The systems for self-assessment and the making of returns

Welcome to the World of Self-Assessment!

Hello! If you’ve ever wondered how the UK government actually collects tax from millions of people without checking every single person's bank account every day, you’re in the right place. This chapter is all about Self-Assessment—the system where the "burden of proof" is on the taxpayer. In simple terms, HMRC (the tax office) says: "You tell us how much you earned, and we’ll check if you're right later."

This might sound a bit intimidating, but don't worry! We are going to break down the dates, the rules, and the penalties into bite-sized pieces. Think of this as the "rules of the game." Once you know the rules, the rest of Taxation becomes much easier to manage.

1. Who Needs to File a Return?

Not everyone needs to fill out a tax return. If you are an employee and all your tax is taken out of your paycheck via PAYE (Pay As You Earn), you might never see a tax return. However, you must notify HMRC that you need to file a return if you have:

• Income from self-employment.
• Significant rental income.
• Savings income or dividends that aren't fully covered by your allowances.
• Complex tax affairs (like high earners or those with Capital Gains).

Important Deadline: If you have a new source of income, you must tell HMRC by 5 October following the end of the tax year. For example, if you started a business in June 2023 (the 2023/24 tax year), you must tell them by 5 October 2024.

2. The "When": Filing Deadlines

The UK tax year runs from 6 April to 5 April. Once the year ends, the clock starts ticking for your tax return.

The Two Golden Dates

There are two ways to file a return, and each has its own deadline:

1. Paper Returns: These must be submitted by 31 October following the tax year.
2. Electronic (Online) Returns: These must be submitted by 31 January following the tax year.

Example: For the 2023/24 tax year (ending 5 April 2024):
• Paper deadline: 31 October 2024
• Online deadline: 31 January 2025

Pro-Tip: Most people file online because it gives them three extra months to get their paperwork together!

Key Takeaway

31 October for paper, 31 January for online. If you miss these, HMRC will start charging you penalties immediately!

3. The "How": Payments on Account

This is often the trickiest part for students, so let’s use an analogy. Imagine you are at a restaurant. Instead of paying the whole bill at the end, the waiter asks you to pay half of what you spent last time halfway through your meal, and the other half just as you finish. That is Payments on Account (POA).

HMRC wants its money sooner rather than later. If your tax bill last year was high enough, you pay for the current year in two installments:

• 1st Payment on Account: 31 January (during the tax year).
• 2nd Payment on Account: 31 July (after the tax year ends).
• Final Balancing Payment: 31 January (following the tax year).

How much is a POA?

Each POA is exactly 50% of the previous year’s "relevant" tax liability.
The formula is: \( \text{POA} = 0.5 \times (\text{Income Tax} + \text{Class 4 NIC}) \)

Did you know? You don't have to make POAs if your tax bill for the previous year was less than £1,000 or if more than 80% of your tax was already collected at source (like through your salary).

Common Mistake to Avoid

Students often forget that 31 January is a "Double Deadline Day." On this day, a taxpayer might be paying the Final Balancing Payment for the old year AND the 1st Payment on Account for the new year. It’s an expensive day!

4. Penalties: When Things Go Wrong

HMRC is quite strict about deadlines. There are two types of penalties: Late Filing (forgetting the paperwork) and Late Payment (forgetting the money).

Late Filing Penalties

• 1 day late: Fixed penalty of £100 (even if you owe no tax!).
• 3 months late: £10 per day (for up to 90 days).
• 6 months late: An additional 5% of the tax due or £300 (whichever is higher).
• 12 months late: Another 5% or £300 (whichever is higher).

Late Payment Penalties

These are charged at 5% intervals on the tax that remains unpaid:
• 30 days late: 5% of unpaid tax.
• 6 months late: 5% of unpaid tax.
• 12 months late: 5% of unpaid tax.

Interest: On top of penalties, HMRC charges interest on any tax paid late, calculated from the date the tax was due until the date it is actually paid.

5. Record Keeping and HMRC Powers

HMRC doesn't just take your word for it forever; they have the power to check your "homework."

Keeping Records

Taxpayers must keep their records (receipts, invoices, bank statements) for a specific time:
• Business/Self-Employed: 5 years after the 31 January deadline.
• Non-business (Individuals): 1 year after the 31 January deadline.

HMRC Enquiries

HMRC can start an "Enquiry" into a return. They usually have 12 months from the date the return was filed to do this. Think of an enquiry as a "spot check" to ensure everything is accurate.

Determinations

If you simply don't send in a tax return, HMRC can issue a "Determination." This is their best estimate of what you owe. You can’t appeal a determination, but you can "override" it by finally sending in your actual tax return.

Quick Review Box

1. Notify HMRC: By 5 October.
2. Paper Deadline: 31 October.
3. Online Deadline: 31 January.
4. Payments on Account: 31 Jan and 31 July (50% of last year's bill each).
5. Records: 5 years for business, 1 year for non-business.

Don't worry if the dates seem overwhelming! Just remember that 31 January is the "Main Event" for almost everything in Self-Assessment. If you remember that date, you're halfway there!