Fantastic support in guiding me through a complex situation! Rob was brilliant in detailing each section of the process and took our concern and resolved it professionally. The advice was really clear and I can highly recommend Rob and the team.
Self Assessment Tax Returns
Filing your Self Assessment tax return doesn’t have to be a headache. With over 40 years of experience, Mollan & Co can help simplify your personal taxes.
Whether you’re a freelancer, small business owner or landlord, our Yorkshire-based team will guide you through each step of your Self Assessment tax return – from declaring multiple income streams to claiming any deductions you may be entitled to.
With our personalised approach, you can trust that your tax return will be filed accurately, on time, and in compliance with all HMRC regulations.
Contact us today to book your free, no-obligation consultation.
What is a Self Assessment Tax Return?
Self Assessment tax returns are typically filed annually by people whose tax is not dealt with entirely through PAYE, such as sole traders, landlords, partners in partnerships and people with other sources of untaxed income.
These personal tax returns will include information on all types of income earned in the last tax year (from April 6th to April 5th). This may include income from:
• Employment
• Self-employment
• Rental properties
• Investments
• …and more
The Self Assessment tax return will include details of any capital gains or losses incurred during the tax year, and taxpayers can also claim deductions, allowances, and any relevant tax credits or benefits – which can help significantly reduce their final tax bill.
For more information on what information you’ll typically need to complete a personal tax return, see our checklist.
When is the deadline for Self Assessment?
For the 2025/26 tax year, paper tax returns must reach HMRC by 31 October 2026, while online returns must be submitted by 31 January 2027. Any Self Assessment tax you owe is also usually due by 31 January 2027.
If you need to complete a tax return for the 2025/26 tax year and have not sent one before, you should tell HMRC by 5 October 2026. This can also apply if you registered previously but did not need to send a return for the 2024/25 tax year.
If you miss the deadline you may have to pay penalties and interest. If you make a mistake, you may need to correct your return and HMRC may contact you for further information. The best way to avoid this is to work with a tax accountant who can ensure your taxes are filed both accurately and on time.
Do I need to submit a Self Assessment Tax Return?
Whether you need to submit a Self Assessment tax return depends on your individual circumstances and sources of income.
In the UK, you must send a personal tax return if any of the following applied to you during the last tax year:
• You were self-employed as a sole trader and earned over £1,000 before taking off anything you can claim tax relief on
• You were a partner in a business partnership
• You had to pay Capital Gains Tax when you sold something that increased in value
• You were subject to the High Income Child Benefit Charge and do not pay it through PAYE
• You were an off-payroll worker who was repaying a student or postgraduate loan
You may also need to send a tax return if you have any untaxed income from other sources, including but not limited to:
• Income from renting out a property
• Tips or commission
• Income from savings, investments or dividends
• Foreign income
If you’re unsure whether this applies to you, HMRC provides a free tool to check whether you need to submit a Self Assessment Tax Return.
How a Self Assessment accountant can help
• Save Time
Filling in your tax return can be confusing and time-consuming, especially if you have several income sources or investments. Our personal accountants will take this task off your plate, so you can focus on your business.
• Expert Knowledge
As professional accountants with more than 40 years of tax experience, we can help identify potential deductions, allowances and tax credits that you may be eligible for – saving you money on your tax bill.
• Avoid Errors and Penalties
Mistakes on your personal tax returns can lead to penalties, interest charges or even tax investigations by HMRC. Mollan & Co has the expert knowledge to accurately complete your tax return, reducing the risk of errors and ensuring compliance with UK tax law.
• Peace of Mind
Hiring a qualified professional means you can trust your taxes will be filed correctly and on time, reducing stress and helping you sleep easily.
Get in touch today to book your free, no-obligation consultation
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