Advanced Taxation (UK) · Taxation effects of the financial decisions made by businesses and individuals

Cash Flow, Payment Dates and Compliance Impact of Tax Decisions

Updated 11 October 2026 · Fact-checked

This topic asks how a choice changes when tax is paid and what you must file. You compare options such as loss relief claims, accounting dates and instalment liability. You work out the tax saved, the payment date and the cash timing, then recommend the option with the best cash result and manageable compliance.

Understand Cash Flow, Payment Dates and Compliance Impact of Decisions

Tax advice is not only about the amount of tax. It is also about when the cash leaves the bank. A relief that saves £10,000 now is usually worth more than one that saves £10,000 in three years. ATX questions often ask you to compare two or more choices and say which gives better cash flow.

Three areas are examined most often. First, loss relief: a trading loss can be used against other income or gains quickly, or carried forward to wait for future profits. Early relief gives a repayment or lower payments sooner. Second, accounting dates: the choice of year end changes which profits are taxed in which year, so it changes payment dates. Third, payment rules: large companies pay corporation tax in quarterly instalments before the year end, while most others pay later.

Compliance is the second half of the answer. Each option brings claims, deadlines, returns and possible interest or penalties. A good answer names the key date, the action needed and the cost of missing it.

The tax tables ACCA gives you include the profit threshold for quarterly instalments (£1,500,000) and the VAT late payment penalty bands. They do not give you every deadline, so you must learn the main dates. Always state your assumptions, because the scenario may not give every date.

Key rules to remember

Quarterly instalment profit threshold: Large company: profits > £1,500,000 (threshold shared by the number of associated companies + 1); The tax table gives £1,500,000. Divide it by the number of associated companies plus one, and reduce it for short accounting periods. Learn the further rules on instalments from your TX-UK knowledge.
Marginal relief for corporation tax: (£250,000 − augmented profits) × 3/200 × taxable total profits ÷ augmented profits; Applies where augmented profits are between £50,000 and £250,000. Small profits rate 19%, main rate 25%. Limits are also divided by associated companies and time-apportioned.
Cap on income tax reliefs: Higher of £50,000 or 25% of income; Applies to certain reliefs, including loss relief against general income for early trading years and some other losses. Check which losses are restricted.
VAT late payment penalty: Up to 15 days: none; 16 to 30 days: 3%; over 30 days: 6% plus daily penalty at an annual rate of 10%; From the tax tables. Use it when a recommendation involves delayed VAT payment.
Personal tax payment on account rule: Two payments on account, each 50% of prior year income tax and Class 4 NIC not collected at source, due 31 January in the tax year and 31 July after it; balance due 31 January after the tax year; Standard TX-UK rule, not in the tax tables. A reduction claim is possible if the current year liability is expected to be lower.

How to solve Cash Flow, Payment Dates and Compliance Impact of Decisions questions

Use this method for any question that asks you to compare options on cash flow or compliance.

1Identify the decision and list each realistic option, such as claim now or carry forward, or year end A or year end B.
2For each option, compute the tax saved or payable using the rates in the tax tables. Show a working for each.
3Work out the date the cash effect arises: the due date of the tax, or when a repayment or lower payment on account is received.
4Compare total tax first, then timing. Say which option is better and by how much, and mention any loss of reliefs such as the personal allowance or a wasted loss.
5State the compliance steps for the chosen option: claim deadline, return, payment dates, and the interest or penalty if missed.
6Finish with a clear recommendation and any assumption, for example that rates stay the same, as the supplementary instructions say.

Quickest way: Option table in four lines

When to use it: Use this when time is short and you must compare two options for cash flow.

Write the tax under each option in two lines of working.
Write the payment date or repayment date next to each figure.
Circle the option with lower tax. If equal, circle the earlier saving.
Add one line on the claim deadline and one on the penalty or interest risk.

Common mistakes in Cash Flow, Payment Dates and Compliance Impact of Decisions

Recommending the option with the biggest tax saving without checking timing.
Students focus on the figure and forget the question asks about cash flow.
Fix: Always give both the amount and the date. Say when each saving is received.
Carrying a loss forward when relief against income would waste the personal allowance, or the reverse without noticing.
Students apply a standard rule without computing the effect.
Fix: Compute the tax under each claim and check whether income falls below the personal allowance, so that allowances are wasted.
Ignoring the cap on income tax reliefs.
The cap is easy to forget in a long scenario.
Fix: For capped reliefs, test the claim against the higher of £50,000 or 25% of income before using it.
Assuming a company with profits above £1,500,000 is always large.
The threshold is learned as a fixed number.
Fix: Divide the threshold by the number of associated companies plus one, and adjust for a short period. Then check profits against the result.
Giving compliance points with no dates or consequences.
Students write 'file on time' as a generic statement.
Fix: Name the deadline, the action and the penalty or interest. Link each to the scenario.

Worked examples

Example 1

A sole trader has a trading loss of £30,000 in 2025/26. In 2024/25 her taxable income was £60,000, all trading profit. In 2025/26 she has only £8,000 of interest income. Ignore NIC. Compare three options: (a) using the loss against 2025/26 income only, (b) claiming against 2025/26 income and then carrying back the balance to 2024/25, and (c) carrying back the whole loss to 2024/25 alone. State the cash effect of each. Assume the loss claims are allowed and the reliefs cap is not breached.

