Anonymous wrote:You're going to have to pay and underpayment penalty.
Do the estimate on the IRS website.
The penalty is tiny though. We used to owe huge amounts 20-50k and the penalty was a joke. Now our employer lets us pick how much extra to withhold over the supplemental rate so we do that.
You should either elect for extra withholding, remove and exemptions, or worst case you could do estimated taxes to avoid the small penalty.
The supplemental rate jumps up to 37% once you make more than 1M for the year too, which limits the amount of error for W2 employees making variable income and large bonuses.