Offer your thoughts or opinion on the input financial query or topic using your financial background.

Under what circumstance will the IRS charge you a late-payment penalty for taxes?
Years ago I mailed my personal tax return one day after the due date, and my check was deposited as normal, and I never heard anything about it. As an employer, I once sent in my employee's withheld federal taxes one day after the due date, and I later received a letter stating my penalty for being late worked out to be around $600. The letter stated that since this was my first time being late they would waive the fee. In both cases, they could have charged me a late fee if they wanted to.