When tax season rolls around, it’s common for business owners and self-employed individuals to panic at the thought of the process. With over 12 million people filing a Self-Assessment tax return in the UK each year, it’s clear that understanding the process is important. At St Accountancy, we aim to simplify tax for businesses in Ipswich and across East Anglia, so you can focus on growth rather than getting bogged down by numbers.
Whether you’re filing for the first time or want to streamline your process, this guide will break down the key steps of how to do a tax return. Plus, we’ll explain how expert guidance from our tax advisor Ipswich team can make all the difference.
Key Takeaways
- Filing a tax return in the UK requires accurate record-keeping, timely submissions, and compliance with HMRC’s Self-Assessment system.
- You must file a Self-Assessment if you’re self-employed, earn over £100,000, have untaxed income, or need to report capital gains.
- Completing a tax return typically takes between one to five hours, depending on the complexity of your finances and your preparation. Some can take over a week if especially complicated.
- Common mistakes, such as missing deadlines, entering incorrect figures, or failing to claim allowances, can lead to penalties or overpayment.
- Working with ST Accountancy ensures your tax return is submitted accurately and efficiently, saving you time, stress, and potential costs.
Understanding the UK Tax Return System
The UK tax return process is governed by HM Revenue and Customs (HMRC) through what’s called the ‘Self-Assessment system.’ This system is designed for those whose tax isn’t collected automatically through PAYE, such as self-employed individuals, landlords, and company directors.
Through Self-Assessment, you must declare your income, calculate what you owe, and pay any outstanding tax directly to HMRC. It’s a system that requires precision and compliance with strict deadlines, but also offers opportunities to claim allowances and reduce your overall tax liability.
How to Do a Tax Return
Gathering Key Documents
Before diving into your tax return, it’s important to gather all the relevant paperwork. This includes:
- Unique Taxpayer Reference (UTR) and National Insurance number
- P60s, P45s, and P11Ds from employers
- Records of all income sources (employment, self-employment, rental, dividends, pensions, etc.)
- Proof of expenses (particularly if self-employed)
- Bank statements
- Evidence of pension contributions, charitable donations, and student loan repayments
Getting everything in order from the start can save hours later and reduce the risk of mistakes.
Using HMRC Online Services
Most people choose to file online using HMRC’s platform. It’s user-friendly, calculates your tax automatically, and offers a longer deadline (31 January compared to 31 October for paper submissions). You’ll need to set up a Government gateway account if you haven’t already, which you’ll use each year to log in a file.
Avoiding Common Mistakes
The most frequent errors include missing deadlines, entering incorrect figures, or forgetting to claim allowable expenses. These can lead to fines, delays, or overpaying of tax. Double-check everything and, when in doubt, seek professional advice. Our tax services in Ipswich ensure everything is accurate and compliant.
Determining If I Need a Self-Assessment
Not everyone in the UK needs to file a Self-Assessment. Typically, you must file a tax return if you:
- Are self-employed or in a business partnership
- Have rental income or untaxed earnings
- Have made capital gains (e.g., from selling shares or property)
- Earn over £100,000 a year
- Need to claim certain reliefs or allowances
Even if you’re unsure whether you qualify, it’s better to check early, HMRC requires you to register for Self-Assessment by 5 October following the end of the tax year.
How Long Does a Tax Return Take to Complete
Factors Affecting Time
A Which? Survey found that the average time to complete a tax return is about two and a half hours. But this can vary significantly. If your finances are straightforward and your documents are ready, it can take under an hour. More complex situations (multiple income streams, investments, reliefs) may require a week or more.
Online vs. Paper Submissions
Filing online typically saves time and ensures faster processing and fewer errors. You’ll also benefit from automatic tax calculations and instant submission confirmation. In contrast, paper submissions can take longer to prepare and may not be processed for up to six weeks, especially during the busy January rush.
Essential Tips for Filing a Self-Assessment Tax Return
Key Deadlines
- Paper returns: 31 October
- Online returns: 31 January
- Tax payments: 31 January (balancing payment) and 31 July (second payment on account)
Preparing for Payment
If your tax bill exceeds £1,000, and you haven’t paid at least 80% of your tax via PAYE, you may need to make Payments on Account. These are advance payments towards the next tax year, which are due in two instalments. Plan ahead to avoid surprises.
Avoiding Delays When You Submit a Tax Return
Staying Organised
Having a clear filing system for receipts, invoices, and statements can save a lot of time. Digital tools like cloud accounting software can help, or you can let ST Accountancy manage it all for you.
Checking for Errors
Always review your return before submission. HMRC penalties for errors can be steep, and incorrect entries may trigger time-consuming checks. Double-check your income, deductions, and bank details.
Tax Return Submission Mistakes to Avoid
- Missing deadlines
- Forgetting to declare all income sources
- Not claiming eligible allowances
- Using estimated figures without evidence
- Not keeping records
These mistakes can lead to fines or missed opportunities to reduce your tax bill. ST Accountancy helps clients in Ipswich and beyond avoid these pitfalls with expert support.
Conclusion
Filing a tax return is a legal obligation, and getting it right is essential for avoiding fines, protecting your finances, and making the most of any available tax relief. With accurate documentation, timely action, and expert oversight, what can seem like an intimidating process becomes a strategic financial step.
At ST Accountancy, we provide authoritative, professional support to ensure your Self-Assessment is completed accurately and efficiently. From helping you gather the right documents to advising on allowable deductions and avoiding costly mistakes, our Ipswich-based team is here to handle the details. Contact us today and take control of your tax responsibilities with confidence.
FAQs
Who is eligible for a tax return in the UK?
You must file a Self-Assessment tax return if you’re self-employed, have untaxed income, earn over £100,000, or need to report capital gains or claim specific tax reliefs.
Does HMRC automatically refund overpaid tax?
Yes, if you’ve overpaid, HMRC will issue a refund. Online submissions tend to be processed faster, with refunds usually arriving within 1–2 weeks. Paper returns can take 4–6 weeks or more.
If you’re still unsure how to file a tax return or need guidance specific to your situation, our team at ST Accountancy is always here to help. Book a consultation and let our Ipswich-based experts take care of your Self-Assessment today.