How a Lender Averages Deposits Into Bank Statement Income

The Quick Read: A lender totals the eligible deposits from 12 months of statements, removes anything that is not real income, applies an expense factor to business deposits, adjusts for the borrower’s ownership share, and divides by the number of months to get one monthly qualifying income figure. That figure then goes into the debt-to-income test with credit, reserves, and the property review. No single formula is universal, because each lender sets its own rules.

• Only deposits that survive the screening count. Transfers between your own accounts, loan proceeds, and refunds usually come out first.
• Business deposits are discounted by an expense factor, because revenue is not take-home pay.
• A partial owner counts only their ownership percentage of the business income.
• A steady or rising deposit pattern reads better than a flat average that hides a decline.
• This product is reviewed around the borrower, not the property, so every financed property adds debt against the same averaged income.

What Does “Averaging Deposits” Actually Mean?

For a self-employed borrower, traditional personal-income documentation often shows low net income because of legitimate write-offs. Bank statements show the cash that actually moved.

Across the wholesale network Lendmire works with, the standard documentation is 12 months of bank statements, either business or personal. The loan is reviewed on documented income under the applicable program, subject to lender guidelines. The lender is not skipping verification. It is verifying income from a different record.

This product is also separate from a DSCR loan, which does not average deposits at all. A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. Bank statement lending looks at the person. DSCR looks at the property. Both sit inside Lendmire’s complete DSCR loans guide as options for investors who do not fit a standard W-2 file.

The Order of Operations

The lender follows the same sequence on almost every file, and the order matters because each step changes the next. Skipping or reordering steps is how borrowers end up with a self-estimate that is far off the lender’s number.

1. Pick the window. Most programs in the network use 12 consecutive months. Some lenders look at longer periods or run two windows.

2. Sort every deposit. Each credit is labeled income or not income.

3. Total the eligible deposits.

4. Adjust by account type. Business deposits get an expense factor. Personal deposits are generally averaged with little or no haircut.

5. Apply the ownership share. A 50% owner counts 50% of the qualifying business income.

6. Divide by the number of months. The result is one monthly figure.

7. Run debt-to-income. The monthly figure is compared with your existing debts and the new housing obligation.

Which Deposits Make It Into the Average?

Most of the work happens in the sort. A deposit counts when the lender can tie it to the borrower’s income, and anything unexplained is removed or documented. The underwriter has to be able to say where each large credit came from.

Across the network, the credits that cause the most trouble are the ones that look like income but are not. A large deposit from a family member, a business loan advance, or a transfer from a savings account can inflate the total if nobody tags it. Underwriters strip these because the file has to show where the money came from.

The same logic appears in federal verification rules for consumer mortgages. The CFPB’s compliance guide for ability-to-repay and qualified mortgage rules lists bank account statements as acceptable third-party records. It also says a creditor falls short if it sees an unidentified deposit and takes no steps to confirm that it is the consumer’s income. A law-firm summary of the same rule from Hunton Andrews Kurth gives a plain example: an unidentified $5,000 deposit might be loan proceeds rather than income.

That rule explains why lenders screen deposits. It does not set a formula. The lender decides how to run the numbers within its own underwriting standards.

Personal Statements vs. Business Statements

Personal and business statements are treated differently because the money means different things. A business account holds revenue, and revenue is not what the owner takes home. A personal account usually holds what the owner already paid themselves.

Lenders differ on commingled accounts, where business and personal money sit together. Some treat the account as business and apply the factor. Others ask for a letter or a split. A few lenders also treat transfers from a business account to a personal account differently from others. That variation is why one borrower can get two different income figures from two programs using the same statements.

How the Expense Factor Gets Set

The lender sets the expense factor, and the borrower does not choose it. It is a stand-in for operating costs, applied to business deposits so that gross revenue is not treated as personal income.

Many lenders start with a default factor. A letter from a CPA, enrolled agent, or tax preparer may support a different factor, but it does not guarantee one. The letter has to state an expense percentage that the lender will accept. One securitization due-diligence exhibit filed with the SEC shows a reviewer holding to the standard factor because the CPA letter did not state an expense percentage. It also shows that documentation dated before closing was needed to use a lower factor. That is one lender’s file, not a general rule, but it shows how literal reviewers can be.

Here is a worked example using index units, not real dollars. Every assumption below is illustrative only and is not drawn from a specific lender’s program.

• Assume eligible business deposits over 12 months total 1,200 units.
• The monthly average of those deposits is 100 units.
• With a 50% expense factor, qualifying income is 50 units a month.
• With a CPA-supported 30% factor, qualifying income is 70 units a month.
• At 50% ownership, those figures become 25 and 35 units.

The same deposits produced a 40% swing in income, which is why the documentation of the factor matters so much. Tax treatment can depend on how the funds are used and how the property is held; borrowers should keep clear records and speak with a qualified tax professional before relying on any deduction.

