Expense Factor Sets Income On A Bank Statement Second-home Loan — The Quick Read: A lender takes your average monthly deposits, applies a percentage haircut for assumed business costs, and counts only what’s left as qualifying income. That leftover number then drives your debt-to-income ratio, which drives how much home you can buy. Get the percentage wrong — too high for your actual business — and a second home that should qualify suddenly doesn’t.
Bank statement lending exists because traditional personal-income documentation often understate what a self-employed borrower actually earns. Deductions that help at tax time hurt at mortgage time. So instead of a tax return, the lender looks at what actually landed in your account and works backward from there. The expense factor is the mechanism that turns raw deposits into usable income.
What Exactly Is An Expense Factor?
The expense factor is a percentage a lender subtracts from your gross business deposits before counting the rest as income. It assumes some portion of every dollar that hits your account goes right back out to run the business — payroll, materials, rent, supplies — so the lender isn’t crediting you with income you never actually kept.
Across the wholesale programs Lendmire places files through, this typically shows up as a fixed ratio tied to your business type. It generally scales upward with employee count, and moves higher still for businesses that sell a physical product. Exact tiers vary by lender and program, so borrowers should confirm current figures with the underwriting guidelines in effect at the time of application. If your actual numbers look different, a CPA-supported ratio or a profit-and-loss method — capped at 80% — can substitute for the fixed tiers.
That last point matters. Underwriters don’t ask whether you own 100% of the company. They ask what type of business it is and how many people work there. A single-owner consulting shop and a six-employee product business get treated very differently, even if the owner is the same person on both files.
How Personal Accounts Get Treated Differently
Personal bank statements skip the expense factor entirely — unless business activity is clearly flowing through them. If a personal account shows no evidence of business expenses running through it, the underwriter counts the deposits without any haircut at all. But once business revenue and costs start moving through a personal account, the review switches to business-statement rules, expense factor included.
This is why commingled accounts slow files down. The underwriter has to trace what’s personal spending and what’s really business cash flow before deciding which set of rules applies. Keeping the two separate — a dedicated business account, a dedicated personal account — is the simplest way to avoid that review entirely.
One wrinkle that trips people up: money the borrower transfers from their own business account into their personal account counts at full value, not haircut a second time. The logic is straightforward — that money already went through the expense-ratio math once, on the business side. Running it through the ratio twice would double-count the deduction.
The Math, Step By Step
Qualifying income comes from eligible deposits divided by the number of statement months, after the expense ratio is applied. You put in twelve or twenty-four consecutive months of statements. Out comes a single average monthly income figure. That figure becomes the number DTI is built on.
Say a business owner’s statements show steady monthly deposits over a 12-month window, and the file uses an expense ratio reflecting a business that runs with a handful of employees. A majority share of those gross deposits count as usable income, with the remainder assumed to cover overhead. That net figure, divided across the 12 months, becomes the monthly income the lender plugs into the debt-to-income calculation.
Change the ratio and the qualifying income moves with it. A business misclassified as a five-employee service operation when it’s really a product business with a different headcount can carry the wrong ratio into underwriting — and that single percentage difference can be the gap between a file that clears the debt-to-income ceiling and one that doesn’t. This is exactly why some borrowers bring a CPA letter to the table: to argue for a ratio that better reflects how the business actually runs. Lendmire’s guide on setting the expense factor on a second home walks through how that conversation typically goes.
Why 12 Months Or 24 Months Matters
A shorter lookback window can help a business with recently rising income; a longer one smooths out a lumpy or seasonal year. The choice isn’t arbitrary — it’s a decision that changes the qualifying income figure before the expense factor is even applied.
The bank portfolio program Lendmire places files through generally runs on 12 months of statements. The separate portfolio non-QM program will consider either 12 or 24 months, depending on the file. If your deposits trended up recently, the shorter window usually produces a higher coverage figure. If your business had one rough stretch inside an otherwise strong two-year run, the 24-month window can dilute that dip.
Does A CPA Letter Fix Everything?
Not automatically. A CPA-supported expense ratio can move your qualifying income meaningfully. But it still has to land inside the program’s debt-to-income ceiling — typically capped around 50% on the programs Lendmire arranges. A stronger expense ratio helps the numerator. It doesn’t guarantee the file clears the finish line.
Getting one is still often worth it. If your standard tier assigns a higher expense ratio because you have employees on payroll, but your actual overhead runs meaningfully lower, a documented CPA letter can push meaningfully more income onto the file — sometimes enough to change what property price range you’re realistically shopping in. Lendmire’s piece on lowering the expense factor on a second home covers how that documentation typically needs to be structured and timed.
What Second-Home Leverage Actually Looks Like
Leverage on a second home runs a notch below what a primary residence gets at the same price point, and it steps down further as the loan size climbs. On the second-home ladder Lendmire’s network typically supports, purchase leverage runs up to roughly 85% on loans in the $300,000 to $1,000,000 range with a 700-plus credit profile, stepping down to around 80% through the $1,000,000 to $2,500,000 bands, and tightening further above that — into the mid-60s and 50s as loan size climbs past $3,000,000 and into eight figures. Files above roughly $4,000,000 move to case-by-case review before submission rather than a fixed published ceiling.
Reserves scale with loan size too — typically around three months of payments on smaller files, stepping to six months in the $500,000 to $1,500,000 range, and nine months above that. Credit minimums also tighten at scale: a 660 floor is common on the portfolio program broadly, but the super-jumbo tier above roughly $3,000,000 on a second home generally wants a 700-plus score along with a cleaner housing-payment history and longer seasoning on any past credit event.
