What the worksheet walks through
The 1084 is organized by tax schedule and entity type. A reviewer moving through it in order is really answering one question repeatedly: is this dollar recurring, and does the borrower have access to it.
| Source | Return and schedule | The judgment being made |
|---|---|---|
| Sole proprietorship | Form 1040, Schedule C | Net profit adjusted for non-cash items and non-recurring amounts |
| Farm | Form 1040, Schedule F | Same adjustments with farm-specific non-cash items |
| Rental property | Form 1040, Schedule E Part I | Whether rental income is stable and whether depreciation is added back correctly |
| Partnership or LLC | Form 1065 with Schedule K-1 | Ordinary income, guaranteed payments, and whether distributions support access |
| S corporation | Form 1120-S with Schedule K-1 | Ordinary income, wages already counted, and business liquidity |
| Corporation | Form 1120 | Whether corporate income can be used at all, and on what evidence |
| Interest, dividends, capital gains | Form 1040, Schedules B and D | Recurrence, and whether the asset producing it still exists |
The adjustments that create defects
Nearly every contested self-employed income calculation turns on one of these.
- Depreciation and depletion add-backs. Legitimate as non-cash items, and routinely added back from the wrong schedule or in the wrong year.
- Business use of home. Frequently added back without the underlying figure being supported on the return.
- Meals and entertainment. The deductible portion is not the full expense, and treating it as fully non-cash overstates income.
- Non-recurring income and losses. A one-time gain averaged across two years produces income that will not repeat. The same applies in reverse to a one-time loss that suppresses income the borrower actually earns.
- Business income without access. Ordinary income on a K-1 is not automatically available to the borrower. The file has to show why it is, and ownership percentage alone is not the answer.
- Business liquidity. Where the guide requires evidence that the business can withstand the withdrawal, the analysis has to exist in the file rather than in the reviewer’s head.
- Averaging period. One year against two years is a documented decision, not a preference. The decision and its basis both belong in the file.
- Declining income. A downward trend requires an explanation that the underwriter accepted for a stated reason.
Making the calculation reproducible
A self-employed income calculation is reperformable only if another qualified reviewer can start from the same inputs and land on the same number. That requires the file to preserve more than the result.
- The exact returns used, by entity, year and page, including every K-1 relied on.
- The business structure and the documented ownership percentage.
- Each add-back and deduction as a separate line with the schedule and line it came from.
- The averaging period and why it was chosen.
- The evidence for access to business income, where business income was used.
- The final monthly figure and the ratio it fed.
When a QC reviewer recalculates and lands on a different number, the finding should state both figures, the specific line that differs, and the guide section that governs it. That is a finding a lender can act on. “Income miscalculated” is not.
Common defects
| Condition | Typical severity | Why |
|---|---|---|
| Recalculated income no longer supports the approved ratios | Material | The loan would not have been approved as underwritten |
| Business income used with no access or liquidity evidence | Material | Income counted that the borrower may not be able to draw |
| Missing business return or K-1 for an entity used | Material | The calculation cannot be supported at all |
| Add-back error that does not change the decision | Low to moderate | Accuracy issue without a credit consequence |
| Calculation present but no worksheet or audit trail | Moderate | Not reperformable, which is itself the defect |
Where the transcripts come in
The 1084 is only as good as the returns underneath it. Tax transcripts obtained through the IRS Form 4506-C process are what tie those returns to what was actually filed. A clean worksheet built on a return the IRS has no record of is a worse outcome than an arithmetic error, and it is the pairing of the two controls that catches it.
To work the figures through, use the free self-employed income calculator. For the review cycle this sits inside, read the post-closing QC checklist.
Keep decisions human and evidence explicit.
Translate guidance into a review record that preserves what happened, who decided, and which source controlled.
Confirm requirements against current source material.
Requirements and vendor capabilities change. These sources were reviewed July 31, 2026. Confirm current source material, product scope, commercial terms, and your approved QC plan before changing a production process.
What mortgage teams usually ask.
What is Fannie Mae Form 1084?
It is the Cash Flow Analysis worksheet Fannie Mae publishes to help a lender calculate monthly qualifying income for a self-employed borrower from personal and business tax returns. It is a calculation aid, not a required form, and it does not override the Selling Guide.
Is using Form 1084 mandatory?
No. Fannie Mae does not require the worksheet itself. It requires a calculation that follows the Selling Guide. Many lenders adopt the 1084 because it makes the calculation legible to an auditor, which is a good reason to use it.
What is the difference between Form 1084 and Fannie Mae's Income Calculator?
Form 1084 is a worksheet the lender completes. The Income Calculator is a separate Fannie Mae tool that performs the calculation from uploaded returns. They are different products with different outputs, and the representation and warranty treatment attached to the calculator is described in the Selling Guide rather than on the worksheet.
How many years of returns are required?
It depends on the business structure, the AUS recommendation, and the length of self-employment. One year of returns is permitted in defined circumstances and two years is the general expectation. Read the current self-employment income sections of the Selling Guide rather than applying a rule of thumb.