The Quick Read: You document a low expense ratio with a signed letter from a CPA, enrolled agent, or qualifying tax preparer that states your business’s actual expense-to-revenue percentage for the same months your bank statements cover. The lender, not you, decides whether to accept that figure in place of its fixed default. The bank statements must visibly support it.
- The expense ratio is the share of your business deposits the underwriter treats as operating cost before counting the rest as income.
- Through select wholesale programs, fixed ratios run 20% for a service business with no employees, 40% for one to five employees, and 50% for six or more employees or any product business. An accountant-provided ratio can replace them.
- You cannot certify your own ratio. The letter needs a licensed third party, a profit-and-loss statement that matches, and statements that tell the same story.
- Above $4,000,000, every file is reviewed case by case before submission, so expect tighter scrutiny of the documents.
- A letter only helps if your true ratio sits below the default. If it sits above, the letter can hurt.
Most founders, physicians, attorneys, and business owners who look at super jumbo bank statement loans share one problem. Their traditional personal-income documentation shows modest income after write-offs, but their deposits tell a very different story. The expense ratio is the dial between those two pictures. This article walks through how underwriting treats it, what a clean evidence package looks like, and where a low ratio stops being believable.
What Is an Expense Ratio on a Bank Statement Loan?
The expense ratio is a percentage your lender subtracts from eligible business deposits to estimate what the business spent to earn them. What remains, divided by the number of statement months, is your monthly qualifying income.
Why does it exist? A bank statement shows money coming in. It does not show payroll, contractors, rent, inventory, or equipment. HousingWire’s non-QM guide describes the same logic: a business owner may earn strong income, yet deductions such as depreciation, payroll, and contractor costs reduce what appears on traditional personal-income documentation. The lender needs some way to back out costs without a full set of books.
Across our wholesale network, programs handle this two ways:
1. A fixed ratio set by business type and headcount.
2. An accountant-provided ratio that replaces the fixed one when a licensed professional certifies it.
Personal-account files work differently. Most programs do not apply an expense ratio to personal deposits. They look instead for proof that the deposits trace back to your work. Transfers from your own business into a personal account count at 100% through select wholesale programs.
Why Does the Ratio Matter More on Super Jumbo Files?
On a large loan, a small change in the ratio moves qualifying income by a large amount, and debt-to-income headroom is usually tight. Larger balances also get more scrutiny, so the documents carry more weight.
Through select wholesale programs, loans run from $300,000 to $30,000,000. A portfolio non-QM program carries files to $6,000,000. A bank portfolio program takes twelve-month-statement files to $30,000,000 on its own ladder. That ladder begins above $4,000,000 and overlaps the portfolio program up to $6,000,000. Above $6,000,000 it stands alone.
Debt-to-income can reach 50%, subject to full underwriting. Above the super-jumbo line, a 700 credit floor applies. Reserves step up with size: 3 months to $500,000, 6 months to $1,500,000, and 9 months above that. And every figure above $4,000,000 is reviewed case by case before submission.
What does that mean for your ratio? Think of two borrowers with identical deposits. One sits on a 50% default. The other documents a lean business at a much lower figure. The second borrower’s qualifying income is far higher, and on a large loan that gap can decide whether the file fits inside 50% DTI at all. It can also decide whether you need the loan to be smaller.
How Does Underwriting Turn Deposits Into Income?
Underwriting follows a fixed sequence, and the expense ratio is only one step in it. Knowing the order tells you where a low ratio can help and where the file can still stall.
1. Choose the account type. Business and personal statements are treated differently. Business statements need at least 25% ownership.
2. Choose the window. Twelve or 24 consecutive months. Every page of every statement must be included. A transaction history never substitutes.
3. Screen the deposits. Transfers between your own accounts, loan proceeds, gifts, and one-time credits come out.
4. Apply ownership percentage if you do not own 100% of the business.
5. Apply the expense ratio. Fixed or accountant-provided.
6. Divide by the number of statement months. The result is monthly qualifying income.
7. Run debt-to-income and the rest of the file. Credit, reserves, and appraisal all still apply.
Step 3 deserves attention. Alternative-income loans are still verified loans. The CFPB describes alternative income documentation as including sources like bank statements, which differ from W-2s, pay stubs, and traditional personal-income documentation. Where consumer ability-to-repay rules apply, the Federal Register text of the rule requires a good-faith determination based on verified, documented information. That is why underwriters strip deposits they cannot identify as income, and why they want third-party support before replacing a default ratio.
