Bank Statement Income Calculation Rules for a Self-Employed Owner

The Quick Read: Lenders turn twelve months of bank statements into one monthly income figure by removing deposits that are not real business income, applying an expense factor to business accounts, adjusting for your ownership share, and dividing the result by the months reviewed. Every program sets its own version of those inputs. Your tax return is not the starting point.

• The loan is reviewed on documented income under the applicable program, subject to lender guidelines.
• Deposits are the raw material. Your balance matters for reserves, not for income.
• The expense factor is set by the program, not chosen by you. A third-party document may change it.
• Transfers between your own accounts, loan proceeds, refunds, and one-time items usually come out.
• The final figure goes into a debt-to-income test, so your personal debts still count.

Key Terms Defined

Qualifying income is the single monthly income number a lender uses to approve the loan. It is a calculated figure, not what you earn on paper.

Eligible deposit is a deposit the underwriter accepts as real, repeatable business income.

Expense factor is the share of business deposits the lender assumes goes to running the business. Only the remainder counts as your income.

Debt-to-income ratio (DTI) is your total monthly debts divided by your qualifying income.

Lookback window is the number of months of statements the lender averages. Twelve is common, and some programs allow twenty-four.

Ownership share is your percentage of the business. Partial owners usually get credit only for their slice.

What a Bank Statement Loan Actually Is

A bank statement loan is an alternative-documentation mortgage for people whose traditional personal-income documentation understates what their business really brings in. Write-offs shrink taxable income. A lender using the return sees the shrunken number. A lender using deposits sees the cash flowing through your accounts.

Across the wholesale network Lendmire works with, the common baseline is twelve months of business or personal bank statements. Qualifying income comes from deposit averages and lender-specific expense factors. Scotsman Guide describes these loans as a way for self-employed borrowers to qualify on actual income rather than the tax-return figure. It also describes the guidance as having both an art and a science to it.

The “art” is real. This is manual underwriting. A person reads your statements, and the person’s judgment matters.

The Calculation, Step by Step

The order below is how most programs work. The details change by lender.

1. Choose the window. Twelve consecutive months is common. Scotsman Guide’s non-QM overview notes that some programs ask for twelve to twenty-four months.

2. Pick the account type. Personal statements, business statements, or sometimes both.

3. Scrub the deposits. The underwriter removes anything that is not business income.

4. Apply the expense factor to business deposits. The program sets it based on business type and documentation.

5. Apply your ownership share. A 60% owner generally gets 60% of the result.

6. Average over the window. The adjusted total is divided by the number of months. That gives one monthly figure.

7. Run the DTI test. The monthly figure is compared with your total monthly obligations.

8. Review the trend. The underwriter checks whether deposits are steady, rising, or falling, and whether the business proof matches.

The Master Formula

In words: eligible deposits, times one minus the expense factor, times your ownership share, divided by the months reviewed. On personal statements the expense factor step is generally skipped. A business-activity check takes its place.

Which Deposits Count and Which Come Out

The scrub is where borrowers lose the most income. Underwriters want money that came from customers, not money that merely moved.

Large deposits are not automatically dead. A sourced deposit, backed by an invoice, contract, or closing statement, may stay in. An unexplained one usually goes.

Personal vs Business Statements

The same deposits can produce very different numbers depending on the account type. Business statements take an expense factor. Personal statements generally do not, but the lender checks that the deposits come from a real business.

Many owners guess wrong about which account type will favor them. Across the programs Lendmire places files with, a low-overhead business, such as a consultant or a tradesperson with few costs, often gets more from personal statements. A business with real costs and clean accounts may do fine either way. Run both when the program allows it.

The Expense Factor: The Most Contested Input

The expense factor exists because gross deposits are not profit. A contractor who deposits a lot also pays for materials, labor, and fuel. The lender estimates that cost with a percentage and removes it.

You do not choose the number. The program sets a default fixed factor. Some programs allow a lower factor when a third-party professional, such as an accountant or tax preparer, prepares a profit-and-loss statement or expense letter that supports it. Scotsman Guide’s overview gives 50% as an example of a standard factor. Treat that as an illustration, not a rule. The factor varies by lender and by documentation.

A flat factor can understate a lean business. It can also flatter a heavy-cost business. That is why the document option matters. If your real costs run well below the default, a professionally prepared expense document may raise your qualifying income.

Ownership Share and Multiple Owners

If you own part of the business, expect the income to be scaled to your share. Many programs also set a minimum ownership percentage before business statements can be used at all. That threshold is program-specific, so get it in writing before you plan around it.

Multiple accounts or multiple businesses add one more rule: do not count the same dollar twice. If the business pays you an owner draw and you deposit it into a personal account, the money appears in both places. Only one counts.

Choosing the Window, and What Seasonality Does

A twelve-month average smooths a lumpy year. A twenty-four-month average smooths it more, but it drags in any weak stretch. Neither is better in the abstract.

A simple decision rule works well:

• Rising income: the shorter window usually helps, because older low months are left out.
• Falling income: expect the underwriter to notice either way. A decline is a red flag at any window length.
• Seasonal income: the average already spreads the busy months across the slow ones. A longer window shows that the pattern repeats.
• Very lumpy deposits: expect a request to explain the business model.

Averaging only tells part of the story. The underwriter also reads the trend. Two files with the same average can get different answers if one is climbing and the other is sliding.

