I agree about the IRS. That's where you can really lose money of your own. Many people give them interest free loans of thousands of dollars for months - that's money that you could be earning interest on. My ideal outcome, which I never accomplish, is to write the IRS a check for less than $100 in April. A large refund isn't a windfall, it's a poor way to save. Since retiring, my finances have become more consistent, so hopefully I can more easily hit my April target.