If you are among the small minority of taxpayers who’ve waited until April 15 to mail your tax returns — rather than e-file them — don’t wait until Tuesday night to execute your eleventh-hour plan.

Filing taxes is a yearly ritual for millions of Americans, yet not everyone navigates this process without stumbling. Errors ...

According to the IRS, the change is designed to protect taxpayers, speed up refunds and cut costs. “Most individual taxpayers ...