Top tips for completing your self-assessment tax return

With the deadline for self-assessment tax returns occurring annually at the end of January, people are often left scrambling to avoid fines and get all their taxes in order. To help navigate this chaos, we have put together a handy guide to help you complete next year’s self-assessment and be properly prepared for January 2026.

Deadlines

Not only do you need to complete your self-assessment tax return by 31 January but also you need to pay your outstanding tax bill. Failure to do so will result in an initial fine of £100, followed by incremental increases of five per cent after six and twelve months respectively.

You can make an appeal if you fail to meet this deadline. Each case will be assessed individually, but failure to provide a valid excuse will incur the penalties.

Our first tip for avoiding this is to submit your return ASAP. HMRC has provided an app that allows you to complete your assessment in as little as a minute.

Scams

The rush and chaos of the deadline means scammers will be lurking, waiting to leap in and cash out. Your best bet is to avoid giving away your HMRC details or bank details to anyone. You can find a comprehensive list of scams on the government website.

Use professionals

Navigating the complex world of accounting is difficult enough, let alone at short notice. Seeking out accountants Bristol online is easy, with plenty of options available such as www.chippendaleandclark.com/accountants-near-me/bristol. Even if you didn’t make the 2025 deadline, having professional help in general will help you manage and understand your taxes and prepare for next year.

Future tips

Additional tips to keep in mind could lower your tax bill for the next deadline. Finding all the potential deductions you can claim – through pension relief or donations, for example – will save you money that would otherwise go to HMRC. Professional services remain the best approach for this.

In general, being organised – with both your papers and your time – will help make next year’s deadline hassle-free.