CPA Letter Change — The Quick Read: A CPA letter can lower the expense factor on a business bank statement loan, but the effect only applies to that program — not to a true 1099 income loan, which already runs on its own fixed, generally lower deduction. The two get confused constantly because both skip traditional personal-income documentation, but they calculate qualifying income in different ways.
A CPA letter changes the expense ratio applied to bank deposits on a bank statement loan, and it must come from a licensed preparer who has reviewed the business’s records. It does not touch a dedicated 1099 program’s built-in factor, because that program already uses its own fixed deduction instead of a deposit-based ratio.
Key Terms Defined
Expense ratio (or expense factor): the percentage of gross monthly deposits an underwriter assumes goes to business overhead before counting the rest as income.
CPA letter: a signed statement from a Certified Public Accountant, enrolled agent, or qualifying tax preparer certifying the business’s actual expense ratio, based on a review of its records and its most recent filed tax return.
Bank statement loan: a mortgage program that uses 12 or 24 months of deposit history instead of traditional personal-income documentation to calculate qualifying income.
1099 income program: a separate documentation path that uses Form 1099 records to verify income and applies its own fixed deduction, rather than a deposit-based expense ratio.
Qualifying income: the monthly figure an underwriter uses to size the loan, calculated as deposits minus the expense ratio (or, on a 1099 program, 1099 income minus its own fixed factor).
Two Different Programs, One Confusing Question
The question “does a CPA letter change the expense factor on a 1099 bank statement loan” actually blends two separate products. A bank statement loan looks at deposits and applies an expense ratio. A 1099 program looks at 1099 income and applies its own separate, generally lower fixed deduction. There’s no single hybrid “1099 bank statement loan” with one shared expense factor — a borrower picks one path or the other, and sometimes qualifies through both to see which produces the stronger number.
That distinction matters because a CPA letter only does anything on the bank statement side. If a self-employed borrower’s actual overhead is well below the deposit-based default, a letter can move that ratio down. If the same borrower is paid mostly through 1099s and their real expenses run above the 1099 program’s fixed factor, the bank statement path with a CPA letter often produces a better coverage figure — even though both programs skip traditional personal-income documentation entirely.
How the Expense Factor Math Really Moves
The math is simple: qualifying income equals average monthly deposits multiplied by one minus the expense ratio. Drop the ratio and the qualifying income rises — and the swing is bigger than most borrowers expect.
On our wholesale network, the fixed ratios we see most often on business bank statement files run in three tiers: a low tier for a service business with no employees, a mid tier for a business with one to five employees, and a top tier for a business with six or more employees or any business selling a physical product. A CPA-certified ratio can replace any of those tiers with a number that reflects the borrower’s actual books — and that number can move a lot. Cutting the assumed expense ratio significantly doesn’t just trim a few points off assumed overhead. Because the calculation runs against the remaining share of deposits, a meaningful cut in the ratio can substantially increase the qualifying income drawn from the same underlying deposit history. The letter exists precisely for this reason: it corrects a flat assumption that may not reflect a low-overhead consultant, agent, or advisory practice at all.
The reverse is also true. Nothing forces the certified number down — a CPA letter states the business’s real ratio, and in a handful of documented cases that ratio has landed above the standard 50% default rather than below it. The letter’s job is accuracy, not automatic relief.
What a CPA Letter Actually Has to Contain
An usable letter isn’t a one-line note. Underwriters generally expect it to identify the preparer by name and license or credential number, state a specific certified expense-ratio percentage, confirm the preparer reviewed the business’s financial records and prepared or filed its most recent business tax return, and carry a signature and date. Most programs in our network want that letter dated within about 120 days of the application — an older letter tends to get kicked back for a refresh.
There’s also a floor. Across the programs Lendmire places files with, the lowest ratio a CPA letter can typically certify sits around 10%. No program we’ve seen will accept a certified ratio below that, regardless of how thin the borrower’s actual overhead runs.
