Where Do You Put the IP PIN on Your Tax Return?

On a paper return, your IP PIN goes in the small box labeled “Identity Protection PIN” to the right of your signature line at the bottom of Form 1040. If you e-file, your tax software prompts you for the six-digit code during the review or filing step and transmits it to the IRS for you. That is where to put the IP PIN on your tax return, and the rules below cover spouses, dependents, and the forms the PIN does and doesn’t belong on.¹

Exact Placement on a Paper Form 1040

Look at the very bottom of Form 1040, where you sign and date the return. To the right of “Your signature” and “Occupation,” there is a small box labeled “Identity Protection PIN.” Write your six-digit code in that box.²

On a joint return, a second IP PIN box sits to the right of “Spouse’s signature and occupation.” Each spouse writes their own code in their own box. If only one spouse has been assigned an IP PIN, only that spouse’s box needs to be filled in; the other stays blank and the return processes normally.¹

One detail catches people off guard. On a paper Form 1040, only the primary taxpayer’s and spouse’s IP PINs are required. A dependent’s IP PIN is not written anywhere on the paper return, even if that dependent has one.¹

If you leave the box blank on a paper return when a PIN has been assigned to you, the IRS does not reject the return. It routes into manual identity verification, and refunds can be delayed by several weeks or longer.³

Where to Enter It When E-Filing

Tax software handles the technical transmission of your IP PIN, so you won’t see a form image with a box on it. The software prompts you to type the six-digit number, usually near the end of the preparation flow, in a section labeled something like “Review,” “Filing,” “E-file,” or “Identity Verification.” If the field isn’t obvious, search inside the software for “Identity Protection PIN” or “IP PIN,” or ask the provider’s help desk.⁴

Electronic filing has a stricter rule than paper. Every person listed on an e-filed return who has an IP PIN must have that PIN entered, dependents included. A dependent’s IP PIN belongs on the Form 1040 series return and, where they apply, on Form 2441 (Child and Dependent Care Expenses) and Schedule EIC (Earned Income Credit). Omitting a dependent’s IP PIN causes the return to be rejected.⁴

Using a paid preparer or a volunteer preparer doesn’t change any of this. You give them your IP PIN so they can enter it before transmitting. A dependent who has an IP PIN and is being claimed on someone else’s return must share the PIN with the person claiming them.⁴

Joint Returns and Dependents at a Glance

The paper-versus-electronic split is the single most common reason a return with children gets an unexpected e-file rejection. To keep the rule straight:

Paper Form 1040: enter the primary taxpayer’s IP PIN, and the spouse’s if the spouse has one. Do not enter dependent IP PINs.
E-filed Form 1040: enter every IP PIN for every person on the return, including dependents, on the 1040 and on Form 2441 or Schedule EIC where those forms apply.

Each person only ever uses their own PIN. There is no shared or family PIN.

Which Returns Use the IP PIN

The IP PIN is a federal item, and it lives on the Form 1040 family only: Form 1040, 1040-SR, 1040-NR, 1040-PR, and 1040-SS. Do not enter it on Form 4868 (the automatic extension request), and do not enter it on your state tax return. Some states run their own identity protection programs, but those are separate from the IRS-issued PIN.⁴

Amended returns and late prior-year returns do need the PIN. The rule that trips people up: you use the IP PIN issued for the calendar year in which you are filing, not the year the return covers. Filing a late 2023 return in 2026 means using your 2026 IP PIN.¹

A new six-digit code is generated for you every year. Last year’s number never works on this year’s return, and reusing an expired PIN is one of the most common causes of e-file rejections.⁴

If Your E-File Is Rejected on the IP PIN

When an e-filed return bounces back on an IP PIN issue, the rejection carries a specific code. The common ones:

IND-180-01: the primary taxpayer’s IP PIN doesn’t match IRS records.
IND-181-01: no valid IP PIN was entered for the primary taxpayer.
IND-182-01: the spouse’s IP PIN doesn’t match IRS records.
IND-183-01: no valid IP PIN was entered for the spouse.⁵

First check whether you are using this year’s PIN and not last year’s. Then check the digits, because a single transposition triggers a mismatch. You can pull your current PIN by logging into your IRS online account and opening the Profile tab; the current IP PIN is displayed there.³

If the electronic filing still won’t go through, the fallback is to print the return and mail it. Write the PIN in the signature-area box if you have it; including it on paper avoids the manual verification delay that a missing PIN triggers.³

Keep the PIN itself private. The IRS will never call, email, or text asking for it, and it is not accepted as proof of identity when you contact the IRS by phone or in person; it only authenticates a tax return.⁴

1
Internal Revenue Service. Get an Identity Protection PIN
2
Internal Revenue Service. Understanding Your CP01A Notice
3
Internal Revenue Service. Retrieve Your Identity Protection PIN
4
Internal Revenue Service. Frequently Asked Questions About the Identity Protection Personal Identification Number
5
Internal Revenue Service. Identity Protection PIN Presentation