How Early Can You Submit Self Assessment

By Author: Dhara Tuvar
Total Articles: 11
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Filing a Self Assessment tax return is an essential task for millions of taxpayers in the UK, including self-employed individuals, landlords, and company directors. While HMRC sets clear deadlines, taxes can often feel like a burden many put off until the last minute. Filing early, on the other hand, offers several benefits.

But why wait until the deadline? Let's explore the benefits of Filing your Self-Assessment Tax Return early, from better financial planning to faster tax refunds. In this guide, we’ll cover the key deadlines for 2024/25, why early filing is beneficial, and how you can make the process easier.

Self-Assessment Tax Return Deadlines for 2024/25

Understanding the deadlines is the first step in managing your tax return effectively. Here are the important dates you need to remember:

Self Assessment Registration Deadline

If you are filing a Self-Assessment Tax Return for the first time, you must register with HMRC. This applies to:

Self-employed individuals earning over £1,000 a year.

Company directors with untaxed income.

Landlords earning rental ...
... income.

People earning money from dividends, foreign income, or investments.

Deadline: You must register for Self-Assessment by 5th October 2025 if you need to submit a return for the 2024/25 tax year. Once you register, HMRC will provide you with a Unique Taxpayer Reference (UTR) number, which you will need to complete your tax return.

Paper Tax Return Deadline – 31st October 2025

If you prefer to file a paper tax return, HMRC must receive it by 31st October 2025. Paper submissions take longer to process, and any errors could delay your tax calculation. Most people choose to file online instead, as it’s quicker and easier to manage.

Online Tax Return Deadline – 31st January 2026

The majority of taxpayers file their returns online. The deadline for submitting an online Self-Assessment Tax Return is midnight on 31st January 2026.

Filing online provides multiple benefits:

Instant confirmation that your return has been received.

The ability to edit and correct mistakes before submission.

Automatic tax calculations, so you know exactly what you owe.

Income Tax Payment Deadline

It’s not enough to just submit your return on time—you also need to pay any tax owed by 31st January 2026. This includes:

Income tax based on your earnings.

National Insurance contributions if applicable.

Payments on account (if your tax bill exceeds £1,000).

If you miss this deadline, HMRC will start charging interest the next day. Late payments may also lead to penalties, increasing your overall tax bill. To avoid this, it’s best to calculate and set aside the amount you need to pay well before the deadline.

Why You Should File Your Tax Return Early

1. Faster Tax Refunds

One of the biggest advantages of filing your Self Assessment tax return early is the potential for a quicker tax refund. HMRC typically processes early submissions faster than those filed closer to the deadline.

If you are owed a tax refund, submitting your return early means you can receive the money sooner. This could help you reinvest in your business, clear debts, or treat yourself to something special. Filing early puts you at the front of the queue for processing.

2. Avoiding Last-Minute Errors and Stress

Rushing to complete your tax return at the last minute often leads to mistakes. Common errors include entering incorrect information, missing out on eligible expenses, or miscalculating income.

By filing early, you give yourself ample time to gather the right documents, double-check your entries, and correct any errors before submission. You'll also avoid the panic that comes with trying to beat the Self Assessment tax return deadline.

Taking your time ensures a smoother process, allowing you to submit an accurate and complete return without unnecessary pressure.

3. Access to Accurate Financial Data for Future Planning

Filing your tax return early gives you a clear snapshot of your financial situation for the tax year. This information is invaluable for future financial planning.

Knowing how much tax you owe or whether you're due a refund can help you budget more effectively and make informed decisions about investments, savings, or business expenses.

For business owners, having up-to-date financial data can also make it easier to secure loans or plan for growth. Early filing empowers you with accurate information to take control of your finances.

4. Potential for Lower Accountant Fees During Non-Peak Times

If you use an accountant to file your Self Assessment tax return, early submission can save you money. Accountants are often busier — and may charge higher fees — as the deadline approaches.

By getting your return done early, you can work with your accountant during quieter periods, potentially securing better rates and more personalised support.

5. Reduced Risk of Penalties

Missing the Self Assessment tax return deadline can result in hefty penalties from HMRC. These penalties increase the longer you delay filing or paying your tax.

Here’s a quick breakdown of potential penalties:

1 day late: £100 fine

Up to 3 months late: £10 per day (up to £900) plus the initial £100

6 months late: An additional £300 or 5% of the tax due

12 months late: Another £300 or up to 100% of the tax due in serious cases

Filing early reduces the risk of last-minute issues that could cause you to miss the deadline, helping you avoid unnecessary fines.

6. Better Cash Flow Management

Early filing allows you to plan ahead for any tax payments due. If you owe money to HMRC, knowing the amount early gives you more time to budget and set funds aside.

This can be particularly helpful for self-employed individuals or small business owners who may experience fluctuating cash flow throughout the year. Early awareness of your tax liability helps you avoid unexpected financial strain.

How to Make Filing Your Tax Return Easier

Filing a Self-Assessment Tax Return doesn’t have to be stressful. Here are a few ways to simplify the process:

Keep digital records – Use accounting software or apps to track your income and expenses throughout the year.

Check your tax code – Make sure your PAYE tax code is correct to avoid overpaying or underpaying tax.

Use HMRC’s online system – Filing online is faster, easier, and allows you to make corrections if needed.

Hire an accountant – If your tax affairs are complex, professional help from tax accountants can save time and reduce errors.

Read more at, https://www.goforma.com/tax/how-soon-should-i-submit-my-self-assessment-tax-return

Filing your Self-Assessment Tax Return early is a smart financial move. It reduces stress, improves financial planning, speeds up refunds, and eliminates the risk of penalties. With key deadlines set for 2024/25, the earlier you submit, the better control you have over your taxes.

If you’re unsure about your tax return or don’t want to deal with the process alone, professional help can make things easier. A self-assessment tax return service can handle everything from calculations to submissions, making sure your return is accurate and filed on time.Don’t wait until the deadline—take action today and get expert help to complete your tax return hassle-free!