Bank Statement Loan Income Calculation From Twelve Months of Deposits

The Quick Read: A lender turns twelve months of bank statements into one monthly income figure by totaling every deposit, removing credits that are not real income, applying an expense factor to business accounts, crediting only your ownership share, and dividing the result by twelve. The lender sets the expense factor, not you, so any math you run yourself is an estimate. The file is reviewed on documented income under the applicable program, subject to lender guidelines.

• The formula: eligible deposits ÷ 12 × (1 − expense factor) × ownership share.
• Eligible means income only. Transfers between your own accounts, loan proceeds, refunds and one-time asset sales usually come out first.
• Business statements get an expense factor. Personal statements are generally counted without one, after non-income items are removed.
• The result feeds a debt-to-income test. It does not stand alone. Credit, reserves and the property still matter.
• Clean routing helps. How your deposits flow between accounts can move the final number more than most borrowers expect.

Key Terms Defined

Eligible deposit: a credit to your account that the lender accepts as business or personal income.

Non-income credit: a deposit that is not earnings, such as a transfer from your savings, a loan advance or a refund.

Expense factor: the percentage of business deposits the lender treats as operating cost before counting the rest as your income.

Ownership share: the percentage of a business you own. Lenders credit only that portion of its deposits.

Lookback window: the span of statements the lender averages, usually twelve or twenty-four consecutive months.

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

How Does the Twelve-Month Formula Work Step by Step?

Underwriting follows six steps in a fixed order. Each step changes the number, and skipping one produces a figure the lender will not recognize.

Trade coverage in Scotsman Guide describes the standard setup. A self-employed borrower with no W-2 supplies twelve to twenty-four months of personal or business statements. The lender applies a standard expense factor, or accepts a profit-and-loss statement or a third-party expense statement instead. The 50% figure in that article is an example, not a rule.

1. Collect the window. You need twelve consecutive, complete months. Every page counts, including pages that look blank.

2. Total the deposits. Add every credit in every account that carries the income. Looking at one account out of several gives an incomplete picture, as Scotsman Guide points out.

3. Strip the non-income credits. Remove transfers between your accounts, loan proceeds, refunds and one-time items.

4. Apply the account-type treatment. Business statements take an expense factor. Personal statements generally do not.

5. Scale by ownership share. If you own 60% of the business, the lender credits 60%.

6. Divide by twelve. The result is monthly qualifying income, which then enters a debt-to-income test alongside credit, assets and reserves.

Across the wholesale network Lendmire works through, programs follow this same skeleton. They differ on the expense factor, on what documents can replace it, and on how much explanation each deposit needs.

Worked Example: Twelve Months of Deposits

The table below is a modeled illustration, not market data. Amounts are in arbitrary index units, not dollars, so you can follow the logic without anchoring to a real number. Each row shows what came in, what the reviewer excluded, and what stayed.

Gross deposits: 1,300 units.

Excluded credits: 130 units.

Eligible deposits: 1,170 units.

Now apply the business-account treatment. Assume a 50% expense factor and 100% ownership, both modeled assumptions.

Eligible deposits after the factor: 585 units.

Monthly qualifying income: 48.75 units.

Notice what happened. One tenth of the deposits disappeared at screening. Half of the rest disappeared at the expense factor. Borrowers who judge themselves by gross deposits are usually surprised by the final figure.

What Counts as Income and What Does Not?

Deposits that trace to customers, clients or earned work generally count. Deposits that cannot be tied to earnings generally do not. Reviewers check this line by line because a lender cannot rely on what a borrower says about income. The CFPB’s compliance guide says the lender must verify the amounts it relies on, and records should come from someone other than the borrower or the lender. A statement issued by your bank meets that description.

Several deposits fall in a gray zone, and these are the ones that trigger questions:

• A client reimbursement. If it repays an expense you fronted, the reviewer may treat it as a wash rather than income. An invoice helps.
• A large one-off payment. A single big month is questioned. Expect a request for a contract or invoice that explains it.
• Cash deposits. Round-number cash deposits draw attention. Without a documented source, they tend to be excluded.
• A spouse’s deposit. If it is not income from the business or your own work, it generally does not count toward your figure.

A deposit with no confirmed source is exactly the weakness underwriters are trained to avoid. A short written explanation, attached before they ask, saves a round of questions.

Business Statements Versus Personal Statements

Business statements carry an expense factor because deposits are revenue, not profit. Personal statements are generally counted without one, because deposits there are closer to take-home pay. This is how most programs in the network we see treat the two, though individual lender sheets decide.

The factor is set by the program, not chosen by the borrower. A third-party expense statement or P&L can sometimes replace it, which is why some self-employed investors ask an accountant to prepare one before applying. A documented ratio that is lower than the default factor can raise qualifying income meaningfully. The lender still has to accept the document and reconcile it with your deposits.

Why do these loans exist at all? Per Scotsman Guide, they let self-employed borrowers qualify on actual income rather than the figure on their traditional personal-income documentation. Depreciation, write-offs and pass-through structures can make taxable income look small beside the cash that moves through an account. Tax treatment varies; consult a qualified tax professional.

