I switched to where they took off more off my pay. I ended up paying the year before and I was close to paying last year. I rather get a return from the gov. than get a bill. As for interest, if they give me back what's mine and made a little off the top, then good for them. Hopefully it'll go to some good. As for interest of my part, i woulda just spent it on some toys anyway... consider it patriotic charity..