If you're building software in-house, there's a good chance you're leaving money on the table. R&D tax credits can return 18-33% of your development costs—yet many software companies never claim them. This guide covers everything you need to know about R&D tax relief for software businesses in 2026.
What Are R&D Tax Credits?
R&D tax credits are a UK government incentive designed to reward companies for innovation. If you're developing new software, improving existing systems, or solving technical challenges, you can claim back a portion of your costs.
There are two schemes depending on your company size and type:
- SME R&D Relief: For companies with fewer than 500 employees and turnover under €100M. Provides an additional 86% deduction on qualifying costs (total 186% deduction).
- RDEC (R&D Expenditure Credit): For larger companies or SMEs with significant grant funding. Provides a 20% tax credit on qualifying costs.
Does Software Development Qualify?
Not all software work qualifies—but more does than most companies realise. The key test is whether you're seeking an advance in science or technology by overcoming uncertainty.
What Usually Qualifies
- Custom algorithm development: Building new algorithms or significantly improving existing ones
- System architecture challenges: Solving complex scalability, performance, or integration problems
- AI/ML model development: Training and optimising machine learning models
- Novel data processing: Developing new ways to handle, analyse, or visualize data
- Security innovations: Implementing new encryption methods or security architectures
What Doesn't Qualify
- Using existing libraries or frameworks without modification
- Building standard CRUD applications
- Routine bug fixes and maintenance
- Cosmetic UI improvements
- Social science or market research
💡 Key Point: The test isn't whether the work is new to your company—it's whether a competent professional in the field would consider it a technical challenge.
How Much Can You Claim?
For an SME spending £100,000 on qualifying R&D:
- Profitable company: Reduces corporation tax bill by approximately £18,600
- Loss-making company: Can receive a cash payment of approximately £15,500
For a larger company under RDEC spending the same amount, the benefit is approximately £20,000 after corporation tax.
What Costs Qualify?
You can claim for costs directly related to R&D activities:
- Staff costs: Salaries, employer NICs, and pension contributions for developers working on R&D
- Subcontractor costs: Payments to external developers (with restrictions)
- Consumables: Cloud computing costs, software licenses used in R&D
- Software: Development tools and platforms directly used for R&D
The most common claim is for staff costs—particularly developer salaries. If your team spends 30% of their time on qualifying R&D, you can claim 30% of their employment costs.
Recent Changes (2023-2026)
HMRC has tightened the rules significantly in recent years:
- Data and cloud costs: Now qualify under the new 'data and cloud' category (from April 2023)
- Subcontractor rules: More restrictions on claiming for contracted-out R&D
- Advance assurance: New companies can get pre-approval from HMRC to avoid disputes later
- Additional reporting: More detailed technical descriptions now required
The good news? Cloud infrastructure costs (AWS, Azure, etc.) are now explicitly included, which is a significant benefit for SaaS companies.
Common Mistakes to Avoid
Having reviewed dozens of R&D claims, here are the errors I see most often:
- Not claiming at all: The biggest mistake. Many companies assume they don't qualify
- Weak technical descriptions: Your claim needs to explain why the work was technically challenging
- Including routine development: Only claim for genuine R&D, not all development work
- Poor time tracking: Estimates are allowed, but contemporaneous records are better
- Waiting too long: You can claim up to 2 years retrospectively, but earlier is better
How to Claim
R&D tax relief is claimed as part of your Corporation Tax return (CT600). The process:
- Identify qualifying R&D projects and costs
- Calculate the enhanced deduction or tax credit
- Prepare a technical report describing the R&D
- Include the claim in your CT600 and submit to HMRC
- Wait for HMRC review (usually 4-6 weeks)
You can do this yourself, but most companies work with a specialist accountant because the rules are complex and the documentation requirements are strict.
Need help claiming R&D tax credits?
We help software companies identify qualifying work and prepare claims. Fixed fees, no percentage of claim, 30-minute response time guarantee.
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