Keep the sales/inventory spreadsheet for your records. The IRS does not need this information with your filed return, but you should always keep documentation that supports your return, should they inquire about income/deductions.
Rule of thumb: keep records for 3 years from the date you filed your original return or 2
years from the date you paid the tax, whichever is later.
https://www.irs.gov/businesses/small-businesses-self-employed/how-long-should-i-keep-records
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