United Kingdom Savings Calculator — How Much Could You Save?

Commonly Missed Deductions

• Home office expenses: Claim £6/week simplified allowance (no receipts needed), or the actual business proportion of home running costs such as heating, electricity, and broadband.
• Business mileage: 45p per mile for the first 10,000 miles per year, then 25p per mile thereafter. Many self-employed people forget to log every business journey.
• Professional subscriptions & training: Costs of relevant professional memberships, trade journals, online courses, and books directly related to your work are fully deductible.
• Phone & internet: The business proportion of your phone and broadband bills can be claimed. If you use your phone 60% for business, you can deduct 60% of the cost.
• Equipment & tools: Items bought exclusively for business use, including computers, cameras, and tools, qualify for the Annual Investment Allowance (AIA) — 100% deduction in the year of purchase.
• Bank charges & professional fees: Business bank account fees, accounting software subscriptions, and fees paid to accountants or bookkeepers are all allowable expenses.

How AI Categorisation Saves You Money

• Industry average missed deductions: Research suggests self-employed individuals miss 15–20% of their allowable expenses on average, often due to poor record-keeping or uncertainty about what qualifies.
• The true cost of missed deductions: Every £1 of unclaimed expenses increases your taxable profit — and therefore your tax bill. At the basic rate that means 29p lost (20% Income Tax + 9% Class 4 NIC) for every pound not claimed.
• Higher earners pay even more: If your profits exceed £50,270, the marginal rate on unclaimed deductions rises to 42% (40% IT + 2% Class 4 NIC). Accurate categorisation becomes even more valuable.
• AI-powered accuracy: AnyDayAnyTax uses two independent AI engines to extract and categorise every transaction from your bank statements, flagging potential deductions you might otherwise overlook.

Worked Example: Missed Deductions — UK Freelancer Earning £50,000

1. Annual income: £50,000 with £12,000 in identified business expenses
2. Industry average missed deductions: 17% of £12,000 = £2,040 in unclaimed expenses
3. Common missed items: £312 home office simplified allowance (£6/week × 52), £780 business mileage (1,733 miles × 45p), £600 professional subscriptions, £348 phone business use (60% of £580)
4. Tax impact at basic rate (29%): £2,040 × 29% (20% IT + 9% NIC) = £591.60 overpaid per year
5. Tax impact at higher rate (42%): If profits exceed £50,270, the same £2,040 costs £856.80 extra (40% IT + 2% NIC)
6. Monthly cost of missed deductions: £591.60 ÷ 12 = £49.30/month lost at basic rate
7. 5-year cumulative cost: £591.60 × 5 = £2,958 in unnecessary tax over a typical HMRC record-keeping period

A UK freelancer earning £50,000 who misses just 17% of allowable expenses overpays HMRC by approximately £592 every year — or nearly £3,000 over five years. The most commonly overlooked deductions are the £6/week home office allowance, business mileage at 45p/mile, and the business proportion of phone and broadband costs. AI-powered categorisation catches these automatically from your bank statements.

Frequently Asked Questions

What expenses can UK self-employed people claim?

HMRC allows a wide range of allowable expenses including: cost of goods sold, business travel and mileage, office costs (rent, utilities, software), repairs and maintenance, professional fees (accountants, solicitors), bank charges, advertising and marketing, and other business-related costs. The key rule is that expenses must be ‘wholly and exclusively’ for business purposes. Some expenses are split between personal and business use — only the business proportion is deductible.

How much could better expense categorisation save me?

It depends on your income and tax band. For example: if you earn £50,000 and typically miss 17% of allowable expenses, that’s approximately £8,500 in unclaimed deductions. At the basic rate (20% IT + 9% NIC = 29%), that’s around £2,465 in unnecessary tax paid. At the higher rate (40% IT + 2% NIC = 42%), the same missed deductions would cost £3,570. Consistent, AI-assisted categorisation directly reduces what you owe.

Do I need receipts for every business expense?

HMRC requires you to keep records of all income and expenses for at least 5 years after the Self Assessment deadline. However, simplified expenses (flat-rate mileage and home office allowances) do not require receipts. For other expenses, digital records — photos of receipts stored in apps like AnyDayAnyTax — are fully accepted by HMRC. Good record-keeping is the foundation of a clean tax return.

How does AnyDayAnyTax compare to an accountant?

AnyDayAnyTax is a tax preparation and planning tool, not a filing service — it helps you organise and categorise your transactions so your records are accurate and complete before you file. A UK accountant typically charges £300–£500/year for sole trader accounts. AnyDayAnyTax Pro gives you a clear picture of your finances throughout the year, an AI Tax Assistant to answer your questions, and makes it easier (and cheaper) to work with an accountant if you choose to use one. See our pricing page for current rates.

When is the Self Assessment deadline?

The key UK tax deadlines are: 5 April — end of the tax year; 31 July — second Payment on Account due; 5 October — register for Self Assessment if you’re new; 31 October — paper tax return deadline; 31 January — online tax return deadline and first Payment on Account due. Missing the January deadline incurs a £100 automatic penalty, with further charges if filing is more than 3 months late.