Bonsai has several helpful resources about tracking, managing, and paying your taxes. Most of these resources are only for the United States right now, but we're looking at adding support to other geographies soon.
Tax Overview
To learn more about freelance taxes our popular and free e-book, "Freelance Taxes: The Ultimate Guide", is a great place to start.
These articles may also help answer some of the questions you may have as a freelancer filing taxes for your 1099 income:
Tax Deductions
To learn more about tax deductions (write-offs):
Other Resources
We have a freelance tax calculator that should give you a high level idea of what type of taxes you'll need to save for and pay.
There are also several blog posts that provide an overview of key tax issues, like common deductions and how to pay your taxes:
IRS Guide For Self-Employed Taxpayers:
https://www.irs.gov/businesses/small-businesses-self-employed
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Legal Notice: Bonsai exists to help freelancers manage their business and make better business decisions. Bonsai does not provide tax, legal or accounting advice. This material and software has been prepared for informational purposes only. You should consult your own tax, legal and accounting advisors with regard to your personal tax situation and recommendations.