How to reduce corporation tax in the UK, and the option most lists leave out

Search for this and you will find the same list, written six ways. Claim your allowable expenses. Pay into a pension. Claim R&D relief. Buy equipment before year end. Pay yourself in dividends rather than salary. Carry a loss back.

The list is not wrong. It is just small. For a company making £200,000 of profit, working through all six carefully might move the effective rate by two or three points. That is real money and worth having. It is also not the conversation a founder actually wants to have when the corporation tax bill arrives and it is larger than the last funding round they raised.

There is a second conversation, and almost nobody writing these lists has it, because it does not apply to most businesses. It applies to yours only if a meaningful part of your profit comes from software, algorithms or tooling your own company paid to develop. If that describes you, the question is not which reliefs to claim against UK profit. It is whether the profit should be earned in the UK at all.

This piece covers both. The ordinary reliefs first, honestly, including what each is worth. Then the structural option, including the conditions that make it work and the ones that make it fail.

What the UK rate actually is

The UK main rate of corporation tax is 25% on profits above £250,000. At or below £50,000 the small profits rate is 19%, and between those two figures Marginal Relief tapers the effective rate upward from 19% toward 25%. Most companies reading this are paying somewhere between 19% and 25%, and the ones with a genuine tax problem are paying 25% on the whole of it.

That is the number every relief below is chipping at.

The ordinary reliefs, and what each is worth

Allowable expenses

Every cost incurred wholly and exclusively for the trade reduces taxable profit. Salaries, software subscriptions, professional fees, travel that is genuinely business travel. This is not a strategy, it is bookkeeping, and if your accounts are in order you are already claiming it.

The only thing worth saying here is that founders routinely under-claim on costs they personally absorbed early on and never put through the company. Worth an afternoon with your bookkeeper once. Not worth an ongoing plan.

Employer pension contributions

An employer contribution to a director's pension is an allowable expense, and unlike salary it carries no National Insurance. For an owner-managed company this is usually the single most efficient way to move money out of the company without paying tax twice on it.

The constraint is that the money is in a pension. If you are forty and building towards an exit, locking profit away until you are fifty-seven is a real cost, not a free saving. Plenty of founders take this trade. Plenty should not.

R&D tax relief

If your company is resolving genuine technical uncertainty, R&D relief is generous and you should be claiming it. Software companies frequently qualify and frequently do not realise it.

Two warnings. First, the scheme has tightened considerably, enquiry rates have risen, and the market filled up with advisers who took a percentage of a claim they had no intention of defending. A claim that cannot be defended is a liability with a delay on it. Second, R&D relief reduces the tax on profit you have already earned in the UK. It does not change where the profit arises. Hold that thought.

Capital allowances

Plant, machinery and qualifying equipment attract allowances, and the annual investment allowance lets most companies write off qualifying spend in the year they incur it. This matters enormously if you buy things. If your company's main assets are people and code, it does very little, because your costs are already deducted as salary.

Salary versus dividends

An old favourite, and mostly a personal tax question rather than a corporation tax one. Salary is deductible for the company and taxed on the individual; dividends are paid from post-tax profit. Getting the mix right is worth doing and worth a conversation with your accountant. It does not reduce corporation tax so much as decide who pays what afterwards.

Loss relief and timing

Losses can be carried back, carried forward and in some cases surrendered within a group. Timing income and expenditure across a year end can matter at the margin. Useful, situational, and not a plan.

Add it up

Work through every item above properly and a profitable software business typically moves its effective rate by a small number of points. Pension contributions can do more, at the cost of liquidity. R&D relief can do more again, if you genuinely qualify and can defend it.

None of it changes the underlying position, which is that your company earns its profit in the UK and pays the UK rate on it. Every relief on that list is a deduction against a number that was always going to be taxed at 25%.

The question the lists do not ask

Here is the thing that separates a software business from a consultancy or a retailer. A meaningful share of your profit is not really produced by your office, your customers' location, or where your invoices are raised. It is produced by something your company built and owns: a platform, an engine, a model, a set of algorithms, proprietary tooling. That thing is an asset, it is mobile in a way a shopfront is not, and where it sits determines where the profit it generates is earned.

