Adjust witholding?

[Skate1968]

I'll soon be doing a payroll for a little mom & pop corp -- 1 employee/owner, semi retired.

Looking at it now i'm realizing that it would benefit me if doubled up his witholdings. Am i able to bump up witholdings whenever i feel like it? Is there a reg preventing me from doing this? (If so i'll just have him pay more in quarterly estimates.)

thanks

[DaveO]

An employee can adjust withholding at any time

Just advise him of what you think he should do and have him complete a new W-4 to reflect the change.