 90,000 users under 25 downloaded their NI number this way in the 12 months to April 2025.

The HMRC app is available to download, for free from the App Store for iOS and from the Google Play Store for Android. Once signed in, users can access it securely via face ID, fingerprint or a 6-digit PIN.

Young people are also reminded to check their payslips regularly to ensure they’re getting paid what they’re entitled to receive under National Minimum Wage requirements. Any underpayment concerns should be reported to HMRC or ACAS.

Get a clear view of your future pension. Use the enhanced online service to check, boost, or track your State Pension entitlement.

The enhanced Check Your State Pension forecast service is available online, offering a faster and more complete way to understand your State Pension entitlement. This joint service from HMRC and the Department for Work and Pensions (DWP) lets most people under State Pension age see:

• How much State Pension they could get.
• When they can get it.
• If and how they can increase their State Pension, for example, by paying voluntary National Insurance contributions to fill contribution gaps.

The forecast service also highlights any shortfalls in your National Insurance Contributions (NICs) record, allowing you to take action now to boost your future pension income.

You can access the service via www.gov.uk/check-state-pension, where you’ll need to sign in securely using your Government Gateway credentials. If you don’t have them yet, you can create an account. You may need photo ID i.e., a passport or driving licence in order to verify your identity.

You can also view your pension forecast through the HMRC app, giving you secure, on-the-go access.

If you're already receiving or have deferred your State Pension, you’ll need to contact The Pension Service (UK) or the International Pension Centre (abroad) instead.

It is recommended that you regularly check your State Pension position to help optimise your entitlement. You should also consider what other savings or pensions might be required for a long and comfortable retirement.

Struggling with late-paying customers? The VAT Cash Accounting Scheme helps protect cash flow by taxing only what you have received.

The VAT Cash Accounting Scheme is designed to support businesses by improving cash flow. Using this scheme means that VAT is only paid when your customer pays you and not when you issue an invoice. This means that if a customer fails to pay, the VAT is not payable to HMRC, offering a clear advantage for businesses that sell on credit.

In contrast, under standard VAT accounting, VAT is due whether or not you've been paid, which can create financial pressure if your customer is late in paying or does not pay.

To join the scheme, a business must have a VAT taxable turnover of £1.35 million or less in the next 12 months. Once in the scheme, a business can continue using it until their turnover exceeds £1.6 million.

You cannot use the Cash Accounting Scheme if:

• You are behind on VAT returns or payments.
• You have committed a VAT offence in the last 12 months.
• You are using the Flat Rate Scheme, which has its own method for handling VAT on a cash basis.

There’s no formal application required. You can start using the scheme:

• At the beginning of any VAT accounting period, or
• From the start of VAT registration, if you’re newly registered.

You can leave the scheme voluntarily at the end of any VAT period without notifying HMRC and rejoin again if you continue to meet the eligibility criteria.

From April 2024, the cash basis is the default method for sole traders and most partnerships when preparing Self-Assessment returns. Designed to simplify tax reporting, the cash basis lets businesses record income and expenses when money actually moves, easing the admin burden for many. Those who prefer or need traditional accruals accounting must actively opt out when submitting their tax return.

Businesses that prefer traditional accruals accounting or who are ineligible for the cash basis, must opt out of the cash basis when submitting their self-assessment return.

A number of other changes to the cash basis took effect from April 2024. This included the following:

• The removal of the turnover thresholds for businesses to use the cash basis.
• The removal of the restrictions on using relief for losses made in the cash basis, aligning the rules with accruals.
• Interest restrictions have been removed so both cash basis and accruals accounting are subject to the same tax rules.
• People with more than one business are able to choose whether they use the cash basis or accruals accounting for each business they have, rather than having to pick one method for all their businesses.

The cash basis is not available to limited companies and limited liability partnerships.