How Do Lenders Calculate Self-Employed Income for a Mortgage?

The short answer

For a regular Conventional, FHA or VA loan, the income a lender counts is not your sales, and it is not what lands in your bank account. It is the profit on your tax returns, adjusted with a few specific add-backs and subtractions, then averaged over time. That number is often lower than business owners expect, which is why it pays to run it before you start shopping for a home.

Step 1: Lenders start with your tax returns

Most programs ask for your two most recent years of signed personal federal tax returns with all schedules, and business returns if you own a partnership, S corporation or corporation. The starting point depends on how your business is set up:

• Sole owner or 1099 worker: the net profit on Schedule C (line 31).
• S corporation or partnership owner: the W-2 wages your company pays you, plus your share of the business income shown on your K-1, adjusted by the business's own add-backs.
• Partnerships: guaranteed payments to you count as well.

Lenders follow written worksheets for this, such as Fannie Mae's cash flow analysis (Form 1084), so the same file should produce the same number from one underwriter to the next.

Step 2: Expenses that get added back

Some deductions lower your taxes without being cash that left your business that year. Lenders add these back to your income:

• Depreciation (Schedule C line 13), because it spreads the cost of equipment or vehicles over years.
• Depletion (line 12), mostly for oil, gas and timber businesses.
• Business use of your home (line 30), since you pay that housing cost either way.
• Amortization and casualty losses.
• The depreciation part of the standard mileage rate, if you deducted business miles: 33 cents a mile for 2025 and 30 cents a mile for 2024, under the IRS rates.

A few items work the other way and get subtracted, such as meals that were not deductible, and for business owners, business loans that come due within a year.

Step 3: The two-year rule and your income trend

Lenders want to see that your income is stable and likely to continue, so they look at the direction it is moving:

• Steady or rising: they usually add the two years together and divide by 24 months.
• Falling: they usually use the lower, most recent year divided by 12, and ask why it dropped. A large drop, often more than about 20%, may need a year-to-date profit and loss statement and a written explanation, and the income may not be usable until it stabilizes.

Can you qualify with only one year of returns? Sometimes. For conventional loans, Fannie Mae allows one year of personal and business returns when the business has existed for at least five years and you have owned at least 25% of it for five years, along with other conditions. FHA may accept one year of self-employment when you worked in the same line of work for the two years before. Read more about qualifying with one year of tax returns.

A worked example

A sole owner shows $72,000 of profit on her 2025 Schedule C and $65,000 on 2024. Here is how a lender would usually adjust it:

Her income went up about 12%, so a lender averages the two years: ($83,640 + $74,900) ÷ 24 = about $6,606 a month. Without the add-backs, she might have assumed only $5,708 a month, which is roughly $900 a month less buying power.

Example 2: an S corporation owner

A business owner owns 100% of an S corporation. The company pays her a $60,000 W-2 salary each year, and her K-1 shows $40,000 of ordinary business income for 2025 and $36,000 for 2024. The company's own return shows depreciation, and it has a $4,000 business loan due within the year.

Her income held steady, so the lender averages: ($106,000 + $105,000) ÷ 24 = about $8,792 a month. There is one catch. The K-1 part only counts if the business actually paid it out to her or has enough cash to support it. If the lender cannot document that, it may count only her W-2 salary, which is $5,000 a month. That gap is why S corporation owners should keep clean business bank statements and talk to their CPA about distributions before applying.

If she owned 50% instead, the lender would count her full W-2 salary but only half of the K-1 income and half of the business add-backs and subtractions.

Example 3: when income goes down

A contractor's adjusted income was $90,000 in 2024 and $67,500 in 2025, a 25% drop. The two-year average would be about $6,563 a month, but because income fell, a lender usually counts only the lower year: $67,500 ÷ 12 = $5,625 a month, almost $940 less.

Because the drop is larger than about 20%, expect more questions. A lender may ask for a year-to-date profit and loss statement for 2026, recent business bank statements and a short letter explaining what happened, such as a one-time project that ended or time off for a family reason. If this year's numbers show the business has recovered, some lenders can work with it. If the decline is still going, the income may not count until it levels off, and waiting a few months can be the smarter move.

How each type of loan treats self-employed income

These are typical guidelines. Each lender can add its own rules, and your loan's automated underwriting findings can change what is required.

Should you write off less to qualify for more?

Every $10,000 of deductions you skip adds about $833 a month to the income a lender can count, which can raise the price you qualify for by tens of thousands of dollars. It also raises your tax bill. Whether that trade makes sense depends on how soon you want to buy and how much tax it costs, so plan it with your tax professional a year or more before you apply, not at the last minute. Never change or amend returns just to qualify, and never overstate income. Lenders verify returns directly with the IRS.

Documents to gather before you apply

• Your last two years of personal federal tax returns, signed, with every schedule.
• Your last two years of business returns (Form 1120-S or 1065) and K-1s, if you own an S corporation or partnership.
• A year-to-date profit and loss statement, especially if it is later in the year or your income changed.
• Two to three months of personal and business bank statements.
• Proof the business exists, such as a business license, articles of organization or a CPA letter.
• Your W-2s from your own company, if you pay yourself a salary.
• For bank statement loans: 12 or 24 months of statements for the account you will use.

When tax returns don't tell the whole story

Write-offs that save taxes also shrink the income a lender can count. If your returns show much less than your business actually earns, a bank statement loan may count your deposits instead, usually after an expense ratio (often 50% for business accounts). These loans can help, but they usually need a larger down payment and carry a higher rate than Conventional, FHA or VA loans, so it is worth comparing both. How bank statement mortgages work.

Mistakes that cost self-employed buyers

• Missing add-backs. In Sarah's experience reviewing files, a common reason a self-employed buyer is told they qualify for less is that depreciation, home office or mileage was never added back.
• Filing late or amending at the last minute. Lenders need filed, signed returns, and changes during the loan can delay closing.
• Counting K-1 income the business can't pay out. For S-corp and partnership owners, lenders usually need to see distributions or enough cash in the business to support the income.
• Starting with a pre-approval that never looked at the returns. A number based only on what you said can fall apart in underwriting.