My spouse switched from a high deductible family insurance plan to Medicare during 2018. At that time, I switched to a high deductible self only insurance plan through the end of the year. Per TurboTax SuperUser dmertz, under the last-month rule I should contribute $4,350 (including catch-up) to my HSA. When I enter the info in TurboTax Deluxe, it calculates my allowable contribution by pro-rating the self only limit for the months I had self only coverage. How do I enter our insurance coverage to take advantage of the last month rule?
