How the Bank Statement Loan Expense Ratio Works for a Solo Service Business

The Quick Read: The expense ratio is the share of your business deposits a lender assumes goes to running costs, so only the remainder counts as your qualifying income. For a solo service business, the lender sets that share, not you, and a documented low-overhead operation may earn a lower one on select programs, subject to lender guidelines.

• The lender sets the factor. You document your case for a lower one.
• Business-account deposits get the factor applied. Personal-account programs typically skip that step.
• Transfers, loan proceeds, refunds and one-time items come out before any math.
• A solo owner with no staff, rent or cost of goods has the strongest argument for a lower factor.
• Rental purchases usually fit DSCR better than a personal-income test.

You run a one-person consulting practice, a mobile detailing route, or a bookkeeping shop. Your deposits look healthy, but your tax return shows heavy write-offs. A bank statement loan exists for exactly that gap. The expense ratio decides how much of those deposits turns into income on paper. This guide walks through the mechanics, the variations, and the places the general rule breaks.

Key Terms Defined

Bank statement loan: A mortgage that is reviewed around documented income from your bank deposits instead of traditional personal-income documentation, under the applicable program and subject to lender guidelines.

Expense ratio (or expense factor): The percentage of eligible business deposits a lender treats as operating costs and subtracts before counting income.

Eligible deposits: Deposits that look like real, repeatable business revenue after the lender removes transfers, loan proceeds, refunds and one-time items.

DTI (debt-to-income ratio): Your monthly debts, including the new housing payment, divided by your qualifying monthly income.

Non-QM: A mortgage that falls outside standard agency rules and runs on individual lender program guidelines.

DSCR: Debt service coverage ratio. It measures whether a rental property’s income covers its own monthly obligation.

What Is the Expense Ratio, and Why Do Lenders Use It?

The expense ratio is a stand-in for the costs your bank deposits don’t show. Deposits are gross revenue. They are not profit. A lender can’t tell from a statement alone what you spent on software, insurance, vehicles or help, so it applies a percentage to estimate that.

Across our wholesale network, programs generally handle this in one of two ways. They apply a fixed expense factor to business deposits. Or they accept a profit-and-loss statement or expense letter prepared by a third-party tax professional. Trade press describes the same pattern: a self-employed borrower provides 12 to 24 months of personal or business statements, and a non-QM lender can use a standard expense factor, with 50% given as an example, or accept a third-party P&L or expense statement, per Scotsman Guide. That article is dated, so treat 50% as an illustration, not a current standard.

Here is the part that surprises people. No law sets the number. The federal Ability-to-Repay rule requires lenders to consider factors like income, debts and the monthly mortgage payment, and to verify the income they rely on using reasonably reliable records, per the CFPB’s Small Entity Compliance Guide. It doesn’t prescribe an underwriting model. So the expense factor is each lender’s own way of meeting that requirement.

Our own programs use a 12-month statement window. Qualifying income comes from deposit averages with lender-specific expense factors. We never promise a specific factor, because each file is underwritten individually.

How the Calculation Works, Step by Step

Underwriting follows a repeatable sequence. The exact settings change by program, but the order rarely does.

1. Pick the statement type and period. Business or personal accounts, over the window the program uses. Our programs use 12 months.

2. Screen the deposits. The lender strips out transfers between your own accounts, loan proceeds, refunds, gifts and one-time items. This follows the principle that income must be verified from reliable records.

3. Apply your ownership share. A sole proprietor counts at 100%. A partner’s income is prorated to their stake.

4. Apply the expense factor. On business accounts, the formula is eligible deposits × ownership % × (1 − expense factor) ÷ months in the window. Personal-account programs typically skip this step.

5. Run DTI. The resulting monthly income is measured against the full housing payment plus your other debts. Credit, assets and reserves get reviewed too. Reserves commonly run around 6 months of the housing payment.

A simple way to see the lever: compare two factors on identical deposits. A 50% factor counts half your deposits. A documented 30% factor counts 70% of them. That is 40% more qualifying income from the same bank activity. This is plain arithmetic, not a promise that any lender will offer a given factor.

Why a Solo Service Business Sits at the Favorable End

A solo service business has the lightest cost structure on paper. There’s usually no payroll, no storefront rent, no inventory and no cost of goods. That is the argument for a lower factor.

But the label alone doesn’t earn it. Lenders want documented low overhead. A graphic designer who works from a spare room and pays for software has a believable story. A contractor who pays subcontractors out of the same account has deposits that don’t equal margin.

Programs across the network vary here. Some accept a lower factor with an accountant-prepared document. Others hold to a fixed factor regardless. The strictest overlays want the preparer to hold specific credentials. Always ask for the factor in writing before you build a plan around it.

For the tactics that make a lower factor more likely, see Lendmire’s piece How to Win a Lower Expense Factor on a Service-Business Bank Statement Loan.

What Counts as “Solo,” and What Tips You Out?

Solo means you do the work and bear the costs. Edge cases blur that line.

The pattern is consistent. Anything that adds a real cost the lender can see makes a rock-bottom factor harder to argue. Tell your broker about changes before the file goes in. Surprises mid-review hurt more than the change itself.

A Worked Example: One Solo Owner, Statements to Income

Run the numbers on a solo bookkeeper with 12 months of business statements. These are modeled assumptions, not market data, and no dollar figures are needed to see the flow.

