Dear Liz: I felt your advice about using an inherited IRA to pay off a mortgage was spot on, but I would add one suggestion. The person could use their required minimum distribution (or a little extra) from the inherited IRA each year to pay down the principal on the mortgage. Then they could see what the remaining loan balance is when they are approaching retirement in 10 years.
Answer: That could be a good alternative if being debt free is more important than maximizing their returns. Using just the distributions to pay down the mortgage would allow the bulk of the money to continue earning tax-free returns as long as possible, while reducing the mortgage balance over time.
The letter writer might do better financially by investing the distributions, but using them to pay down the mortgage could get them closer to their desired goal of being mortgage free.