You’ll need all your business records from the year to report income and expenses. These records will help calculate your tax liability and your net income (or loss) after any credits or deductions.
For examples of business records, see our Tax Guide page on Taxes for the Self-Employed.
In addition to filing a tax return, make sure you also pay your quarterly estimated taxes to avoid underpaying and being given a large tax bill at the end of the year. Generally, you must make quarterly estimated tax payments if you expect to owe tax of $1,000 or more when you file your taxes.