How Is Bank Statement Mortgage Income Calculated?

A bank statement mortgage qualifies you on your business deposits instead of your tax return: a lender averages 12 or 24 months of deposits and counts roughly half as qualifying income (a CPA letter can raise that). It's built for owners whose legitimate write-offs make their taxable income look small.

Your tax return says $90K. Your bank says $310K.

Your HVAC company did $1.4M in revenue last year. After payroll, fuel, parts, the truck fleet, and a Section 179 write-off on the new compressor, your Schedule C shows $90K in net profit — good tax strategy, and exactly what a conventional lender used to tell you that you can't afford the four-bedroom your family has outgrown.

Here's what that file missed: your business checking averaged about $310K in deposits across the year. A bank statement mortgage reads that number. Conventional underwriting starts from tax returns and qualifies you on net income after every deduction — the CFPB's Ability-to-Repay rule lets lenders verify income through alternative documentation, which is the lane non-QM programs use. For a W-2 employee, "income" and "what the lender counts" match. For a business owner, they're often off by 2–3×.

How the calculation actually works

1. Pick the period. Programs use 12 or 24 months of business bank statements. The 24-month look-back smooths out seasonal swings.
2. Average the deposits. Total qualifying deposits ÷ number of months = average monthly deposits.
3. Apply an expense factor. Because deposits are revenue, not profit, the lender discounts them — commonly counting about 50% as qualifying income. At $310K/year in deposits ($25,800/mo), a 50% factor lands near $12,900/mo — a very different conversation than $90K/year on a return.

Those are illustrative figures to show the shape of the math, not an offer; the exact look-back and expense factor vary by lender and are confirmed per file.

When a CPA letter raises your number

The 50% factor is a default proxy, not a verdict. If your business genuinely runs leaner, a CPA letter documenting your actual expense ratio can override it — a lower documented ratio means more of your deposits count. For asset-light operators (consultants, agencies, many service businesses), this one document can move qualifying income materially.

Business vs. personal statements

Most programs use business statements. Some accept personal statements and count the full deposit amount with no expense-factor haircut — but only when business income genuinely flows through that account. Commingled accounts may require both.

What you'll need to start

You don't need tax returns to get an income picture — just 12 or 24 months of business bank statements, a list of every account your business deposits into, government ID, and optionally a CPA letter on your expense ratio.

How this works at Sunrise

You don't have to pick the program yourself. Our loan matcher applies your profile to program rules and proposes the best-fit path — bank statement, 1099, or another — with no tax returns and no hard credit pull to start; a licensed mortgage professional reviews before anything formal moves. If you run a service business underwritten on a number that doesn't reflect how you earn, the home services owner path shows how files like yours come together.