To calculate 1099 income for a mortgage, lenders add the net profit from your two most recent federal tax returns, divide by 24 to get a monthly figure, and then add back certain non-cash deductions such as depreciation. That monthly number is your qualifying income, and it drives everything else in the file: how much house you can afford, and whether your debt-to-income ratio clears the lender’s cap.
The Two-Year Average
Fannie Mae and Freddie Mac base self-employed qualifying income on the net profit reported on Line 31 of Schedule C, averaged across your two most recent tax years.1Internal Revenue Service. 2025 Schedule C (Form 1040)2Fannie Mae. B3-3.1-01, General Income Information The arithmetic is straightforward:
Say your Schedule C showed $72,000 in net profit one year and $84,000 the next. Add them together for $156,000, then divide by 24. Your qualifying income is $6,500 a month. That figure — not your gross 1099 receipts, not your bank deposits — is what the underwriter plugs into the debt-to-income calculation.
This averaging assumes your income is stable or trending up. It also assumes a full two-year self-employment history, which Fannie Mae generally requires to conclude that the income is likely to continue.3Fannie Mae. Underwriting Factors and Documentation for a Self-Employed Borrower
Add-Backs That Raise Your Qualifying Income
Schedule C net profit understates the cash you actually keep, because some deductions are paper losses rather than money that left your account. Fannie Mae requires underwriters to add several of these items back before finalizing your income:4Fannie Mae. Income or Loss Reported on IRS Form 1040, Schedule C
- Depreciation, the annual write-off for equipment, vehicles, and other business property.
- Amortization, the gradual write-off of intangibles such as patents or purchased goodwill.
- Depletion, the deduction for natural resources extracted from land you own.
- Business use of home, the portion of housing costs claimed on Schedule C, Line 30.
- Casualty losses, one-time losses from events like fire or storm damage.
The business-use-of-home add-back matters most to freelancers with a home office: you were paying that mortgage or rent regardless, so lenders count it as available cash.5Fannie Mae. Cash Flow Analysis (Form 1084)
Worked example: your Schedule C shows $60,000 in net profit, with $8,000 in depreciation and $4,000 for business use of home. The lender works with $72,000 for that year, not $60,000. Do the same to the prior year, then average.
When Averaging Doesn’t Apply
If your income is declining, the lender cannot average across the drop. Underwriting must use the current, lower figure and then decide whether any of the self-employment income can be counted at all.2Fannie Mae. B3-3.1-01, General Income Information Under FHA rules, a decline of more than 20 percent forces a downgrade to manual underwriting, and the lender must document that the income has since stabilized.6HUD.gov. Calculating Effective Income After a Reduction or Loss of Income
If you have been self-employed for 12 to 24 months rather than a full two years, your income can still be used when positive factors offset the shorter history, such as strong credit, substantial reserves, or prior experience in the same field.2Fannie Mae. B3-3.1-01, General Income Information With fewer than 12 months, conventional qualification is difficult and an alternative program is usually the better path.
What You’ll Need to Document the Number
Fannie Mae generally requires signed federal returns (or IRS transcripts) for the two most recent tax years, with all schedules attached.3Fannie Mae. Underwriting Factors and Documentation for a Self-Employed Borrower That means Form 1040 plus Schedule C.7Internal Revenue Service. About Form 1040, U.S. Individual Income Tax Return Your 1099-NEC forms corroborate the gross receipts side of the return, and most lenders also request a year-to-date Profit and Loss statement to confirm the business is still tracking with what your returns show.
The lender will pull IRS transcripts directly and compare them against the returns you provide; if numbers don’t match, the file stalls until you reconcile them. You can preview what they’ll see by ordering your own transcripts free of charge using Form 4506-T.8Internal Revenue Service. About Form 4506-T, Request for Transcript of Tax Return
Lenders also verify the business itself has been operating for at least two years. Acceptable proof includes an EIN confirmation letter from the IRS, a business license, articles of incorporation, or a partnership agreement, provided the document names the same business shown on your loan application.3Fannie Mae. Underwriting Factors and Documentation for a Self-Employed Borrower
How the Qualifying Income Feeds Into DTI
Your monthly qualifying income is only useful in relation to your monthly debts. For conventional loans run through Fannie Mae’s automated underwriting, the maximum total debt-to-income ratio is 50 percent. Manually underwritten loans cap at 36 percent, stretching to 45 percent with strong credit and reserves.9Fannie Mae. Debt-to-Income Ratios
The debt side includes the proposed housing payment (principal, interest, taxes, insurance, and any HOA fees) plus recurring obligations: car loans, student loans, credit card minimums, and any IRS installment agreement payments. Every legitimate add-back that raises your qualifying income lowers your ratio and expands what you can borrow.
When Your Tax Return Understates Your Actual Cash Flow
If aggressive but legitimate deductions leave your Schedule C net profit too low to qualify even after add-backs, a bank statement loan is worth considering. These non-QM products calculate income from 12 to 24 months of personal or business bank deposits, applying an expense factor rather than reading your return. They typically carry higher rates and larger down payment requirements because they sit outside Fannie Mae and Freddie Mac guidelines, and they come from portfolio lenders and non-QM specialists rather than government-backed channels.
Before you apply anywhere, run the calculation yourself. Pull your last two Schedule Cs, add Line 31 across both years, add back depreciation, amortization, depletion, business use of home, and any casualty losses, then divide by 24. That number is close to what the underwriter will land on, and knowing it in advance tells you whether the loan you want is realistic before a lender’s decision does.