Lending money to your child so they can start or grow a business sounds straightforward until it goes wrong. And when it goes wrong inside a family, the fallout is both financial and personal. The parent who “just wanted to help” finds themselves an unsecured creditor in an insolvency, or discovers HMRC treats the arrangement as a gift, or watches a divorce settlement carve up the loan as though it never existed. These outcomes are entirely preventable — but only if you treat the transaction with the same rigour a commercial lender would from day one.
Why “We’ll Sort It Out Later” Is the Most Expensive Sentence in Family Finance
Most family business loans begin with a conversation over dinner and a bank transfer the following morning. No written agreement, no interest rate, no repayment schedule. The implicit assumption is that trust replaces paperwork. It does not. Without formal documentation, you face three immediate problems. First, HMRC may treat the advance as a gift rather than a loan, with potential inheritance tax consequences if you die within seven years. Second, if your child’s business fails and enters administration, an insolvency practitioner will scrutinise any undocumented family loan and may challenge it as a preference or transaction at undervalue. Third, if your child separates from a spouse or partner, the family court may disregard an undocumented loan entirely when dividing matrimonial assets.
Every one of these risks is eliminated or dramatically reduced by a properly drafted loan agreement executed as a deed.
Gift Versus Loan: The Distinction That Matters Most
HMRC does not care what you intended. It cares what you can prove. If there is no written agreement, no interest, no repayments, and no enforcement mechanism, the “loan” looks indistinguishable from a gift — and HMRC will treat it as one. The consequences are significant:
- Inheritance tax: A gift is a potentially exempt transfer (PET). If you die within seven years of making it, the full amount may be added back to your estate and taxed at up to 40%.
- Capital gains tax: If your child uses the money to acquire business assets and later sells them, the base cost calculations become murky without clear documentation of the capital structure.
- Income tax: If you charge interest, that interest is taxable income for you. If you charge no interest, you avoid the income tax liability but strengthen HMRC’s argument that the arrangement was really a gift.
The pragmatic middle ground is to charge a modest but genuine interest rate — even 1% or 2% above the Bank of England base rate — and actually collect it. This creates an unmistakable audit trail that the arrangement is a commercial loan, not parental generosity dressed up as debt.
Who Is the Borrower? Get This Wrong and Everything Else Fails
If your child is trading through a limited company, the borrower should almost always be the company, not your child personally. Lending to your child personally when the money is destined for the company creates several problems: the company may not be able to deduct the interest as a business expense, the loan sits outside the corporate structure in an insolvency, and tracing the funds becomes unnecessarily complicated.
However — and this is where many parents get caught — if the company is the borrower and it fails, you are an unsecured creditor ranked behind HMRC, employees, and any secured lenders. Your recovery may be pennies in the pound, or nothing. If this risk is unacceptable, you need to take a personal guarantee from your child alongside the company loan agreement, or take security over specific assets. Be honest with yourself about whether you can stomach losing the money entirely. If you cannot, structure accordingly.
The Loan Agreement: What It Must Contain
A robust family business loan agreement should be executed as a deed, not a simple contract. The practical reason is limitation periods: obligations under a deed are enforceable for 12 years, compared with just 6 years for a standard contract. Given that family business loans often have long or informal repayment horizons, this extended period provides crucial protection.
The agreement should cover, at minimum:
- Principal amount and the date of advance.
- Interest rate — fixed or variable, and when it accrues.
- Repayment schedule — monthly, quarterly, or bullet repayment at term end. Specify exact dates.
- Term — a defined end date. Open-ended loans invite disputes and weaken your position with HMRC.
- Events of default — missed payments, insolvency, change of business activity, breach of agreed financial covenants.
- Remedies on default — acceleration of the full balance, right to appoint a receiver if you hold security, right to enforce the personal guarantee.
- Restrictions on the borrower — no further borrowing above a threshold without your consent, no dividend payments while the loan is outstanding, mandatory financial reporting to you quarterly or annually.
- Prepayment provisions — can the borrower repay early, and if so, is there a fee?
Security, Guarantees, and the Family Home
Taking a charge over business assets — equipment, stock, intellectual property — is sensible for larger loans. Register the charge at Companies House within 21 days of creation; an unregistered charge is void against a liquidator. For significant sums, some parents take a second charge over their child’s residential property. This is legally possible but emotionally fraught: if your child defaults, are you genuinely prepared to enforce a charge that could result in the sale of their home? If the answer is no, do not take the charge. A security interest you will never enforce is worse than no security at all, because it creates a false sense of protection.
Tax Implications You Cannot Afford to Ignore
For you as lender: Any interest you receive is savings income and must be declared on your self-assessment tax return. If you are a higher-rate taxpayer, you will pay 40% on the interest received. Factor this into the rate you charge.
For the borrowing company: Interest paid on the loan is generally deductible as a business expense, provided the loan is used wholly and exclusively for the purposes of the trade. If HMRC considers the interest rate uncommercial — either too high (suggesting disguised profit extraction) or at zero (suggesting a gift) — they may disallow the deduction or reclassify the payment.
Inheritance tax planning: A genuine, documented loan is a debt owed to your estate. On your death, the outstanding balance is an asset of your estate and will be subject to IHT. However, this is still preferable to an outright gift made less than seven years before death, where you lose both the capital and the tax efficiency. You can, of course, forgive portions of the loan annually within your £3,000 annual gift exemption, gradually reducing the estate’s exposure.
What Happens If the Business Fails
You need to confront this possibility before you lend, not after. If the company enters creditors’ voluntary liquidation, the liquidator will examine all transactions with connected parties in the two years preceding insolvency. A loan made at arm’s length on commercial terms, properly documented and consistently serviced, will withstand scrutiny. A poorly documented arrangement with no repayments and no interest will be challenged — and may be set aside entirely under the Insolvency Act 1986.
If your child traded as a sole trader or in partnership rather than through a limited company, the stakes are higher: they are personally liable for all business debts, and your loan competes with every other creditor against their personal assets.
The Conversation You Must Have Before the Money Moves
Sit down with your child and a solicitor — the same solicitor should not act for both of you, to avoid conflicts of interest — and agree the terms in writing before a single pound changes hands. Discuss what happens if the business fails, what happens if your child wants to bring in a new business partner, and what happens if you need the money back unexpectedly for your own care needs. These conversations are uncomfortable. They are infinitely less uncomfortable than the alternatives: a destroyed relationship, an HMRC investigation, or watching your retirement savings vanish into an insolvent company with no prospect of recovery. Structure it properly, document it thoroughly, and treat it as what it is — a serious financial commitment that deserves professional rigour.
Disclaimer: The information provided in this article is for informational purposes only and should not be considered financial or legal advice. Property and lending laws in the United Kingdom vary and may change over time. We always recommend consulting with a qualified solicitor and mortgage broker before entering into a property purchase or financial arrangement with another party.
