For a software or AI startup, developer salaries and contractor invoices can be some of the largest costs in the business. But their UK tax treatment is not always straightforward.
A £200,000 engineering budget might include costs that are:
- deductible in calculating taxable profits;
- capital in nature;
- potentially eligible for UK R&D tax relief; or
- excluded from an R&D claim because the development work was performed overseas.
These are separate questions, and treating all “developer costs” in the same way can lead to incorrect Corporation Tax calculations and missed R&D relief.
For UK startup founders, the important question is not simply “Can we deduct our developers?” It is:
“What work was performed, how should the expenditure be treated, and does any of it qualify for R&D tax relief?”
Key Takeaways
- The UK does not have a direct equivalent of the US Section 174 five-year and 15-year amortisation rules.
- Software development costs require analysis to determine their appropriate accounting and tax treatment.
- Qualifying R&D must seek an advance in science or technology — developing a new commercial product is not automatically qualifying R&D.
- For accounting periods beginning on or after 1 April 2024, the main UK regimes are the merged R&D Expenditure Credit (RDEC) and Enhanced R&D Intensive Support (ERIS).
- Contractor and externally provided worker costs can qualify, but specific conditions apply.
- R&D performed outside the UK is now significantly restricted for relief purposes.
- Paying an overseas engineering team because it is cheaper or easier to hire abroad does not, by itself, satisfy the overseas R&D exception.
How Are Software Development Costs Treated in the UK?
Unlike the US Section 174 regime, UK tax law does not impose one universal amortisation period on startup software-development expenditure. Instead, the treatment depends on the nature of the expenditure and the relevant accounting and tax rules.
Revenue expenditure
Potentially deductible in calculating trading profits.
Capital expenditure
Potentially resulting in an asset on the balance sheet and a different pattern of tax relief.
Accounting treatment is relevant, but it does not automatically determine the tax treatment.
That is why software development costs should be reviewed based on what the company is actually building and why the expenditure was incurred.
Accounting Treatment and Tax Treatment Are Different Questions
Your accountant may determine that certain development expenditure should be capitalised as an intangible asset in the company's financial statements. That does not necessarily answer the Corporation Tax question.
Similarly, the fact that expenditure qualifies as R&D for tax purposes does not necessarily mean it receives the same accounting treatment as every other R&D-related cost. In practice, startup finance teams need to consider at least three separate questions:
- How should the expenditure be recorded in the accounts?
- How is it treated when calculating taxable profits?
- Does it qualify for R&D tax relief?
Those answers can be different.
What Counts as R&D for UK Tax Purposes?
Not every software development project qualifies for R&D tax relief. For UK tax purposes, the project must seek an advance in a field of science or technology.
Software development can fall within the relevant fields of science or technology. But simply writing code, building an app or launching a SaaS product does not automatically make the project qualifying R&D. A qualifying project generally needs to involve technological or scientific uncertainty that cannot readily be resolved by a competent professional in the field.
Likely ordinary development
Building a standard customer dashboard using established technology.
May contain qualifying R&D
Attempting to overcome a genuine technological limitation in distributed data processing where the solution is not readily deducible by a competent professional.
The outcome depends on the facts.
Which Startup Costs Can Qualify?
The current R&D regimes contain defined categories of qualifying expenditure. Depending on the circumstances, these can include:
| Cost | Potential R&D treatment |
|---|---|
| Employee costs for qualifying R&D | May qualify |
| Externally provided workers | May qualify, subject to conditions |
| R&D contractors | May qualify, subject to contracting and location rules |
| Software used for R&D | May qualify |
| Cloud computing used for qualifying R&D | May qualify |
| Data licences used for qualifying R&D | May qualify |
| Consumables used in R&D | May qualify |
| Routine bookkeeping | Generally not qualifying R&D |
| Sales and marketing | Generally not qualifying R&D |
| Routine customer support | Generally not qualifying R&D |
| Commercial product design without technological advance | Not automatically qualifying |
Only the proportion attributable to qualifying R&D should be included. For example, if a software licence is used partly for R&D and partly for ordinary commercial activity, an appropriate allocation may be required.
What About Developer Salaries?
