Getting them wrong isn’t a felony. Refusing to pay after they inform you you were wrong might be a felony.
But they won’t tell you you were wrong for a few years, during which time interest accrues.
(Source, just paid 5k in taxes+interest for the 2021 year after IRS sent me a letter saying my stock selling profit calculations were off by 4.5k. I think they were wrong (I was certainly wrong too) but I can file an update and get a refund on my next taxes if so. Better to stop the interest accessing while I figure out my bases)
But they won’t tell you you were wrong for a few years, during which time interest accrues.
(Source, just paid 5k in taxes+interest for the 2021 year after IRS sent me a letter saying my stock selling profit calculations were off by 4.5k. I think they were wrong (I was certainly wrong too) but I can file an update and get a refund on my next taxes if so. Better to stop the interest accessing while I figure out my bases)