How often can you change your info on your W4 form during the year?

Question

If you have changed yours before, how long did it take your job to process it or how long did it take to reflect on your paycheck?

Answer 1

It is illegal to falsify a W4.  You also risk penalties and interest if you under withhold on your income taxes.

That said if you have legitimate reasons to change your deductions and exemptions, you are allowed to change it as circumstances dictate. Depending on your company's accounting department, the change should be reflected in your next pay check.

Answer 2

You can change it however often you want.  However, it depends on your company's payroll department when it comes to how fast it processes.

Answer 3

That is up to your employer.