How a Lender Counts Business Expenses on Bank Statement Income

The Quick Read: A bank statement lender does not read your tax write-offs line by line. It takes your eligible monthly deposits, treats a set share of business deposits as operating cost (the expense factor), scales the result by your ownership percentage, and counts what remains as qualifying income under the applicable program, subject to lender guidelines. The lender sets that factor, not you, though good documentation can sometimes move it.

• Lendmire’s network programs review 12 months of business or personal bank statements.
• Business-account deposits carry an expense factor. Personal-account treatment varies by program.
• Transfers, loan proceeds, refunds, and one-time windfalls come out before any averaging.
• An accountant-prepared expense ratio may help when your real costs run below the default, if the program accepts it.
• Occupancy decides the disclosure rules: owner-occupied files are consumer mortgages, and non-owner-occupied rentals are business-purpose.

Why Lenders Assume Your Expenses Instead of Reading Them

Lenders use a flat expense factor because deposits show revenue, not profit. A bank statement lists money in and money out, but it cannot tell an underwriter which outflows were real business costs and which were personal spending.

So the lender picks a percentage of business deposits to treat as cost. The rest becomes income. It is a shortcut, and it replaces the tax return’s net-profit line with an estimate built from cash flow.

That is the whole logic. A contractor who deposits a lot but pays out a lot gets a haircut. A consultant with almost no overhead gets the same haircut under a default factor, which is why documentation matters later here.

Key Terms Defined

Expense factor: the share of business deposits a lender treats as operating cost, with the remainder counted as income.

Eligible deposits: the deposits left after the underwriter removes transfers between your own accounts, loan proceeds, refunds, and one-off windfalls.

Statement window: the number of months of statements the lender reviews, which is 12 months on Lendmire’s network programs.

Ownership share: your percentage of the business, which scales the income if you do not own all of it.

Qualifying income: the monthly figure the lender tests against your debts and the new housing payment.

Commingled account: one account that mixes business revenue with personal deposits.

DTI: debt-to-income ratio, which compares your monthly debts to your qualifying income.

The Calculation in Seven Steps

The math is simple once you know the order. Here is the sequence most programs the brokerage places files with follow.

1. Choose the statement window. Network programs use 12 months. Scotsman Guide describes a wider market range of 12 to 24 months.

2. Choose the account type. Business or personal statements change where the expense comes out.

3. Scrub the deposits. Remove everything that is not real revenue.

4. Average the eligible deposits. Divide the total by the months in the window.

5. Apply the expense factor. Multiply the monthly average by one minus the factor.

6. Apply your ownership share. A 60% owner counts 60% of the result.

7. Test the result. The qualifying income goes against your debts and the new payment in a DTI test.

The formula in one line: eligible deposits ÷ months × (1 − factor) × ownership share.

The same Scotsman Guide piece uses a 50% factor as its example. Treat that as a market illustration, not a rule. Factors vary by lender and program, and Lendmire cannot promise any single factor in advance.

Personal vs. Business Statements: Where the Expense Comes Out

Business statements get the expense factor. Personal statements are treated differently, and the treatment depends on the program.

The reasoning goes like this. Money reaching a personal account has usually already paid the business’s costs. Some personal-statement programs therefore count deposits with little or no business factor. Others apply a higher factor to compensate for what they cannot see.

Practitioners disagree on this point, and lenders genuinely differ. Across the wholesale network, the stronger files often get run both ways on the same deposits. One statement type usually produces a clearly higher number.

Do not mix the two on one loan and expect the numbers to add up. Mixing is where double counting starts.

Which Deposits Survive the Screen

Only revenue survives. Before any averaging, the underwriter strips out deposits that do not represent repeatable business income.

Large, erratic deposits usually draw a letter of explanation. A longer window smooths out seasonal swings, but a single oversized deposit can still be questioned.

How the Factor Gets Set

The lender sets the factor. You do not pick it. A flat default is typical, and the borrower can only document a lower one if the program allows it.

Three things can move the number:

• Business type and cost structure. A flat factor can shortchange asset-heavy or expense-heavy businesses. A contractor paying subcontractors out of the same account may face a higher effective factor, or the pass-through deposits may be excluded.
• Documentation. A CPA, enrolled agent, or qualifying tax preparer can certify your actual expense ratio. Without that proof, the file falls back to the program default.
• Program rules. Some programs accept a profit-and-loss statement or an expense statement from a tax professional in place of the default. Scotsman Guide lists both as alternatives.

A third-party accountant’s involvement matters because lenders need reliable records. The CFPB’s compliance guide on ability-to-repay and qualified mortgage rules says a profit-and-loss statement prepared or reviewed by a third-party accountant can be used to verify current income.

The Same Deposits Under Three Treatments

Run the same 12 months of deposits through different treatments and the income changes sharply. The factors below are illustrative round numbers, not Lendmire program terms.

Moving from the default to a documented 30% ratio lifts counted income by 40%, since 70 is 40% more than 50. That swing can change the loan amount a borrower qualifies for. It is why a CPA letter is worth asking about.

