Expense Factor Vs CPA Letter On A Bank — The Quick Read: A bank statement loan starts every 1099 borrower at the same place — a default expense factor, often 50%, cut against gross deposits before qualifying income gets calculated. A CPA letter is the tool that replaces that default with a documented, real-world figure, which can raise qualifying income substantially for a borrower whose actual overhead runs lower than the assumed cut. Neither one is automatically better — it depends on the borrower’s real expense ratio, the account type used, and how much documentation they’re willing to gather.
For a 1099 earner buying a home, refinancing, or building a portfolio on personal income instead of traditional personal-income documentation, this single underwriting choice can swing qualifying income by tens of thousands of dollars a year. Getting it right matters more than most borrowers realize.
Key Terms Defined
Expense factor — the percentage of gross bank deposits a lender assumes goes to business costs before counting the rest as qualifying income.
CPA letter — a signed document from a licensed accountant certifying a borrower’s actual expense ratio, based on tax records or a profit-and-loss statement, used to override the lender’s default assumption.
1099 earner — a self-employed worker or independent contractor who receives Form 1099 instead of a W-2, and typically reports income and expenses on Schedule C of Form 1040.
Qualifying income — the monthly income figure a lender actually uses to calculate debt-to-income ratio, after deposits are averaged and the expense factor (or CPA-documented ratio) is applied.
Bank statement loan — a non-QM mortgage program that uses deposit history instead of traditional personal-income documentation to establish income, common among self-employed and 1099 borrowers whose write-offs make their tax-return income look smaller than it is.
Why This Choice Exists At All
A 1099 earner’s tax return often understates real cash flow. Independent contractors report income as nonemployee compensation and net it against business expenses on Schedule C, and legitimate deductions — software, equipment, professional services — shrink the bottom line without shrinking what the borrower actually spends and saves each month. Bank statement underwriting exists to close that gap, and the expense factor is the mechanism that keeps the math honest without a full tax-return review.
The catch is that a flat expense factor assumes every business type spends the same share of revenue on overhead. A consultant working from a laptop and a landscaper running a fleet of trucks get treated identically under the default — until a CPA letter steps in to correct it.
Side-by-Side
| Factor | Standard Expense Factor | CPA Letter |
|---|---|---|
| Review basis | Fixed assumption applied to gross deposits | Documented, business-specific ratio |
| Documentation | Bank statements only | Bank statements plus signed CPA certification, often with tax records or a P&L |
| Best fit | Product businesses, staffed operations, higher real overhead | Service businesses, solo operators, low fixed costs |
| Timeline described qualitatively | Ready immediately with statements on file | Requires coordination with an accountant before submission |
| Reserve expectations | Same reserve requirements either way | Same reserve requirements either way |
| Effect on qualifying income | Conservative, sometimes understates real cash flow | Can raise qualifying income meaningfully when real costs are lower |
Neither column changes the reserve math or the credit-score floor a lender applies — those stay constant. What moves is the qualifying income number that feeds debt-to-income.
When the Standard Expense Factor Is the Better Fit
The default ratio is the right call when a borrower’s real overhead is close to — or higher than — what the lender already assumes. Chasing a CPA letter in that scenario wastes time and can even backfire if the accountant’s honest number lands above the default.
Businesses with employees, inventory, or equipment tend to fall here. A retail operation, a contracting business with a crew, or any company carrying real payroll and materials costs often runs true expenses near or above 50% of revenue. In those cases, a fixed 40% ratio (for a business with one to five employees) or 50% ratio (six or more employees, or any product-based business) already reflects the type of file it is, without extra paperwork.
There’s also a coordination cost to weigh. A CPA letter means engaging an accountant, gathering tax records or a profit-and-loss statement, and waiting on a signature before the file can move forward. If the default ratio already produces enough qualifying income to hit the target loan amount, adding that step accomplishes nothing.
When a CPA Letter Is the Better Fit
A CPA letter proves its worth when a borrower’s real expense ratio sits meaningfully below the lender’s default. This is common among low-overhead, service-based 1099 earners. A consultant, a solo attorney, a freelance designer, or a commission-based sales professional often has true costs well under 50% of gross revenue. A documented ratio can unlock qualifying income that the default ratio would otherwise leave on the table.
Select lenders in Lendmire’s wholesale network typically calculate business-account income using a fixed ratio. This ratio depends on business type: 20% for a service business with no employees, 40% for one with one to five employees, and 50% for six or more employees or any product business. Borrowers can also use an accountant-provided ratio instead of these fixed bands. Many files also allow a profit-and-loss method, capped at 80% of deposits counted as income. A CPA letter supports the accountant-provided path. It works because it replaces an assumption with a fact drawn from the borrower’s own records.
One detail worth knowing: money the borrower transfers from their own business account into a personal account is typically counted at 100%, not discounted by any expense factor at all. For a 1099 earner who runs a simple sole-proprietorship and moves earnings straight into a personal account, that routing decision — personal versus business statements — can matter as much as the CPA letter itself.
