Using a Business Loan to Bridge R&D Tax Credit Cashflow

The cashflow problem with R&D credits

R&D tax relief — whether under the legacy SME scheme, the Research and Development Expenditure Credit (RDEC), or the merged scheme introduced from April 2024 — results in either a reduction of your corporation tax liability or a payable cash credit from HMRC. Either way, you cannot access this value until your tax return is submitted and processed, which can take several months after your accounting year-end.

For companies with significant ongoing R&D spend, this creates a predictable cashflow gap: you incur costs throughout the year, but the relief arrives long after. A bridging loan sized against the expected credit can fill that gap, funding salaries, materials, and overheads while the claim works through the system.

Sizing and structuring the bridge

The appropriate loan size depends on your accountant's or R&D specialist's estimate of the credit due. It is sensible to draw conservatively — credits can be lower than initially projected if HMRC enquires into the claim or disallows certain costs. Borrowing against an optimistic estimate and receiving a lower credit could leave you with a residual debt to refinance.

Term should be short: if your year-end is December and you expect to file by the following March, with HMRC paying within three to six months of filing, a nine-to-twelve-month facility typically covers the cycle. Some companies use a revolving credit facility so they can draw and repay in line with R&D cashflows across multiple years.

Tax treatment of the bridging loan

The interest on a loan used to fund R&D expenditure is deductible under the Loan Relationships rules in the same way as any other business borrowing. The deduction applies to the interest paid, not to the principal. The R&D tax credit itself is taxable income under RDEC (it is brought into account as a credit against your tax liability or as taxable income if payable), but the loan proceeds are not income.

There is no interaction between the R&D relief calculation and the interest deduction — they are computed independently. Your accountant should review both in the context of your overall tax position to confirm the net benefit. These observations are general; confirm the specifics for your company with a qualified adviser.

HMRC scrutiny of R&D claims

HMRC has substantially increased scrutiny of R&D claims in recent years. Claims with aggressive qualification of costs, inadequate technical narratives, or involvement of certain claims preparation services have been challenged. Before using a loan to bridge an R&D credit, ensure the underlying claim has been properly prepared and reviewed by a reputable adviser, so the credit it is bridging is well-founded.

A disallowed or reduced claim does not affect the validity of the bridging loan or the deductibility of the interest, but it does affect your ability to repay from the expected source. Plan for downside scenarios.