Welcome to the World of Self-Employment!

Hello there! Today, we are diving into one of the most practical and exciting parts of the ACCA Taxation (TX) syllabus: Income from Self-Employment. Whether you dream of starting your own business or plan to advise clients who do, understanding how the taxman views "being your own boss" is essential.

Don't worry if tax feels like a puzzle right now. We are going to break this down into small, manageable pieces. By the end of these notes, you'll understand how to turn business records into a taxable trading profit figure that HM Revenue & Customs (HMRC) is happy with.

1. Is it actually a Business? (The Badges of Trade)

Before we calculate tax, we have to decide: is this person actually "trading," or is it just a hobby? HMRC uses the Badges of Trade to decide.

Analogy: If you sell your old phone once, that's a hobby. If you buy 50 broken phones every month, fix them, and sell them for a profit, you are trading!

Key "Badges" to look out for:

  • Profit Seeking Motive: Did you intend to make money?
  • Number of Transactions: Is this activity happening regularly and systematically?
  • Nature of the Asset: Is it something that can only be turned into money (like commercial stock) or something held for personal enjoyment?
  • Changes to the Asset: Did you repair, modify, or improve the item to increase its market value?

Quick Tip: You don't need all badges to be a trader. Even a single badge, such as a clear profit motive, can establish that a trade exists.

2. Computing Taxable Trading Profits: Cash Basis vs. Accruals Basis

Unincorporated businesses calculate their trading profit using one of two methods:

  • The Cash Basis: This is the default basis for sole traders and partnerships. Under the cash basis, income is recognised when cash is actually received, and allowable expenses are deducted when paid.
  • The Accruals Basis: Applies when an election is made or where the question states that accruals accounts are prepared. We start with the accounting Net Profit and make tax adjustments.

The Adjustment Formula (Accruals Basis)

The core formula is: \( \text{Taxable Trading Profit} = \text{Net Profit} + \text{Disallowable Expenses} - \text{Non-trading Income} - \text{Capital Allowances} \)

Items to ADD BACK (Disallowable Expenses)

These are expenses deducted in the accounts that tax legislation disallows:

  • Depreciation: This is an accounting estimate. Tax relief for capital assets is given through Capital Allowances instead. Always add depreciation back!
  • Personal/Private Expenses: Non-business costs (like personal utility bills or private telephone usage) must be added back.
  • Entertaining: Entertaining customers or suppliers is disallowable. (Entertaining staff is generally allowable).
  • Fines and Penalties: Fines for breaking the law, parking penalties, or late tax penalties are disallowable.
  • Capital Expenditure: Buying plant, machinery, or premises cannot be deducted as an expense; it must be claimed via Capital Allowances.

Items to DEDUCT (Non-Trading Income)

Income received that is taxed under another category must be removed from the trading profit computation:

  • Bank Interest Received: Taxable as savings income.
  • Rental Income: Taxable as property business profits.
  • Profit on Sale of Fixed Assets: Excluded here and assessed under Capital Gains Tax rules.

Did you know? An expense must be incurred wholly and exclusively for the purposes of the trade to be allowable for tax purposes.

3. Capital Allowances

Because depreciation is added back, tax relief on eligible qualifying capital expenditure is provided via Capital Allowances.

Annual Investment Allowance (AIA):

The AIA provides a 100% deduction for most expenditure on plant and machinery (tools, equipment, office furniture, vans) up to a maximum of £1,000,000 per year.

Writing Down Allowances (WDA):

Expenditure exceeding the AIA limit, or assets that do not qualify for AIA, enter pools and receive annual writing down allowances:

  • Main Pool (18%): General plant and machinery, equipment, vans, and qualifying cars.
  • Special Rate Pool (6%): Integral features of a building (such as electrical systems, lifts, air conditioning) and higher-emission cars.

Capital Allowances for Cars:

Cars do not qualify for AIA, but their treatment depends on their \( CO_2 \) emissions:

  • New zero-emission cars: Qualify for a 100% First-Year Allowance (FYA).
  • Second-hand zero-emission cars and cars with \( CO_2 \le 50\text{ g/km} \): Allocated to the Main Pool (18% WDA).
  • Cars with emissions exceeding \( 50\text{ g/km} \): Allocated to the Special Rate Pool (6% WDA).

Private Use Assets: Where a sole trader uses a business asset (such as a car) partly for private purposes, the asset is kept in a single-asset pool. Allowances are calculated in full and then reduced to the business proportion only.

4. Basis of Assessment: Tax Year Basis

Under the tax year basis, sole traders and partners are assessed on the profits of the trade that arise during the tax year (6 April to 5 April).

If an unincorporated business prepares accounts to an accounting date other than 5 April or 31 March (e.g., 31 December), the profits of the accounting periods are time-apportioned monthly into the tax year.

Example: If a trader prepares accounts annually to 31 December, the profits assessed for the 2025-26 tax year (running from 6 April 2025 to 5 April 2026) are calculated using 9/12ths of the profits for the year ended 31 December 2025 plus 3/12ths of the profits for the year ended 31 December 2026.

5. National Insurance Contributions (NIC) for the Self-Employed

In addition to income tax, self-employed individuals pay Class 4 National Insurance Contributions based on their taxable trading profits for the tax year.

Note on syllabus scope: Class 2 NIC is excluded from the ACCA TX-UK syllabus. For the self-employed, only Class 4 NIC is examinable.

Class 4 NIC Computation:

  • Nil: On taxable trading profits up to £12,570.
  • Published percentage rate: Applied to profits between £12,570 and £50,270.
  • Lower percentage rate: Applied to profits exceeding £50,270.

6. Summary and Quick Review

Let's recap the journey of determining self-employment tax liabilities:

  1. Verify trading activity using the Badges of Trade.
  2. Establish whether the Cash Basis (default) or Accruals Basis applies.
  3. Under accruals, start with Net Profit, add back disallowable expenses (depreciation, private use, entertaining), and deduct non-trading income.
  4. Calculate Capital Allowances (100% AIA on qualifying plant and machinery up to £1,000,000, 100% FYA on new zero-emission cars, and 18% or 6% WDA on pools).
  5. Deduct capital allowances to arrive at the Taxable Trading Profit.
  6. Apportion profits if necessary to determine the assessment for the Tax Year.
  7. Compute the resulting Income Tax and Class 4 NIC liabilities.
Key Takeaway:

Taxable trading profit is distinct from accounting profit. Always adjust for disallowable expenditure and capital allowances, and remember that only Class 4 NIC applies to self-employed trading profits.