Why would you want a large refund? You're letting the government overcharge you every week. Then they hold that money, without giving you a dime in interest, until time to file your taxes. Whereupon the burden of proof is upon you to prove the amount you overpaid. The amount of your refund could of been invested throughout the year earning you money. Ideally you should try to adjust your witholding to come out even. If you have extra money in your paycheck every week I'd be happy to hold on to it for you