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To successfully e-file your 2025 tax return in 2026, the Internal Revenue Service (IRS) requires a specific digital handshake to verify your identity: your prior year's Adjusted Gross Income (AGI). Without this exact number from your 2024 return, your electronic submission will be rejected by the IRS processing systems, forcing you to correct it or file by mail. This guide explains exactly how to locate this figure to ensure your digital signature is accepted immediately.
Why the IRS Demands Your Prior AGI
The AGI serves as a security verification step for electronic filing. Since you are not physically signing a paper document, the IRS uses your AGI from the previous tax year (in this case, the return filed in 2025 for the 2024 tax year) as a form of authentication. It confirms that the person filing the return is indeed the same taxpayer who filed the previous year.
Method 1: Locating AGI on Your Tax Documents
If you have a digital PDF or a physical copy of your tax return from last year, finding the number is straightforward. The IRS has standardized the location of this figure on the primary tax form.
- Retrieve Form 1040: Locate your copy of the Form 1040 (U.S. Individual Income Tax Return) that you filed in 2025.
- Scan for Line 11: On the standard Form 1040, scroll down to the section labeled 'Income'. Look specifically for Line 11.
- Verify the Description: This line should be labeled 'Subtract line 10 from line 9. This is your adjusted gross income.'
- Note the Exact Amount: Write down the exact dollar amount. Do not round up or down; the IRS system requires the precise figure to validate your e-signature.
Method 2: Using the IRS Online Account
If you do not have a copy of your old return, you can retrieve the data directly from the IRS database using their digital tools.
- Access the IRS Portal: Navigate to the official IRS website and select 'Sign in to your Online Account'.
- Authenticate Identity: Log in using ID.me or your existing IRS credentials.
- Navigate to Tax Records: Once logged in, select the 'Tax Records' tab on the dashboard.
- Request a Transcript: Look for the option to 'Get Transcript'. You specifically need the Tax Return Transcript for the 2024 tax year.
- Locate 'Adjusted Gross Income': Open the transcript and look for the line item explicitly labeled 'Adjusted Gross Income'. This figure will match what is on Line 11 of your Form 1040.
Comparison of Retrieval Methods
| Method | Speed | Requirements | Best For |
|---|---|---|---|
| Physical/PDF Form 1040 | Instant | Access to last year's files | Organized record keepers |
| Tax Software (TurboTax/H&R Block) | Fast | Login credentials for software | Returning software users |
| IRS Online Account | Medium | ID.me verification | Users who lost their documents |
| IRS Mail Request | Slow (5-10 days) | Mailing address verification | Users without online access |
Special Scenarios for 2026 Filing
There are specific edge cases where your AGI might not be a standard number from a tax form. If you did not file a return last year, or if you are a first-time filer aged 16 or older, you should enter 0 (zero) as your prior year AGI. Similarly, if your 2024 return was not processed by early December 2025, the IRS system may not have the record yet; in this specific instance, entering 0 is often the recommended workaround to bypass the rejection error.
Frequently Asked Questions
What if I filed jointly last year but am filing separately this year?
You must still use the full AGI amount from the joint return filed last year. Do not split the amount in half; both spouses use the same total AGI from the joint Form 1040.
Does my AGI include unemployment benefits?
Yes. Adjusted Gross Income includes wages, dividends, capital gains, business income, retirement distributions, and unemployment compensation. It is the total income minus specific adjustments.
What happens if I enter the wrong AGI?
The IRS will reject your e-filed return, usually within 24 to 48 hours. You will receive a rejection code (often IND-031-04 or IND-032-04). You can then correct the AGI and resubmit the return electronically without penalty.
My Take: The Digital Filing Imperative
As we move further into a fully digital tax administration era, the reliance on the prior year's data for identity verification highlights the importance of digital hygiene. Saving a PDF of your Form 1040 to a secure cloud service immediately after filing is no longer just good practiceit is a critical step for ensuring a smooth process the following year. Relying on the IRS transcript service is a valid backup, but having your own immutable record ensures you aren't dependent on government portal uptime during peak filing season.