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Under what circumstance will the IRS charge you a late-payment penalty for taxes?
The IRS provides a little more information on the subject on this FAQ: Will I be charged interest and penalties for filing and paying my taxes late?: If you did not pay your tax on time, you will generally have to pay a late-payment penalty, which is also called a failure to pay penalty. Some guidance on what constitutes "reasonable cause" is found on the IRS page Penalty Relief Due to Reasonable Cause: The IRS will consider any sound reason for failing to file a tax return, make a deposit, or pay tax when due. Sound reasons, if established, include: Note: A lack of funds, in and of itself, is not reasonable cause for failure to file or pay on time. However, the reasons for the lack of funds may meet reasonable cause criteria for the failure-to-pay penalty. In this article from U.S. News and World Report, it is suggested that the IRS will generally waive the penalty one time, if you have a clean tax history and ask for the penalty to be waived.  It is definitely worth asking them to waive the penalty.