When you make a registry entry for paying taxes using a Tax category Quicken will ask you if it is for the prior year, you'll specify which, and then when that transaction clears and you're reviewing downloaded transactions Quicken will ask the exact same question again? Quicken also will do it a third time when you Reconcile the transaction.
Why isn't Quicken storing this Tax Year information the first time when you enter it? It's just annoying to have to answer multiple times.