If you had no income or expenses from your business for the entire year, it is not necessary to file a Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship) for that year. This is supported by the information that if your sole proprietorship business has no profit or loss during the full year, you do not need to file a Schedule C. However, it is recommended to consult the IRS guidelines or a tax professional to determine if you are required to file a Schedule C in your specific situation.
Sources:
Publication 1635 (2/2014)
Publication 334 (2023)
Publication 535 (2022)
FS-2020-16
Publication 583 (1/2021)
Publication 4128 (5/2020)