How high will long-term interest rates average over the next thirty years?
Core argument: CBO projects the interest rate on 10-year Treasury notes will average 3.8% over 2025–2055, similar to the 3.7% average of the past three decades, and stay roughly flat at 3.9% in the first decade and 3.8% in the third.
In CBO’s projections for the 2025–2055 period, the interest rate on 10-year Treasury notes averages 3.8%—similar to the 3.7% average recorded over the past three decades. The interest rate on 10-year Treasury notes remains roughly flat over the 30-year projection period, averaging 3.9% in the first decade and 3.8% in the third decade. The real interest rate on 10-year Treasury notes (calculated by subtracting the percentage increase in the consumer price index from the nominal yield on those notes) is projected to average 1.5% over the 2025–2055 period, 0.3 ppts higher than the average from 1995 to 2024. (Since 2008, the real interest rate on 10-year Treasury notes has averaged 0.1%.) In CBO’s assessment, interest rates are largely determined over the long run by structural factors, including demographic trends, people’s saving and investment behavior, and the amount of federal debt. CBO expects continued downward pressure on interest rates through 2055 because of changes such as slower growth of the labor force, more private domestic and foreign savings available for investment, and slower total factor productivity growth, relative to their averages over the past 3 decades.




