Reject Code IND-507-01: Someone Already Used This Social Security Number

What the IRS says

The IRS page for IND-507-01 says: "A dependent's Social Security number (SSN) was already used on another accepted tax return for this tax year." Since 2024 returns, the IRS also says it "will accept e-filed Forms 1040, 1040-NR, and 1040-SS even if a dependent has already been claimed" when the primary taxpayer includes a valid IP PIN.

How to fix it

First check the number against the Social Security card. If a dependent's number is right, the IRS page for IND-507-01 says "you must include an Identity Protection PIN (IP PIN) to file electronically." If your own or your spouse's number is right, the IRS pages for IND-510-02 and IND-511-01 say to print and mail your return. If you cannot get an IP PIN, you can file on paper instead; the reject code index explains the grace period.

If your dependent filed their own return claiming themselves, the IRS page for IND-517-02 says "you will have to print and mail your return unless" you file without the dependent or the IRS has accepted the dependent's amended return.

If the code says the IRS already accepted a return under your number (R0000-902-01) and you filed it, do not file again. The IRS says: "If you have already filed a return for this tax year, do not file another original return. File an amended return if changes are needed."

If you did not file the other return

The IRS pages for these codes point to its identity theft guidance. For a dependent's number, start with identity theft and dependents. For your own or your spouse's number, the IRS page for IND-515-01 points to its identity theft guide.

What people mistake IND-507-01 for

Some people read IND-507-01 as the IRS deciding who may claim the dependent. The code means only that the number reached the IRS on another return first.