Startup Idea: All-in-one Tool for Self Employed Individuals

Startup idea to develop a comprehensive software tool for self-employed individuals. The platform should incorporate features like a tax estimator, earnings tracker, contacts lists, and payment records, essentially becoming an all-in-one resource.

I am self employed, so a software that could really help would be a tool for self employed people. Maybe with a built in tax estimator, a way to keep track of earnings, keep lists of contact information, payments. Basically one place that you can use for everything. I would pay for software like this gladly. I have, but most seem to be with multiple softwares. I want one that has everything in one.