Startup Idea: Mobile App for Contractors to Track Work Time and Payments

Startup idea to develop a mobile application with features that enable contractors or traveling workers to easily track the time spent on work, calculate pay based on hourly rates and taxes, monitor mileage, and transfer money between accounts. It would also allow clients to directly pay through the application.

I would like a app that is able to easily track time working for a contractors or other people who work on the road. It should allow you to input hourly pay; taxes; track miles driven. It should also be able to move money between accounts so these same workers could use the app to have customers pay.