The Easiest Way To File Self Assessment Tax Returns In 2025

By Author: James Smith
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Filing your Self Assessment tax return can feel like a stressful job, especially if you are self-employed, a landlord, or earn income outside of PAYE. But it does not have to be hard. With the right steps and tools, you can file your return easily and on time, without the panic that many face in January.

The 2025 tax year brings some changes, and being ready early will save you time, reduce stress, and help avoid mistakes or fines. In this blog, we’ll look at the easiest way to complete your Self Assessment, the deadlines you need to know, and how digital tools can make the whole process smoother.

Who Needs to File a Self Assessment?
People who are self-employed or sole traders.
Those who rent out property and earn over £1,000 in rental income.
Company directors who earn income outside of PAYE.
People who earn income from savings, investments, or foreign income.
Anyone earning more than £100,000 in a year.
People claiming reliefs or reporting capital gains.

Key Dates for 2025
6 April 2025 – Start of the new tax year.
5 October 2025 – Deadline to register ...
... for Self Assessment (if it’s your first time).
31 October 2025 – Deadline for paper tax return submission.
31 January 2026 – Deadline to file online and pay any tax you owe.

What You Need Before You Start
Your Unique Taxpayer Reference (UTR) number.
Your National Insurance number.
Records of all income (invoices, payslips, bank interest, rent).
Records of all business expenses and costs.
P60, P45, or details of PAYE income (if you had employment).
Details of pension contributions or charity donations.

A working Government Gateway account or HMRC-recognised software.

What You Can Claim as Expenses
Office supplies, internet, and phone use.
Travel costs like fuel, parking, or public transport.
Rent or use of home if used for work.
Staff wages or contractor payments.
Tools or equipment used in your trade.
Business insurance or bank charges.

Common Filing Mistakes to Avoid
Missing the deadline and getting fined.
Entering the wrong income or forgetting extra earnings.
Forgetting to include tax reliefs or expenses.
Not keeping proof of claims or records.
Using outdated or incorrect forms.

What If You File Late?
You will get a £100 fine even if no tax is owed.
Extra fines if you are 3, 6, or 12 months late.
Interest may be added to unpaid tax.
You may face more checks from HMRC.

Tips to Make Filing Easier

Keep records and receipts organised throughout the year.
Use digital tools to track income and expenses.
File early – do not wait until January.
Review your return for errors before submitting.
Ask for help from an accountant if needed.

Why Filing Early Is Better

You will know how much you owe sooner.
You have more time to plan or budget for payment.
If you are owed a refund, you will get it faster.
Less stress when January comes.
Easier to get help if there’s a problem.

What’s New for 2025?
More people will be included under Making Tax Digital (MTD) in coming years.
Digital record-keeping is now encouraged by HMRC.
Software must meet HMRC standards if used for filing.
Self Assessment rules may be updated, so keep an eye on GOV.UK.

Ways to File Your Self Assessment

Paper Form – Only if sent by post before 31 October.
HMRC Online Account – Basic, but good for simple returns.
HMRC-recognised Software – Best for self-employed, landlords, or those with complex returns.

Why Use Software Instead of Doing It Manually?

Less chance of errors in figures or claims.
Reminders for key dates and tasks.
Easy to upload records, receipts, and statements.
Safer than paper forms, with secure backups.
Sends your return directly to HMRC.

Why Nomi Makes Filing Self Assessment Easy
Nomi is a smart accounting tool made for UK self-employed people, landlords, and small businesses. It helps you manage income, track expenses, and file your tax return with ease – all from one simple dashboard.

With Nomi, You Can:
File Your Self Assessment Online
Submit your return directly to HMRC from the platform.

Track Income and Costs Year-Round
Stay ready for tax time with clear records all in one place.

Claim the Right Expenses
Tools help you see what you can claim and keep proof safe.

Avoid Deadlines and Fines
Reminders make sure you file on time and stay compliant.

Work from Anywhere
Use Nomi on your laptop or phone – all your info stays in the cloud.

Save Time and Stress
No more digging through papers or typing out forms.

Get Friendly Support
Helpful team ready to guide you if you get stuck.

Conclusion
Filing your Self Assessment tax return in 2025 does not need to be stressful. With early planning, good record keeping, and the right software, the whole process becomes much simpler. Avoid mistakes, stay on top of deadlines, and take control of your tax duties.

Nomi is the easy way to file your Self Assessment return – made for real people who want to save time and stay on track.

Visit us to know more about self-assessment software-
https://www.nomi.co.uk/what-we-do/self-assessment-partnership-tax-software-for-accountants-bookkeeepers/