Tax Deductions for Small Business Owners

Getting your deductions right from day one

Running a small business in the UK means you're responsible for keeping your tax bill fair — not the lowest figure you can dream up, but the one the rules actually allow. The good news is that ordinary spending you already do for work is very often claimable, and those claims add up quickly. A few hundred pounds of overlooked costs can mean real money back in your pocket. The trick is to treat record-keeping as a year-round habit rather than a frantic January scramble.

Everyday costs you can usually claim

If you buy something wholly and exclusively for your business, it's usually a legitimate expense. The ones people most often forget include:

• Office equipment and supplies — laptops, printers, stationery, software subscriptions, and a desk and chair for a dedicated workspace.
• Phone and internet — claim the business share of your bills if one line serves both work and home. A simple log of business calls makes this easy to justify.
• Professional fees — accountancy, bookkeeping software, legal advice and the cost of preparing your tax return.
• Insurance and memberships — business insurance, professional indemnity cover, and subscriptions to trade or professional bodies relevant to what you do.
• Bank and card charges — fees on a business account, plus interest on business borrowing.
• Marketing — website hosting, domain names, printing, advertising and design costs.

What you generally can't claim: client entertaining, personal spending that happens to pass through the business account, and fines or penalties. If in doubt, keep the receipt and check before filing.

Working from home: the practical routes

If you work from home, more of your running costs are claimable than many people realise — but the rules depend on how much of your home the business uses and how you structure the claim. There are three common approaches:

• Simplified expenses — a flat rate based on the hours you work from home each month. For 25 to 50 hours you can claim £10 a month; 51 to 100 hours, £18; 101 hours or more, £26.
• Use of home allowance — a modest weekly rate, currently £6, if you work from home for 25 hours or more a month. It's quick to apply and needs no cost calculations.
• A proportion of actual costs — a sensible business share of heat, light, water, broadband and council tax, worked out on rooms or usage.

One caution: claiming a dedicated space used exclusively for business can affect capital gains relief when you sell your home. If you're dividing up rooms precisely, take advice first.

Travel, vehicles and mileage

Travel for business is claimable, but commuting between home and a regular workplace is not. Journeys to see clients, visit suppliers, attend a trade show or travel between temporary sites normally count.

• Simplified mileage — 45p per mile for the first 10,000 miles in a car or van in the tax year, then 25p a mile after that. Motorcycles run at 24p and bicycles at 20p.
• Actual running costs — the alternative is claiming the business proportion of fuel, servicing, insurance and repairs, which suits some vehicles better.
• Public transport — train, bus and air fares, plus parking and congestion charges, are usually fine. Keep every ticket and booking confirmation.

You can't claim both simplified mileage and actual running costs for the same vehicle. Pick one method and apply it consistently across the year.

Equipment, training and the bigger purchases

Larger items aren't always written off in one go in the way stationery is, but generous allowances mean many small businesses can still claim most of the cost straight away. The Annual Investment Allowance lets you deduct qualifying plant and machinery — tools, equipment, computers and often vans — in the year you buy them. If your business is small, the cash basis may also let you account for income and expenses as they move through the bank, which is far simpler to manage.

Training is more of a mixed bag. Courses that update or maintain skills for your existing trade are usually claimable, while training that qualifies you for a completely new line of work generally isn't. If a course sits somewhere in between, keep the details and ask an accountant before you assume either way.

Keep records, stay relaxed

HMRC expects evidence, so build a system you'll actually maintain. A simple folder — digital or paper — for receipts, invoices, bank statements and mileage logs will save you hours later. Note the date, the amount, what it was for and the business reason behind it.

• Photograph paper receipts as you go; thermal till rolls fade within months.
• Log mileage in your diary the moment you travel, not weeks afterwards.
• Keep records for at least five years after the 31 January filing deadline for the relevant tax year.
• Remember the £1,000 trading allowance — it's a tidy shortcut, but you can't claim it alongside your actual expenses.
• Check the official guidance whenever a cost feels borderline, and speak to a qualified accountant if the sums involved are significant.

Reviewing your expenses monthly rather than annually turns a stressful chore into a ten-minute habit. Do that, and your deductions will be accurate, defensible and quietly working for your business all year round.