E-file Rejected F1040-516: SSN Already Used
F1040-516 means the primary taxpayer's Social Security number has already been used on an accepted return for that year. The fix is to verify the SSN for typos, check whether you already filed, and if it points to fraud, contact the IRS and paper-file.
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Symptoms
- •Your e-file is rejected with code F1040-516.
- •The message says your SSN has already been used to file.
- •You're certain you haven't filed yet but keep getting rejected.
What causes it
- ▸A typo in the Social Security number.
- ▸You (or someone with access to your account) already filed a return.
- ▸A dependent or another person used your SSN by mistake.
- ▸Identity theft, where someone filed fraudulently using your SSN.
How to fix it
1Double-check the SSN
- Compare the SSN on your return against your Social Security card, digit by digit.
- Fix any typo and re-submit the e-file.
- Confirm you didn't accidentally swap your SSN with a spouse's or dependent's.
2Check whether you already filed
- Review your TurboTax account and email for a prior acceptance confirmation.
- If a return was already accepted under your SSN, you don't need to file again.
- If you need to change something, file an amended return instead.
3Address possible identity theft and paper-file
- If the SSN is correct and you didn't file, your SSN may have been used fraudulently.
- Contact the IRS, review their identity-theft guidance at irs.gov, and consider filing Form 14039 (Identity Theft Affidavit).
- Print and mail your return, since you won't be able to e-file with a flagged SSN.
Still stuck?
If F1040-516 points to possible identity theft, time matters — contact the IRS promptly and follow their identity-theft process. Official TurboTax support at ttlc.intuit.com can help you print and mail your return, and you can ask here about the steps for paper-filing when e-file is blocked.
Frequently asked questions
Does this rejection always mean identity theft?＋
No. The most common causes are a typo or having already filed. Only after ruling those out should you treat it as possible fraud.
How do I report tax-related identity theft?＋
The IRS has a dedicated process, including Form 14039. Start at irs.gov for their official identity-theft guidance, and plan to paper-file your return.
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