None of this happens automatically. An underwriter still reviews whether the certified number holds up against the file — a letter supports a lower ratio, it doesn’t override the file’s own reasonableness check.
When the Letter Is Worth the Trouble — and When It Isn’t
The letter pays off when there’s real daylight between actual overhead and the program’s default. If a business genuinely runs close to a 47% expense ratio and the standard is 50%, paying for a CPA letter to shave three points isn’t worth the cost or the delay. The letter earns its keep when the gap runs 25 points or more — a low-overhead consultant certified at 20% instead of defaulting to a 50% ratio is a different qualifying income entirely.
Professional-services and advisory jobs tend to see the biggest lift. Attorneys, accountants, management consultants, IT consultants, and financial advisors typically carry overhead well under the standard tiers. Real estate agents fit a similar pattern. They have heavy marketing, MLS, and errors-and-omissions insurance costs. A flat 50% assumption sometimes misreads these costs when the agent’s actual spend runs lower.
Commingled accounts complicate all of this. When business revenue and personal transfers aren’t clearly separated, programs tend to apply a more conservative ratio regardless of what a letter says. This happens simply because the deposit history itself is harder to isolate. Keeping business and personal accounts distinct well before applying makes the whole calculation cleaner — letter or no letter.
For a step-by-step comparison of how the letter interacts with the expense factor on a 1099-earner’s file specifically, Lendmire’s breakdown of expense factor vs. CPA letter for 1099 earners walks through the documentation side in more depth. And for borrowers weighing whether the letter is worth pursuing at all, this look at whether a CPA letter can lower the expense factor lays out the same threshold from the other direction.
No federal formula sets any of these percentages. The Consumer Financial Protection Bureau’s Ability-to-Repay standard says a lender must document a borrower’s income, assets, and expenses. But it doesn’t name a specific expense-ratio number. The CFPB’s own commentary confirms this: a profit-and-loss statement reviewed by a third-party accountant counts as an acceptable third-party record under §1026.43(b)(13)(i). Separately, current CFPB guidance confirms the rule requires documentation and reasonableness, not a fixed percentage. The specific ratio is a program-by-program underwriting convention, not a regulatory mandate.
Where This Question Stops Mattering: DSCR Loans
For an investor buying rental property rather than a home to live in, the entire expense-factor question can disappear. DSCR loans qualify mainly on whether the property’s rental income covers the monthly payment, subject to lender guidelines. They don’t rely on the borrower’s personal deposits, 1099s, or traditional income documentation. DSCR loans are business-purpose investor loans, so they’re reviewed differently than a standard owner-occupied mortgage. Personal expense ratios simply don’t enter the file.
That makes DSCR the more direct path for a self-employed investor whose bank statement math gets complicated by high write-offs, commingled accounts, or a business type where the default ratio doesn’t reflect reality. If the subject property’s rent covers the payment, the borrower’s own deposit history and expense factor become far less relevant to that specific purchase. That said, credit, reserves, and entity documents (for an LLC purchase) still matter.
The expense-factor question keeps mattering in some cases, even for an investor. This happens anywhere personal income still feeds into the file — for example, a portfolio guarantor also seeking a personal-purpose loan, a blended DSCR/full-doc structure, or a borrower cross-qualifying on both a rental purchase and a personal residence at the same time. In those cases, the CPA letter’s swing on qualifying income flows straight into the maximum loan amount available on the personal side of the file. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.