• Start with total deposits. Every credit into the business account for the full window.
• Remove the noise. Transfers from her savings, a one-time loan to cover equipment and a client refund all come out.
• Apply 100% ownership. She is a sole proprietor, so nothing is prorated.
• Apply the factor. A program with a fixed factor takes its share. A program that accepts a CPA-prepared ratio may use a lower, documented one.
• Divide across the months in the window. The result is her monthly qualifying income.
• Measure DTI. That income gets tested against the proposed housing payment plus her existing debts.

The big swings happen at steps two and four. Cleaner deposits and a supported lower factor both raise income. Neither is automatic.

Which Deposits Count?

The lender is asking one question: will this deposit show up again? If you can show it will, it counts.

Business Statements vs. Personal Statements

Which account the deposits land in changes the math. On business statements, the factor applies. On personal statements, programs typically skip the factor, but they strip out anything that isn’t clearly income, such as transfers and personal payments.

Commingled accounts are the trap. If personal and business money mix, a personal-statement review removes more deposits, or a lender may apply a factor to the whole account. Both reduce income. If you run everything through one account, talk to your broker before applying. Cleaning up the account for a few months ahead of time can help.

One more wrinkle. If business funds sit in an account shared with a partner, ownership share can cut your income on top of the factor. Check how a program treats that before you choose a statement type.

When a CPA or Tax-Preparer Document Helps

A document from a third-party tax professional can support a lower factor, where the program allows it. Trade press names a third-party P&L or an expense statement from a tax professional as the alternative to a standard factor. A CPA letter doesn’t guarantee a lower factor. It helps only where the program accepts one and the numbers support it.

A useful letter is specific. It states the preparer’s credentials, how long they’ve known the business, the business type, and the expense percentage they support, based on the most recent records. Vague letters don’t move underwriters.

On owner-occupied cash-out, our programs reflect this directly: up to 80% LTV with a fixed expense ratio, or 75% with an accountant-prepared ratio, by loan size and credit. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.

Lendmire’s article How to Get a Lower Expense Factor on a Service Business Bank Statement Loan covers the preparation side in more depth.

Seasonal and Lumpy Income

Averaging smooths seasonality, but only within limits. A landscaper with heavy summers and thin winters is averaged across the full window. That helps. But one large client making up most of your deposits, or income that falls toward the end of the window, raises questions. Frequent overdrafts or returned items draw attention too.

In practice, underwriters review the trend. Flat or rising deposits read well. A steep decline in recent months can pull qualifying income down or prompt a more conservative read.

Where the General Rule Breaks

A few named edge cases deserve attention:

• Missing documentation. If you can’t support a lower factor, the file reverts to the program’s default factor.
• Program variation. Factor floors, accepted documents and preparer credentials differ by program. Don’t assume one lender’s approach applies to another.
• Pass-through deposits. Money that flows through to subcontractors may be excluded or may call for a higher effective factor.
• High margin, still a haircut. Even a very profitable solo business can see a conservative factor if it can’t document low overhead.
• Investment property. This is the big one, covered next.

Bank Statements or DSCR for a Rental?

Match the loan to the property. A bank statement loan is a personal-income test. Your deposits, factor and DTI drive the answer. That fits an owner-occupied home.

Occupancy decides the disclosure regime. An owner-occupied file, meaning a primary residence or second home, is a consumer mortgage with standard consumer disclosures. A bank statement loan on a non-owner-occupied rental, including a short-term rental, is business-purpose and exempt from those consumer disclosure rules. Know which one applies to your property.

On leverage, here is how it breaks down across our network:

These are typical ranges from select lenders, subject to lender guidelines, credit and loan size. Loan amounts generally run from $125,000 to $3,500,000.

For rentals, investors often find DSCR a cleaner fit. A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. It doesn’t ask the expense-factor question at all. Many self-employed investors use bank statements for the home they live in and DSCR for the rentals. If you’re weighing the two on an investment property, Lendmire’s complete DSCR loans guide lays out how that side works.

Prefer to qualify from savings instead of deposits? An asset-depletion alternative runs up to about 80% LTV on a primary residence. Loan terms on alt-doc products follow each lender’s program sheet. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.

Prep Checklist Before You Apply

• Open or keep a dedicated business account, and stop mixing personal spending into it.
• Label transfers and one-time deposits so they’re easy to exclude.
• Gather 12 months of statements for the account you plan to use.
• Write down your overhead honestly: staff, rent, equipment, software, vehicles.
• Ask a CPA or enrolled agent what ratio they can support, and whether they’ll document it.
• Ask your broker for the factor in writing for each program you’re considering.
• Check your credit profile and reserve cash. Reserves commonly run about 6 months of the housing payment.

Tax treatment varies; consult a qualified professional.

Common Mistakes

• Assuming the factor is a federal rule. It isn’t.
• Assuming you can pick your own ratio. The lender sets it.
• Counting every deposit as income.
• Expecting a CPA letter to automatically lower the factor.
• Treating a bank statement loan as a no-questions product. Lenders still assess your ability to repay.
• Using a bank statement loan for a rental without comparing DSCR first.

A mortgage broker arranges these loans through select lenders in its wholesale network. This is not a commitment to lend, and every file is underwritten individually.

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. Scotsman Guide, “Rev Up the Engine for Non-QM Lending”

2. CFPB ATR/QM Small Entity Compliance Guide