Why a 50-Year Mortgage Is a Terrible Idea

Recently, there has been discussion in the news about the possibility of introducing a 50-year mortgage as an alternative to the traditional 30-year mortgage, which is the industry standard. At first, it might sound like an innovative solution to improve home affordability. However, upon closer review, it actually poses serious disadvantages for consumers.

The first issue is the timeframe to pay off the home loan. The average age of a first-time homebuyer has been steadily rising. Let's consider a typical 30-year-old buying their first home. If they opt for a traditional 30-year mortgage, they would pay off the home by the time they reach age 60. During retirement, they would only need to cover property taxes, insurance, and routine maintenance—costs that can already be burdensome in retirement. Now, if that same homebuyer opted for a 50-year mortgage, they would be 80 years old when the mortgage is paid off. That adds an extra 20 years of making principal and interest payments, along with the ongoing property expenses. This extended period, spanning ages 60 to 80, could delay their ability to retire fully.

Another major consideration is how much lower the monthly payment is with a 50-year mortgage compared to the amount the borrower will pay over the life of the loan. Intuitively, spreading payments over 50 years seems like it would drastically reduce monthly costs. While it does lower the monthly amount, the savings are not as significant as one might expect.

Let's review a real-world example of a home priced at $1,200,000 with a 20% down payment, so we don't have to consider the additional costs of private mortgage insurance, which is required when the deposit is less than 20%. A 20% down payment on $1.2 million is $240,000, leaving a loan amount of $960,000. Current interest rates are in the low to mid-6 range, so we'll use 6.25% for our example. We should expect a 50-year mortgage to have a higher interest rate, maybe by half a point, yet, for simplicity, we’ll keep it at 6.5%.

With the 30-year mortgage on $960,000, the monthly principal and interest payment would be approximately $5,907. For a 50-year mortgage, the monthly payment would be approximately $5,577. That’s a savings of just $330 per month, or roughly $3,960 annually.

The total interest paid over the life of the loan is the key factor. For a 30-year mortgage, the total interest would be approximately $1,170,520. For the 50-year mortgage, the total interest skyrockets to approximately $2,254,200—almost double. The total cost, including principal and interest, would be approximately $2,130,520 for the 30-year loan, compared to $3,214,200 for the 50-year loan.

Essentially, while the 50-year mortgage offers slightly lower monthly payments, the extended loan term and marginally higher interest rate result in paying nearly twice as much in interest over the life of the loan.

Another overlooked issue is the speed at which equity is built. Early in the loan, most payments are allocated toward interest, with only a small portion applied to reducing the principal. With a 30-year mortgage, homeowners build equity faster. Conversely, with a 50-year mortgage, it takes much longer before any significant equity is accumulated. If circumstances change—such as needing to sell or market declines—the borrower could find themselves in negative equity, increasing their risk of foreclosure.