Several EU jurisdictions tax profit from qualifying intellectual property at a reduced rate, under a framework the OECD designed. This is not a loophole somebody found. It is an incentive regime, published in statute, built on an agreed international standard, and the UK has its own version of it.

The UK's own version, and why it usually does not help

The UK operates a Patent Box, which taxes qualifying profit from patented inventions at an effective 10% rather than the main rate. If you hold granted patents and earn profit attributable to them, it is worth serious attention.

The problem for most software companies is in the name. The relief attaches to patents. Software is generally protected by copyright rather than patents, and most SaaS businesses have never filed one, because filing patents is expensive, slow, and largely beside the point when your advantage is shipping speed rather than a defensible invention.

So a founder reads about the Patent Box, works out that a 10% rate would transform the business, and then discovers the regime was not built for the way software companies actually protect what they make.

The Cyprus IP Box, and what it does differently

Cyprus operates an IP Box that covers copyrighted software, not only patents. The mechanism is a deduction: 80% of qualifying profit from qualifying intellectual property is deducted, and the remaining 20% is taxed at the Cyprus corporate rate of 15%. That produces an effective rate of approximately 3% on the qualifying share.

The statutory basis is Article 9(1)(l) of the Cyprus Income Tax Law, which the 2026 reform left unchanged, and the 15% corporate rate comes from Law 207(I)/2025, gazetted on 31 December 2025 and in force for periods beginning on or after 1 January 2026.

On £1m of qualifying IP profit, the difference against a 25% UK rate is not a couple of points. It is most of the bill.

The conditions, stated plainly

This is where the honest version of the article diverges from the promotional one. Approximately 3% is a floor rather than a promise, and four things decide whether you get near it.

The IP has to be the right kind. Copyrighted software can qualify: platform code, engines, trading bridges, algorithms, models, proprietary tooling. Brands, trademarks and other marketing intangibles are excluded, permanently and by design. If what makes your business valuable is a brand rather than a codebase, this regime is not for you.

The profit has to trace to the IP. Qualifying income includes licence and royalty income, and qualifying income embedded in the products and services you sell, which is what makes the regime workable for SaaS. It does not extend to every pound the company earns.

The nexus rule decides how much qualifies. The regime is built on the OECD modified nexus approach, which ties the benefit to the R&D expenditure behind the asset and who incurred it. Development the Cyprus company funds itself, or outsources to unrelated third parties, counts toward the qualifying share. Buying in existing IP does not, and development recharged from group companies outside Cyprus does not. A smaller qualifying share moves the effective rate up, never down.

The company has to be real. The Cyprus company must genuinely develop and control the asset, which in practice means a resident technical lead, a core engineering team approving releases locally, board control on the island, and intra-group pricing set at arm's length. Ownership on paper is not enough, and a company registered in a country it does not operate in is a familiar refusal at any bank.

The part nobody mentions until later

Two things tend to surprise people who look at this seriously.

The first is banking. A tax position that a bank will not support is not worth having. Accounts are refused for the same handful of reasons every time: an ownership chain running through an offshore jurisdiction, a source of funds that cannot be evidenced, or no operating substance in the country of registration. Registering a company is administrative. Getting an account opened for it is not, and the sequence matters: the banking question should be answered before you incorporate rather than after.

The second is that the rate on the company is not the rate on you. Cyprus charges no withholding tax on dividends to non-resident shareholders, but your own country of residence may tax the same dividend when you receive it. That is the first thing a competent adviser will test, and it is why the honest framing of this regime is what stays in the business rather than what you personally take home.

So which conversation are you having?

If your profit comes from trading, services, property or retail, work the list at the top of this article with a good accountant. It is the right list, the reliefs are real, and there is no structural answer hiding behind them.

If a meaningful share of your profit comes from software your company paid to develop, the list is still worth working, but it is the smaller of the two conversations. The larger one is whether the asset generating that profit should sit where it currently sits, and that question is answered by arithmetic: the qualifying share of your profit, the cost of building genuine substance, and what remains.

That arithmetic either works on your facts or it does not. It is worth an hour to find out which, and a regulated Cyprus tax advisor puts the answer in a formal opinion before anyone commits to anything.

Nothing here is advice on your facts. It is the shape of the decision, which is the part most articles on reducing corporation tax leave out entirely.