Cash-out works differently depending on how much equity you’re pulling. Below 60% loan-to-value, proceeds are typically unlimited on the portfolio program; above 60% LTV, cash-in-hand is generally capped around $1,500,000 on that same program.
The Debt-To-Income Ceiling
Your qualifying income — after the expense factor is netted out — feeds straight into debt-to-income, and most programs Lendmire places files through cap that ratio around 50%. Every other monthly obligation counts against you here: your existing primary-home mortgage, car payments, student loans, credit cards, and the new second-home payment itself.
You can’t use rental income from the second home to qualify. If you did, the file would shift toward investment-property underwriting instead of true second-home treatment. That’s a different set of rules on the agency side. Fannie Mae’s own occupancy guidance draws a similar line for conventional loans. It treats a property as a second home only when its rental income isn’t used for qualifying purposes. But agency underwriting relies on traditional personal-income documentation and W-2s, not deposit-based income. That’s exactly the gap bank statement programs exist to fill.
Ability-To-Repay Still Applies
Non-QM doesn’t mean unregulated. Lenders originating these loans still have to make a documented, good-faith determination that the borrower can repay. This is the same underlying standard the CFPB’s Ability-to-Repay rule sets for residential mortgages generally, regardless of whether the loan meets Qualified Mortgage standards. That’s part of why the expense factor has to be defensible and documented rather than a guess. An underwriter has to be able to show their work.
Non-QM Isn’t A Niche Product Anymore
Nonconforming loans have been picking up real share of total mortgage activity. Scotsman Guide reports that non-QM activity is climbing ahead of FHA. Growth in investor and non-agency loan volume is driving much of this. Bank statement loans make up a meaningful slice of that non-QM volume. This isn’t a fringe workaround. It’s a mainstream path for self-employed borrowers whose traditional personal-income documentation doesn’t reflect their real cash flow.
Key Terms Defined
Expense factor — the percentage of gross business deposits a lender assumes goes to overhead, subtracted before the rest counts as qualifying income.
Eligible deposits — recurring, identifiable income deposits used in the averaging calculation; one-time transfers, loan proceeds, and unusual deposits are typically excluded or flagged for explanation.
Debt-to-income (DTI) — total monthly debt obligations, including the new mortgage payment, divided by qualifying monthly income; most programs Lendmire arranges cap this around 50%.
Commingled account — a bank account where personal spending and business cash flow both run through the same statements, which forces closer underwriting review.
Profit-and-loss (P&L) method — an alternative income calculation using an accountant-prepared statement instead of the fixed expense-ratio tiers, capped around 80% on the programs Lendmire places files through.
Frequently Asked Questions
Does the expense factor apply to every bank statement loan? It applies to business bank statements specifically, not personal ones, unless personal statements show business revenue and costs flowing through them. A purely personal account with no business activity typically isn’t hit with any expense-factor haircut at all.
Can I choose my own expense ratio? Not by default — the fixed tiers (20%, 40%, 50%) apply based on your business type and employee count unless you provide third-party documentation, such as a CPA letter, supporting a different figure. Lendmire’s comparison of expense factor versus CPA letter documentation breaks down when that override path is worth pursuing.
What happens if my business type is misclassified? Your qualifying income can come out lower than it should, since the wrong ratio gets applied to your deposits. Correcting the classification, sometimes with CPA support, is generally the fix, subject to lender review.
Do transfers from my business account count as income? Yes, generally at full value, since that money was already run through the expense-ratio math once on the business side. Documenting the transfer clearly on the statement helps the underwriter trace it without confusion.
Is a second home treated the same as an investment property for leverage? No — second-home leverage typically sits a few points below investment-property leverage at the same loan size on the programs Lendmire’s network supports, and using rental income to qualify can shift a file toward investment-property underwriting instead.
For borrowers weighing whether a bank statement loan or a straight DSCR loan fits a given property better, Lendmire’s complete DSCR loans guide covers how property-income qualification compares to deposit-based income qualification, subject to lender guidelines and program eligibility.
Say you’re self-employed and shopping for a second home. Maybe your traditional income documentation doesn’t reflect what your business actually generates. Lendmire can help you compare bank statement loan options across its wholesale network. We’ll weigh the expense factor, loan size, leverage, and reserve requirements against your specific file. Final terms depend on lender guidelines, property type, leverage, and your complete credit picture.
For current guidelines and terms, see Lendmire’s super jumbo bank statement loan programs page.
Self-employed borrowers can compare both super jumbo programs on Lendmire’s self-employed mortgages page.
About Lendmire
Lendmire is a DSCR-focused mortgage brokerage, NMLS# 2371349, placing investor loans across 40 markets, including Washington, D.C. DSCR eligibility is generally reviewed by the lender around a property’s rental income rather than personal income documentation, which fits LLC-held rentals, self-employed investors, and portfolios scaling past conventional financed-property limits. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. Fannie Mae Selling Guide — Occupancy Types (B2-1.1-01)
2. CFPB Ability-to-Repay/QM Rule Summary
3. Scotsman Guide — “Agency mortgage locks slip as non-QM gains ground in June”
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Legal disclosures. Lendmire (NMLS# 2371349) is a state-licensed mortgage brokerage that arranges financing through wholesale lender relationships. Lendmire is not a direct lender, depository institution, or registered financial advisor. The discussion above is general informational content about real estate financing — it is not financial, legal, or tax advice, and readers should consult licensed professionals for guidance on their individual circumstances. Loan inquiries are subject to lender underwriting; this article does not represent a commitment to lend. Loan terms, rates, and qualification standards vary by borrower, property, and state, and are subject to change at any time. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.