Developer salaries can form part of qualifying R&D expenditure when employees spend time on qualifying R&D activities. That does not necessarily mean 100% of a developer's salary qualifies. Suppose a developer spends approximately:
50%
Solving qualifying technological uncertainties
30%
Developing routine product features
20%
Maintenance and support
The company should not automatically treat the entire salary as qualifying R&D expenditure — the qualifying amount needs to reflect the relevant R&D activities. This makes good project and time documentation particularly important.
What About Contractors?
The rules for contracted-out R&D changed substantially for accounting periods beginning on or after 1 April 2024. A company can now potentially claim qualifying expenditure where it contracts out its own R&D, provided it can demonstrate that it:
- made the decision to undertake the R&D; and
- planned or intended the relevant R&D.
For an unconnected contractor, the qualifying amount is generally based on 65% of the relevant contractor payment, subject to the other conditions. Different rules can apply where the contractor and company are connected.
Overseas Developers: A Major Issue for UK Startups
For accounting periods beginning on or after 1 April 2024, the current R&D regimes restrict relief for certain contractor and externally provided worker expenditure where the R&D takes place outside the UK. As a general rule, contracted R&D performed overseas is excluded unless a specific exception applies.
A UK startup using developers in countries such as Poland, Ukraine, Portugal, India or the United States should not automatically assume those contractor costs can be included in its UK R&D claim.
When can overseas R&D still qualify?
There is an exception where conditions necessary for the R&D:
- are not present in the UK;
- are present in the overseas location; and
- would be wholly unreasonable for the company to replicate in the UK.
Potential examples involve particular geographical, environmental or social conditions, facilities, or legal and regulatory requirements. But there are two important exclusions:
Lower cost is not enough.
“We use developers there because equivalent engineers cost less.”
Worker availability is not enough.
“We could not find enough developers in the UK.”
Those reasons do not, by themselves, satisfy the statutory exception.
Example: UK AI Startup With an Overseas Engineering Team
Consider a UK AI startup that incurs:
| Cost | Amount | R&D analysis |
|---|---|---|
| UK employee costs | £150,000 | The proportion attributable to qualifying R&D may form part of the claim. |
| Marketing and sales | £80,000 | Not qualifying R&D merely because the product is innovative. |
| Overseas development contractor | £250,000 | If performed outside the UK and no exception applies, may be excluded. |
| Cloud computing and data | £30,000 | Can potentially be included where conditions are met and costs relate to qualifying R&D. |
Assume part of the technical project constitutes qualifying R&D. The company should not simply add every technical cost together and claim relief on £430,000. The result may be very different from applying an R&D percentage to the entire engineering budget.
The Current UK R&D Tax Relief Regimes
For accounting periods beginning on or after 1 April 2024, the previous SME R&D relief and old RDEC regimes have been replaced for new periods. There are now two principal routes.
Merged RDEC
20%
Headline expenditure credit for non-ring-fence trades. An above-the-line taxable credit, so the headline rate is not the net cash benefit.
ERIS
SMEs
Enhanced support for qualifying loss-making R&D-intensive SMEs, with different eligibility and calculation rules.
A company cannot claim both ERIS and the merged RDEC scheme on the same expenditure, so establish which regime applies before forecasting the value of a claim.
R&D Relief Is Not the Same as Deducting an Expense
Suppose a startup spends £100,000 on qualifying development. There are separate questions around:
Accounting treatment
How should the expenditure appear in the financial statements?
Corporation Tax treatment
What deduction is available when calculating taxable profits?
R&D relief
Does qualifying expenditure generate an additional R&D tax benefit under RDEC or ERIS?
Founders should avoid thinking of an R&D claim simply as “deducting our developers”. The tax mechanics are more nuanced.
Why Documentation Matters
A strong R&D claim should be supported by evidence showing what the company was trying to achieve and why the work qualified. For software and AI startups, useful documentation may include:
- technical project descriptions;
- technological uncertainties identified;
- technical design documents;
- engineering tickets and development records;
- project timelines and staff responsibilities;
- reasonable allocations of employee time;
- contractor agreements and invoices;
- evidence of where contracted R&D was performed; and
- calculations supporting the qualifying expenditure.
Documentation is particularly important where the startup uses a mixture of UK employees, overseas contractors and cloud infrastructure.
Common Mistakes Startup Founders Make
Assuming all software development is R&D
Creating new software commercially does not automatically mean the work qualifies for R&D tax relief.
Claiming 100% of engineering payroll
Developers often spend time on routine development, maintenance and other activities outside qualifying R&D.
