Your total tax due for the year will not be different (as long as you pay in such as way that you don't incur late penalties in any quarter). (money.stackexchange.com)
Because you could face a lifetime of Part D late penalties when you finally do sign up. (verywell.com)
You'll need to pay at least 90 % of the amount you owe by the tax deadline to avoid late penalties and interest charges. (novelinvestor.com)