Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Payroll question
That $200 extra that your employer withheld may already have been sent on to the IRS. Depending on the size of the employer, withholdings from payroll taxes (plus employer's share of Social Security and Medicare taxes) might be deposited in the US Treasury within days of being withheld. So, asking the employer to reimburse you, "out of petty cash" so to speak, might not work at all.  As JoeTaxpayer says, you could ask that $200 less be withheld as income tax from your pay for the next pay period (is your Federal income tax withholding at least $200 per pay period?), and one way of "forcing" the employer to withhold less is to file a  new W-4 form with Human Resources/Payroll, increasing the number of  exemptions to more than you are entitled to, and then filing a new W-4 changing your exemptions back to what they are right now once when you have had $200 less withheld. But be careful. Claims for more exemptions than you are entitled to can be problematic, and the IRS might come looking if you suddenly "discover" several extra children for whom you are entitled to claim exemptions.