As an estimate, it will do the job. It’ll be wrong, but not horribly wrong, and if you had a windfall like that then planning based on a conservative estimate i

As an estimate, it will do the job. It’ll be wrong, but not horribly wrong, and if you had a windfall like that then planning based on a conservative estimate is a good idea. If you estimate your taxes high, then you get a pleasant surprise when your accountant actually crunches the numbers.