Show the solution

A claim against general income can be made against the income of the loss year (2025/26), the previous year (2024/25), or both. If both are claimed, the loss year is dealt with first. A carry-back does not need a current-year claim, so a carry-back of the whole loss alone is a valid option.
Assume the personal allowance is £12,570 for both years (it is not given in the extract, so this is an assumption). The £8,000 of interest in 2025/26 is fully covered by the personal allowance, so 2025/26 tax is nil whatever you do.
Option (a), 2025/26 claim only: the claim of £8,000 reduces 2025/26 income to nil. No tax is saved, because the interest was already covered by the personal allowance. The personal allowance and savings starting rate are wasted. £22,000 of the loss is left to carry forward against future trading profits, which gives no cash saving now.
2024/25 tax before any claim: taxable income is £60,000 − £12,570 = £47,430. Basic rate band £37,700 at 20% = £7,540. Remainder £9,730 at 40% = £3,892. Total tax £11,432.
Option (b), 2025/26 claim then carry-back: use £8,000 against 2025/26 income (no tax saved), then carry back £22,000 (£30,000 − £8,000) against 2024/25. Income falls to £38,000. Taxable income is £38,000 − £12,570 = £25,430, all in the basic rate band. Tax is 20% × £25,430 = £5,086. Tax saved is £11,432 − £5,086 = £6,346.
Option (c), carry-back of the full £30,000 alone: 2024/25 income falls to £60,000 − £30,000 = £30,000. Taxable income is £30,000 − £12,570 = £17,430, all in the basic rate band. Tax is 20% × £17,430 = £3,486. Tax saved is £11,432 − £3,486 = £7,946.
Compare: (a) saves nil now, (b) saves £6,346 and (c) saves £7,946. Option (c) beats (b) by £1,600. Under (b), £8,000 of loss is used in 2025/26 where it saves no tax. Under (c) the whole loss is used against income taxed at 40% and 20% in 2024/25. In (c) the whole £30,000 is used, so nothing is left to carry forward.

Answer: Option (c) is best. Carrying the whole £30,000 loss back to 2024/25 alone saves £7,946 and gives an early repayment of 2024/25 tax (using the stated personal allowance assumption). Option (b) saves only £6,346 because £8,000 of loss is used in 2025/26, where the income was already covered by the personal allowance. Option (a) gives no immediate cash and leaves £22,000 to wait for future profits. The claim must be made within the statutory time limit.

Example 2

Large Ltd has no associated companies and a 12-month accounting period to 31 December 2025. Taxable total profits are £2,000,000 and the company was not large in the previous period. State whether it pays by quarterly instalments, and the amount of corporation tax due and when.

Show the solution

Threshold for instalments is £1,500,000 with no associated companies. Profits of £2,000,000 exceed this, so the company is large for this period.
Corporation tax: marginal relief does not apply because profits exceed £250,000. Main rate 25% × £2,000,000 = £500,000.
First-year exemption (a learned TX-UK rule, not in the extract): a company that was not large in the previous period is not required to pay by instalments if its profits do not exceed £10,000,000, a limit divided by the number of associated companies plus one. Here there are no associated companies, so the limit is £10,000,000.
Profits of £2,000,000 are below £10,000,000 and the company was not large in the previous period. So no instalments are required.
The £500,000 is therefore due nine months and one day after the period end: 31 December 2025 plus 9 months and 1 day is 1 October 2026.
For comparison only: without the exemption, four instalments of £125,000 (£500,000 ÷ 4) would fall due on the 14th day of months 7, 10, 13 and 16 from the start of the period. That is 14 July 2025, 14 October 2025, 14 January 2026 and 14 April 2026.

Answer: Corporation tax is £500,000. Large Ltd does not pay by instalments because it was not large in the previous period and its profits are below £10,000,000. The full £500,000 is due on 1 October 2026.

Exam tips

Learn the main payment dates, because the tax tables do not give them. Write the date next to each figure in your answer.
When asked to 'advise', give both the numerical comparison and a clear recommendation. Marks are lost for numbers with no conclusion.
Test loss claims against the personal allowance and the cap on income tax reliefs before recommending them.
State assumptions clearly where the scenario omits a rate or date, for example that 2025/26 rates continue as the instructions say.
Add a short compliance point for professional skills marks: the claim time limit, the return, and the penalty or interest for being late.

Practice questions from Taxation effects of the financial decisions made by businesses and individuals

Cash Flow, Payment Dates and Compliance Impact of Decisions: frequently asked questions

When must a large company pay corporation tax by instalments?

A company is large when its profits exceed the £1,500,000 threshold, which is divided by the number of associated companies plus one. Large companies pay in instalments before the period end. Check the first-year exemption rule you have learned from TX-UK.

How do I choose between loss relief options in ATX?

Work out the tax under each claim. Look at the size of the saving, how soon you get it, and whether allowances are wasted. Then recommend the best option and state the claim deadline.

Do payments on account apply to all taxpayers?

They apply to income tax and Class 4 NIC not collected at source. Each payment is 50% of last year's liability. A reduction can be claimed if the current year liability is expected to be lower.

Are VAT late payment penalties in the ATX tax tables?

Yes. There is no penalty up to 15 days late, 3% for 16 to 30 days, and 6% plus a daily penalty at an annual rate of 10% for more than 30 days late.