Interest rates on cash are so low that making a year's worth of payments on my mortgage (15 year fixed at 5.5%) makes sense, but I think the way fixed rate mortgages work is that making large payments reduces the number of future monthly payments to be made but does not permit you to skip payments. So I would not be able to skip making payments for a year.
I wonder if anyone offers amortizing mortgages where extra payments allow the borrower to skip payments for a period of time (but not falling behind the amortization schedule). This would be different from the option adjustable rate mortgages that allow borrowers to fall behind the schedule of equivalent amortizing adjustable rate mortgages.