You have a legal obligation to pay the right amount of tax — but not a penny more. Here are practical ways to keep your tax bill to a minimum.
Tax-Saving Strategies by Business Type
Sole Traders
| Strategy | Detail | Potential saving |
|---|---|---|
| Claim all allowable expenses | Many sole traders miss legitimate deductions | Varies — could be £1,000s |
| Working from home | £6/week (simplified) or actual proportion of costs | £312/year (simplified) or more |
| Mileage allowance | 45p/mile (first 10,000) then 25p/mile | Depends on mileage |
| Capital allowances | Deduct cost of equipment from profits | Full cost of qualifying items |
| Pension contributions | Tax relief at your marginal rate | Up to 45% tax relief |
| Use your partner | If your spouse does genuine work, pay them (uses their tax-free allowance) | Up to £12,570 tax-free |
| Trading allowance | First £1,000 of trading income is tax-free | £1,000 |
| Losses | Carry forward/back losses to offset against other income | Reduces tax in profit years |
Limited Company Directors
| Strategy | Detail | Potential saving |
|---|---|---|
| Optimal salary/dividend split | Pay salary just below NI threshold (~£12,570), rest as dividends | £2,000–£10,000+/year |
| Employer pension contributions | Company contributes to your pension — corporation tax deductible, no NI | Up to £60,000/year |
| Company expenses | Claim all legitimate business expenses through the company | Varies |
| Capital allowances / AIA | Deduct equipment costs — Annual Investment Allowance up to £1 million | Full cost deduction |
| R&D tax credits | If your company does innovative work | 15–27% of qualifying spend |
| Salary sacrifice | Sacrifice salary for pension, EV, cycle-to-work, ultra-low emission car | NI savings for you and the company |
| Trivial benefits | Gifts to employees/directors under £50 each (max £300/year for directors) | Up to £300 tax-free |
| Shareholder spouse | If your spouse is a genuine shareholder, dividends use their allowances | Up to £2,000 dividend allowance each |
Allowable Expenses Checklist
Sole Traders and Partnerships
| Expense | Allowable? | Notes |
|---|---|---|
| Office supplies, stationery | Yes | |
| Business phone calls/contract | Yes | Business proportion only (if mixed use) |
| Internet | Yes | Business proportion |
| Postage | Yes | |
| Advertising and marketing | Yes | Including website costs, social media ads |
| Accountancy fees | Yes | |
| Legal fees (business-related) | Yes | |
| Professional subscriptions | Yes | Must be on HMRC’s approved list or directly relevant |
| Insurance (business) | Yes | Public liability, PI, etc. |
| Business travel | Yes | Mileage, public transport, hotels for business trips |
| Business meals (with clients/customers) | Yes | Must be genuinely for business entertainment |
| Working from home | Yes | £6/week simplified or actual costs |
| Training (related to current business) | Yes | Must improve existing skills, NOT learn a new trade |
| Stock and materials | Yes | |
| Uniforms/protective clothing | Yes | Only if specific to the job (not everyday clothes) |
| Equipment under £1,000 | Yes | Claim in full (or use capital allowances) |
| Bank charges and interest | Yes | Business accounts only |
| Bad debts | Yes | If you’ve written off an invoice you can’t collect |
| Software subscriptions | Yes | Business software |
Limited Companies (Additional)
| Expense | Allowable? | Notes |
|---|---|---|
| Director salary | Yes | Corporation tax deductible |
| Employer pension contributions | Yes | Corporation tax deductible, no NI |
| Employer NI | Yes | Deductible |
| Staff costs | Yes | |
| Business entertainment | No | Not allowable for CT (but no BIK if under £150/head for annual events) |
| Trivial benefits for directors | Yes | Under £50 each, max £300/year |
| Company car (electric/hybrid) | Yes | Very low BIK rates for EVs |
Working From Home
Sole Traders
| Method | How it works | Best for |
|---|---|---|
| Simplified expenses | Flat rate: 25–67 hrs/month = £10/month, 51–100 hrs = £18/month, 101+ hrs = £26/month | Simple, low costs |
| Actual costs | Calculate proportion of home bills used for business | Higher actual costs |
Limited Company Directors
| Method | How it works | Amount |
|---|---|---|
| Employer pays | Company pays you £6/week (£26/month) for use of home as office — no evidence needed | £312/year tax-free |
| Actual costs | Company reimburses actual additional costs (must be evidenced) | Varies |
| Rent a room | Company pays a market-rate rent for use of a room — but CGT implications on property sale | Consider carefully |
Vehicle Expenses
Sole Traders — Mileage vs Actual Costs
| Method | Detail | Best for |
|---|---|---|
| Mileage allowance | 45p/mile (first 10,000) then 25p/mile | Low-mileage or low-cost vehicles |
| Actual costs | Claim proportion of fuel, insurance, servicing, depreciation | High-mileage or expensive vehicles |
Important: Once you choose a method, you must stick with it for that vehicle.
Limited Company — Company Car vs Personal Car
| Option | Tax treatment |
|---|---|
| Company car | Benefit-in-kind tax based on CO₂ emissions. Electric = 2% BIK, Petrol = 20–37% |
| Personal car, claim mileage | Company reimburses at HMRC advisory rates — tax-free |
| Personal car, claim 45p/mile | Company pays 45p/mile as employee — same as sole trader rates |
Pension Contributions
| Scenario | Tax benefit |
|---|---|
| Sole trader | Contributions reduce taxable income — relief at 20/40/45% |
| Ltd company — employer contribution | Corporation tax deductible (25% relief) AND no employee NI |
| Ltd company — salary sacrifice | Saves both employer NI (13.8%) and employee NI |
| Annual allowance | £60,000 (or 100% of earnings if lower) |
| Carry forward | Use unused annual allowance from the previous 3 years |
Capital Allowances
| Type | What it covers | Allowance |
|---|---|---|
| Annual Investment Allowance (AIA) | Plant and machinery | 100% deduction up to £1 million/year |
| Full expensing (companies only) | Plant and machinery | 100% for main rate items, 50% for special rate |
| Writing down allowance | Items not covered by AIA | 18% (main pool) or 6% (special rate) per year |
| Small pools | Pools under £1,000 | Write off in full |
Common Tax Mistakes
| Mistake | Cost |
|---|---|
| Not claiming all allowable expenses | Overpaying tax |
| Not keeping receipts | Can’t substantiate claims if HMRC enquires |
| Missing the Self Assessment deadline | £100 fine + interest |
| Not registering for VAT when required | Penalties and back-dated VAT owed |
| Taking too high a salary from a Ltd company | Unnecessary NI charges |
| Not paying into a pension | Missing significant tax relief |
| Not claiming mileage | Free money left on the table |
| Mixing personal and business finances | Record-keeping nightmare, risk of incorrect claims |