Now add ownership. A 60% owner under the default counts 60% of that 50, which is 30 per 100 in business deposits. The ownership share applies after the factor, so partial owners feel both haircuts.

The reverse also holds. A CPA letter only helps when your real expenses sit below the default. An expense-heavy business gains little, and the underwriter expects any certified ratio to reflect real costs.

Where the General Rule Breaks

The formula is clean. Real files are not. These are the cases that change the math.

Commingled accounts. The underwriter must split business revenue from personal deposits, and the factor applies only to the business portion. Expect more document requests. Lendmire’s piece How a Bank Statement Lender Counts Shared Business Deposits covers that split in detail.

Wages in the same account. If you also earn wages, those deposits come out of the statement analysis. Otherwise the same dollars count twice.

Owner draws. Money you pull from the business to your personal account was already counted at the business level. Counting it again as new income is the classic double-counting error.

Pass-through flows. Contractors and agencies that route client money to subs may see those deposits excluded or a higher factor applied.

Seasonal businesses. Averaging across the window smooths peaks and troughs, but a thin off-season can still drag the monthly figure.

Letter and statements that disagree. If a CPA certifies a low ratio but the statements show heavy payroll and vendor outflows, the underwriter can reject the letter or fall back to the default. Underwriter judgment always sits on top of the formula.

Do Tax Write-Offs Hurt You?

Not directly, and that is the main reason borrowers choose this documentation. The lender is not subtracting your itemized deductions from the deposits. It is applying its own factor to the deposits it sees.

A self-employed buyer with heavy write-offs can look weak on a tax return and still look strong on deposits. The catch is that real expenses still matter indirectly. They shape whether your documented ratio is believable. Tax treatment varies, so consult a qualified professional about your own situation.

Why Lenders Document Every Step

Non-QM does not mean no documentation. It means a different document set. According to CFS Review’s summary of CFPB guidance, lenders must verify the income or assets they rely on using reasonably reliable third-party records, and those records must be specific to the individual borrower.

The federal rule sets a verification standard. It does not set an expense formula. The factor is a lender and investor guideline, and so is any minimum time in business.

How Occupancy Changes the Rules

What you buy decides which rulebook applies. An owner-occupied file, meaning a primary residence or second home, is a consumer mortgage, and TRID disclosure rules apply. A bank statement loan on a non-owner-occupied rental, including a short-term rental, is business-purpose and exempt from TRID. Lendmire’s consumer mortgage operations cover 16 states, so owner-occupied availability follows that footprint.

Leverage also splits by occupancy. These figures are typical ranges from select lenders in the network, subject to lender guidelines:

• Primary residence purchase or rate-term refinance: up to 90% LTV, with stronger files earning the top of the range.
• Primary residence cash-out: up to 80% LTV with a fixed expense ratio, or 75% LTV with an accountant-prepared ratio.
• Second home cash-out: up to 75% LTV, depending on loan size and credit.
• Investment property cash-out: around 75% LTV.
• Primary residence on asset depletion: up to 80% LTV, qualifying from liquid assets instead of deposits.

Investment purchases on bank statement documentation vary by lender, so treat any leverage claim there as lender-specific. Loan sizes typically run from $125,000 to $3,500,000, and reserves are commonly around six months of the housing payment.

Bank Statements vs. DSCR for Investors

For a pure rental, the expense factor often does not matter at all. A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. Your deposits are not the qualifying income. The statements instead prove assets, reserves, and source of funds.

Scotsman Guide makes the same contrast: a rental investor might qualify for a DSCR loan on property cash flow covering mortgage, taxes and insurance. Our complete DSCR loans guide walks through that structure.

The practical split looks like this. Owner-occupied purchases tend to fit bank statements. Pure rentals tend to fit DSCR. A self-employed buyer purchasing a rental can go either way, and each bank statement loan adds to personal DTI. Declining deposits can also hurt a statement file in a way they cannot hurt a DSCR file.

How to Prepare Your Statements Before You Apply

Clean statements make a better number. These steps document real expenses; they do not hide them.

• Run business revenue through a business account and pay business costs from it.
• Keep wages and personal transfers out of the business account.
• Write a short explanation for any unusually large deposit.
• Ask your accountant whether a certified expense ratio would land below the program default. If your real costs are higher, skip it.
• Gather 12 months of statements for each account you plan to use.

What to Do Next

If you are self-employed and want to see how the numbers work, Lendmire can help you compare bank statement loan options based on your deposits, the property, credit profile, leverage, and your goals. Reach the team at 828-256-2183 or request a quote. Lendmire is a broker arranging financing through select lenders in its wholesale network, and every file is underwritten individually.

About Lendmire

Lendmire — NMLS# 2371349 — is a mortgage broker that arranges bank statement, P&L-only, 1099-only and asset-based home financing in 16 states through wholesale lenders, on primary residences, second homes and investment properties. Every option is subject to the lender’s guidelines and full underwriting. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Scotsman Guide, Rev Up the Engine for Non-QM Lending

2. CFPB ATR/QM Small Entity Compliance Guide

3. CFS Review, CFPB Addresses Non-QMs Under Ability-To-Repay Rule