ACCA Applied Skills · Taxation (UK)

Self-Assessment Systems and the Making of Returns in TX-UK

Self-assessment is the system where taxpayers calculate their own tax and report it to HMRC on a return. To solve questions, work out the key date first, then apply the matching rule: filing, payment, record keeping, enquiry window, interest or penalty. Most marks come from correct dates, time limits and penalty percentages.

What this chapter covers

This chapter covers the administration of UK tax. It explains when returns are due, when tax is paid, what records you keep, how HMRC can check a return, what happens if you pay late or get it wrong, and how you challenge a decision or reclaim tax. There is very little calculation. Most of the work is knowing dates, time limits and percentages.

The chapter applies to individuals, and many of its rules have a parallel for companies. Keep the two apart as you learn. Individuals use 31 January and 31 July dates, while companies work from their accounting period. Do not mix the two sets of rules.

It links to the rest of TX-UK. Payments on account depend on the income tax liability you calculate in the income tax chapters. VAT has its own penalty regime, and the late payment table in the rates and allowances sets it out. Penalties for errors apply to any tax. Expect objective test questions on this chapter, and short written parts in Section C asking for dates, deadlines or penalties.

This chapter is among the most learnable in TX-UK. The rules are fixed, short and rarely change, so a disciplined student can win nearly every mark. Objective test questions are marked all or nothing, so a wrong date or percentage costs the full mark. The rates for interest and for penalties for errors are given in the tax rates and allowances. You still need to know how to apply them and which behaviour category fits the facts. The same ideas also appear as add-on parts of larger Section C questions, so a weak grasp loses marks in questions on other topics.

The systems for self-assessment and the making of returns: topics in the order to study them

1Self-Assessment Tax Returns and Filing DeadlinesStart here because the return and its deadlines are the base for every later date, time limit and penalty.
2Payments on Account and Balancing PaymentsThis is the only calculation-heavy topic, and it follows naturally once you know the filing and payment dates.
3Record Keeping RequirementsA short topic that is easy to learn now and gives quick marks on retention periods.
4HMRC Enquiries, Amendments and Discovery AssessmentsThese rules depend on the filing date you have already learned and introduce the time limits for checks.
5Interest and Penalties for Late Payment and ErrorsLearn this after enquiries, because penalties for errors depend on what HMRC finds and on the taxpayer's behaviour.
6Appeals, Reviews and Claims for Overpaid TaxFinish with how to challenge HMRC decisions and reclaim tax, which pulls the whole system together.

How to prepare The systems for self-assessment and the making of returns

Treat this chapter as a set of dates, time limits and percentages. Build a one-page table, then practise applying it to short scenarios.

Draw a timeline for one tax year. Mark 5 October for notifying chargeability, 31 October for paper returns, 31 January for online returns and the balancing payment, and 31 July for the second payment on account.
Practise payments on account. Each is normally 50% of the previous year's income tax and Class 4 NIC liability that was not collected at source. For example, a liability of £8,000 gives two payments of £4,000 each. Learn the conditions under which no payments on account are due.
Learn the time limits as a list: record retention, HMRC's enquiry window, the taxpayer's right to amend, discovery assessment periods and the claim period for overpaid tax. Say each one aloud until it is automatic.
Learn the error penalty table from the rates and allowances. Then practise classifying a scenario as careless, deliberate but not concealed, or deliberate and concealed. Note that the minimum depends on whether disclosure was unprompted or prompted.
Use the given interest rates: 8.5% on underpaid tax and 3.5% on overpaid tax. Practise a simple interest calculation for a number of months, and remember the exam tells you the rates are assumed.
Do mixed objective test questions and then Section C past parts on this chapter. Write short, direct answers that state the rule and then apply it to the facts given.

Common mistakes in The systems for self-assessment and the making of returns

Mixing up individual and company deadlines.
Fix: Learn the two regimes on separate lists. Individuals work from the tax year and 31 January. Companies work from the end of the accounting period.
Calculating payments on account on the current year's liability.
Fix: Base each payment on the previous year's liability, then take the balancing payment as the difference after the current year is known.
Forgetting the conditions that switch payments on account off.
Fix: Always check the prior year's liability and the amount collected at source before you calculate anything.
Choosing the wrong penalty category or the wrong minimum.
Fix: First decide the behaviour from the facts, then decide whether HMRC or the taxpayer raised the error, then read off the percentage.
Confusing the time limits for different actions.
Fix: Keep a single table of time limits and start each answer by naming the action and its period before applying it.
Giving vague answers in written parts.
Fix: State the rule with its exact figure, then apply it to the dates in the scenario in one or two short sentences.

Last-day revision: The systems for self-assessment and the making of returns

Online returns are due by 31 January after the tax year. Paper returns are due by 31 October.
The balancing payment and the first payment on account are due on 31 January. The second payment on account is due on 31 July.
Each payment on account is normally 50% of the prior year's income tax and Class 4 NIC liability that was not collected at source.
No payments on account are due if the prior year's income tax and Class 4 NIC liability was below £1,000, or if over 80% of the prior year's income tax liability was collected at source.
Business records are kept for five years after the 31 January filing date. Non-business records are kept for one year after that date.
Companies keep records for six years from the end of the accounting period.
HMRC's enquiry window for a return filed on time is 12 months from the actual filing date. For a late return, the window ends on the next quarter day (31 January, 30 April, 31 July or 31 October) after the first anniversary of the filing date.
Discovery assessments can be made up to four years after the end of the tax year to which they relate. This extends to six years for carelessness and 20 years for deliberate behaviour. All the periods run from the end of that tax year.
Interest rates given: 8.5% on underpaid tax and 3.5% on overpaid tax.
Penalties for errors: maximum 30% careless, 70% deliberate but not concealed, 100% deliberate and concealed.
A claim for overpaid tax is normally made within four years of the end of the tax year.
You can appeal against an HMRC decision in writing within 30 days of the date of the decision notice. You can ask for an internal HMRC review or appeal to the tax tribunal.

The systems for self-assessment and the making of returns practice questions

The systems for self-assessment and the making of returns in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

The systems for self-assessment and the making of returns: frequently asked questions

What are the main self-assessment deadlines in TX-UK?

An online return is due by 31 January following the end of the tax year, and a paper return by 31 October. The balancing payment and first payment on account are due on 31 January, and the second payment on account on 31 July.

How are payments on account calculated?

Each payment is normally 50% of the previous year's income tax and Class 4 NIC liability, excluding amounts collected at source. They are not required if the previous year's liability was below £1,000 or over 80% was collected at source. Any difference is settled by the balancing payment.

Do I need to memorise the interest rates and penalty percentages?

The assumed interest rates and the penalties for errors are provided in the tax rates and allowances, so you do not need to memorise the numbers. You must know how to apply them and how to classify the taxpayer's behaviour. The record keeping periods and time limits are not given, so learn those.

How is this chapter tested?

It is tested mainly through objective test questions on dates, time limits and penalties. It can also appear as short written parts in Section C, usually alongside an income tax or company question. Marks come from accurate rules applied to the facts given.