A worked example, in index units so no dollars are implied. Say your eligible business deposits total 100 units over the statement window. A 50% default leaves 50 units. A certified 25% leaves 75 units. Same bank, same deposits, 50% more qualifying income. That is the stake.
| Factor | Fixed default | Accountant-certified |
|---|---|---|
| Who sets it | The program | A licensed third party |
| Basis | Business type and headcount | Your actual expenses |
| Proof needed | Statements only | Letter, P&L, statements |
| Risk | Understates a lean business | Challenged if unsupported |
What Are You Actually Documenting?
You are proving one claim: that your business spends a smaller share of its revenue than the program assumes.
| Document | What it proves | Who produces it |
|---|---|---|
| Accountant letter | The actual expense-to-revenue percentage | CPA, EA, or tax preparer |
| Profit-and-loss statement | The expense detail behind the letter | You and your accountant |
| Business proof | The business exists and you own it | License, registration, EIN |
| Ownership document | Your percentage of the business | Operating agreement or filing |
| Bank statements | The deposits and spending pattern | Your bank |
Self-certification is not accepted. A letter signed by you, or by a relative or employee with no credentials, will be rejected.
What Goes in the Evidence Package?
Hand your accountant records, not conclusions. The letter is only as strong as the files behind it, and an accountant who sees real support will sign with confidence.
Gather these before you ask:
- A profit-and-loss statement covering the same months as your bank statements.
- A general ledger or expense detail by category.
- Payroll reports and contractor payments, if any.
- Lease or rent records for office or equipment.
- A schedule of pass-through costs, such as client reimbursements.
- Your most recent business tax return, so the accountant can reconcile it.
Keep business and personal accounts separate while you build this. Mixed accounts blur the deposits and make the ratio hard to prove.
What Does an Accepted Letter Look Like?
An accepted letter is short, specific, and on the preparer’s letterhead. It names the signer, names the business, covers the exact statement period, and states one percentage.
Practitioner checklists commonly ask for these elements:
- The preparer’s name, credential, and contact details.
- The business name and your ownership share.
- The exact period, matching your statements month for month.
- The expense-to-revenue ratio, stated as a percentage.
- A statement that the preparer reviewed the business’s financial records.
- Ideally, a statement that the preparer prepared or filed your most recent return.
The most common reasons letters come back are plain. The period does not match the statements. The signer is not qualified. The figure is a round number with no support. Or the letter is stale compared with the statement window.
Lendmire’s piece on whether a super jumbo bank statement loan requires a CPA letter covers the letter question in more depth. Programs differ on whether they accept one at all, and on how low the certified figure can go.
What Do Underwriters Cross-Check?
Underwriters test the letter against the statements, and the statements against the P&L. A claimed ratio that the deposits and withdrawals contradict will be challenged.
The usual checks look like this:
- Letter versus statements. Heavy payroll, vendor payments, or rent leaving the account do not fit a very low ratio.
- P&L versus statements. Revenue and expenses should line up with what the bank shows.
- Letter versus tax return. Heavy write-offs on the return are fine. The accountant should be able to explain how the certified ratio reconciles with them.
- Deposit quality. Transfers between personal and business accounts can create inflated or circular cash flow, which invites a denial.
Across our network, the files that run into trouble are rarely the ones with a low ratio. They are the ones where the letter says one thing and the statements say another. If your actual ratio sits near the default, the letter adds little. Compare the two before you spend time on it.
How Lean Is Credible?
A low ratio is credible when the business model explains it and the statements show it. A very low figure with no visible reason invites skepticism.
Business model matters most. A solo consultant or professional practice with no staff and little overhead can plausibly run lean. That is why the fixed ratio for a service business with no employees is already the lowest tier. A business with payroll, inventory, subcontractors, or heavy equipment costs will look expensive on its statements, whatever a letter says.
Several warning signs can undercut a certified expense ratio:
- A certified ratio well below what peers in your line of business typically show.
- Large vendor, payroll, or rent payments on the statements.
- Entity structures that move costs through other accounts.
- A letter that certifies a number close to the default when the true figure is higher.
That last one cuts the other way. A letter is not a free upgrade. If your real ratio is higher than the default, certifying it lowers your income. Run the honest number first.
Which Route Fits You?
The right route depends on your real expense ratio, your business model, and what your records can support. This is how the choices stack up.
| Situation | Likely route |
|---|---|
| True ratio well below the default, records clean | Accountant letter |
| True ratio near the default | Take the fixed ratio |
| Strong year-to-date books, thin statements | Profit-and-loss method, capped at 80% |
| Deposits flow to a personal account | Personal statements, no ratio |
| Large liquid assets, uneven income | Asset allowance or assets-only path |
| Strong rent against a modest loan | Property-income loan instead |
The asset paths deserve a mention. An asset allowance divides liquid assets by 36, 60, or 84 months. An assets-only path needs no debt-to-income test when liquid U.S. assets equal the loan plus closing costs plus any carrying loss on other residential property. Retirement accounts count at 70%, or 80% at age 59½ and over. Business funds, gifts, and cryptocurrency never count.
