Guarantor Mortgage: What It Is, Who Qualifies, and What It Costs Your Cosigner

A guarantor mortgage lets a relative or close friend back your mortgage with their income and credit so you can qualify when your own numbers fall short. It can make a difference as prices stay high: the average new home sold for $494,400 in the third quarter of 2026, according to the Federal Reserve Bank of St. Louis, about 27% more than in 2020.

It usually means adding someone to your loan as a cosigner, and they become responsible for the full balance alongside you.

What is a guarantor mortgage?

A guarantor mortgage is a type of home loan in which someone close to you, such as a parent or sibling, agrees to financially guarantee the loan. In most cases, a guarantor backs your loan by signing it with you, which makes them responsible for the full balance.

Some lenders also let a family member pledge savings or investments as extra security, which can reduce or replace your down payment. If the loan defaults, however, the lender can claim both the home and the pledged assets. And any late payments can show up on both of your credit reports.

In the U.S., guarantor mortgages are usually in the form of nonoccupant co-borrower mortgages or cosigner mortgages.

• Nonoccupant co-borrower mortgage. Like a guarantor, the co-borrower won't live in the home but signs the loan and may also be on the title.
• Cosigner mortgage. The cosigner signs the loan and owes it jointly with you but isn’t on the title.

Read more >> What Credit Score Do You Need to Buy a House?

Who needs a guarantor on a mortgage?

You may benefit from a guarantor mortgage if you don't meet a lender's borrower requirements on your own. For example:

• Your credit score is low or your credit file is thin. On a conventional loan, the lender averages your score with your cosigner’s to check the minimum. On an FHA loan, the lowest score counts, so a cosigner won’t help you clear it.
• Your debt-to-income ratio is too high on your own. That’s the percentage of your monthly income that goes to debt. A guarantor’s income can bring it down, but their debts count too.
• You need a bigger loan than your income supports. A guarantor’s income may help you qualify for more. You’ll still need the down payment, and with a cosigner on a conventional loan, the minimum is 5%.

A guarantor can provide extra support so you can become a homeowner sooner rather than waiting until your situation improves.

Read more >> 11 Questions to Ask a Mortgage Lender Before Applying

‍Signing soon? Get a second set of eyes first
‍A HUD-approved housing counselor can walk you and your guarantor through the numbers together for free or at low cost. Find a HUD counselor near you.

Your guarantor will owe the full loan, so they may also want a licensed attorney to review the terms before signing.

Who can be a guarantor?

To act as a guarantor, a person typically needs good credit and secure finances. Lenders qualify a guarantor much like they qualify you, looking for someone who:

• Has solid credit. On a conventional loan, their score is averaged with yours to check the lender’s minimum. On an FHA loan, the lowest score on the loan is the one that counts.
• Earns enough to cover your mortgage on top of their own debts. The lender counts their debts along with their income, including their own rent or mortgage.
• Has savings or investments, if they’re pledging them. Assets aren’t required to cosign, but pledging savings or investments can provide extra security for the loan.

A guarantor is often a parent, grandparent, or other close family member, but a friend can qualify on a conventional loan. On an FHA loan, a family member keeps the standard 3.5% down payment, while a non-family co-borrower raises it to 25%. Either way, your guarantor can’t be someone with a stake in the sale, such as the seller, the builder, or your real estate agent.

Read more >> How Can I Buy a House for the First Time?

Pros and cons of guarantor mortgages

Pros

• Become a homeowner sooner. Instead of waiting until you’ve saved more or built your credit, a guarantor can help you qualify now.
• Qualify for a higher loan amount. Lenders count your guarantor’s income along with yours, which may let you borrow enough to buy where you want to live.
• May help you meet minimum credit scores. On conventional loans, the lender averages your score with your cosigner’s to check the minimum. (FHA loans use the lowest score instead.)

Cons

• Your guarantor owes the full balance with you. The lender can come after either of you, and late payments can show up on both of your credit reports. Falling behind can hurt them financially, not just you.
• It won’t lower your down payment. With a cosigner who won’t live in the home, a conventional loan requires at least 5% down (instead of 3%).
• Your rate is priced on the lowest score on the loan. Even if your cosigner’s credit helps you qualify, your rate is usually set by your own score.

What it looks like on a $400,000 home

Here’s the minimum down payment in four common scenarios.

Lenders base these figures on the lower of the purchase price or the appraised value, and closing costs come on top. If a family member wants to help with the cash itself, a down payment gift may go further than cosigning.

How to apply for a guarantor mortgage

If you decide to pursue a guarantor mortgage, follow these steps:

1. Talk to your prospective guarantor. Make sure your guarantor is fully on board with your plan, and understands the risks and responsibilities they will be taking on.
2. Review your credit and finances. Pull your free reports from all three bureaus at AnnualCreditReport.com, and understand the mortgage payments you can afford along with unexpected housing expenses.
3. Shop around for lenders. Ask each lender how it handles cosigners and nonoccupant co-borrowers.
4. Gather financial documentation. Collect financial documentation for yourself and the guarantor, including bank statements, tax returns, pay stubs, and proof of assets.
5. Apply for a loan. Tell the lender you plan to use a guarantor, and prepare to answer questions about your financial situation. If you’re approved, review the loan terms together with your guarantor before signing.

Run the numbers >> Use Kikoff’s mortgage calculator to estimate your monthly payment and plan your homebuying budget.

Alternatives to guarantor mortgages

If you don't know anyone who is willing to act as a guarantor or if you want to buy a home entirely on your own, there are other options.

Build your credit

If your credit profile is thin, focus on building your credit. Paying down existing debt, making your payments on time, and limiting new credit applications can help you improve your credit, putting you in a better position to buy a home later.

‍Your rent could count too
‍Rent is often the biggest bill you pay, and often the one your credit report never sees. Kikoff’s Rent Reporting adds your on-time payments to your Equifax and TransUnion reports, turning a payment you’re already making into credit history.

Save a larger down payment

You can find programs requiring low or no down payments, but saving a larger down payment can boost your odds of qualifying for a mortgage. It reduces the amount of money you need to borrow and shows the lender you're in a more secure financial position, so the lender is more likely to approve your application.

Apply for a government-backed loan

Government-backed loan programs have lower down payment and credit score requirements. (FHA loans allow 3.5% down with a 580 score, or 10% down with a score between 500 and 579.) These programs help borrowers who may not meet lenders' conventional mortgage requirements become homeowners.

Ask about a down payment gift

Not everyone who wants to help with a home is ready to cosign. A gift toward your down payment provides support without the giver on the hook for your loan.

Conventional loans allow the entire down payment to come from a gift. And the giver doesn’t have to be a relative: a domestic partner, a fiance, or someone with a longstanding familial or mentorship relationship with you can qualify.

Your lender will ask for a letter signed by the giver that includes the amount, their contact details, and a note they don’t expect to be repaid. You’ll also need to keep track of bank transfers or checks to confirm the gift.

Read more >> First-Time Homebuyer Programs: What’s Available in All 50 States

Bottom line

A guarantor can help you qualify by adding their income and credit to yours, but they take on the full loan with you, and it won’t lower your down payment or your rate. On most mortgages, your rate is set by the lowest credit score on the loan, which is usually yours.

That’s the one thing a cosigner can’t lend you. Kikoff’s Credit Account reports your on-time payments to Equifax, Experian, and TransUnion, with no credit check to sign up. Plans start at $5 a month.