Anonymous wrote:Ask your employer to withhold at the highest bracket for bonuses. That's what mine does.

That may not help if you have lots of investment income

Estimated payments are easy to do and come back as a return or roll over to the next year if you overpay.

Anonymous wrote:Why would you make quarterly payments when you can just withhold more by updating employer W4?

It’s not for your salary. It’s for business income, dividends, stuff like that.