40-year mortgage: An explanation and the pros and cons

If you’re looking to buy or refinance a home, particularly in a high-cost area, affordability can be a challenge. A 40-year mortgage could help by stretching out payments over a longer time than a 30- or 15-year loan and therefore lowering monthly payments. Also called a 40-year home loan, this mortgage is not for everyone since it’s not widely available and comes with important tradeoffs.

So let’s look more closely at the 40-year mortgage, its pros and cons, and see if it might be right for you.

Key takeaways:

• A 40-year mortgage is one with a 40-year loan term.
• This could help with payment affordability, but you’ll pay more due to the higher interest rate and longer term.
• Rates may be fixed or adjustable but often come with additional features such as interest-only or balloon payments.

What is a 40-year mortgage?

A 40-year mortgage is a home loan with a repayment term of 40 years instead of 15 years or 30 years.

A 40-year mortgage is a nonqualified loan (non-QM). A qualified mortgage (QM) meets the Consumer Financial Protection Bureau’s consumer protection standards, one of which is a maximum loan term of 30 years.

A borrower with a 40-year term will pay more overall mortgage interest. Interest rates on 40-year loans also tend to be higher because it’s more difficult for investors to predict what inflation will do over 40 years than 30.

Because 40-year loans don’t meet the standard for qualified mortgages, lenders who offer them often do so with nontraditional mortgage features. That means lenders may offer 40-year mortgages that allow interest-only payments or require a large balloon payment at the end of the term.

A 40-year mortgage can refer to two different situations:

• A newly originated non-QM loan used for a purchase or refinance
• A loan modification, where an existing mortgage term is extended to 40 years to reduce payments

These two options are very different and will be explained fully below. It’s important to understand their distinctions.

How does a 40-year mortgage work?

A 40-year mortgage works like a conventional mortgage, just over a longer period. For instance, rather than the 360 months of payments with a 30-year mortgage, a 40-year mortgage includes 480 months of payments. As a nonqualified loan, it also can include an interest-only term with a balloon payment at the end and a fixed-rate mortgage with an interest-only component.

To compare these options, let’s assume you’re buying a more expensive home with a $1.1 million loan amount at 6.5% interest.¹

The fully amortized option: If the loan is fully amortized like a conventional fixed-rate mortgage, the monthly payment for principal and interest is $6,952.75. At the end of your term, you’ll have paid $1,402,989 in interest. That’s in addition to the $1.1 million principal.

The interest-only option: If you borrowed the same amount but the loan required interest-only payments and the balance due at the end of the term, the monthly interest payment would be $5,958.33. You’d pay $2,860,000 in interest plus the $1.1 million principal at the end of the term.

The interest-only for a limited time option: More common than a balloon payment is a 40-year mortgage with an interest-only time frame at the beginning of the loan, often 10 years. After 120 monthly payments, the loan is amortized over 30 years with principal and interest payments. The payment for the first 10 years would be $5,958.33 a month, meaning you’d pay $714,999.60 in interest. After that, you’d pay $6,952.75 a month for the next 30 years. You’d spend a total of $1,402,989 in interest for a total interest payment of $2,117,988.60.

Comparing 30- vs. 40-year mortgages

The biggest difference between a 30-year and a 40-year mortgage is time, and that extra time directly affects how much interest you pay. Even if we take out the interest-only component, you would pay more interest solely based on the length of the term itself. Let’s look at the significant difference between a 30-year mortgage and a 40-year mortgage.

In other words, even if each loan has the same interest rate, the 40-year mortgage will cost more over the life of the loan. Here’s how a fixed-rate mortgage at 6.5% for $1.1 million differs when repaid over 30 years vs 40 years.

A 40-year term saves you $512.73 a month but costs $588,222.96 more in interest. And although our example has each loan given the same interest rate, in the real world, all things being equal, 40-year mortgages typically have higher interest rates than 30-year mortgages. This is because the longer repayment time equals more risk for lenders due to inflation, market uncertainties, and other factors. They charge a higher rate for this risk.

Which lenders offer a 40-year mortgage?

It can be challenging to find a lender that offers 40-year mortgages.

However, Rocket Mortgage offers a 40-year mortgage with the first 10 years being interest-only payments with loan amounts between $125,000 – $2 million.

Other features include:

• Down payment of 10% – 40% depending on the loan amount and whether you’re using the loan to buy a home or as a cash-out refinance
• 6 – 12 months of savings in the event of income loss
• 660 – 740 qualifying credit score
• 45% maximum debt-to-income ratio
• Single-unit homes only

Pros and cons of a 40-year mortgage

There are advantages and disadvantages to consider with a 40-year mortgage.

