<prompt> Human: I have a job that pays 80kyear and I claim zero on w4 so that Im guaranteed a tax refund, and I like it that way. I recently got a second full time job that also pays 80k and claimed zero on that w4 as well. With my increase in income, should I be setting aside extra for tax time? Or will claiming zero on both w4s guarantee me a refund?  <response>: Use the IRS withholding calculator, or at least the two-earnersmultiple-jobs worksheet on the W-4.Youll still probably get a refund with 00 Id guess, but theres no guarantee. The normal withholding tables arent set up for multiple jobs very well 