Most freelancers approaching a mortgage application assume the income question is simple: here's what I made, here's my bank statement, let's talk. The reality is that lenders apply a specific, multi-step formula to self-employed income — and by the time they're done, the qualifying figure is often significantly lower than what you'd expect.

Understanding that formula is not just useful — it's essential. Because you can't improve a number you don't know how it's calculated.

It starts with what lenders don't use

Before the formula, it helps to be clear about what lenders are not looking at when they assess a freelance income:

What lenders use is the net profit figure from your Schedule C — the IRS form where self-employed income and expenses are reported. And then they adjust it further.

The formula, step by step

The following is the standard approach used by Fannie Mae and Freddie Mac guidelines — which govern the vast majority of conventional mortgages in the US. Individual lenders have some discretion, but most follow this framework closely.

01
Starting point
Schedule C net profit
Line 31 on your Schedule C. This is your gross income minus all claimed business deductions. It's the foundation everything else builds on — and it's already smaller than your revenue.
baseline
02
Add back
Depreciation
Depreciation is a non-cash expense — it reduces your reported income but doesn't represent money leaving your account. Lenders add it back. This is the one deduction that works in your favour.
+ adds back
03
Add back (if applicable)
Home office deduction — property owners only
If you own the home you use as an office, the deduction is added back. If you rent, it stays as a deduction. This asymmetry catches many people off guard.
sometimes +
04
Add back (if applicable)
Business use of vehicle (actual expense method)
If you claimed vehicle depreciation under the actual expense method (not standard mileage), the depreciation portion is added back. Standard mileage deductions are not added back.
sometimes +
05
Subtract
50% of self-employment tax (Schedule SE)
Self-employed workers pay both the employer and employee portions of Social Security and Medicare — 15.3% of net earnings. The IRS lets you deduct half on your 1040. Lenders subtract this half from your qualifying income, reducing the final number.
− reduces
06
Average
Divide across 24 months
The result of steps 1–5 is calculated for each of your two most recent tax years, then averaged. If income declined significantly year-over-year, this average works against you — or lenders may simply use the lower year.
÷ 24 months

The final figure — your adjusted net self-employment income divided by 24 — is your monthly qualifying income. This is the number that determines your maximum mortgage payment.

A worked example

Let's take a freelance designer earning $95,000 in gross revenue, with moderate business expenses and a typical self-employment tax burden.

Worked example — freelance designer, Year 1 $95,000 gross revenue
Schedule C net profit (gross revenue minus deductions) $67,400
Add back: depreciation (equipment) + $2,800
Add back: home office (renting — not added back) $0
Subtotal before SE tax adjustment $70,200
Schedule SE tax (15.3% × 92.35% of net profit) $9,521
Subtract: 50% of SE tax − $4,760
Annual qualifying income (Year 1) $65,440

Now run the same calculation for Year 2. Say this designer had a slower year — $82,000 gross, resulting in a qualifying income of $54,200. The lender averages both years:

Two-year average Used for monthly qualifying income
Year 1 qualifying income $65,440
Year 2 qualifying income $54,200
Two-year average $59,820
Monthly qualifying income (÷ 12) $4,985

From $95,000 in gross revenue in the most recent year to a monthly qualifying income of $4,985. That's not a distortion — it's the math. Deductions, the SE tax adjustment, and the two-year average all pull in the same direction.

The declining income trap

If Year 2 is more than 20% lower than Year 1, most lenders won't average the two years. They'll either use the lower year only — or decline the application entirely on the grounds that income is trending downward.

This means a single slow year can do significant damage to a mortgage application, even if the following year recovers strongly. The recovery won't show up in the calculation until it's in a filed return.

Why two years — and what happens at the edges

The two-year requirement exists because lenders need evidence that self-employment income is established, not a recent spike. One year of strong freelance income could be luck or an unusual project. Two years suggests a real, sustainable business.

At the edges of the rule, there's some flexibility — but less than people hope:

What this means compared to a W-2 employee

The gap between how self-employed and salaried income is assessed is larger than most people realise — and it's worth making explicit.

W-2 employee
$95,000
Gross salary from W-2 is used directly. Divide by 12. Done. No deduction adjustments, no SE tax subtraction, no two-year averaging requirement.
Self-employed (same revenue)
$59,820
After Schedule C deductions, depreciation add-backs, SE tax adjustment, and two-year averaging, qualifying income lands here. A $35,180 difference — with the same underlying revenue.

This isn't unfair treatment — the salaried employee has no equivalent deductions or variable income pattern. But it does mean that a freelancer earning the same gross revenue as a salaried peer will nearly always qualify for a significantly smaller mortgage.

How lenders vary — and why it matters

The framework above is standard, but lenders have discretion. The differences can be meaningful.

Lender type Approach to SE income Flexibility
Big banks / retail lenders Strict adherence to Fannie/Freddie guidelines. Two years required, averaging applied, limited exceptions. Low
Credit unions Often more relationship-based. May consider context more generously, especially for long-term members. Moderate
Portfolio lenders Keep loans on their own books — not bound by Fannie/Freddie guidelines. Can set their own income calculation rules. Higher
Bank statement lenders Use 12–24 months of bank deposits instead of tax returns. Sidesteps the deduction problem entirely — but at a rate premium. Highest

The practical implication: if a big bank declines you or offers a loan significantly smaller than you expected, that's not necessarily the final word. A mortgage broker who specialises in self-employed borrowers can match your profile to lenders who are likely to view it more favourably.

What you can actually do with this

The formula is largely fixed. But the inputs aren't — at least not over a 12–24 month horizon.

Where do you stand right now?

The free readiness assessment factors in income history, consistency, and write-offs to give you an honest verdict before you talk to a lender.

Take the assessment →