In the U.S., if you make less than $66,000 per year, you can use free tax preparation software (brands like H&R Block or Turbo Tax) via the IRS's Free File program:
https://www.irs.gov/filing/free-file-do-your-federal-taxes-for-free.
I think this is a dandy option.
We also have threads that can help those new to being self-employed figure out some bookkeeping basics to get those numbers all tallied up for tax filing:
Free bookkeeping software for small business and/or farm?year-end bookkeeping checklist and bookkeeping advice.
Are there free income tax options available in Canada, or other countries, too?