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There are several ways to record your 2020 expenses, @destinysanders55.
If you're self-employed, you can use a Schedule C form to report your self-employed expenses. Also, your 2020 expenses can be downloaded from your online banking and/or attaching receipts.
I've added these articles as your reference:
I'd also recommend consulting an accountant for professional advice. They can share with you specific guides on how to manage them.
Please drop a comment if you have other concerns with doing your 2020 expenses. Anytime I can help you here in the Community. Take care!