How to fund custom software development

Custom software is funded through three levers, often combined: your own cash or a loan, public support (R&D tax credits and innovation grants, depending on your country), and the purchase model itself, since a subscription spares you the upfront cost of development. Tax credits reimburse part of the spending after the fact and under strict conditions: they do not fund the start of a project.

This guide gives the general picture for companies in the UK, the US and the EU, as of October 2026. Tax rules change every year and depend on your situation, so treat it as orientation, not advice: have any funding plan checked by your accountant or a specialist adviser before relying on it.

The levers at a glance

R&D tax credits: generous, but for research

Most countries reward research and development through the tax system. The common trap is assuming that building software is, by itself, R&D. It usually is not.

United Kingdom. HMRC's guidance on R&D relief states that a project must seek an advance in science or technology, and only companies liable to UK Corporation Tax can claim. For accounting periods beginning on or after 1 April 2024, two schemes replaced the old ones, according to HMRC's R&D tax credits statistics of September 2026: the merged R&D expenditure credit, at a rate of 20%, and enhanced R&D intensive support (ERIS), which lets loss-making, R&D-intensive SMEs deduct an extra 86% of their qualifying costs.

United States. The credit for increasing research activities (section 41) is claimed on Form 6765. Its official instructions set a four-part test: the work must be technological in nature, aimed at a new or improved business component, and substantially all of it must be part of a process of experimentation. Software developed primarily for your own internal use faces an extra hurdle, the high threshold of innovation test: it must be innovative, involve significant economic risk from technical uncertainty, and not be commercially available for your purpose without modification.

Elsewhere in Europe. Each country has its own regime. France, for example, has an innovation tax credit for SMEs covering the design of prototypes of new products, alongside its research tax credit.

What this means in practice: an internal application built with well-understood technology (forms, dashboards, integrations) rarely qualifies anywhere. A project that faces a real technical unknown, such as an algorithm nobody knows will reach the required performance, may qualify, provided you document hypotheses, trials and results as you go. Records rebuilt after the fact rarely survive a review.

Innovation grants

Public agencies fund innovative projects through competitive calls. Innovate UK does this in the United Kingdom, and the EIC Accelerator of the European Innovation Council does it at EU level for startups and SMEs. National and regional agencies across Europe run similar programmes.

Three points apply to all of them:

• They take time. You write an application, wait for an assessment and, if successful, report on how the money was spent. A project that must start next month cannot wait for a decision.
• They fund innovation, not digitisation. Replacing a spreadsheet with an internal app may transform your operations, but it is rarely innovative in the sense these programmes mean.
• They interact with tax credits. Many regimes reduce the tax credit when the same work was paid for by a grant. Have the combination calculated before assuming you get both in full.

The purchase model: pay for use, not for delivery

The simplest lever is not public money: it is how you pay. With a fixed price, you fund development release by release, then maintenance. With a subscription, the vendor builds the application and you pay a monthly fee that includes hosting, maintenance and improvements. The cost becomes a regular operating expense, with no upfront investment.

The trade-off is contractual: under this model the vendor usually remains the publisher of the software. Check the commitment period, what happens when the subscription ends and how your data comes back to you. The three-year comparison is in subscription or upfront build, and the ownership question in who owns the source code of custom software.

Shrink the amount you need to fund

Before looking for money, reduce the need. Three proven ways:

1. Start small. A first version that covers the core of the need costs less and pays back sooner. Our guide to what to build first in an MVP shows how to cut scope without losing what matters.
2. Validate before committing. A prototype shows what you are about to pay for, and stops you funding features nobody will use.
3. Compare like with like. Two quotes covering different scopes cannot be compared; our method to compare software development quotes avoids that mistake.

For a SaaS product, running costs (hosting, payments, support) weigh as much as the build: see how much it costs to build a SaaS platform.

The most common funding mistakes

• Booking a tax credit as project income. It arrives after the spending, sometimes much later, and the claim can be reviewed. Your cash flow has to carry the project without it.
• Choosing a vendor because of a subsidy. Public money does not make up for the wrong vendor or the wrong scope.
• Forgetting what comes after launch. Hosting, maintenance and improvements cost money every year; a funding plan that stops at go-live is incomplete.
• Not keeping records. Every R&D regime expects you to justify the work and the spending. Start documenting on day one.

Where to start

Put a figure on the need first, then look for the funding that fits it. LPR Studio offers three models, including a subscription that removes the upfront development cost; they are described on our offers page. The visual prototype is free and presented in a video call within 5 working days, wherever you are. It gives you a concrete scope to take to your accountant before you choose between cash, public support and a subscription.