Self-Employed
Financial informationMerranti

Self-Employed: What Expenses Can You Deduct?

For self-employed individuals, ensuring that all allowable expenses are deducted from taxable profits is essential for minimizing tax liabilities. Failing to claim the right expenses can result in paying more tax than necessary. Understanding which costs are deductible and how to record them properly can make a significant difference to your tax bill.

General Rule for Deductible Expenses

The basic principle for allowable expenses is that costs must be incurred “wholly and exclusively” for business purposes. This means that if an expense is entirely for running your business, it can be deducted from your taxable profit.

Unlike employment expenses, there is no requirement for the expense to be necessary, only that it is for business purposes.

Private Expenses vs. Business Expenses

Private Expenses

Private expenses cannot be deducted when calculating taxable profit. To avoid confusion between business and personal spending, it is best to:

  • Use a separate business bank account.
  • Have a dedicated business credit card.
  • Avoid mixing personal and business purchases.

For example, if you purchase office stationery and a personal magazine on the same receipt, only the stationery cost is deductible. Keeping clear records ensures that private expenses are excluded.

Mixed Expenses: Partial Deductions

Some expenses have both business and personal use. In these cases, only the business portion can be deducted.

Examples of Mixed Expenses

  • Mobile phone bills: If 70% of calls are for business, then 70% of the total cost can be deducted.
  • Car usage: If a car is used for both work and personal trips, a mileage-based deduction can be used instead of apportioning fuel and maintenance costs.

Apportionment Method

HMRC allows costs to be split on a reasonable and justifiable basis.

For example:

  • A mobile phone bill of £800 where 72% of calls are business-related allows a £576 deduction (£800 x 72%).
  • If using simplified mileage expenses, deductions are based on:
    • 45p per mile for the first 10,000 miles in a tax year.
    • 25p per mile for any additional miles.

Dual-Purpose Expenditure

Expenses that serve both a business and a personal function but cannot be separated are not deductible.

Examples of Non-Deductible Dual-Purpose Costs

  • Everyday clothing: Even if worn only for work, normal clothing is not deductible as it provides warmth and decency, which are private benefits.
  • Reading glasses: If used for both business and personal reading, they cannot be deducted.

However, some costs can be claimed if they are business-specific, such as:

  • Uniforms with a business logo – These are deductible, but plain work clothes are not.
  • A separate pair of glasses used only for business tasks – This would be deductible as there is no dual use.

Incidental Private Benefit

Some expenses may provide a minor private benefit but still qualify as fully deductible.

For example:

  • A business trip to meet a supplier abroad is deductible, even if you enjoy good weather during your stay.
  • Using a home office for work, even if you live there, can still allow a business-use deduction.

Tax-Saving Allowances and Simplified Expenses

Trading Allowance (£1,000)

  • If total self-employed income is less than £1,000, there is no need to report it to HMRC.
  • If income exceeds £1,000, the trading allowance can be used as a flat deduction instead of claiming actual expenses.
  • This is useful when expenses are below £1,000, as it saves tax and reduces administrative work.

Simplified Expenses for Home Offices

  • Instead of apportioning home expenses, HMRC allows a flat rate deduction based on hours worked at home each month.
  • This method reduces paperwork and ensures compliance.

Common Deductible Business Expenses

A business may incur the following fully deductible expenses:

Office and Administrative Costs

  • Stationery, printing, and office supplies.
  • Business phone and internet bills.

Travel and Transport

  • Fuel, train, taxi, and bus fares.
  • Parking costs (but not fines).
  • Mileage allowance (if using a personal vehicle for business).

Work-Specific Clothing

  • Uniforms or branded workwear.
  • Protective clothing (such as safety boots and gloves).

Stock and Materials

  • Goods bought for resale.
  • Raw materials used in production.

Premises and Utilities

  • Rent, lighting, and heating for business premises.
  • Business insurance.

Marketing and Promotion

  • Advertising costs, including online promotions.
  • Website hosting and design fees.

Final Thoughts: Maximise Deductions and Reduce Tax

Understanding allowable expenses ensures that self-employed individuals only pay the tax they owe—nothing more.

To optimise tax savings:

  • Track all business expenses carefully.
  • Use separate business accounts to avoid confusion.
  • Consider simplified expense options where applicable.
  • Ensure all deductions comply with HMRC’s rules to avoid issues during tax audits.

Need Help Managing Your Business Expenses?

At Merranti Accounting, we specialise in tax efficiency for the self-employed. Contact us today for expert guidance on maximising your allowable deductions and reducing your tax bill.

Related Post