How the Bank Statement Loan Income Formula Works for Partial Business Ownership

The Quick Read: The formula takes the eligible deposits in the account, subtracts an expense factor if it is a business account, multiplies the result by the share of the business you own, and divides by the number of months reviewed, so a partial owner counts only a slice of what lands in a shared account. Personal-account deposits usually skip the ownership step.

• Deposits in your personal account are usually counted without an expense haircut and without an ownership percentage.
• On business statements, the ownership step is a gate first and a multiplier second. Programs set a minimum share, and below it the entity’s statements generally cannot be used at all.
• The lender program sets the expense factor, not you. A lower one generally needs third-party support, such as an accountant-prepared profit-and-loss statement.
• If the goal is a rental purchase, a DSCR loan skips this formula entirely and looks at the property’s income instead.

Key Terms Defined

Eligible deposits are the deposits that count as income. Transfers between your own accounts, loan proceeds, refunds and other non-income credits get removed.

Expense factor is the percentage of business deposits the lender treats as overhead. A 50% factor means half of eligible deposits is assumed to go to costs.

Ownership percentage is your documented share of the business. It applies when the statements belong to the business and not to you personally.

Qualifying income is the monthly figure the lender uses after every adjustment. It is the number your debts get measured against.

Debt-to-income ratio (DTI) is your total monthly debts divided by your monthly qualifying income. A smaller income figure pushes this ratio up.

Lookback period is the number of months of statements the lender reviews. Most files placed through Lendmire’s network use 12 months.

Why Does Ownership Percentage Enter the Formula?

Ownership enters because a business account holds money that belongs to more than one person. If you own 40% of a company, the other 60% of every deposit is a partner’s money. The lender is trying to estimate what reaches you, not what flows through the account.

Think of the account as a shared pot. The expense factor takes out the part that pays for payroll, rent, inventory and supplies. Ownership then divides what is left among the owners. The remaining slice is the part the lender can reasonably call yours.

Once money moves from the business into your own account, the logic changes. Those transfers are already your income. That is why the ownership step generally matters only on business statements.

How Does the Formula Run, Step by Step?

The sequence is the same across most programs Lendmire places files with, though each lender sets its own details. Here is the full path with one running example. The example uses modeled assumptions, not a program quote: a 50% expense factor and 40% ownership.

1. Pick the account type. This choice drives everything after it. Personal statements and business statements follow different paths.

2. Screen the deposits. Underwriters keep income-related deposits and remove transfers between your accounts, loan funds and one-off credits.

3. Total the screened deposits across the lookback period, usually 12 months.

4. Apply the expense factor. With a 50% factor, each 100 of eligible deposits becomes 50.

5. Multiply by ownership. At 40%, that 50 becomes 20. A 40% partner counts 20% of the gross deposits.

6. Divide by the months in the lookback. The result is monthly qualifying income, which then goes against DTI, credit and reserves.

Does the order of steps four and five matter? No. Multiplication gives the same answer in either order, so applying ownership before the expense factor changes nothing. What does matter is screening deposits first, before any percentage touches them, and dividing by months last.

What Do the Same Deposits Look Like at Different Ownership Levels?

The same deposits can produce very different qualifying income depending on your share. This table runs 100 units of eligible deposits through a modeled 50% expense factor. The ownership levels are illustrations, not program minimums.

Moving from 100% to 40% cuts qualifying income to two-fifths of its value. The same monthly debts then take up two and a half times as much of your qualifying income. That is the real cost of a smaller share: it hits your DTI directly, not just your income line.

Personal, Business or Accountant-Prepared: Which Path Counts More?

The account type often matters more than the ownership share. If a business pays you regularly into a personal account, that path can beat the business-statement path. The table shows the three common routes.

Two cautions apply. First, with a personal account, underwriters may still ask for evidence that business expenses are paid from a separate account. Second, a lower expense factor is never a right. The lender sets the factor, and your accountant’s letter is evidence the lender may or may not accept. The statements generally need to reconcile with the profit-and-loss figures. Lendmire’s piece DSCR vs Bank Statement When Business Expenses Shrink Income shows why that factor can swing the result so much.

What Happens Below the Ownership Floor?

Below the floor, you fall off a cliff, not down a slope. Programs set a minimum ownership share for using business statements. If your share is under it, that entity’s statements generally cannot be used, and there is no prorated partial credit.

The minimum varies by lender program, and no regulator publishes one. Some lenders allow ownership to be added together across co-borrowers when each one holds a meaningful stake. Others do not. Ask about the floor and the aggregation rule before you gather documents.

When you are below the floor, you have fallback options:

• Use personal statements, if the business pays you directly into your own account.
• Use a different documentation type, such as asset depletion, which qualifies from liquid assets.
• For a rental purchase, move to a DSCR loan, which does not look at the business at all.

How Do You Prove Ownership?

You prove ownership with documents, not with a number on the application. The lender wants a paper trail that matches what you stated. Typical documents include:

• The operating agreement, partnership agreement or stock records showing your share.
• A K-1, which reports your allocated share of income for the entity.
• A CPA letter confirming your ownership percentage and the business’s standing.
• Evidence that the business exists and has operated for a meaningful period.
• Every page of every statement in the lookback.

