Tax returns tend to sound more complicated than they really are. The phrase alone can bring up thoughts of long forms, confusing rules, and deadlines that always seem to arrive too quickly. In reality, a tax return is simply a way of telling HM Revenue & Customs about your income and financial activity for a tax year. Once HMRC has that information, they can work out how much tax you should have paid.
What Is a Tax Return?
A tax return is a form submitted to HM Revenue & Customs that explains your income, expenses, and other financial details for a specific tax year. HMRC uses this information to calculate your tax position. That means they check:
- If the correct amount of tax has been paid
- If additional tax is due
- If too much tax has been paid
Most people complete a tax return through Self Assessment. This system is used when tax cannot be fully collected through PAYE.
Who Needs to Complete a Tax Return?
A tax return is not limited to self-employed workers. HMRC may ask for a return in several different situations. You may need to complete one if you:
- Work for yourself as a sole trader
- Operate under the Construction Industry Scheme (CIS)
- Receive income from rental property
- Have income that has not been taxed at source
- Need to report capital gains
- Earn money from investments or dividends above certain thresholds
- Receive a notice from HMRC requesting a return
If HMRC asks for a tax return, it is important to act on it, even if there is no tax to pay.
What Documents Do You Need?
Having the right information ready makes the process much easier. Common documents include:
- P60 forms showing annual pay and tax
- P45 forms from previous employment
- P11D forms for benefits and expenses
- CIS deduction statements
- Records of self-employment income
- Rental income details
- Dividend statements
- Savings and investment records
- Receipts for allowable expenses
Keeping records organised throughout the year helps reduce stress when it is time to file.
What Is a UTR Number?
A Unique Taxpayer Reference (UTR) is a 10-digit number issued by HMRC when someone registers for Self Assessment. It is used to identify your tax records and is required when submitting a tax return. The number is usually shown in a format like 12345 67890, but it remains a single 10-digit reference. If it cannot be found, it is often available in HMRC letters, previous tax returns, or within an online tax account.
Understanding the UK Tax Year
The UK tax year runs from 6 April to 5 April the following year. For example, the 2025/26 tax year covers income earned between 6 April 2025 and 5 April 2026. Everything included in a tax return must relate to the correct tax year, so accurate record keeping is important.
Important Tax Return Deadlines
Missing a deadline can lead to penalties, even if no tax is owed. The key dates are:
- 31 October for paper tax returns
- 31 January for online tax returns
- 31 January for payment of any tax due
Submitting earlier in the year can make the process less stressful and gives more time to plan for any tax bill.
Why Filing Early Can Save You Stress
Leaving a tax return until January often leads to rushed decisions and missing information. Filing earlier in the year gives a clearer picture of your tax position and helps avoid last-minute pressure. It also allows time to gather missing documents and correct any errors before submission. In many cases, early filing simply makes the whole process feel more manageable.
When Help With a Tax Return Makes Sense
Tax returns can be straightforward for simple situations, but things can quickly become more complex when multiple income sources are involved. Self-employment, CIS work, rental income, and investment earnings all add extra layers that need careful reporting. Getting things wrong can lead to delays or unexpected tax bills, so support can make the process easier to manage and more accurate. Express Tax Claims helps take care of tax return preparation and submission, making sure everything is completed correctly and in line with HMRC requirements.
Frequently Asked Questions
- What happens if I register for Self Assessment but don’t submit a tax return?If you register for Self Assessment but do not submit a tax return, HMRC may still expect one. You may receive reminders or penalties unless you submit the return or formally close your Self Assessment account.
- Can I stop being in Self Assessment if I no longer need to file?Yes. If your circumstances change, you can contact HMRC to request removal from Self Assessment. Any outstanding tax returns will still need to be submitted before your record can be closed.
- Do I always need to file a tax return every year once I’m registered?In most cases, HMRC expects a tax return each year once you are in Self Assessment, until they are told your circumstances no longer require it.
- What is the difference between being registered with HMRC and needing a tax return?Being registered with HMRC means your details are on their system. A tax return is only required if you have untaxed income or HMRC has specifically asked you to complete one.
- Do I need to submit a tax return if I had no taxable income?You may still need to submit a return depending on why you are in Self Assessment. If HMRC has requested a return, it should still be completed even if no income was earned.
- Can I correct a tax return after I have submitted it?Yes. HMRC allows you to amend your tax return within a set period after submission if you notice a mistake or need to update information.
- Do I need to include income from side jobs or casual work?Yes. Any taxable income from side work, freelance activity or self-employment may need to be included in your tax return depending on how much you earn.
- How does HMRC receive information about my income?HMRC receives information from employers and other organisations through reporting systems. This may be compared with information submitted on your tax return to ensure accuracy.
- Can I complete a tax return myself without professional help?Yes. Many people complete their Self Assessment directly through HMRC’s online service. Some choose additional support if their tax situation is more complex.
- What should I do if HMRC tells me I needed to file a tax return in the previous year?If HMRC notifies you that a return is required for a previous year, you should register if needed and submit the outstanding return as soon as possible. HMRC may apply penalties depending on how late it is.
