Cpa Letter Cut The Expense — The Quick Read: Yes, a CPA letter can cut the expense factor a lender applies to your bank-statement income, but only down to a program floor, never to zero. It has to come from a licensed preparer, cover the exact months your bank statements cover, and confirm they’ve actually reviewed and filed the business’s return. A self-certified number from you doesn’t count. And if the “second home” is really a rental, this whole conversation may not even apply — that’s a DSCR loan instead.
Here’s the part most articles skip: the expense factor isn’t a federal rule. That rule just requires a lender to make a reasonable, good-faith check of your repayment-capacity — it doesn’t dictate a percentage. So the expense-factor number you’re fighting with is program policy, not law. That’s exactly why a CPA letter works on some files and gets rejected on others.
What Is An “Expense Factor,” Exactly?
An expense factor is the percentage a lender subtracts from your business deposits before counting the rest as income. If your business brings in deposits every month and the lender assumes a chunk of that covered overhead, the factor is how big that assumed chunk is.
Across the bank-statement programs Lendmire places files with, the fixed tiers typically run 20% for a service business with no employees, 40% for a business with one to five employees, and 50% for a business with six or more employees or any product-based business. Some files skip the whole exercise when deposits land in a personal account, since the theory is the business already paid its own bills before the money got there. Business-account deposits get the fixed tier applied by default.
Can A CPA Letter Actually Lower It?
Yes — a signed letter from a CPA or enrolled agent can replace the lender’s flat assumption with your business’s real, documented expense ratio. On most files in Lendmire’s network, an accountant-provided ratio is one of the accepted alternatives to the fixed 20/40/50 tiers.
But there’s a floor. No program will certify a ratio down to nothing, and the letter has to earn its keep. To be accepted, it typically needs to:
- Name the preparer — full name, credential, license number, firm
- Name the business and confirm the preparer has reviewed its financials
- Confirm the preparer has filed or completed the business’s most recent tax return
- State the certified expense ratio for the exact period your bank statements cover
Miss any of those and the letter often gets bounced outright — not just ignored, but flagged, which can slow the underwriter’s confidence in the rest of the file.
Why A CPA Letter Isn’t The Same As An Audit
This matters more than most borrowers realize. A CPA letter, in the accounting-standard sense most of these fall under, is a preparation or compilation engagement. That’s explicitly a no-assurance service. The NCACPA’s explainer on SSARS 21 states plainly that compilations are attest services which do not provide any assurance.
In plain terms: your CPA is certifying a number, not auditing your books. That’s precisely why lenders still apply floors and still scrutinize the letter’s wording instead of taking it at face value. It’s a certification, not a guarantee.
Key Terms Defined
Expense factor (expense ratio): the percentage of business deposits a lender assumes went to overhead before counting the rest as qualifying income.
Bank-statement loan: a non-QM mortgage where qualifying income is built from deposit history instead of traditional personal-income documentation — common for self-employed borrowers whose returns understate real cash flow.
CPA letter: a signed statement from a licensed preparer certifying a specific expense ratio for a specific documented period, used to replace a lender’s default assumption.
Compilation engagement: an accounting-standard category where a CPA prepares or organizes financial figures without offering any assurance or audit opinion on their accuracy.
DSCR loan: a loan underwritten on a rental property’s own income covering its payment, rather than the borrower’s personal or business deposits. Lendmire’s complete DSCR loans guide walks through how that qualification path works.
Does This Apply If The “Second Home” Is Really A Rental?
Not the same way — and this is where a lot of borrowers structure the wrong loan. If you actually intend to rent the property out, a DSCR loan reviewed on the property’s own cash flow is the more natural tool, not a bank-statement file built on your personal deposits. It’s an underwriting convention that individual bank-statement programs built on their own, inside the boundary set by the Ability-to-Repay rule.
A genuine second home has to be genuinely personal-use. Occupancy intent isn’t a technicality here — it changes which program applies, which appraisal form gets pulled, and whether the expense-factor conversation even comes up. Lendmire’s breakdown of how expense factor stacks up against a CPA letter on a second home goes deeper on where that line sits.
It’s also worth knowing the appraisal itself looks different. Rental-comparison forms like Fannie Mae’s Form 1007 exist to document market rent when a property is being qualified on its own income. Fannie Mae’s own guidance notes the form is only required when rental income is used to qualify and the subject is a one-unit investment property. A true second home, qualified on your income rather than the property’s, skips that step entirely. Different transaction, different paperwork.
Which Businesses Actually Benefit?
Low-overhead service businesses — consulting, brokerage, professional practices — see the biggest lift from a CPA letter. Their real costs often sit well under the fixed 40% or 50% tier a lender would otherwise assume. So certifying the actual number can meaningfully raise qualifying income.
A goods-heavy or high-headcount business is a tougher case. Its real costs are often already close to the fixed tier, so a CPA letter barely moves the needle — and it’s not worth the paperwork or the risk of a rejected letter muddying the file.
What Does This Look Like At Different Loan Sizes?
Bank-statement qualification runs across a wide range through Lendmire’s wholesale network — from $300,000 up to $30,000,000, split across two program lanes. A portfolio non-QM program carries files to $6,000,000, and a separate bank-portfolio jumbo program carries twelve-month-statement files up to $30,000,000 on its own leverage ladder — roughly 65% at the smaller end of that ladder, stepping down toward 60% and then 55% as loan size climbs, interest-only capped at 60% or the band’s ceiling, whichever is lower.
