How the Bank Statement Loan Income Formula Works for an S-Corp or LLC Owner

The Quick Read: A lender turns your business or personal deposits into one monthly income figure by removing non-income credits, applying ownership share, applying an expense factor, and dividing by the months reviewed. Your W-2 salary and tax-return profit are not the starting point.

• Qualification runs on 12 months of business or personal bank statements, subject to lender guidelines.
• The lender sets the expense factor, not the borrower. A documented, accountant-prepared ratio can improve it.
• The result still feeds debt-to-income, so this is not a loan that skips the income test.
• On a primary residence, leverage reaches up to 90% LTV on a purchase or rate-term refinance, through select lenders.
• Occupancy decides the paperwork regime, so a rental and a home are treated differently.

S-corp and LLC owners hit the same wall with conventional underwriting. The tax return shows a small number because the business writes off expenses, and retained profit never shows up as personal income. Bank statement underwriting reads the cash instead. This piece walks through the formula, the variations across programs, and the points where it breaks down.

What Is a Bank Statement Loan Income Formula?

It is a lender-written method for converting deposits into qualifying income. No regulator publishes one. Each non-QM program sets its own rules. The common frame is simple: eligible deposits, times ownership share, times one minus the expense factor, divided by months reviewed.

Across the wholesale network Lendmire works with, programs share that skeleton but differ on the details. Some lenders ask for 12 months of statements. Others prefer 24 on thinner files. Expense factors, ownership minimums and account rules all move from program to program.

The loan still requires proof. As Scotsman Guide explains, a self-employed borrower without a W-2 supplies personal or business statements, and the lender can apply a standard expense factor or use a profit-and-loss statement or an expense statement from a third-party tax professional. Non-QM lenders still confirm repayment capacity. They just have more flexibility in how they do it.

Key Terms Defined

Eligible deposits: Credits that represent real business revenue, after non-income items are removed.

Expense factor: The share of deposits the lender treats as business costs, so it never counts as income.

Ownership share: Your percentage of the business, which limits how much of its deposits can be yours.

Lookback window: The consecutive months of statements the lender averages, commonly 12.

DTI: Total monthly obligations divided by qualifying monthly income, including the new housing payment.

Documented ratio: An expense ratio supported by an accountant-prepared statement or P&L instead of the lender’s default.

How Does Underwriting Turn Deposits Into Income?

Underwriting follows the same eight steps on most files. Order matters, because each step shrinks or reshapes the number before the next one.

1. Choose the account type. An S-corp or LLC whose revenue runs through the entity usually submits business statements. An owner paid straight into a personal account may submit personal ones. Business deposits get an expense factor. Personal deposits generally do not, but they must trace back to the borrower’s work.

2. Pull the window. Every page, every account used, consecutive months. A missing page is a common reason a file stalls.

3. Strip ineligible credits. Transfers between your own accounts, loan proceeds, refunds and one-time deposits come out. The lender is counting income, not account activity.

4. Average what is left over the months in the window.

5. Apply ownership share. With partners or other shareholders, the lender wants proof, usually an operating agreement or a K-1.

6. Apply the expense factor. Deposits times one minus the factor, divided by months.

7. Feed the result into DTI. The monthly income is divided into total obligations, including the new payment.

8. Layer in the rest of the file. Credit, assets, reserves (commonly around 6 months of the housing payment), property type and leverage limits all still apply.

The CFPB’s ATR/QM compliance guide lists at least eight factors a creditor must weigh on consumer-purpose loans, and debt-to-income or residual income is one of them. That is why step seven exists.

A Round-Number Illustration

Use units, not dollars. Say your eligible monthly deposits come to 100 units. At a 50% factor, 50 units count as income. At a documented 30% factor, 70 units count. Same bank activity, 40% more qualifying income. That gap is why the factor is the most important variable in the whole formula.

Why Does the Expense Factor Change From Program to Program?

Because lenders price their own risk. The factor reflects the lender’s view of how much of a typical business’s deposits go to costs, and the borrower does not pick it. Scotsman Guide uses 50% as an example. It is an example, not a rule, and a lender may use a different figure depending on business type and documentation.

Two structures show up across the network:

• Default factor. A fixed ratio applied to deposits when you offer no further proof.
• Documented ratio. A lower ratio supported by an accountant-prepared statement or P&L. On owner-occupied cash-out files, the program uses a fixed expense ratio, and an accountant-prepared ratio can improve the result. Leverage on those files tops out at 80% LTV, set by loan size and credit. Keep that ceiling separate from the expense factor itself. Final terms depend on the lender’s guidelines, the property type, and the borrower’s complete credit picture.

Claiming a lower ratio without proof generally falls back to the default. A self-prepared P&L usually does not count as proof either. The CFPB’s compliance guide describes reliable records as those prepared by someone other than the consumer, the creditor or the mortgage broker, which is why the accountant’s name matters.

Two programs can therefore produce two different incomes from identical deposits. If one lender’s number disappoints, the file is worth showing to another program before concluding the deal does not work.

