Using Equity and Debt Together for UK Business Growth
Julian Marks
CEO · Oct 20, 2026 · 8 min read
The most successful UK businesses rarely fund their growth from a single source. The optimal capital structure for a growing business combines equity and debt in proportions that maximise growth rate, minimise dilution, and maintain financial resilience. Understanding when to use each, and how the two interact, is one of the most strategically important finance decisions any UK business director or founder makes.
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The logic of combining equity and debt
Equity is permanent capital: it never needs to be repaid and carries no interest cost. But it is expensive in dilution terms - every pound of equity raised at a given valuation reduces the founder's stake. Debt is temporary capital: it must be repaid, with interest. But it is cheap in dilution terms - borrowing £500,000 at 7% costs £35,000 a year in interest but nothing in equity.
The optimal blend depends on the cash flow profile of the business. A business with strong, predictable cash flows can comfortably service significant debt, preserving equity for high-return, high-uncertainty investments. A business with variable cash flows or a long payback horizon should hold more equity and less debt, maintaining the financial flexibility to ride out difficult periods.
Staging equity and debt through growth
A common structure for UK scaling businesses is to raise equity to fund the high-uncertainty early stages of a new product or market, establish the business model, and then layer debt onto the stable cash-generating business once it is proven. This sequencing uses each type of capital at its point of highest efficiency.
Venture debt, which adds debt capital alongside an equity round, is an explicit version of this approach. By adding 25-35% of the equity round as debt, the company extends its runway without diluting further. For UK businesses in the £1M-£20M ARR range, this is an increasingly common and rational structure.
"The founders who reach exit with the most value are almost invariably those who used debt intelligently to avoid diluting their equity stake at each growth stage."
- Julian Marks, CEO
The dilution trap and how to avoid it
The most common capital structure mistake by UK founders is over-reliance on equity: raising too many rounds at too early a stage, accepting excessive dilution for capital that could have been funded by debt. By the time they reach a significant exit or growth milestone, the founder's stake has been diluted to the point where the financial outcome is disappointing despite the business's success.
Building a deliberate debt capacity alongside each equity round - and using it before going back to equity markets - preserves more of the eventual value for founders and existing shareholders. This requires cash flow discipline and a willingness to manage debt service, but the long-term equity preservation is significant.
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Frequently Asked Questions
What is the right debt-to-equity ratio for a growing UK business?
There is no universal answer. Capital-intensive businesses (property, manufacturing) can carry more debt against their assets. Service businesses should generally carry less. The key test is whether EBITDA comfortably covers debt service with adequate headroom.
Can I raise equity and debt at the same time?
Yes. Venture debt is specifically designed to layer alongside an equity round. Many UK businesses also use term loans alongside investor capital for specific capital requirements.
Does debt financing affect my ability to raise equity in the future?
It can. Significant debt on the balance sheet affects the business's risk profile and may influence how equity investors assess the business. Covenants that restrict further fundraising without lender consent are also common in structured debt arrangements.
The bottom line
The equity-debt balance is one of the most consequential financial decisions any UK business makes. Getting it right requires both a clear understanding of your business's cash flow capacity for debt service and a disciplined approach to equity dilution. Spark Finance helps UK businesses at growth stage assess their optimal capital structure and access the debt component efficiently.
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