Self-Employed? How a Lender Reads Your Income

Two self-employed borrowers each report $100,000 of profit and each claim a $20,000 deduction. One qualifies for a $372,315 mortgage and the other for $465,394. Nothing separates them except what the deduction was for. That $93,079 gap is the single most useful thing to understand about self-employed lending, and it follows from one rule: lenders start from your taxable net income, then add back only the deductions that never cost you cash.

Which figure does a lender use?

Not your revenue, and not what lands in your account. Fannie Mae is explicit that qualifying income comes from taxable net income rather than gross receipts, and that bank statements are generally not the primary income method for a conventional loan. The analysis runs through Form 1084, a cash-flow worksheet that walks your Schedule C, K-1 or corporate return line by line, and the lender must keep its written conclusions in the file. So the number that decides your mortgage is the one at the bottom of a tax return you filed to be as small as legally possible.

How is the two-year average calculated?

Both adjusted years are added together and divided by 24 months, not by 12 and then averaged. On Schedule C net profits of $85,000 and $92,000 that gives $177,000 over 24 months, or $7,375 a month and $88,500 a year. Notice what that does to a growing business: you earned $92,000 most recently but qualify on $88,500, because last year's lower figure is still carrying half the weight.

Which deductions come back and which do not?

Only the non-cash ones. Depreciation, depletion, amortisation and non-recurring casualty loss all reduced your taxable income without money leaving the business, so Form 1084 restores them to qualifying income. Rent, payroll, materials, insurance and every other real cash cost stay deducted, because that money genuinely went. This is where the $93,079 comes from. Take two identical businesses, each with $100,000 of profit before a $20,000 deduction. The one that spent $20,000 on materials qualifies on $6,667 a month. The one that claimed $20,000 of equipment depreciation qualifies on $8,333, because the whole deduction is added back. Same tax bill, same profit, same paperwork, and $20,000 a year of difference in the income a lender will use. The logic is defensible from the lender's side, since depreciation is an accounting entry rather than a payment, but the practical effect is that a capital-heavy business borrows more than a labour-heavy one on identical economics.

Maximum loan at 6.69% over 30 years, before property taxes and insurance. The DTI ceiling depends on how the file is underwritten rather than on you, which is covered in our guide to debt-to-income ratios.

Why does averaging never help?

Because it works one way. When income is rising, the average pulls you below what you currently earn. When income is falling, lenders do not average at all: they use the lower of the two years, and a meaningful decline needs a written explanation alongside strong year-to-date business performance. Run the same two numbers in both directions and the asymmetry is plain. Earning $85,000 then $92,000 qualifies at $7,375 a month. Earning $92,000 then $85,000 qualifies at $7,083, which is less than the average of its own two years. There is no version of this where the method flatters you, so plan on the conservative figure rather than the one you feel you earn.

What about company income rather than sole trader profit?

The rules tighten as the structure gets more corporate. Partnership or S corporation earnings count only where you own 25% or more, evidenced by a Schedule K-1, and only where the business has enough liquidity to support withdrawing them in practice. A C corporation is narrower again: your W-2 wages and dividends count and the corporate profit does not, however healthy it looks. A business showing a loss can contribute zero qualifying income, and in some cases the loss reduces the rest of your file. The further your structure sits from a sole proprietorship, the more of your business's earnings the guideline leaves on the far side of the wall, which is why two founders with identical economics can get very different answers depending on how they incorporated years earlier.

What can you do about it?

Three things, and the first has a deadline attached. Talk to a CPA who knows Form 1084 before you file, not after, because the return is the input and you cannot amend your way out of a filed position at underwriting. Second, expect two years of returns, since the method averages 24 months, and know that a shorter history moves your file from routine to exceptional. Third, run your qualifying figure rather than your revenue through the debt-to-income calculator and the affordability calculator, because entering revenue produces an answer that no lender will honour.

A note on the figures

The method and every rule here come from Fannie Mae Selling Guide B3-3.5-01 and the Form 1084 worksheet, checked on 10 August 2026. Every dollar figure was computed from that method rather than copied, and the calculation reproduces two independently published worked examples exactly. Loan sizes use 6.69% over 30 years and exclude property taxes, insurance and mortgage insurance, so treat them as ceilings rather than offers. Individual lenders apply overlays on top of the investor guideline, and other investors calculate differently, so your own loan officer's figure is the one that counts.