Comparing a private family loan with a commercial guarantor loan helps you understand the real costs, risks, and paperwork involved in each route before you borrow. The family loan is often the under-considered option: when properly documented, it can be the lower-cost and more flexible route for borrowers who have a willing relative and are prepared to put the arrangement in writing.
This article is information only. It does not constitute financial advice, and it does not take your personal circumstances into account. If you are unsure which option suits your situation, speaking to an independent financial adviser or a free debt charity may help.
What is the difference between a family loan and a guarantor loan?
Both options involve a third person providing some form of backing. The key difference is who provides the backing and how the arrangement is regulated.
A family loan is a private agreement between you and a relative (or close friend). There is no lender, no FCA-regulated product, and no formal application process. The terms are whatever you both agree in writing.
A commercial guarantor loan is a product offered by an FCA-authorised lender. You borrow the money from the lender. A third person (the guarantor) promises to cover repayments if you cannot. The guarantor is usually a family member or friend, but the contract is between you, the guarantor, and the lender.
The two routes are genuinely different in structure, cost, and risk. Neither is universally the better choice.
How do the two options compare?
The table below sets out the main practical differences side by side.
| Factor | Family loan | Commercial guarantor loan |
|---|---|---|
| Who lends the money | A family member or friend | An FCA-regulated lender |
| Interest rate | Whatever you both agree (can be zero) | Set by the lender; often high (representative APRs can exceed 40%) |
| Credit check on borrower | None (unless you choose to run one) | Hard credit search by the lender |
| Credit check on guarantor | None | Hard credit search on the guarantor |
| Effect on credit file | Not reported (unless dispute reaches court) | Reported for both borrower and guarantor |
| Legal protection for borrower | Limited (not FCA-regulated) | Full consumer credit protections apply |
| Documentation required | A written loan agreement (strongly advisable) | Full consumer credit agreement |
| Flexibility of terms | High (set by agreement) | Low (set by lender) |
| Risk if things go wrong | Relationship damage; informal debt dispute | Credit file damage for borrower and guarantor; lender can pursue both |
| Tax considerations | Possible HMRC implications on interest-free or low-rate loans | None for the borrower (lender handles tax) |
When a family loan may be worth considering
A family arrangement can work well when:
- A family member has spare savings and is willing to lend at low or no interest.
- Both parties are comfortable putting the agreement in writing and sticking to it.
- Avoiding a hard credit search matters to the borrower.
- The amount needed is modest and the repayment period is short enough to be realistic.
- Both sides have discussed and accepted what happens if repayments are missed.
When a commercial guarantor loan may be worth considering
A commercial guarantor loan can be the more appropriate route when:
- No family member is in a financial position to lend the funds themselves.
- The borrower wants the legal protections that come with an FCA-regulated credit agreement.
- Both borrower and guarantor want a formal, independent structure rather than a personal arrangement.
- The amount required is larger and the borrower needs a defined repayment schedule set by a lender.
- The borrower wants to build a credit history (repayments are reported to credit reference agencies).
What to check before choosing either route
Before deciding, it is worth pausing on a few practical points for each option.
For a family loan
Get it in writing. An informal verbal agreement is very difficult to enforce if a dispute arises. A written loan agreement does not need to be drawn up by a solicitor, but it should cover: the amount, the interest rate (even if zero), the repayment schedule, and what happens if a payment is missed or the borrower can no longer repay.
Check HMRC's position on interest. HMRC's beneficial loan arrangement rules set out when an interest-free or low-interest loan creates a taxable benefit. These rules apply most commonly to employer-employee loans, but they can apply in other contexts. HMRC publishes the official rate of interest and the conditions under which a charge arises on GOV.UK. Checking with HMRC directly or with a tax adviser before agreeing terms is worth considering.
Think carefully about the relationship. Lending money can place real strain on close relationships, particularly if repayments fall behind. It can help to be honest about this risk before the money changes hands, rather than after.
Consider what happens if the lender needs the money back early. A commercial lender cannot demand early repayment outside the agreed terms. A family member informally can. The written agreement should address this.
For a commercial guarantor loan
Check the representative APR carefully. Guarantor loans often carry high interest rates. To make this concrete: on a £3,000 loan over 24 months at a representative APR of 49.9%, the monthly repayment would be approximately £175, and the total amount repayable would be around £4,200, meaning you would pay roughly £1,200 in interest charges on top of the amount borrowed. Rates and terms vary between lenders, so it can help to compare the total amount repayable across several products before applying.
The guarantor takes on real liability. If you miss payments, the lender will ask the guarantor to pay. That affects the guarantor's finances and their credit file. This is worth discussing fully before the guarantor agrees.
Understand the hard credit search. Both you and your guarantor will typically have a hard search on your credit files as part of the application. This is visible to other lenders for a period.
Consumer protections apply. Because this is an FCA-regulated product, you have rights under the Consumer Credit Act 1974, including the right to a clear credit agreement and certain rights to complain to the Financial Ombudsman Service if something goes wrong.
What can go wrong with each option?
Risks with a family loan
- Undocumented disputes. Without a written agreement, disagreements about terms are hard to resolve.
- Relationship breakdown. Financial tension between family members can be lasting and deeply damaging.
- No consumer credit protections. Because the loan is not FCA-regulated, you cannot complain to the Financial Ombudsman Service about the arrangement.