One more fork. If the property is a true investment rental, a different test may apply. 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, and qualification runs primarily on the property’s rental income covering the payment, subject to lender guidelines. The CFPB’s business-purpose rules explain how rental property is treated. Our complete DSCR loans guide lays out when that route beats a bank statement loan.
When Should You Start?
Start before you have a contract. A letter takes lead time, and your statement window has to line up with the period the accountant certifies.
A sensible order:
1. Compare the program’s fixed ratio with your true expense ratio.
2. If your true ratio is meaningfully lower, engage your accountant.
3. Hand over the evidence package.
4. Confirm the letter’s period matches your statement window.
5. Keep accounts separate and explain any large deposits in writing.
6. Submit statements, the letter, the P&L, and business proof together.
If your accountant resists, do not push for a number. Accountants can attest only to what they reviewed. Offer more records, or ask what they can certify. Sometimes the honest answer is the default, or the P&L method.
Here is a request you can adapt:
I am applying for a mortgage using business bank statements. The lender will accept a signed letter stating my business’s actual expense-to-revenue ratio for the statement period. Could you review the attached P&L and ledger and, if the records support it, state that ratio on your letterhead? Please include your credential, the business name, and the exact months covered.
Key Terms Defined
Expense ratio: The percentage of business deposits the underwriter treats as operating cost before counting the rest as income.
Non-QM loan: A mortgage that does not follow standard agency documentation rules, often used by self-employed borrowers.
Debt-to-income (DTI): Your monthly debts divided by your qualifying monthly income.
Reserves: Liquid funds you hold after closing, counted in months of payments.
Profit-and-loss method: An income calculation based on a signed P&L, capped at 80% through select wholesale programs.
Enrolled agent: A tax professional licensed by the federal government to represent taxpayers.
Frequently Asked Questions
Do I have to submit an accountant letter?
No. Without one, the program applies its fixed ratio, such as 20%, 40%, or 50% by business type and headcount. The letter is optional, and it only pays off when your real ratio is lower than the default.
Who can sign the letter?
A CPA, enrolled agent, or qualifying tax preparer, on their own letterhead. The signer should confirm they reviewed your business records and ideally that they prepared or filed your latest return. You cannot sign for yourself.
Will the lender accept any number my accountant writes?
No. The lender decides whether to accept a third-party ratio, and the underwriter tests it against your statements. A figure the deposits and withdrawals contradict will be challenged or replaced.
Does a personal-account file use an expense ratio?
Generally not. Personal statements are screened for deposits that trace to your work instead. Transfers from your own business into a personal account count at 100% through select wholesale programs, subject to underwriting.
What if the letter and my statements disagree?
Expect questions, a request for more records, or a fall back to the fixed ratio. Fix the mismatch before submission. A matching period, clean accounts, and a P&L that reconciles with the statements solve most of it.
For a related look at how the factor gets read, see Lendmire’s piece on how a super jumbo bank statement loan reads the expense factor. 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. Every figure here is a typical range through select wholesale programs, subject to full underwriting. This is not a commitment to lend.
Self-employed borrowers can compare both super jumbo programs on Lendmire’s self-employed mortgages page.
About Lendmire
Lendmire, NMLS# 2371349, is a mortgage brokerage focused on investor financing, arranging DSCR loans in 40 states plus Washington, D.C. — 41 markets total. Qualification is based on the property’s income rather than personal income documentation, subject to lender guidelines, making it a fit for LLC-held rentals and scaling portfolios. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. HousingWire – Non-QM loans guide
2. CFPB – Seasoned QM proposed rule
3. Federal Register – Ability-to-Repay and Qualified Mortgage Standards
This article is part of Lendmire’s super jumbo bank statement loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How To Use A Personal Account For A Super Jumbo Bank Statement Loan · Super Jumbo Bank Statement Cash-Out Documentation for a Loan-Out Company · How to Consolidate Debt With a Super Jumbo Bank Statement Cash-Out
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosures. The information presented in this article is general market commentary, not financial, legal, or tax advice. Lendmire is a mortgage brokerage (NMLS# 2371349) — not a direct lender or depository institution — and loan placement is subject to lender underwriting. Nothing in this content represents a commitment to lend. Loan terms, pricing, and program availability vary based on borrower qualifications, property characteristics, and state of subject property, and are subject to change at any time. Lendmire complies with Equal Housing Opportunity requirements. Consumer access: nmlsconsumeraccess.org.