S-Corp Owner or LLC Owner: Where the Formula Treats You Differently

The formula is the same, but the inputs differ.

The S-corp has its own twist. Many owners pay themselves a modest W-2 salary and leave profit in the company. Personal statements then show little, while the business account shows the full revenue. In that pattern, business statements with an expense factor can capture more income. If you instead draw most of the profit into your personal account on a regular basis, personal statements may be simpler. Which route wins depends on the owner’s pay pattern and the lender’s rules.

A low salary does not by itself block the loan, because the deposits are the basis. It can still matter elsewhere, such as in how a lender reads consistency.

Partial Ownership, Worked in Order

Say a multi-member LLC shows 100 units of eligible monthly deposits after the scrub, and you own 40%. The lender applies share first, giving 40 units. A 50% factor then leaves 20 units of monthly income. A documented 30% factor leaves 28. Same deposits, same ownership, a 40% gap again. If the lender had applied the factor but ignored share, the number would be badly overstated, so expect the ownership proof request.

Which Edge Cases Break the General Rule?

Several named situations push the number down or change the path.

• Commingled accounts. Mixed personal and business activity draws more scrutiny and more deposit stripping. Separating accounts early helps.
• Declining or lumpy deposits. The average falls, and underwriters read a drop as a warning. For these owners, a property-income structure may fit better than personal income testing.
• Missing ownership proof. Without an operating agreement or K-1, the lender may count less than your true share.
• Multiple accounts or entities. Whether they combine depends on the program, and each account used needs its full statement history.
• Rental deposits. Income deposited from other properties raises questions about whether it is business revenue or rent already counted elsewhere.
• Tight DTI. Strong deposits can still fail if existing obligations are heavy, because the income is only one of two tests.

The Occupancy Edge Case

Here is where owners most often mix up the rules. Occupancy decides which regime applies. A bank statement loan on an owner-occupied property, whether 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.

Regulation Z exempts, in the words of 12 CFR 1026.3, credit extended primarily for a business, commercial or agricultural purpose. Purpose controls, not the label “investment.” This is general information, not a legal conclusion on any specific file.

What Leverage Can an Owner Expect?

Leverage depends on occupancy and transaction type, and mixing the figures is a common mistake.

These are typical ranges from select lenders in the network, subject to lender guidelines, loan size and credit. The top of the range goes to stronger files. Loan amounts generally run from $125,000 to $3,500,000. Term length follows each lender’s program sheet, so do not assume extended or interest-only structures carry over from the DSCR side.

Consumer mortgage licensing for this lane covers 16 states, so availability for owner-occupied files depends on where the property sits.

When Does a Bank Statement Loan Beat a DSCR Loan, and When Does It Not?

A bank statement loan tests you. A DSCR loan tests the property, and qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. Scotsman Guide places DSCR products under the same non-QM umbrella, as the business-purpose investment side.

That difference shapes how an owner scales:

• Bank statement route helps when the rental is new or has no lease history, when it is in rehab, when the rent is thin against the payment, or when the owner has strong deposits and heavy deductions.
• DSCR route is cleaner for a stabilized rental, for owners with uneven or falling deposits, and for borrowers who do not want personal income tested on each purchase.

Each bank statement mortgage stacks on personal DTI, which limits how many properties you can add that way. DSCR reviews each property on its own rent. Plenty of investors use both: bank statements for the primary residence, DSCR for entity-held rentals. Programs below 1.00 coverage are available through select lenders in the network, but LTV and terms adjust.

For deeper treatment, Lendmire’s complete DSCR loans guide covers the property-income side.

Common Misconceptions

• “Bank statement means no documentation.” The loan is reviewed on documented income under the applicable program, subject to lender guidelines. Credit, assets and the property get reviewed too.
• “50% is the law.” It is a common default, not a rule.
• “I can choose my factor.” The lender sets it.
• “Every deposit counts.” Transfers, refunds and loan proceeds come out.
• “It avoids DTI.” The derived income feeds DTI. Only a property-income product skips personal DTI.

Why Your Number May Come In Lower Than Expected

Most shortfalls trace to a handful of causes: transfers inflating the apparent deposits, commingled accounts, a default factor where a documented one was possible, ownership share applied at less than 100%, and a declining trend across the window. Preparation fixes most of these. Keep business and personal funds separate, line up an accountant-prepared statement before you apply, gather ownership documents, and keep deposits consistent into the period reviewed.

An owner-occupied file also adds reserves, commonly around 6 months of the housing payment, so check liquidity alongside income.

Tax treatment varies; consult a qualified professional about how this applies to you.

This article is general information, not legal or tax advice. Readers should consult a qualified professional, such as an attorney or CPA, about their own situation.

A broker’s side-by-side across programs is where the expense-factor gap shows up. Lendmire’s piece How an S-Corp Owner Picks the Highest-Income Bank Statement Program shows how that comparison works.

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 (March 2016 edition)

3. eCFR, 12 CFR 1026.3