On a second home specifically, leverage typically runs a notch below what a primary residence gets at the same size — for example, purchase financing around 85% loan-to-value in the $300,000 to $1,000,000 range on select programs, stepping down as the loan size grows, with everything above roughly $4,000,000 reviewed case by case before submission rather than quoted as a flat percentage. Credit typically needs to clear a 660 floor on the portfolio program (700 above the super-jumbo threshold), with reserves running three to nine months depending on loan size. These are typical ranges from select wholesale-network guidelines, not universal terms — every file gets underwritten individually.
Across the files Lendmire’s network sees, one pattern shows up again and again. A self-employed borrower with a clean 24-month deposit history gets the biggest boost from a CPA letter. That’s because the fixed tier assumption was never close to their real overhead to begin with. Take a physician with a lean consulting practice and no staff — they often land at the fixed 20% tier by default anyway. The letter helps most when the default tier and reality are far apart. That tends to happen with businesses that have no employees but higher billing volume than the tier assumes.
What Kills A CPA Letter’s Chances?
A vague letter is worse than no letter at all. If it doesn’t state a certified methodology, doesn’t cover the full statement period, or reads like a character reference instead of a specific certification, expect it to be rejected. Expect the underwriter to also look harder at everything else in the file afterward.
The most common mistakes:
| Mistake | Why It Fails |
|---|---|
| No stated methodology | Underwriter can’t verify how the ratio was calculated |
| Covers wrong date range | Must match bank statement period exactly |
| General “vouching” language | Reads as a reference, not a certification |
| Missing preparer credentials | No license number or firm name to verify |
| Implies audit-level assurance | Compilations can’t claim assurance — raises red flags |
Programs differ on which credentials they’ll accept, and some don’t even set a floor — none of this is federally standardized. That’s also why a profit-and-loss statement sometimes works as a separate documentation path. It usually comes with a higher expense assumption, and it’s not interchangeable with the CPA-letter route.
Frequently Asked Questions
Does a CPA letter work the same way on a DSCR rental loan?
Generally no. A DSCR file is built around the property’s own rental income covering the payment, subject to lender guidelines — not your personal or business deposits — so the expense-factor and CPA-letter conversation usually doesn’t come up on a straightforward rental purchase at all.
Can I write my own expense-ratio statement instead of hiring a CPA?
No. A self-certified number from the borrower is never accepted in this space. The whole point of the letter is third-party credential — it has to come from a licensed CPA, enrolled agent, or qualifying tax preparer who has actually reviewed the business’s financials.
What if my expenses fluctuate a lot year to year?
The letter has to certify a ratio for the exact period your bank statements cover, so a preparer working from a full, consistent set of records can usually still produce a defensible number even with some year-to-year swing. Talk to your preparer about which period gives the clearest picture.
Does a CPA letter eliminate the expense factor entirely?
No. It replaces the lender’s flat assumed percentage with a lower, documented one — it doesn’t remove the concept, and there’s still a program floor below which even a certified ratio won’t go.
What if my CPA won’t write the letter?
Some preparers are cautious about signing anything that could look like an assurance statement beyond a compilation engagement. In that case, a profit-and-loss documentation path or a straight fixed-tier bank-statement file may be the more realistic route, depending on the program and your business type.
If you’re weighing a second-home purchase against pulling equity from a rental you already own, it’s worth comparing both financing paths before you commit to one file structure. Lendmire can help you compare where a CPA letter genuinely moves the needle versus where a standard bank-statement tier or a DSCR structure fits better, based on your business, your credit profile, and the property itself. Reach Lendmire at 828-256-2183 or request a quote to see how a specific file lines up.
Tax treatment can depend on how funds are used and how a property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.
For current guidelines and terms, see Lendmire’s super jumbo bank statement loan programs page.
Self-employed borrowers can compare both super jumbo programs on Lendmire’s self-employed mortgages page.
About Lendmire
Lendmire (NMLS# 2371349), a non-QM mortgage broker serving investors in 40 markets including Washington, D.C., helps structure DSCR scenarios commonly evaluated around a property’s rental income rather than personal income paperwork, subject to lender guidelines. A Scotsman Guide Top Mortgage Workplace in 2025 and 2026, Lendmire places loans through wholesale investor lenders and is not a direct lender.
Lendmire’s Top Mortgage Workplace recognition is documented by Scotsman Guide 2025 Top Mortgage Workplace and Scotsman Guide 2026 Top Mortgage Workplace.
Get Started
Ready to find the right loan for you?
In about 30 seconds you can review financing options available for your home or investment property. No commitment required.
Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. NCACPA — SSARS 21 Explainer
2. Fannie Mae — Appraiser Update, June 2024
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Legal disclosures. Lendmire (NMLS# 2371349) is a state-licensed mortgage brokerage that arranges financing through wholesale lender relationships. Lendmire is not a direct lender, depository institution, or registered financial advisor. The discussion above is general informational content about real estate financing — it is not financial, legal, or tax advice, and readers should consult licensed professionals for guidance on their individual circumstances. Loan inquiries are subject to lender underwriting; this article does not represent a commitment to lend. Loan terms, rates, and qualification standards vary by borrower, property, and state, and are subject to change at any time. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.