Ignoring where contractors perform the work
Under the post-April 2024 rules, the location of contracted R&D can directly affect eligibility.
Assuming cheaper overseas developers satisfy the exception
Cost and worker availability are specifically excluded when applying the overseas exception.
Treating bookkeeping and R&D calculations separately
The R&D claim ultimately needs to reconcile with the company's underlying accounting records.
Waiting until year-end to identify R&D
Reconstructing technical projects, developer time and contractor activity months later makes the claim much harder to support.
Practical Recommendations for UK Founders
Separate R&D projects from routine development
Create clear internal project categories for genuine technical R&D rather than putting every engineering cost into one bucket.
Track employee activity
You do not necessarily need complex time sheets, but you should have a reasonable and supportable methodology for allocating staff costs.
Record contractor location
Know not only where your contractor company is incorporated, but where the relevant R&D activity is actually performed.
Review development contracts
Contracts should make clear what the company is commissioning and, where relevant, whether R&D is contemplated.
Separate cloud and software costs
Maintain enough detail to identify services used directly for qualifying R&D.
Review capitalisation annually
Review significant development expenditure before finalising annual accounts and the Corporation Tax computation.
Model R&D relief conservatively
Do not build runway forecasts on the assumption that the entire engineering budget will qualify.
How Agbis Helps
Startup Accounting and R&D Readiness Review
We help UK startups organise their finance function so development expenditure, Corporation Tax and potential R&D claims can be assessed from reliable records. We can review:
- Developer and contractor costs
- R&D expense categorisation
- UK vs overseas development expenditure
- Software development cost treatment
- Cloud and data costs
- Corporation Tax readiness
- R&D claim readiness
- Management reporting and runway
Frequently Asked Questions
Are software developer salaries tax-deductible in the UK?+
They can be, but the answer depends on the nature of the expenditure and applicable tax rules. The accounting treatment and tax treatment also need to be considered separately. If the development activities constitute qualifying R&D, relevant employee costs may additionally form part of an R&D relief claim.
Does all software development qualify for R&D tax relief?+
No. The project must meet the UK definition of R&D for tax purposes, including seeking an advance in science or technology and addressing relevant scientific or technological uncertainty. Simply creating a new app, website, feature or SaaS product does not automatically qualify.
Can an AI startup claim R&D tax relief?+
Potentially. AI development can involve qualifying technological advances and uncertainties, but describing a product as “AI” is not sufficient by itself. Eligibility depends on the technical work undertaken.
Can UK startups claim R&D relief for overseas developers?+
The current rules significantly restrict claims for contracted R&D and externally provided workers where the relevant activity occurs overseas. Limited exceptions exist where necessary conditions for the R&D are unavailable in the UK and it would be wholly unreasonable to replicate them here. Cost savings and availability of workers do not by themselves qualify for the exception.
Can cloud computing costs qualify for R&D relief?+
Potentially, yes. For relevant periods, qualifying expenditure can include data licence and cloud computing costs used for qualifying R&D activities, subject to the applicable rules.
What is the current R&D tax credit rate?+
Under the merged RDEC scheme, the headline credit rate for non-ring-fence trades is 20% of qualifying expenditure. However, RDEC is taxable and several rules can affect the amount ultimately received, so 20% should not be interpreted as the company's net cash benefit. Separate enhanced rules apply to qualifying loss-making R&D-intensive SMEs under ERIS.
Should startups identify R&D only when preparing the tax return?+
Ideally, no. Tracking qualifying projects, technical uncertainties, staff involvement and contractor activity during the year usually produces much stronger records than attempting to reconstruct everything after year-end.
Conclusion
For UK startups, developer costs do not fall under a single rule equivalent to US Section 174. Founders need to understand several connected questions: is the expenditure revenue or capital, how should it be reflected in the accounts, does the project constitute R&D for UK tax purposes, which costs are eligible for relief, and where was the work actually performed? Good bookkeeping alone cannot determine whether a project qualifies as R&D — but good financial records make it much easier to identify the relevant expenditure, support the calculation and prepare a defensible claim. The best time to establish that process is while the R&D is happening, not when the Corporation Tax return is due.
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Disclaimer: This article is for informational purposes only and does not constitute tax, legal or accounting advice. R&D relief rules are complex and depend on individual facts. Please consult a qualified UK accountant or tax adviser about your specific circumstances.