Across our wholesale network, super-jumbo bank statement financing runs from $300,000 up to $6,000,000 on a portfolio non-QM program, with a separate bank portfolio program carrying twelve-month-statement files as high as $30,000,000 on its own ladder — 65% leverage to $5,000,000, 60% to $10,000,000, and 55% at the top of the range, with interest-only capped at 60% or the band’s ceiling, whichever is lower. Leverage on a primary residence purchase can run as high as 90% at the smallest loan sizes, stepping down as the loan size climbs — 85% around $2,000,000, 80% around $3,000,000, and case-by-case review above $4,000,000. Second homes and investment properties generally run about five points lower at every size tier. Reserve requirements scale with loan size too, typically three months up to $500,000, six months up to $1,500,000, and nine months above that. None of these figures is a promise — every file is reviewed individually against the borrower’s full picture, and terms are available through select wholesale programs, subject to full underwriting.
Consumer bank statement mortgage lending through Lendmire is currently licensed in 16 states — Alabama, California, Colorado, Florida, Georgia, Indiana, Michigan, Montana, New Mexico, North Carolina, Ohio, Pennsylvania, Tennessee, Texas, Virginia, and Washington. DSCR investor loan programs reach a wider footprint. They’re arranged through select lenders across 40 markets, including Washington, D.C.
For a full walkthrough of how DSCR lender review works property-by-property, Lendmire’s complete DSCR loans guide covers the mechanics in more depth than fits here.
Common Misconceptions
“1099 loan” and “bank statement loan” use the same expense mechanism. They don’t. A 1099 program applies its own fixed deduction directly to 1099 earnings; a bank statement program applies a separate ratio to gross deposits. Borrowers with significant deductions often do better on bank statements with a CPA letter; borrowers whose 1099 income is close to their actual take-home often do better on the 1099 path.
Any accountant’s note works. It doesn’t. The letter needs to come from a CPA, enrolled agent, or a properly credentialed tax preparer who has actually reviewed the business’s records and its most recent filed return — a self-prepared profit-and-loss statement without that review isn’t the same document.
The expense ratio is a federal rule. It’s a non-QM underwriting convention that individual lenders set, not something Regulation Z or any other federal standard dictates.
This is not tax or legal advice, and program terms discussed above can change or vary by lender. Investors should speak with a qualified CPA or attorney about how any of this applies to their specific business structure and tax filings before making a financing decision.
Frequently Asked Questions
Can a CPA letter raise the expense ratio instead of lowering it? Yes. The letter certifies the business’s actual overhead, and in some documented files that number has landed above the standard 50% default rather than below it. The point of the letter is accuracy to the business, not automatic relief.
Is there a limit to how low a CPA-certified ratio can go? Most programs in Lendmire’s network won’t accept a certified ratio below roughly 10%, no matter how thin the business’s real overhead runs.
Does a CPA letter help on a 1099 program? Generally, no. A dedicated 1099 program already applies its own fixed deduction to 1099 earnings rather than a deposit-based ratio, so there’s no expense-ratio field for a letter to change on that specific program.
Do I need a CPA letter for a DSCR rental property loan? Typically not. DSCR loans qualify primarily on the property’s rental income covering the payment, subject to lender guidelines, so personal expense ratios and CPA letters usually don’t factor into that file at all.
What if my accounts mix business and personal deposits? Commingled deposits tend to push underwriters toward a more conservative ratio regardless of a CPA letter, since separating true business revenue from personal transfers gets harder. Keeping accounts separate before applying tends to produce a cleaner, more favorable calculation.
Are you weighing whether a bank statement file or a DSCR purchase makes more sense for an upcoming rental acquisition? Lendmire can help you compare the options. This comparison looks at the property’s income, your credit profile, available leverage, and your broader goals. Reach the team at 828-256-2183 or request a quote directly through Lendmire’s site to see how a specific file lines up against current wholesale-network guidelines.
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
As a DSCR and non-QM mortgage broker, Lendmire — NMLS# 2371349 — connects investors with wholesale lending channels across 40 markets, including Washington, D.C. The property’s rental income, not the borrower’s tax returns, is central to lender review, which works for self-employed operators and portfolios beyond four financed properties. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. CFPB — Ability-to-Repay Final Rule Interpretations
2. CFPB — Regulation 1026.43 (current)
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.
