Bank Statement Loan Calculator Inputs for Business Deposits

The Quick Read: The inputs that drive a bank statement loan calculator are statement type, number of months, eligible deposits, the lender’s expense factor, your ownership share, and your other monthly debts, and the result is only as good as the deposit total you feed in. A calculator can estimate your income. It cannot decide what a lender will count.

• Statement type: business accounts take an expense factor, while personal accounts usually count eligible deposits at or near full value.
• Months: most programs in Lendmire’s wholesale network are built around 12 months of statements, and some lenders accept or prefer 24.
• Eligible deposits: this is gross credits minus transfers, loan proceeds, refunds, and unexplained one-time deposits.
• Expense factor: the lender sets it, not the borrower, though some programs accept an accountant-prepared ratio.
• Ownership share: qualifying income scales to the percentage of the business you own.

What Does a Bank Statement Loan Calculator Actually Do?

A bank statement loan calculator turns a pile of deposits into a monthly income figure a lender can test against your debts. It does that in a fixed order: total the credits, strip out what is not income, apply the expense factor, scale for ownership, and divide by months.

Bank statement underwriting exists for borrowers whose traditional personal-income documentation understates cash flow. Heavy write-offs can make a self-employed investor look thin on paper even when the business is healthy. This lane is reviewed on documented income under the applicable program, subject to lender guidelines. The documentation is the deposit history rather than the tax return.

One distinction saves a lot of confusion. A DSCR loan on a rental qualifies primarily on property-level rental income covering the payment, subject to lender guidelines, so your deposits are not the measure. Bank statement income matters when you qualify on personal income instead. A common case is a self-employed investor buying or refinancing a home to live in. Lendmire’s complete DSCR loans guide covers the rental side of that split.

The Input Glossary: What Goes in Each Box

Every field in a calculator maps to something on your statements or to a decision the lender makes. This table shows where each number comes from and what it does to the result.

The first six fields decide income. The last two decide how much of that income the loan consumes.

Step One: Pick the Statement Type

Business statements capture revenue before the owner pays themselves, so the lender applies an expense factor. Personal statements capture what actually reached the owner, so most programs count eligible deposits at or near full value.

Neither is automatically better. If you draw most of the profit out of the business, personal statements can show more. If profit stays inside the company, business statements may capture more. Lendmire’s piece How Personal vs Business Deposits Affect Bank Statement Qualifying Income goes deeper on that choice.

Do not add the two together. A transfer from your business account to your personal account appears in both sets of statements, but it is one dollar of income. Lenders generally pick one account set per file, and a calculator that lets you enter both totals will overstate the result.

Step Two: Clean the Deposit Total

The deposit-cleaning step is where most calculator results go wrong. A calculator asks for “total deposits,” but a lender wants eligible deposits, and the gap between the two can be large.

Work through each statement line by line. Mark every credit as income or not income, then total only the income. This table shows the usual treatment, though each lender sets its own rules.

Here is an index example. Say gross deposits across the lookback equal 100. Own-account transfers take out 7, a refund takes out 2, and one unexplained deposit takes out 3. Eligible deposits are 88. Everything after this step starts from 88, not 100.

Payment apps deserve special care. Customers may pay a business through Zelle, Venmo, or a card processor. Some lenders accept a business narrative that explains how customers pay, so those deposits count as revenue rather than personal transfers. Others will not, so ask before you rely on them.

Multiple accounts add one more wrinkle. If a business runs two operating accounts and you move money between them, the same dollar can appear twice. Treat each transfer as one event. A commingled account, where personal and business activity share one account, has to be separated line by line by source before it can be used.

Step Three: The Expense Factor Is the Lender’s Number

The expense factor estimates how much of your business revenue goes to costs. You do not choose it. The lender’s program sets it, and it varies across programs. Some use a flat factor. Others tier it by business type or headcount. Some allow an accountant-prepared ratio in its place.

Across Lendmire’s network, the strictest overlays want the accountant’s document on letterhead and in the accountant’s own words. A letter you wrote yourself is accepted by some lenders and rejected by others. If your real expense ratio is lower than the lender’s fixed figure, an accountant-prepared ratio can move the result more than any other input.

Here is the sensitivity in index terms. Take the 88 of eligible deposits from above. Under an illustrative 50% factor, qualifying income is 44. Under an accountant-documented 25% ratio, it is 66. That is a 50% increase with identical deposits. The percentages here are illustrations only, since actual factors depend on the lender and program.

Tax treatment varies, and borrowers should consult a qualified professional before relying on any deduction.

Step Four: Ownership Share and the Months Divisor

Ownership share scales the result. A 100% owner multiplies by one. A 60% owner multiplies by 0.6, because the lender will only count the portion of business income that belongs to you. Enter the share from your operating agreement or entity documents, not a rounded guess.

The months input sets the divisor. Choose the lookback, then divide eligible income by that number of months.