Ownership Share, Window Length, and Trend

A partial owner counts only their percentage. The lender will ask for an operating agreement, a K-1, or a CPA letter to prove that percentage. Without proof, the lender may use a lower share or decline to count the business income.

Window length changes the answer when income moves. A rising business looks better on a shorter, recent window. A seasonal business looks fairer on a longer one. Most programs in the network use 12 months, and some underwriters will run more than one window and use the better result, but that varies by lender.

The average is not the whole story. An underwriter also reads the trend. Picture a borrower whose deposits were strong in the first six months and thin in the last six. The 12-month average may pass the math, yet the declining pattern can still lead the lender to use a lower figure or decline the file. A borrower with steady or rising deposits gets a cleaner read.

From Monthly Income to What You Can Buy

The averaged figure becomes the income side of debt-to-income. The lender adds your existing debts and the new housing obligation, then compares the total with the monthly qualifying income. A lower expense factor can still fail on debt-to-income, as the same SEC exhibit shows.

Leverage depends on occupancy and transaction type. These figures are typical ranges from select lenders in Lendmire’s wholesale network and are subject to lender guidelines:

• Primary residence purchase or refinance without cash out: up to 90% LTV, with the strongest files earning the top of the range.
• Primary residence cash-out: up to 80% LTV with a fixed expense ratio, or 75% 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.
• Asset-depletion alternative on a primary residence: up to about 80% LTV. The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.

Loan sizes generally run from $125,000 to $3,500,000, and reserves commonly sit around six months of the housing payment. Investment purchase leverage on bank statement documentation varies by lender. For investor-focused leverage guidance, the DSCR side is the better reference.

Occupancy also decides which disclosure rules apply. An owner-occupied file, meaning a primary residence or second home, is a consumer mortgage, and TRID disclosures apply. A bank statement loan on a non-owner-occupied rental, including a short-term rental, is a business-purpose loan and is exempt from TRID. The owner-occupied lane is available in 16 states through Lendmire’s consumer licensing. The broker arranges these loans through select lenders, and every file is reviewed individually.

Where the General Rule Breaks

The steps above hold for most files, but several situations change the outcome.

Declining or lumpy deposits. A flat average hides a falling trend. Some underwriters treat a decline as a red flag, and a borrower in that spot may be better served by a different product.

Documented low-overhead businesses. A CPA letter may support a lower expense factor, but only if the letter states a percentage and the lender accepts it. Documentation dated after the fact may not count.

Mixed accounts. Lenders differ on whether a commingled account is treated as business or personal. Separating the accounts before applying avoids the guesswork.

Strong income, weak debt-to-income. Even a favorable factor cannot rescue a file where existing debts are too high. Each additional bank-statement-financed property adds debt against the same averaged income.

Programs that never average deposits. One-year 1099 loans, profit-and-loss loans, and DSCR loans use other documentation.

Bank Statement Loan or DSCR for the Next Rental?

The deciding variable is what the investor wants the file to prove. A bank statement loan proves the person can carry the debt. A DSCR loan proves the property can.

If you have strong, steady deposits and one or two properties, the bank statement route can work, especially on an owner-occupied purchase where leverage can reach 90% LTV on a primary residence. If you plan to add many doors, DSCR usually fits better, because rental income is the test and your personal debt-to-income stops being the bottleneck. That is practitioner experience, not a statistic.

The flip point comes when a rental has thin coverage but your deposit history is strong. In that case the bank statement route may serve as a fallback, though it will count the new debt against your income. For a self-employed owner who occupies a property, Lendmire’s article How a Sole Proprietor Turns Deposits Into Bank Statement Loan Income is a useful companion read.

How to Pre-Check Your Own Number

A self-estimate is useful only if it follows the lender’s order. Use this checklist before you apply.

1. Pull 12 consecutive months of statements, with every page.

2. Mark every transfer, refund, loan advance, and one-time credit, and remove them.

3. Total what remains.

4. Apply a realistic expense factor if the account is a business account.

5. Multiply by your ownership percentage.

6. Divide by 12.

7. Compare the result with your monthly debts and the planned housing obligation.

The most common mistakes are averaging every credit, skipping the expense discount, and forgetting ownership share. Another is leaving unusual deposits unexplained. Keep business and personal money in separate accounts, label transfers, and keep a short written note for any large deposit that is not routine.

Key Terms Defined

Eligible deposit: A credit the lender accepts as income after removing transfers, loan proceeds, refunds, and one-time items.

Expense factor: A percentage the lender subtracts from business deposits to estimate operating costs.

Lookback window: The number of consecutive months of statements the lender reviews.

Ownership share: The percentage of a business’s income that a borrower can count, proven with an operating agreement, K-1, or CPA letter.

Debt-to-income: The comparison of monthly debts, including the new housing obligation, with monthly qualifying income.

Commingled account: An account that mixes personal and business money.

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

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. CFPB ATR/QM Small Entity Compliance Guide

2. Hunton Andrews Kurth, CFPB General QM final rule summary

3. SEC ABS-15G due-diligence exhibit