From Qualifying Income to DTI

Here is where bank statement loans differ from rental-property loans. The monthly figure is divided into your obligations. Those include the proposed housing cost plus your other debts, such as car loans and cards.

Your debt-to-income (DTI) ratio comes from dividing your total monthly obligations by the monthly income figure the lender calculates from your bank statements. When that calculated income is higher, the same debts produce a lower ratio. A lower expense factor applied to your deposits raises the calculated income in the same way.

Each additional bank statement loan adds to your personal debts. That is one reason owners who scale a rental portfolio often look at the property-based route instead.

Why Tax Returns Tell a Different Story

The same business can produce two very different qualifying incomes. The tax return reflects deductions, depreciation, and strategic write-offs. The deposit method starts with cash received and applies a program’s expense assumption instead. For an owner with heavy write-offs, the deposit figure is often higher.

It can also go the other way. A business with real costs and a generous deposit trail may not get an edge from the deposit method. Tax treatment varies; consult a qualified professional.

Where the Federal Rule Fits

Owner-occupied bank statement loans are consumer mortgages. Federal ability-to-repay rules require the lender to consider eight underwriting factors. Under the CFPB’s small entity compliance guide, a creditor generally must verify what it relies on using reasonably reliable third-party records. It generally cannot rely on what a consumer says about income. Bank statements are one of the records that can serve. The rule text is at eCFR.

Notice what the rule does not do. It does not hand out a formula. Every program writes its own. It also sets no minimum time in business. That is a program overlay.

Rental properties work differently. Loans on non-owner-occupied rentals, including short-term rentals, are business-purpose loans, so owner-occupied disclosure rules like TRID do not apply to them. Occupancy decides which regime governs the file.

What the Program Looks Like in Practice

On owner-occupied files, most programs in the network let strong files reach up to 90% LTV on a primary-residence purchase or rate-and-term refinance. Stronger credit and reserves earn the top of that range. On a primary-residence cash-out, expect up to 80% LTV with a fixed expense ratio. A second-home cash-out tops out around 75% LTV. Investment-property cash-out also tops out around 75% LTV. Investment purchase leverage on bank statement documentation varies by lender.

Loan sizes generally run from $125,000 to $3,500,000, and reserves commonly sit near six months of the housing payment. An asset-depletion alternative, qualifying from liquid assets, can reach up to about 80% LTV on a primary residence. All of this is subject to lender guidelines, and every file is underwritten individually. Terms follow each lender’s program sheet, so do not assume extended terms.

Lendmire’s complete DSCR loans guide explains the property-based alternative for rentals. For owners weighing a refinance, Lendmire’s piece VA Cash-Out vs Bank Statement Cash-Out for a Self-Employed Owner covers the equity side.

Clean Up Before You Apply

Most of the damage on a bank statement file is self-inflicted. Fix these before an underwriter sees them.

• Separate the accounts. Mixed personal and business spending makes every deposit harder to classify.
• Source your large deposits. Keep the invoice, contract, or closing statement beside the statement.
• Stop moving money in circles. Transfers between your own accounts get removed anyway, and they clutter the trail.
• Keep business proof current. A license, registration, or website shows the business is real and active.
• Do not pad the account. A sudden deposit right before applying draws attention, not credit.

Common Mistakes

• Counting every deposit. Transfers, refunds, and loan proceeds will be stripped out.
• Assuming the expense factor is fixed by law. It is a program input, not a federal number.
• Picking one window without comparing. Run both when the program allows it.
• Forgetting ownership share. A partial owner’s income is scaled down.
• Ignoring the trend. A longer-window average can look healthy on paper even when recent deposits are falling, and an underwriter will notice the decline.
• Using a bank statement loan to scale rentals. Each loan adds to personal DTI. A property-based loan may fit better when deposits are weak and rent is strong.

Where the General Rule Breaks

Businesses under two years old. Program overlays often ask for a longer history. Some underwriters weigh liquid assets and credit alongside a shorter record.

W-2 plus self-employment. A lender need not verify income it does not rely on, so mixed documentation is sometimes possible. Whether it is allowed varies by program.

Declining deposits. Expect extra scrutiny and possibly a different program.

Commingled funds. The underwriter may separate them by hand, and income can drop in the process.

What Varies by Lender, and What to Ask For

The logic is universal: scrub, adjust, average, test. The inputs are not. Ask each lender for these in writing:

• the lookback windows allowed
• the default expense factor and when a lower one is available
• the minimum ownership percentage for business statements
• whether personal statements count at full value
• how large deposits must be sourced

That list is what lets a broker compare programs side by side. One lender’s strict overlay may be another’s flexible one, and the same file can land very differently.

If You Want to See Your Own Numbers

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. Lendmire is a broker arranging financing through select lenders. This is not a commitment to lend.

Owners who keep their accounts separate and their deposits documented usually find the calculation works in their favor.

About Lendmire

Lendmire (NMLS# 2371349) is a mortgage broker licensed for consumer lending in 16 states. Bank statement, P&L-only, 1099-only and asset-based mortgages for self-employed and high-net-worth borrowers are arranged through wholesale lenders on primary residences, second homes and investment properties; every file is underwritten by the lender under its program guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Scotsman Guide: Don’t Shut the Door on Quality Borrowers

2. Scotsman Guide: Rev Up the Engine for Non-QM Lending

3. CFPB ATR/QM Small Entity Compliance Guide

4. eCFR, 12 CFR 1026.43