How to Calculate Qualifying Income for a Self-Employed Borrower

Quick answer: To calculate qualifying income for a self-employed borrower, you average the borrower's net business income over the most recent two years of tax returns, add back non-cash deductions like depreciation, then divide by 24 to reach a monthly figure. Borrowers who own 25% or more of a business are considered self-employed, generally need a two-year history, and may have separate W-2 wages that must be counted on top of business income.

What makes a borrower "self-employed"?

A borrower is treated as self-employed when they have a 25% or greater ownership interest in a business. Below 25%, the income is usually handled as ordinary wage income; at or above 25%, the file moves into self-employed underwriting, which means business tax returns, a two-year history test, and a cash-flow analysis rather than a simple paystub calculation.

This matters because the same person can have two kinds of income at once. For example, an S-corporation owner who pays themselves a W-2 salary: one borrower, two income streams, two different calculations. (More on that below.)

How many years of history do you need?

The standard requirement is two years of personal, and usually business, federal tax returns. A shorter history (roughly 12–24 months) can sometimes be used when the borrower has a documented record of at least two years in the same line of work and other strong compensating factors, but the conservative default is a full two-year history.

If the business has less than two years of history, the income is typically excluded entirely, even when it's profitable. This is one of the most common surprises for newer originators.

Which documents do you need?

The documents depend on how the business is structured and taxed:

• Sole proprietor / single-member LLC (disregarded entity). Files a Schedule C on the personal return. A single-member LLC marked "disregarded entity" flows through to Schedule C and is treated like a sole proprietor, not a separate company.
• Partnership / multi-member LLC. Files Form 1065 and issues a Schedule K-1 to each owner.
• S-corporation. Files Form 1120-S and issues a Schedule K-1, and also pays the owner W-2 wages.
• C-corporation. Files Form 1120. Corporate profit generally stays in the corporation, so usually only the owner's W-2 wages and any documented dividends qualify.

A good rule: don't assume the entity type from the LLC label. An LLC can be taxed four different ways, so confirm which return was actually filed before you route the calculation.

How the calculation actually works

For most self-employed income, the core method is a two-year average with non-cash add-backs:

• Start with the business's net income for each of the two most recent years.
• Add back non-cash deductions — depreciation, depletion, amortization, and similar paper expenses that reduced taxable income but didn't cost the borrower cash.
• Average the two adjusted years.
• Divide by 24 to get qualifying monthly income.

The add-backs matter enormously. A business can show a small profit, or even a loss, on paper while generating strong real cash flow, because depreciation alone can run into six figures. Missing the add-backs understates qualifying income and can sink an approvable file.

Worked example: S-corp owner (illustrative figures)

A borrower owns 100% of an S-corp. The 1120-S shows ordinary business income of −$40,000 (a paper loss) but $200,000 in depreciation.

• Adjusted business income = −40,000 + 200,000 = $160,000
• Monthly = 160,000 ÷ 12 = $13,333/month of qualifying self-employment income

Without the depreciation add-back, this borrower looks like they lose money. With it, they qualify comfortably.

The S-corp owner's two income streams (don't miss the second one)

S-corporation owners are the case originators get wrong most often, because there are two separate pots of money:

• Stream 1: business income (K-1). The owner's share of ordinary business income from the K-1, plus add-backs. This is the self-employment portion.
• Stream 2: W-2 officer wages. The salary the S-corp pays the owner. The corporation already deducted this salary before arriving at the K-1 number, so it's genuinely separate income. Adding it does not double-count.

Because the salary is already removed from the business profit, you count both. But Stream 2 has a catch: you need recent paystubs, not just last year's W-2, to confirm the owner is still paying themselves at the same rate. Owners can quietly cut or stop their own salary, so paystubs verify the wage income is ongoing. If the paystubs aren't in the file, the right move is to qualify the K-1 income now and add a condition requesting the W-2 and paystubs to count the wage portion.

Partnerships and guaranteed payments

For partnerships (Form 1065 / K-1), the owner's qualifying income includes their share of ordinary business income, and guaranteed payments to the partner (K-1, Box 4), which function like compensation and are frequently overlooked. If you're only reading Box 1, you may be understating a partner's income.

What happens when income is declining?

A year-over-year decline is a yellow flag, not an automatic decline-the-loan. The key questions are how steep the drop is, how long the business has operated, and whether it's a one-year blip or a sustained trend.

• A small dip on a long-established business with healthy income may still be usable, often by qualifying on the lower (most recent) year rather than the two-year average.
• A steep or accelerating decline, or a decline on a young business, may make the income unusable and requires a written explanation.

The principle: the more severe the decline and the shorter the track record, the more conservative the income figure should be.

Common mistakes to avoid

• Forgetting the depreciation add-back and understating income on an otherwise strong file.
• Treating an S-corp owner's W-2 and K-1 as the same income, or counting only one of the two.
• Assuming the LLC tax treatment instead of checking which return was filed.
• Missing guaranteed payments on partnership K-1s.
• Using a two-year average on clearly declining income, which can overstate what the borrower actually earns now.
• Counting a business with under two years of history, which generally isn't allowed.

FAQ

What counts as self-employed for a mortgage? A borrower with a 25% or greater ownership interest in a business is considered self-employed and must document income with business tax returns rather than paystubs alone.

How many years of tax returns do self-employed borrowers need? Generally two years of personal and business federal tax returns. A 12–24 month history may be acceptable with a documented two-year record in the same field and strong compensating factors.

Do you add back depreciation when calculating self-employed income? Yes. Depreciation and other non-cash deductions are added back to net business income because they reduced taxable income without reducing the borrower's actual cash flow.

Can an S-corp owner count both their salary and business income? Yes. W-2 officer wages and K-1 business income are separate because the salary was deducted before the business profit was calculated. Recent paystubs are needed to confirm the salary is ongoing.

Can you use self-employed income from a business less than two years old? Usually no. Income from a business with under two years of history is typically excluded, even if profitable, unless the borrower can document a longer record in the same line of work.

This guide reflects how self-employed income is commonly documented and calculated under Fannie Mae's Selling Guide (B3-3.2). Agency rules, investor overlays, and automated underwriting findings change over time and vary by scenario, so always verify against current guidelines and your AUS findings for the specific file.

How Autyn handles this automatically

Autyn's income engine reads the borrower's documents, routes each business to the correct calculation by entity type, applies the right add-backs, and flags the two-income-stream and declining-income cases that originators miss — with a source and confidence score on every number, so a loan officer can see exactly where each figure came from. It's the difference between an income figure you hope is right and one you can defend.

Free front-end analysis on every file. See how it works →