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The short answer
When you co-sign, the debt becomes yours as well as your friend's. The US Federal Trade Commission says a co-signer may have to pay up to the full amount plus late fees and collection costs, the creditor can usually collect from you without first chasing the borrower, and the loan can appear on your credit report. Even if your friend pays on time, the loan can count against your own ability to borrow.
Why the request comes
In a close community abroad, the request is familiar: a friend from church, a cousin or a former classmate needs a car loan, a tenancy or a phone contract, has no local credit history, and the lender wants someone with a better file to sign too. Saying yes feels like the natural thing. It is also one of the largest financial commitments you can make without receiving any money.
What you become liable for
The FTC's Cosigning a Loan FAQs (April 2024) set out the position in the US, and the principles are similar in many countries:
- You may have to pay up to the full amount of the debt if the borrower does not pay.
- You may also owe late fees or collection costs, which increase the amount.
- Under the federal Notice to Cosigner, the creditor can collect from you without first trying to collect from the borrower; some states require creditors to try the borrower first.
- The creditor can use the same methods against you as against the borrower, including suing you or garnishing your wages.
- Releasing you later requires both the lender and the borrower to agree, which the FTC says lenders are unlikely to do.
The CFPB adds, in its guide to co-signing and sharing credit, that both people on a joint account are liable, whereas an authorised user on a credit card is not legally responsible for the purchases. Its page on car loans says a co-signer is responsible even if they never drive the car.
What it does to your credit file
The FTC says the loan is your debt and can be reported to the credit bureaus under your name. Late payments or a default can appear on your report, and even when the borrower pays on time the loan can count against your ability to get credit, because lenders see it as a commitment you might have to meet. For someone who is still building a credit history abroad, a co-signed loan can take up borrowing room you need for your own mortgage or car.
Worked example
Example: Uche co-signs a $12,000 car loan for his friend. After paying down $4,000 of the balance, the friend loses his job and stops paying. The lender writes to Uche for the remaining $8,000. Two missed months have already added $70 in late fees and the lender has passed the account to a collector, whose costs are added too. Uche now owes over $8,070, the late payments sit on his own credit report, and his planned mortgage application is delayed.
Guarantors for rent and loans at home
A tenancy guarantor works in a similar way. Shelter (England) says agents usually check a guarantor's income and credit and may require them to be a homeowner. For tenancies signed from 1 May 2026, a guarantor's liability ends if the tenant dies, but otherwise the guarantee runs as the agreement says. In Nigeria, a guarantee for a loan is also a serious commitment: a CM Advocates note on Nigerian law says that, unless the contract provides otherwise, a creditor need not make a prior demand on the debtor or sue the debtor first before pursuing the guarantor, citing the Supreme Court's decision in CBN v Interstella. Being asked to stand as guarantor for a relative's loan at home therefore deserves the same care.
Before you sign
- Ask yourself whether you could pay the whole loan if your friend could not, without harming your own household.
- Ask the lender, in writing, for the total you could owe if the borrower defaults, as the FTC suggests.
- Ask for monthly statements, or a written promise to tell you about missed payments.
- Get copies of the loan agreement and every document you sign; the lender may not send them later.
- Check your credit report regularly while the loan runs.
- Agree in writing with your friend what happens if they cannot pay, and keep records of any payments you make for them.
- Consider safer help: a smaller gift, help with a deposit, or a reference rather than a signature.
If you have already co-signed
Stay close to the loan. Ask the borrower to share statements, set a reminder to check your credit file, and if a payment is missed, contact the lender at once; paying one instalment yourself may protect your file more than letting arrears build. If the borrower's circumstances change, ask the lender about restructuring early. Community associations that pool money face similar risks; running a community association's finances covers the controls.
Where Pryme fits
If you decide to help with a gift or a written loan instead, keep a clear trail: Pryme receipts and statements can be generated as regular or verifiable documents, and Send shows the rate and the fee before you approve a transfer.
Questions people ask
Am I responsible if my friend stops paying a loan I co-signed?
Yes. The FTC says you may owe up to the full debt plus late fees and collection costs, and the creditor can usually come to you without chasing the borrower first.
Does co-signing affect my credit score?
It can. The loan can be reported under your name, missed payments can appear on your report, and the debt counts against your borrowing.
Can I remove myself as a co-signer?
Only if the lender and the borrower agree, which the FTC says lenders rarely do.
Is a guarantor the same as a co-signer?
Not exactly, but both can be pursued for the debt. In Nigeria, a creditor generally need not sue the debtor first before pursuing a guarantor unless the contract says so.
Sources
- FTC: Cosigning a Loan FAQs (Apr 2024) · accessed Oct 2026
- CFPB: Building Blocks, cosigning loans and sharing credit (Summer 2022) · accessed Oct 2026
- CFPB: Why would I need a co-signer for an auto loan? · accessed Oct 2026
- Shelter England: Guarantors for private tenants (8 Jun 2026) · accessed Oct 2026
- CM Advocates: Contract of guarantee under Nigerian law · accessed Oct 2026
This article is general information, not financial, legal or tax advice. Products described are provided under the terms on this site and are subject to regulation and eligibility.