Income Tracker Main Screen

Income Tracker is a new program I'm developing for personal use, pretty much. But I will upload it to my website if people begin to demand it... It allows you to keep track of your income, and how much it is taxed. I really find this handy since I am a sole-proprietor. But, the design is simply, and the calculation functionality is solid. There are still a few more features to add.. but it's looking good!!

Thoughts?