IRS Form 5405, Repayment of the First-Time Homebuyer Credit is a document used to inform the Internal Revenue Service (IRS) that the home you bought and for which you claimed the credit is not your main home anymore. You can calculate the amount you need to repay with your tax return on this form as well. Find more details in the official filing instructions issued by the IRS.
The form - also known as the first-time homebuyer form - was issued by the IRS and last revised in November 2018. An up-to-date fillable Form 5405 is available for download below.