But experts urge taxpayers to be wise about the extra money. The higher paychecks could come at a cost down the road, because in some cases, the extra money is the result of not having enough taxes taken out of your paycheck, which means you could owe more when you prepare your 2018 return next year. In order to avoid that, it’s important to check your level of withholding with your employer soon after you see the higher checks roll in.