<prompt> Human: Wondering if this is a smart idea. Im no expert on finances but I am diligent with my money. Thinking about doing this for the 2015 tax year. Please advise.  <response>: Do you even qualify? Line 7 of the W4 outlines the conditions under which you can claim exemption from withholding.If you cant claim exempt, it is not a good idea to have too little withheld as that might open you up to the underwithholding penalty 