Hello, @sestradacpa.

In the 1099 wizard within QuickBooks Online (QBO), you can use the Employer Identification Number (EIN) as the tax identification number format for your business. It's important to ensure that the EIN is accurately entered to facilitate proper tax reporting. Additionally, QBO is designed to accept and process this format effectively, so rest assured that your 1099 forms will align with IRS requirements when the EIN is used as your tax identifier. Remember to verify your company name, email, address, and EIN before preparing your 1099s to confirm that all information corresponds with the details on file with the IRS.

You may consider reaching out the Customer support to guide you in filing 1099s so that it will not be rejected.

To ensure that your 1099 forms are filed correctly and not rejected, it's recommended to reach out to QuickBooks Online Customer Support for guidance. They can assist you in troubleshooting any issues you may encounter while filing your 1099 forms. 

Additionally, consider scanning this material for guidance on handling declined 1099 forms: Fix rejected 1099 forms.

 If you have further questions about your 1099s, you can comment below, and we'll respond to you as soon as possible.