Guarantor loans offer a route to borrowing for people who can't qualify for a standard unsecured loan alone, usually due to limited or poor credit history. But the arrangement involves a second person — the guarantor — taking on real financial risk, and both parties should go in with eyes fully open.
How a guarantor loan works
A guarantor loan is an unsecured personal loan where a second person — typically a family member or close friend with a stronger credit history — agrees to make the repayments if the main borrower fails to do so. The guarantor doesn't receive any of the loan funds themselves; their role is purely to provide a financial backstop that reduces the lender's risk.
Why guarantor loans carry higher rates than mainstream loans
Despite having a guarantor as security, guarantor loans typically carry considerably higher interest rates than mainstream unsecured loans, largely because they're specifically designed for borrowers who wouldn't otherwise qualify for standard lending — the guarantor reduces the lender's risk enough to approve the loan, but doesn't bring the rate down to mainstream levels.
What becoming a guarantor actually means
- You are legally committing to repay the full loan if the main borrower doesn't — not a partial share, but potentially the entire outstanding balance
- Missed payments by the main borrower can affect your own credit file if you're then called upon and also fail to pay, or in some cases even before that depending on the lender's reporting practices
- Being a guarantor is typically a multi-year commitment, matching the loan term, during which your own financial flexibility may be constrained
- Some lenders may factor your guarantor commitment into your own future borrowing assessments, as a contingent liability
Questions a prospective guarantor should ask
- What is the full loan amount and term I'm guaranteeing?
- What is the total amount repayable, including interest, that I could be liable for?
- How and when would the lender contact me if the borrower missed a payment?
- Would my own credit file be affected, and under what circumstances?
- Is there any circumstance under which I could be released from the guarantee early?
Questions the main borrower should ask themselves
- Am I confident I can maintain these repayments for the full term, given my actual income and expenses?
- Have I compared this guarantor loan's APR against other options, including credit unions or credit-builder products?
- Am I comfortable with the relationship pressure that could arise if I ever struggled to pay and my guarantor had to step in?
Alternatives to consider first
Before committing to a guarantor loan, it's worth checking whether a credit union — often significantly cheaper, and sometimes more understanding of individual circumstances — might be able to help, or whether a credit-builder card or loan could achieve a similar goal (accessing credit and building a track record) at lower cost and without involving a second person's financial exposure.
Worth reading next: our guide on The Reality of Bad Credit Loans in the UK, and Guarantor and Joint Mortgages: A Practical Guide.
Our free Loan Repayment Estimator can help you check this against your own figures.
The bottom line
Guarantor loans can be a legitimate route to borrowing for those who can't qualify alone, but the arrangement places genuine financial risk on the guarantor — not just a formality, but a real commitment that should be discussed openly and honestly between both parties, with a clear understanding of the worst-case scenario, before any agreement is signed.