Follow the steps to complete your IRS 3911 form online:

1. Click the ‘Get Form’ button to obtain the IRS 3911 form and open it in your preferred editor.
2. In Section I, enter your current name, taxpayer identification number (this could be your social security number or ITIN for individuals, or employer identification number for businesses), and your complete address including ZIP code.
3. If you filed a joint return, fill in the second line with your spouse’s name and taxpayer identification number, ensuring both parties' details are included.
4. Provide a phone number where you can be reached during business hours, including the area code.
5. If your address on the tax return differs from your current address, enter the old address exactly as it appeared on your tax return.
6. If applicable, fill in the name and address of a representative authorized to receive your refund check.
7. Indicate the type of return (individual or business), select the refund type, and specify the tax period.
8. Enter the refund amount and select the bank account type, then provide the bank routing number.
9. In Section II, check the boxes that apply to your refund situation: whether you didn’t receive it, or if it was lost, stolen, or destroyed.
10. For Section III, sign the form. If it was a joint return, include your spouse's signature.
11. After completing the form, review all entries for accuracy before saving your changes. You have the option to download, print, or share the form as required.

Complete your IRS 3911 form online to expedite your refund inquiry.