Twelve months favors a business that has grown recently, since the average includes only recent strong months. Twenty-four months smooths out seasonality and helps if your best months fell more than a year ago. The cost is that weak months in the older year pull the average down. Mismatches cause real errors, so never divide a 24-month deposit total by 12, and never mix a 12-month figure from one account with a 24-month figure from another.

Lendmire’s network programs are generally built around 12 months of statements, subject to each lender’s guidelines.

The Master Formula and How Each Input Moves It

Put the steps together in one chain.

• Business statements: eligible deposits, divided by months, times one minus the expense factor, times ownership share.
• Personal statements: eligible deposits, divided by months, times ownership share where it applies.

This table shows how changing one input at a time moves the index result, starting from the baseline of 44.

Two inputs are fully in your control: how carefully you clean deposits, and whether you commission an accountant’s ratio. The expense factor and the lookback options belong to the lender. The same statements can produce very different income at different lenders.

From Income to Loan Size: DTI and Leverage

Qualifying income feeds a debt-to-income test. The lender adds your proposed housing payment and your other monthly debts, then compares the total to your qualifying income. This is why the payment-side fields matter: loan amount, term, taxes, insurance, and any HOA dues all change the payment. The calculator on this site is an illustrative estimate, and it cannot tell you what a lender will approve.

Leverage depends on the transaction and the occupancy, so each figure below carries its own label. All of these are typical ranges from select lenders in Lendmire’s wholesale network, subject to lender guidelines and credit approval.

• Primary residence, purchase or rate-term: 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, and 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: tops out around 75% LTV.
• Primary residence, asset-depletion alternative: up to 80% LTV, qualifying from liquid assets instead of deposits.

Loan sizes typically run from $125,000 to $3,500,000, and reserves commonly sit near six months of the housing payment. Investment purchase leverage on bank statement documentation varies by lender. An investor focused on rentals will usually find the leverage conversation belongs on the DSCR side.

Disclosure rules follow occupancy. 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 a business-purpose loan and is exempt from TRID. Keep the two straight when you plan a file.

Where the General Rule Breaks

The formula above covers most files, but several situations bend it.

The sole proprietor with a clean wall. If personal and business money never touch, personal statements may work and skip the expense factor. Lendmire’s piece How a Sole Proprietor Separates Business Deposits on a Bank Statement Loan covers how to build that separation.

Reserves left in the business account. A program may haircut cash parked in a business account when counting reserves, because that cash is also working capital.

Asset statements versus income statements. The statements that document your down payment and reserves are separate from the income set, and they typically need fewer months. The exact timing is lender-specific.

NSF activity. Repeated overdrafts or returned items can raise questions even when deposits look strong. Explain any pattern before the lender asks.

Investment rentals. 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 federal rule text on business-purpose credit is why a pure rental purchase usually moves to DSCR and leaves deposit math behind.

A “no-doc” assumption. A bank statement loan is not a no-document loan. The CFPB’s compliance guide lists bank account statements among reasonably reliable third-party records, and says a creditor generally cannot rely on what a consumer says about income. Bank statements are one lender-designed way to meet that expectation.

Common Input Mistakes

• Entering a 12-month total in a monthly field.
• Using a 12-month total but dividing by 24, or the reverse.
• Counting the same business-to-personal transfer in both account sets.
• Leaving loan proceeds and refunds inside the deposit total.
• Picking your own expense factor instead of the lender’s.
• Entering 100% ownership when you hold a partial share.
• Treating the calculator’s output as an approval.

Pre-Calculator Checklist

1. Decide whether you will use business or personal statements.

2. Gather every page of every statement for the lookback.

3. Mark each credit as income or not income.

4. Label transfers and write a short note for each large deposit.

5. Confirm your ownership percentage from entity documents.

6. Ask an accountant whether your real expense ratio is lower than a fixed factor.

7. List your other monthly debts from your credit report.

8. Decide on the loan amount and term you want to test.

Key Terms Defined

Eligible deposits: the credits a lender will count as income after transfers, loan proceeds, refunds, and unsourced one-time deposits are removed.

Expense factor: the percentage of business revenue a lender assumes goes to costs, set by the lender’s program.

Ownership share: the percentage of the business you own, used to scale the income a lender will count.

Lookback period: the number of months of statements used to average your deposits.

DTI: debt-to-income, meaning your total monthly debts including the new payment compared with qualifying income.

Asset depletion: a qualifying method that uses liquid assets rather than deposits to support the loan.

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. Lendmire is a mortgage broker that arranges these loans through select lenders in its wholesale network, and its consumer mortgage licensing covers 16 states, so availability depends on where the property sits. A clean deposit review before you apply is the single most useful hour you can spend, because the calculator can only be as accurate as the statements behind it.

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. eCFR 12 CFR Part 1026, Subpart A

2. CFPB ATR/QM Small Entity Compliance Guide