11/12/2025
In the past two days, I have been asked by two different customers about the 50 year mortgage proposal floated by the administration. So without going into the politics, let just look at the facts and math of a 50 year fixed mortgage.
For historical context, a 40 year mortgage was previously tried. There was even a 40 year mortgage, where the first 10 years was interest-only. This meant that after 10 years, the principal balance was the same but then you had the payments increase to include the principal for another 30 years. Needless to say, neither or these options were widely used and did not catch on.
Here is what the math looks like for a 50 year mortgage: If you were to take out a $300,000 mortgage today at a 6.25% interest rate, the principal and interest portion of the payment would be $1847.15 (this does not include escrows for taxes, homeowner's insurance, or mortgage insurance). If you were also able to take out a 50 year mortgage at the same interest rate as the 30 year, the payment would go down to $1634.92, which is only about $212.23 less per month. However, on the 30 year fixed if you just make the minimum payments over the life of the loan, the total amount of interest charged would be $364,975, but on the 50 year it would be $680,952, almost double the amount of interest. You would also be much slower to increase the equity in the home because that $212.23 difference is going straight towards principal. Also, keep in mind the interest rate for a 50 year term would more than likely be higher than a 30 year, which makes the monthly payment savings lower, and the lifetime difference in interest higher.
The reason that this 50 year mortgage was floated was because there is an issue with home affordability at this time, caused by inflation, rising prices, and higher interest rates. Since the 2008 recession, new home construction has not meet the needs of our increasing population. This is a situation of the supply is not meeting the demand. Economics 101 teaches you that if you have scarcity of supply and higher demand, prices will rise. If payments were lowered by offering a longer term, or by lowering interest rates, it would further increase the demand side of the equation as more people would become eligible to purchase, but not help the supply side. There needs to be supply-side solutions to housing affordability, which is a post for another time. For now, a 50 year fixed option is not the right solution for housing affordability.
Feel free to provide a comment below with any questions, and if I can ever help you with your mortgage needs, please feel free to call me at 850-322-1325.