Loan agreements between founders and their startup: getting the paperwork right

Why founder loans need proper paperwork

Many early-stage startups survive on founder cash. You throw in £5,000 to cover a software subscription, or £20,000 to bridge a gap before investment lands. It is easy to treat this informally. That creates problems later.

Without a clear loan agreement, HM Revenue and Customs may treat the money as a capital contribution or a gift. Investors will ask pointed questions during due diligence. And if the company struggles, you risk losing your money with no legal claim.

Documenting a founder loan is straightforward. It takes a single agreement, properly drafted and approved. This post covers what to include, what to avoid and how to handle the board approval step.

When a loan makes sense for your startup

A founder loan is common when:

• the company needs working capital before a funding round closes
• you want to inject cash temporarily without altering the cap table
• you are lending alongside a convertible loan note or advance subscription agreement

It is not a substitute for proper equity investment. If you plan to leave the money in the company long term without a clear repayment expectation, consider issuing shares instead. Mixing the two without documentation creates ambiguity that tax authorities dislike.

Key terms your loan agreement should cover

Keep the agreement simple but precise. The core terms are:

Loan amount and drawdown

State the total amount and whether it is drawn in one lump sum or in tranches. If tranched, include a schedule.

Interest rate

You can lend at zero interest, but be aware that a zero-interest loan from a director can create a taxable benefit in kind if the amount exceeds £10,000 at any point in the tax year. Many founders charge a minimal interest rate, often at or slightly above HMRC's official rate, to keep things clean. Consult your accountant on this point.

Repayment terms

Specify a maturity date or event-based trigger, such as "repayable on completion of a qualifying funding round of at least £250,000." Avoid open-ended "when the company can afford it" wording. That undermines enforceability and looks weak to investors.

Early repayment

State whether the company can repay early without penalty. Normally it can, but write it down.

Subordination

This is critical for future investors. A subordination clause confirms your loan ranks behind any senior debt the company later takes on, such as a bank loan or venture debt. Without it, your personal loan could block institutional lending. Most investors expect founder loans to be subordinated as standard practice.

Default provisions

Define what constitutes a default (missed repayment, insolvency) and what rights you have. In practice, you may never enforce these against your own company, but having them in the agreement signals that the loan is a real, arm's length arrangement.

Board approval is not optional

A loan from a director to the company creates a conflict of interest under the Companies Act 2006. You must declare your interest to the board before the company enters into the agreement.

For a sole director, record a written resolution approving the loan terms and noting the conflict. For multiple directors, minute a board meeting where the borrowing director abstains from voting on the resolution to approve the loan.

This is not a formality. Failure to get proper board approval could make the loan voidable and create personal liability risks. File the board minutes or written resolution in your company's statutory register.

What investors will scrutinise

During fundraising, investors will review any outstanding founder loans. They typically want to see:

• a signed, dated loan agreement with clear terms
• board minutes approving the loan
• evidence that interest (if any) has been properly accounted for
• confirmation that the loan is subordinated or will convert as part of the funding round

If you intend the loan to convert into equity, use a convertible loan note structure from the start rather than trying to retrofit conversion terms later. An ordinary loan agreement is not the right document for conversion mechanics.

Documents you need on file

The document pack for a founder loan should include:

1. The loan agreement – executed by both the founder and the company (through an authorised signatory who is not the borrowing founder, if possible).
2. Board minutes or written resolution – approving the loan and recording the conflict declaration.
3. A record in the company's register of loans or directors' interests, if you maintain one.

Store these in your document hub alongside your other core company records. If you use StartupDocs, you can adapt a standard loan agreement template and run the board resolution through the platform's drafting tools.

Tax considerations at a glance

A few tax points to discuss with your accountant:

• Interest paid to the founder is taxable income and should be declared on your self-assessment return.
• A zero-interest loan above £10,000 may trigger a benefit-in-kind charge on the director.
• If the loan is written off, the company may have a taxable credit, and the founder may face income tax implications on the released debt.

Getting the paperwork right from day one makes the tax position clear and avoids surprises.

The bottom line

Lending money to your own startup is perfectly normal. Treat it with the same formality you would apply to any commercial loan. A two-page agreement and a board minute take little time and protect you, your company and your future investors.

If your loan structure is complex, or if a significant amount is involved, consult a solicitor to review the agreement before signing.