Customer Web Based Tax service

I want to create a smiler Web based, customer log in and create or update personal and tax info online yearly. with notification to us and to customers of process stage. I am looking to create a site just like [login to view URL] or [login to view URL] I am a single person, just created my own business. and i am looking for some one who is very export in creating a data based of customer information who would log in to their account every year and update their info with their tax year income and bank reporting. If you might be an export and very good on such data based developing who can help to start such work with in my budget.