Pros

• It may be the lowest monthly payment you can get because of the longer term.
• The lenders who offer this may offer some different loan structures, like having interest-only terms to begin the loan so you can find an option that works best for you.

Cons

• You pay more interest over time, both because the interest rate tends to be higher and because the term is longer.
• The 40-year term means it’s a nonqualified mortgage. Because 40-year loans don’t meet government standards, lenders may add features that are riskier for the borrower, such as balloon payments.
• The home equity builds more slowly on a 40-year mortgage due to the longer term, which may make it harder to borrow your equity later. If there’s an interest-only time frame at the beginning of the loan, no equity builds during this period.

Alternatives to a 40-year mortgage

A 40-year mortgage isn’t the only way to manage monthly payments. In some cases, a more traditional loan may better support long-term financial goals.

• Conventional mortgages: Conventional mortgages are private loans. Conforming conventional loans follow federal guidelines and typically offer terms ranging from 8 to 30 years. Credit score and down payment requirements vary by lender and loan program, and first-time home buyers may qualify with low down payment options starting at 3%. You can avoid private mortgage insurance (PMI) with a down payment of 20% or more, and you can usually request PMI removal once you reach 20% equity. This might be a good choice if you have strong qualification metrics and want to pay less in interest over the life of your loan than you would with a 40-year mortgage.
• Jumbo loans: A jumbo loan is a conventional mortgage that exceeds the conforming loan limit. Jumbo loans are usually used to buy more expensive homes. Since they don’t have to meet any federal requirements, the requirements and terms are at the discretion of the individual lender. In general, you can expect to need a down payment of at least 10% and meet more rigorous requirements for a minimum credit score and a maximum debt-to-income ratio. You may also be required to have sufficient cash reserves to cover 18 months of mortgage payments. If you’re buying an expensive property and want to save money in interest over the life of your loan, compared to a 40-year loan, a jumbo loan might be a good choice.
• Federal Housing Administration loans: FHA loans are available for primary residences with a 3.5% down payment. Most lenders, including Rocket Mortgage, require a credit score of 580². However, it’s possible to qualify with a score as low as 500 with a 10% down payment. There is mortgage insurance for the life of the loan if your down payment is less than 10%. If your score is not excellent and it would be difficult to qualify for a competitive rate on a 40-year loan, an FHA loan could be a good option.
• Veterans Affairs loans: Eligible military personnel, veterans, reservists, and National Guard personnel can buy a home with no down payment loan with a VA loan³. Although the VA sets no minimum, the credit score for a VA loan from Rocket Mortgage is 580. There are exemptions, but typically, a VA funding fee of between 0.5% and 3.3% is paid up front or built into the loan. If you qualify for a VA loan, it could be a great money-saving option that has the potential to save you money both at a lower rate and for a shorter term than a 40-year loan. Also, VA loans do have 40-year options, but you must meet certain qualifications.

The bottom line: Consider your options

A 40-year mortgage can lower your monthly payments – but there’s a trade-off. It increases long-term costs and can limit your flexibility. It can make sense, but it’s not for everyone, which is why it’s not a standard or widely available option. If you consider a 40-year mortgage, it’s vital that you weigh short-term affordability against your long-term financial goals.

With a decision as important as financing a home, it pays to consider every option carefully and possibly seek the advice of trusted professionals.

When you’re ready to start your home buying journey, you can apply for the loan that best suits your life goals at Rocket Mortgage.

¹ The interest-only payment on a $1.1 million 40-year interest-only fixed-rate loan at 6.5% is $5,958.33. After 10 years, you make a fully amortized payment of $6,952.75 The annual percentage rate (APR) is 6.672% and the loan-to-value ratio (LTV) is 70% for the cost of 1.681 points ($18,491) due at closing. One point is equal to one percent of the loan amount. Payment does not include taxes and insurance premiums. The actual payment amount will be greater. Rates shown valid on publication date of October 12, 2025. Some state and county maximum loan amount restrictions may apply.

² To qualify for this offer, you must meet all standard FHA eligibility requirements. In addition, your total mortgage payment, including taxes and insurance, cannot exceed 38% of your income, your debt-to-income (DTI) ratio cannot exceed 45%, and you must have 12 months of verifiable housing history immediately prior to your application, no late payments 30 days or greater in the last 12-months, and no derogatory marks on your credit report. Not available on jumbo loans. Asset statements may be needed, no more than 1 day of non-sufficient fund fees are allowed in the most recent 2 months prior to application. Additional restrictions/conditions may apply.

³ Rocket Mortgage is a VA-approved lender, not endorsed or sponsored by the Dept. of Veterans Affairs or any government agency.