- Tax considerations. Interest-free or below-market-rate loans can, in some circumstances, attract HMRC scrutiny under the beneficial loan arrangement rules. Checking the current HMRC guidance before agreeing terms is advisable.
- Court action. If the family lender does pursue you for unpaid debt through the courts, a county court judgment (CCJ) could appear on your credit file.
Risks with a commercial guarantor loan
- High cost of borrowing. The interest rates on many guarantor loans are substantially higher than standard personal loans. The total cost over the full term can be significant (see the worked example in the section above).
- Damage to the guarantor's credit file. Missed payments affect both borrower and guarantor. The guarantor may find it harder to borrow in future.
- Pressure on relationships. Even with a formal lender, if the guarantor ends up covering payments, it can create personal tension.
- Long-term commitment. Guarantor loans often run for several years. Both borrower and guarantor are tied to the arrangement for that period.
Which suits whom?
There is no single answer, but the following if/then framing may help you think it through.
If a family member is willing and financially able to lend the full amount, and both parties are prepared to sign a written agreement, then a family loan is likely to be the lower-cost option and is worth considering first.
If no family member can lend the funds directly, or either party is uncomfortable with a private financial arrangement, then a commercial guarantor loan provides a regulated structure with defined terms.
If building a credit history matters to the borrower, then a commercial guarantor loan has the advantage, as repayments are reported to credit reference agencies; a family loan is not.
If the amount needed is large or the repayment period is long, then the higher cost of a commercial guarantor loan becomes more significant, and comparing the total amount repayable against the family loan alternative is a useful first step.
Being honest with the people involved before signing anything is important whichever route you take.
Free help and guidance
If you are considering either option because you are struggling financially, free confidential advice is available:
- StepChange Debt Charity, 0800 138 1111
- National Debtline, 0808 808 4000
- MoneyHelper, 0800 138 7777
These services are free of charge and can help you understand your options without any obligation.
Frequently asked questions
Does a family loan affect my credit score?
A properly documented private family loan is not reported to credit reference agencies, so it does not directly affect your credit score. However, if you miss payments and the lender takes you to court, a county court judgment could appear on your credit file.
Does a commercial guarantor loan affect my guarantor's credit score?
Yes. A guarantor loan is reported to credit reference agencies for both the borrower and the guarantor. If payments are missed, both credit files can be affected. The lender will typically run a hard credit search on the guarantor before approving the loan.
Are there tax implications on a family loan?
If the family loan is interest-free or at a low rate, HMRC's beneficial loan arrangement rules may apply in certain circumstances. These rules are most commonly relevant to employer-employee loans, but they can apply more broadly. Checking the current HMRC guidance or speaking to a tax adviser before agreeing terms is worth considering.
What should a family loan agreement include?
At a minimum: the names of both parties, the amount lent, the interest rate (even if zero), the repayment schedule, and what happens if payments are missed. Having it signed and dated by both parties and witnessed strengthens it further. Citizens Advice publishes guidance on writing a loan agreement, which you may find a useful starting point: citizensadvice.org.uk/debt-and-money/borrowing-money/.
Can a family member charge interest on an informal loan?
Yes. A family member can charge interest. If they do, they may need to declare that interest as income for tax purposes. If no interest is charged, HMRC's official rate of interest rules may still apply in certain situations.
What if the family member acting as lender needs the money back early?
A commercial loan has fixed terms, so the lender cannot demand early repayment. A family loan agreement can be more flexible, but that flexibility can also create uncertainty. The agreement should specify notice periods if the lender needs repayment sooner than planned.
Sources and further reading
- MoneyHelper, guidance on borrowing money: moneyhelper.org.uk/en/money-troubles/dealing-with-debt/borrowing-money-to-pay-debts
- Citizens Advice, guidance on borrowing money and loan agreements: citizensadvice.org.uk/debt-and-money/borrowing-money/
- HMRC, guidance on beneficial loan arrangements: gov.uk/guidance/beneficial-loan-arrangements-hmrc-official-rates
For more on guarantor loans, see the Jolly Good Guide to guarantor loans.
- Does a family loan affect my credit score?
A properly documented private family loan is not reported to credit reference agencies, so it does not directly affect your credit score. However, if you miss payments and the lender takes you to court, a county court judgment could appear on your credit file.
- Does a commercial guarantor loan affect my guarantor's credit score?
Yes. A guarantor loan is reported to credit reference agencies for both the borrower and the guarantor. If payments are missed, both credit files can be affected. The lender will typically run a hard credit search on the guarantor before approving the loan.
- Are there tax implications on a family loan?
If the family loan is interest-free or at a low rate, HMRC may treat the difference between the loan rate and the official rate of interest as a taxable benefit in some circumstances. This is a nuanced area; checking with a tax adviser or HMRC directly is worth considering before agreeing terms.
- What should a family loan agreement include?
At a minimum: the names of both parties, the amount lent, the interest rate (even if zero), the repayment schedule, and what happens if payments are missed. Having it signed and dated by both parties and witnessed strengthens it further.
- Can a family lender charge interest on an informal loan?
Yes. A family member can charge interest. If they do, they may need to declare that interest as income for tax purposes. If no interest is charged, HMRC's official rate of interest rules may still apply in certain situations.
- What if the family member acting as lender needs the money back early?
A commercial loan has fixed terms, so the lender cannot demand early repayment. A family loan agreement can be more flexible, but that flexibility can also create uncertainty. The agreement should specify notice periods if the lender needs repayment sooner than planned.