Owe the IRS and paid late? Estimate the failure-to-pay penalty and interest so you know roughly what you’re looking at — before you call.
This is a rough estimate using standard IRS rates (failure-to-pay 0.5%/month, failure-to-file 5%/month up to 25%, plus approximate interest). Your actual penalty depends on exact dates, rate changes, and your situation. Not tax advice — confirm with the IRS or a tax professional.