Same Deposits, Different Outcomes

Small input changes move the result a lot. The table reuses the modeled 1,170 eligible units from above and changes one input at a time. All figures are monthly index units, not dollars.

The factor alone swings the result by about 40% between the first and third rows. Ownership share swings it by about the same amount. This is why the account type and the factor deserve more attention than the deposit total.

When Income Isn’t Steady

Reviewers read the trend, not just the average. A twelve-month window shows where you are now. A twenty-four-month window smooths seasonality, but it can pull the average down when your recent months are your strongest. Lendmire’s piece Bank Statement Loan Income Formula: 12 vs 24 Months of Deposits covers that choice in detail.

Here is a simple illustration with modeled personal-account figures. Suppose the latest twelve months average 97.5 units a month and the prior twelve averaged 85. A twenty-four-month average comes out at 91.25. The longer window cost you income, so a borrower in that position would want the shorter one.

The reverse also happens. Picture a seasonal business with one huge quarter and three weak ones. A longer window can steady the average and reduce the weight of a single spike. Declining income is the pattern reviewers worry about most. If your recent months are falling, expect questions even when the average clears.

Where the General Rule Breaks

The formula assumes clean, single-purpose accounts. Real files rarely cooperate. These are the situations where the general rule bends.

Several accounts or locations. Owners often run separate accounts for cash receipts, card payments or individual locations. All of them belong in the calculation. If payroll runs from a separate account and you move money in to fund it, combining accounts can count the same dollars twice. Reviewers watch for that, so label each transfer.

Commingled personal and business money. This usually does not disqualify a file. It does raise the burden of proof on every deposit. Expect explanation letters and possibly a P&L or a CPA letter.

Loan-out and entity structures. When income is paid through one company and then onward to you, the split affects what counts.

Younger businesses. A shorter history leaves less to average. Liquid assets and credit quality may carry more weight in that case, and the answer depends on the lender.

A P&L that disagrees with the deposits. If the P&L supports less income than the statements show, the lower number can control. Reconcile the two before you submit.

From Qualifying Income to Qualifying for the Loan

The monthly income figure is only one input. The CFPB’s earlier compliance guide lists monthly debt-to-income or residual income among eight factors a lender weighs for ability to repay. That guide also notes the ability-to-repay rule does not set comprehensive underwriting standards. For that reason, no single federal formula converts deposits to income, and each program writes its own.

Occupancy decides which disclosure regime applies. A bank statement loan on an owner-occupied home, 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. Short-term rental rules can vary by city, county, HOA, and property type, so investors should confirm local rules before relying on projected rental income.

Leverage depends on the use and the occupancy. These are typical ranges across select lenders in Lendmire’s wholesale 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% when an accountant prepares the ratio.
• Second home cash-out: up to 75% LTV, depending on loan size and credit.
• Investment property cash-out: tops out around 75% LTV.
• Investment property purchase: varies by lender on bank statement documentation.
• Asset-depletion alternative on a primary residence: up to about 80% LTV, qualifying from liquid assets.

Loan sizes generally run from $125,000 to $3,500,000, and reserves commonly sit around six months of the housing payment. Lendmire is a broker that arranges these loans through its network, and its consumer mortgage licensing covers 16 states. Every file is underwritten individually, and nothing here is a commitment to lend.

Bank Statement Loan or DSCR Loan for Your Next Rental?

A bank statement loan is reviewed for you. A DSCR loan is reviewed for the property. That single difference decides most of the choice.

With a bank statement loan, your personal debts still count in the DTI test, and your deposits carry the file. With a DSCR loan, rent is tested against the property’s own debt service, and your deposits are not pooled. DSCR loans are designed for non-owner-occupied investment properties. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage. The complete DSCR loans guide explains how that review works.

Bank statements tend to fit an investor whose personal income needs to carry the file, such as someone buying a first rental with no rent history. DSCR tends to fit an investor who wants the property to carry it. Honestly, some investors run both calculations before deciding. It is a sensible exercise, because the stronger path is not always the obvious one.

Self-Check Before You Apply

Run this audit on your own statements before a loan officer sees them:

• Do you have twelve complete, consecutive months for every account that carries income?
• Does every statement include all pages?
• Can you name the source of every large or round-number deposit?
• Have you marked transfers between your accounts so they are easy to exclude?
• Are overdrafts or gaps explainable in a sentence or two?
• Would an accountant-prepared expense letter or P&L help your case?
• Does your ownership percentage match your business documents?

Next Step

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.

About Lendmire

As a mortgage broker (NMLS# 2371349), Lendmire helps self-employed and high-net-worth borrowers in 16 states qualify on bank statements, a profit-and-loss statement, 1099s or liquid assets instead of tax returns, through wholesale lenders. Lendmire is never the lender; program terms are set by the lender and its guidelines. 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. Scotsman Guide, “Don’t Shut the Door on Quality Borrowers”

3. CFPB ATR/QM Small Entity Compliance Guide (February 2021 version)

4. CFPB ATR/QM Small Entity Compliance Guide (March 2016)