Introduction
Should you miss a filing deadline, you can be subject to penalties, interest charges, and a great deal of needless worry. Understanding Tax Year Dates 23/24 is thus quite crucial. Whether your firm is small or you work as a freelancer or just handle your finances, knowing these important dates will enable you to keep ahead.
We’ll go over how the Tax Year Dates 23/24 effect your filing deadlines, discuss typical pitfalls to avoid, and offer doable actions to make tax season as smooth as possible in this post.
Appreciating the Tax Year Dates 23/24

Unlike in many other nations, the tax year in the UK does not span from January to December.
Rather, it spans April 6th, one year, till April 5th, the next year.
- For the 23/24 Tax Year Dates, the crucial chronology is:
- The starting date is April 2023, 6 April.
- Ending Date: April 5, 2024
- Your 23/24 tax return will include every dollar you make, every expense you claim, and every allowance you apply throughout this period.
You might find it odd why the UK dates are such strange ones. Historically, this relates to mediaeval times and calendar system modifications. The key thing to keep in mind, though, for the taxpayer of today is that the tax year always runs from April 6 to April 5.
If you’re unsure about what tax code you’re on or how it affects your income, check out our guide on How to Check Tax Code Quickly and Correctly. It can help you avoid costly mistakes and ensure your tax return is accurate.
Knowing the Tax Year Dates 23/24 Matters: Why?
You could think, “Sure, I’ll just file when it’s time — no big deal.”
The issue is that missing crucial dates connected to Tax Year Dates 23/24 could result in immediate fines, extra interest on unpaid taxes, and perhaps HMRC investigations.
An actual illustration?
Once neglecting the tax deadlines, Tom, a Manchester freelancing graphic designer, thought he would get a reminder. Two months late already by the time he checked. He paid over £300 in fines, money he might have saved if he had just kept on top of the Tax Year Dates 23/24.
Important Deadlines Connected to Dates of Tax Year 23/24
Here are the critical filing and payment deadlines you cannot afford to overlook if you’re working within the Tax Year Dates 23/24:
- If you self-employed or must file for the first time, October 5, 2024 is the deadline to register for the self-assessment.
- The deadline for turning in a paper Self-Assessment tax return is 31 October 2024.
- The deadline for completing an online Self-Assessment tax return and paying any tax due for the 2023/24 Tax Year is 31 January 2025.
- Keep in mind, these extra dates should you also pay on account:
- January 31, 2025: First account payment due.
- 31 July 2025: Due second payment on account.
- Even if you owe no tax, missing any of these deadlines could cause automatic penalties.
Step-by-step guide on how to keep on top of 23/24 tax year dates

Although negotiating the tax system can be intimidating, it is not so if you divide it into reasonable chunks.
1. Keep Good Notes All Year Long.
Beginning on April 6, 2023, start compiling all crucial financial records.
This covers invoices, receipts, bank statements, and evidence of expenses.
Accurate and simpler completion of your tax return will result from good record-keeping.
2. Register with HMRC, should yohave u havehave have not already
Should you launch a firm, go self-employed, or generate untaxed income during the 2023/24 Tax Year, you have to register with HMRC by 5 October 2024.
Online registration is really simple. Don’t wait until the last minute; delays could make filing on time difficult.
3. Decide on Your File Methodology.
Choose early whether you will send your return online or by paper.
Although paper returns have to be sent in by October 31, 2024, internet entries give you until January 31, 2025, thereby allowing additional time to correct your calculations.
Online filing is the best option if you wish the longest period.
4. Get ready for account payment calls.
Should your 2023/24 Tax Year show more than £1,000, you might have to make advance payments towards the amount for next year.
Due in January and July, each payment is around half of your tax amount from the previous year.
Adjust your budget to avoid running short when these additional expenses show up.
Typical Errors People Made Using 23/24 Tax Year Dates
- If you’re not careful, mistakes are really easy. Among the most often encountered problems are:
- Assuming the tax year runs according to the calendar year, it does not. Always refer to the official dates.
- Not declaring extra income: You have to report even side projects or informal freelancing jobs
- Missing deadlines for payments on account: Although they are easy to forget, these extra payments are necessary to avoid penalties.
- Assuming the timelines are flexible, they are not. Late payments and returns cause severe fines imposed by HMRC.
- Knowing these errors will enable you to keep the 2023/24 Tax Year on the correct course.
How Late Filing Penalties Work
- Should you miss your Tax Year Dates 23/24 filing dates, you could have to deal with:
- £100 rapid fine following the deadline
- The extra penalty of £10 every day for three months, up to £900.
- Additional fines of six and twelve months.
- Interest on any outstanding tax debt
- The system is meant to motivate timely filing and payment, hence, it is imperative to keep ahead of deadlines.
Advice on simplifying filing fothe r the tax year 23/24

- Start Early: Soon after April 5, 2024, start working on your figures.
- Use online accounting tools to automate much of the labour and integrate with HMRC using QuickBooks or Xero.
- See a tax professional if your taxes are tricky to save you both time and money.
- Set several reminders using your phone, email notifications, or an actual calendar.
- Although filing taxes may never be “fun,” if you keep organised it won’t be stressful either.
Final Checklist with 23/24 Tax Year Dates
- Save all of your financial records from April 6, 2023, to April 5, 2024
- By October 5, 2024, register for self-assessment (if necessary).
- Send a paper return by October 31, 2024 (should you so want).
- Online returns by January 31, 2025
- Pay your 31 January 2025 tax owing.
- If called for, arrange for payments on account.
FAQs
Why does the UK tax year start in April?
The UK tax year starts in April due to historical calendar changes dating back to the 18th century. The start date of 6th April has remained since the shift from the Julian to the Gregorian calendar. You can read more about it here.
When is the deadline to file my 2023/24 tax return online?
The deadline to file your online tax return for the 2023/24 tax year is 31st January 2025. Paper returns must be filed by 31st October 2024.
What happens if I miss the tax return deadline?
If you miss the deadline, HMRC will automatically issue a £100 fine. Additional penalties apply if your return is more than 3, 6, or 12 months late. You may also be charged interest on any unpaid tax.
Can I file my tax return before the deadline?
Yes! You can file your return as soon as the tax year ends (after 5th April 2024). Filing early helps you avoid stress and gives you more time to budget for any tax owed.
Final Thought:
Learning the Tax Year Dates 23/24 is about safeguarding your money, avoiding penalties, and feeling confident throughout tax season, not only about following guidelines.
Start early, keep neat, and go one step at a time through your taxes.
Keeping track of the Tax Year Dates 23/24 and planning correctly can help you ensure that your financial year finishes without any needless penalties or stresss.