Keep this new rule about differential wage payments and withholding in mind when you are figuring out your estimated tax payments.
According to the IRS, beginning in 2009:
Differential wage payments made to active members of the uniformed services are treated as wages and income tax must be withheld.
This new rule was part of the Heroes Earnings Assistance and Relief Tax Act of 2008.
In case you are unfamiliar with the term, “differential wage payment” means any payment which: