If you are self-employed, you can use QuickBooks Self-employed to track your income, expenses and mileage. This will also do a quarterly tax payment report for you.
You can also use a spreadsheet, if that is what works best for you. The most important thing is that you do what you can stick with and what will give you the numbers at the end of the year. If you set up a spreadsheet, I would suggest, looking at Schedule C and setting up the spreadsheet so that you can easily match your spreadsheet to the entries on Schedule C.
Remember as a self-employed individual to make quarterly estimated payments to cover your SE taxes of 15.3% and avoid penalties.
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