Lending Money to Family Goes Wrong for One Predictable Reason
Informal loans fail because neither side agreed what 'informal' actually means, here's how to lend, gift, or say no without wrecking the relationship.
By Firoz Khan|24 July 2026|Updated 20 September 2026|8 min read
'Just pay me back when you can' sounds generous, and it's actually the single sentence most responsible for family money disputes in the UK. It sounds flexible but it defines nothing, no amount, no date, no expectation, which means both sides walk away with a completely different understanding of what just happened, and that gap is where resentment grows. The problem with lending to family and friends is almost never the money itself, it's the absence of the boring admin that any bank would insist on and that awkwardness makes you skip. Here's how to do it properly, and how to say no when you shouldn't do it at all.
Why informal loans go wrong
A loan between family members has no contract, no interest rate, no fixed date, and crucially, no consequence for missing a repayment, there's no credit score at stake, no default notice, nothing forcing a conversation if the money doesn't come back. That absence of structure feels like trust, but it actually removes the one thing that makes any loan function: a shared, specific understanding of the terms. Research on family lending consistently finds that vague loans are far more likely to damage the relationship than loans with clear, written terms, precisely because ambiguity lets each side quietly rewrite the deal in their own memory over time.
Setting terms in writing
Before any money changes hands, agree in writing (even a simple email or shared document counts) on: the exact amount, whether it's a loan or a gift, the repayment schedule if it's a loan, whether interest applies, and what happens if repayments are missed. This isn't distrust, it's the opposite, it's removing ambiguity so trust doesn't have to carry the weight of unstated assumptions. A one-page document signed by both parties, even without a solicitor, gives you something concrete to refer back to if memories diverge later, which they usually do, both sides tend to remember the terms that suited them best.
Deciding whether it's a loan or a gift
Decide this explicitly before lending, not after the money doesn't come back. If you genuinely can't afford to never see the money again, it needs to be treated as a real loan with real terms, and you need to be honest with yourself about whether you can actually enforce those terms against a family member if it comes to it, most people can't and won't. If you can afford to lose the money entirely, framing it as a gift from the outset removes the repayment expectation altogether and, counterintuitively, often protects the relationship better than a loan that quietly turns into a grudge when repayment stalls or never happens.
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Gifting rules and the 7-year inheritance tax rule
Gifts of money in the UK are generally not taxed on the way out for the giver in the moment, but they can matter for inheritance tax later. Gifts you make are classed as 'potentially exempt transfers', meaning they fall entirely outside your estate for inheritance tax purposes only if you survive 7 years after making them. Die within 7 years and the gift can be pulled back into your estate's value, taxed on a sliding scale (taper relief) that reduces the tax owed the longer you survived past the gift, from 40% if you die within 3 years down to 8% between 6 and 7 years. There's also an annual exemption of £3,000 you can gift each year without it counting towards the 7-year rule at all, plus smaller exemptions for wedding gifts and regular gifts from surplus income. This mostly matters for larger gifts and larger estates, but if you're gifting a meaningful sum, particularly to help with a house deposit, it's worth understanding rather than assuming it's simply outside the tax system entirely.
Helping with a house deposit specifically
Gifted house deposits are common enough that mortgage lenders have standard paperwork for them, a 'gifted deposit letter' confirming the money is a genuine gift with no expectation of repayment and no stake in the property. Lenders require this specifically because an undeclared loan disguised as a gift changes the borrower's actual debt position and affordability, and can constitute mortgage fraud if discovered. If you're helping a family member buy a home, be upfront with them and their lender about whether it's a gift or a loan from the start, trying to have it both ways creates legal and relationship risk that's entirely avoidable with one honest conversation.
How to say no without damaging the relationship
You're allowed to say no, and a clear no, said kindly and early, does less damage to a relationship than a reluctant yes that turns into resentment six months later when the money doesn't come back. Be honest about the reason rather than inventing an excuse: 'I can't afford to lend that without putting my own finances at risk' is a complete, defensible sentence that doesn't require further justification. Offering an alternative, helping them think through their options, pointing them to free debt advice charities like StepChange or National Debtline, can be genuinely useful support that doesn't put your own money on the line.
Where most people get this wrong
The biggest mistake is lending an amount you can't actually afford to lose, on the private assumption that of course it'll come back because it's family, then being financially and emotionally blindsided when it doesn't. Before lending anything, ask yourself honestly: if this money never returns, does that change my own financial situation meaningfully? If the answer is yes, either lend a smaller amount you genuinely can afford to lose, or say no. The second mistake is skipping the written terms specifically because it's family, on the theory that a contract implies distrust, when in reality the informality is what causes the distrust later, not the document that could have prevented it.
A reminder
The FCA risk warning still applies to higher-risk crypto content. Always assess how much risk you are willing to take before buying.
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