> why would you wait until April 15 to ask for your money back if your biggest concern is not giving them an interest free loan? It's not always possible to fi

> why would you wait until April 15 to ask for your money back if your biggest concern is not giving them an interest free loan? It's not always possible to file accurately that early. A number of investment related tax documents don't come until March 15th at the earliest. Then you probably need to wait for your accountant to prepare everything, you review everything and finally you officially file it. For me personally this usually happens near the end of March. Realistically it can't be any earlier. Also, if you're self employed chances are you're paying quarterly estimated taxes to avoid penalties. You're giving them money as early as a few months into the tax year. You also need to make sure you don't underpay or you can get penalties and you also owe interest. You either give the IRS an interest free loan by overpaying throughout the year or risk losing money.