The deadline for filing your 2025/26 Self Assessment tax return online is 31 January 2027. While that may still feel some way off, starting early can make the process much easier.
Completing your return well ahead of the deadline can help you understand your tax position sooner, budget for any tax due and avoid unnecessary last-minute pressure. If you file a paper return, the deadline is earlier, on 31 October 2026.
Here are six reasons why it’s worth getting ahead:
1. Understand your tax liability sooner
One of the biggest advantages of preparing your return early is knowing exactly how much tax you’ll need to pay.
Submitting your return doesn’t mean paying your tax bill straight away – you’ll still have until 31 January to make any payment due. For many people, this also includes the first payment on account towards next year’s bill, which can make the total higher than expected.
Filing early gives you a clear picture of the full amount and more time to prepare for it.
2. Improve your financial planning
Knowing your tax position in advance can help you make better decisions about your money.
Whether you’re self-employed, a landlord or receive other untaxed income, knowing what you’ll owe helps you manage cash flow and avoid surprises later in the year.
3. Receive any refund sooner
If you’ve paid too much tax during the year, filing early means HMRC can process your refund sooner. You don’t have to wait until January to claim money you’re owed.
4. Pay through your tax code
If you’re employed or receive a pension and owe less than £3,000, you may be able to have the tax collected through your PAYE tax code. This means you won’t have to pay the full amount as a lump sum, helping you spread the cost across the following tax year.
To do this, you’ll need to file your return online by 30 December 2026.
5. Give yourself time to gather information
Many tax returns require information from several sources, such as banks, investment providers, employers or property records.
Starting early gives you time to collect what you need and resolve any gaps, rather than rushing in January when HMRC and tax advisers are at their busiest. It also reduces the risk of mistakes caused by working to a tight deadline.
6. Create opportunities for proactive advice
Preparing your figures earlier gives your adviser more time to review your position, identify planning opportunities and ensure you’re making the most of any available reliefs.
The sooner conversations start, the more time there is to consider your options and make sure nothing is missed before the deadline.
Start preparing now
If you know you’ll need to complete a Self Assessment tax return, now is a good time to begin gathering your records and reviewing your income and expenses for the year. Taking action early means you can approach January with a clear view of what you owe and when.
Need support with your Self Assessment?
Our tax team can support you throughout the Self Assessment process, from preparing your return to understanding what you owe and planning for any payments due.
If you’d like support with your Self Assessment tax return, contact Julie Walsh by clicking the button below.
