In short: Most agencies under-claim, not over-claim. As work has gone remote and software-heavy, the list of legitimate business expenses has quietly grown.
The rule underneath all of this is short: to be deductible, a cost has to be incurred wholly and exclusively for the business. That single phrase decides most arguments. If a cost is genuinely for running the agency, it usually qualifies. If it has a real personal element, it usually does not, or only in part.
It is worth revisiting because the shape of an agency has changed. Teams are remote or hybrid, the stack is almost entirely software, and a lot of delivery is freelance. That has broadened what a normal agency legitimately spends on, and plenty of founders are still claiming like it is 2018.
The usual allowable list for a UK agency: software and SaaS subscriptions, freelancer and subcontractor costs, salaries and employer pension contributions, business travel and accommodation, professional subscriptions and training that maintains your existing skills, accountancy and legal fees, marketing and advertising, and a reasonable proportion of home-working costs where you genuinely work from home.
Equipment is its own category. Laptops, cameras, and similar are usually handled through capital allowances, and the Annual Investment Allowance lets most agencies write off the full cost in the year of purchase rather than spreading it over years. That timing is worth more than people assume.
The grey areas are where confidence gets expensive. Everyday clothing is not allowable even if you only wear it for work. Client entertaining is generally not deductible for tax even when it is a genuine business cost. Anything with mixed personal use needs apportioning honestly. The test is never whether it felt like a business cost. It is whether it was wholly and exclusively one.
Treat this as a prompt. The categories are stable, but the detail and the limits move, and your specific setup changes the answer. The real win is rarely some exotic deduction: it is claiming the ordinary things properly and consistently.
Common questions
The usual allowable list includes software and SaaS subscriptions, freelancer and subcontractor costs, salaries and employer pension contributions, business travel, relevant training, accountancy and legal fees, marketing, and a reasonable share of home-working costs. What qualifies always turns on the wholly and exclusively test.
To be deductible, a cost has to be incurred wholly and exclusively for the business. That single phrase decides most arguments. If a cost is genuinely for running the agency it usually qualifies; if it has a real personal element it usually does not, or only in part after apportioning.
Yes, but through capital allowances rather than as an ordinary expense. The Annual Investment Allowance lets most agencies write off the full cost in the year of purchase rather than spreading it over years, and the timing of that is worth more than many founders assume.
Generally not. Client entertaining is usually not deductible for tax even when it is a genuine business cost, and everyday clothing is not allowable even if you only wear it for work. Anything with mixed personal use needs apportioning honestly against the wholly and exclusively test.
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Simon Jacobs is a Chartered Tax Adviser (CTA · ACA) and ex-PwC, founder of SRJ International. He advises founder-led UK marketing agencies on tax, profit extraction and exit. Read his full profile →