When documents conflict, the file stalls. If the operating agreement says 40% and the application says 50%, the lender will follow the document and ask you to explain the difference. Fix the paperwork before you submit, not after.

Entity type changes what the proof looks like:

Program details differ by lender, so treat the last column as the general pattern, not a rule.

Where Does the General Rule Break?

A simple formula meets messy businesses. These are the edge cases that come up most often on partial-ownership files.

Draws that do not match your share. You may own 40% but take half the profit, or the reverse. Programs generally prorate by documented ownership, and some lenders ask for the agreement language that governs distributions. A mismatch needs a written explanation.

Pass-through deposits. A contractor whose account shows subcontractor payments moving straight through may need a higher effective expense factor. The lender may also exclude those deposits entirely.

Commingled accounts. If a business account also carries personal spending, or a partner’s account mixes with the company’s, underwriters look closely. Clean separation makes the file easier to read.

Ownership that changed during the lookback. If you bought in or sold down during the statement window, the lender may use only the period that reflects your current share, or ask for a shorter lookback. Treatment varies by program.

Several businesses. Each business account is generally run through the formula on its own. Each one has to meet the ownership minimum with its own documents. The monthly results are then added together.

Spouses and co-borrowers. Combining ownership across co-borrowers is sometimes allowed. The floor and aggregation rules vary by program.

Declining deposits. A falling trend can trigger a letter of explanation or a shorter lookback. Lenders care about the direction, not just the average.

K-1 income versus deposits. A K-1 shows income allocated to you on paper. A bank statement program values the cash that actually arrived, then prorates it. The two numbers can differ a lot, and the deposits are the ones that count here. Agency-style underwriting works from traditional personal-income documentation, which is a separate documentation path altogether.

What Sits Behind the Formula?

No federal rule fixes the expense factor or the ownership percentage. Those are lender and program conventions. The CFPB’s ability-to-repay compliance guide confirms that a lender can consider self-employment income. It also says a lender relying on deposits must confirm those deposits are the borrower’s personal income. That requirement is why transfers between your own accounts and unexplained credits get stripped out.

The same rulebook demands reliable evidence. The CFPB’s implementation guide names bank statements among the records a lender can use.

Occupancy decides the disclosure regime. A bank statement loan on an owner-occupied home, whether a primary residence or a second home, is a consumer mortgage, and consumer disclosure rules apply. A bank statement loan on a non-owner-occupied rental, including a short-term rental, is business-purpose and exempt from those rules. Which one you are in depends on how you will use the property, not on how you document income.

Should a Rental Investor Use This Formula or a DSCR Loan?

For a pure rental purchase, DSCR usually fits better. A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. DSCR itself is monthly rent divided by the monthly housing payment, which covers principal, interest, taxes, insurance and any HOA dues. Your business share, your expense factor and your DTI do not drive that calculation. You can read how the whole structure works in Lendmire’s complete DSCR loans guide.

Picture a 40% partner in an operating company who wants to buy a rental. On the bank statement path, the income used would be only a fraction of the account’s deposits, and ownership would need to be proven. On the DSCR path, the question becomes whether the rent covers the payment. If the coverage ratio is thin, select lenders in the network offer programs below 1.00, though loan-to-value and terms adjust.

The bank statement path earns its place in other situations:

• You are buying a primary residence. Select lenders allow up to 90% LTV on a primary-residence purchase or rate-term refinance, with the strongest files earning the top of that range.
• You want to qualify from liquid assets. Asset depletion runs up to about 80% LTV on a primary residence.
• You are pulling cash from an owner-occupied home. Cash-out on a primary residence or second home goes up to 80% LTV with a fixed expense ratio. It steps down to 75% when the ratio comes from an accountant-prepared figure, depending on loan size and credit.
• You are pulling cash from an investment property. Cash-out on bank statement documentation tops out around 75% LTV. Investment-property purchase leverage on this documentation varies by lender.

Across the network, loan sizes typically run from $125,000 to $3,500,000, and reserves are commonly around six months of the housing payment. These are typical ranges from select lenders, not guarantees, and every file is underwritten individually. For a closer look at how counted deposit income gets sized, see how much deposit income a business owner needs. Tax treatment can depend on how the funds are used and how the property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.

Where to Go From Here

Bank statement loans qualify on documented income under the applicable program, subject to lender guidelines. This is not a commitment to lend. Reach the team at 828-256-2183.

Whether the share you own is 25% or 75%, the deciding question stays the same: whose money is actually in the account, and can you prove it on paper?

About Lendmire

Lendmire — NMLS# 2371349 — is a DSCR and non-QM mortgage brokerage with investor loan programs in 41 markets, including Washington, D.C. DSCR eligibility is commonly reviewed by the lender around property-level rent rather than personal income documentation, subject to lender guidelines, and the brokerage helps arrange financing for LLC-owned portfolios beyond conventional financed-property limits. Recognized by Scotsman Guide as a Top Mortgage Workplace in 2025 and 2026.

References

1. CFPB Ability-to-Repay and Qualified Mortgage Small Entity Compliance Guide

2. CFPB Ability-to-Repay and Qualified Mortgage Implementation Guide