What kind of 1099 are you waiting for? If you are self-employed, you are required to report all of your income and expenses from your own accurate records, regardless of whether your clients or customers give you 1099-NEC forms. You can go ahead and file without, including the form as long as you include the income. If the IRS sends a letter asking for more information, you can send them a copy of your PNL, or other records from your business showing that you already included the income.
If you are waiting for something else, like a 1099B or a 1099R, then you should probably wait.
