<prompt> Human: Not exactly the first I would have hoped to post here but I needed to get some helpadvice on my current situation. In July of last year I took on a new job. I had filled out all the forms like my W-4. It wasnt until recently when I was working on tax returns that I noticed something was amiss. After some digging I discovered that I had entered in the wrong numbers on my W-4 should have had 3 allowances instead of 2 because I did not mark myself as head of household. It is now rapidly approaching tax day and I wanted to hear if anyone knew what, if anything, I can do to resolve this. The difference with three allowances would mean a refund of over 300 more than I would get as of now.I know I would have to file an extension on my taxes with the IRS, and submit a new W-4 with my employer. Any helpadvice would be greatly appreciated.Cheers!  <response>: Im not sure I understand the question, but if you are worried a mistake on the W4 is preventing you from getting as much money back on taxes, you are thinking about it incorrectly. You pay the same dollar amount each year on taxes. Balancing the allowances too high means your paychecks are larger but you owe at the end of the year, balancing them too small and your paycheck is smaller, but you get a bigger refund.It sounds like you inadvertantly balanced them exactly where they should be making your refund less. A bigger refund just means you gave the government an interest free loan for a year. 