The tradeoff is documentation. A CPA letter takes time to arrange, requires a licensed accountant’s signature, and only helps if the certified ratio is genuinely lower than the default — a CPA cannot inflate the number or promise future income, only certify what the historical records show.
The 1099 Wrinkle Most Borrowers Miss
A 1099 form shows gross payments, not profit — and that distinction is exactly why the expense-factor conversation exists. The IRS treats independent contractors as self-employed, reporting income and deductions on Schedule C, which means the number on a 1099 and the number that ends up as taxable profit are rarely the same. A borrower depositing a healthy stream of gross 1099 income each month might have real expenses closer to 20% than 50% — and without a CPA letter, that gap never gets corrected on the loan file.
This works differently from how a true rental-property loan handles income. A DSCR loan is built around a property’s own rental income, not the owner’s personal earnings. It sidesteps the expense-factor conversation entirely, because the qualifying figure comes from the lease or market rent — not personal bank deposits. For contrast, conventional lenders sometimes document comparable rents on a Fannie Mae Form 1007 rent schedule. But DSCR programs use their own income methods, separate from that framework. Are you weighing whether to qualify personally on 1099 income or on a property’s rent alone? You can compare the mechanics in Lendmire’s complete DSCR loans guide.
What Getting This Wrong Costs
Qualifying income already gets discounted before lenders calculate debt-to-income. So a misapplied expense factor causes problems fast. A 15 to 20 percentage-point swing between a default ratio and a documented one changes qualifying income directly. That number then sets a cap. It limits how much loan amount a borrower can get. It also limits their debt-to-income headroom — across every property they’re financing, not just the one they’re buying now.
That’s especially relevant for a 1099 earner building a rental portfolio while also carrying personal financing on a primary or second home. If the file is routed to the wrong account type, or the default ratio gets applied when a CPA letter would have documented something lower, the borrower’s personal debt-to-income can look tighter than it actually is — narrowing what they can carry across the rest of their holdings.
The Program Realities Behind Either Path
Across Lendmire’s wholesale network, bank statement programs for high-income 1099 and self-employed borrowers span a wide range — loan amounts from $300,000 up through $30,000,000, split across a portfolio non-QM program that runs to about $6,000,000 and a separate bank-portfolio jumbo program that carries twelve-month-statement files on its own leverage ladder above that size. Underwriters typically ask for 12 or 24 consecutive months of statements, and business accounts need at least 25% ownership to count.
Leverage steps down as loan size climbs. On a primary residence, purchases through select lenders in the network can run as high as 90% at smaller loan amounts, tapering to roughly 65-60% territory once a file crosses into the multimillion-dollar range — every file above $4,000,000 gets reviewed case by case before submission, not offered as a flat percentage. Credit-score expectations tighten the same way: a 660 floor is typical on the portfolio program, 680 on the bank program, and 700 once a loan crosses into super-jumbo territory. Reserve requirements run roughly three months of payments on smaller loans, stepping up to six and then nine months as loan size grows, plus additional months for each other financed property in the borrower’s portfolio.
None of these figures are guarantees — every file still goes through full underwriting, and program guidelines are subject to change. Lendmire arranges these loans through select lenders in its wholesale network, with consumer mortgage licensing spanning 16 states.
Investors may wonder if a CPA letter can replace the expense factor on their file. Or they may want to know exactly how a CPA letter affects the expense factor calculation. You can check whether the expense factor can be replaced with a CPA letter and look at the mechanics before you decide which route to take.
Frequently Asked Questions
Can I get a CPA letter if my accountant didn’t prepare my taxes? Yes, but it takes more coordination. The accountant still needs access to your tax records or a profit-and-loss statement to certify an accurate ratio — a CPA can’t sign off on numbers they haven’t reviewed, so gathering documentation early avoids delays.
Does a CPA letter ever hurt my qualifying income? It can, if your real expense ratio turns out higher than the lender’s default. A CPA letter certifies facts, not favorable assumptions — if a landscaping or retail business genuinely spends 55% of revenue on costs, a documented letter could land above the standard 50% cut rather than below it.
Do personal and business bank statements get treated the same way? No. Business statements are the ones subject to the expense-factor conversation, since they show gross business revenue. Personal statements, and money transferred from a borrower’s own business account into a personal one, are typically counted differently — often closer to full value rather than discounted by a fixed ratio.
Is a 1099 income program different from a bank statement loan? Yes. A 1099-based program qualifies off the 1099 forms themselves rather than deposit history, which can work better when 1099 income is close to actual gross earnings. A bank statement loan, paired with a CPA-documented expense ratio, tends to work better when a business has real, legitimate deductions that make gross income look far higher than net.
Does the expense factor apply to DSCR loans on rental property? No. DSCR loans qualify primarily on the property’s rental income covering its payment, subject to lender guidelines — personal bank deposits, traditional personal-income documentation, and expense ratios aren’t part of that calculation at all, since it’s a business-purpose investment loan rather than a personal-income mortgage.
This article is for general information only and isn’t legal or tax advice. Anyone weighing expense-factor documentation, business structure, or how a 1099 filing affects a specific loan file should talk with a qualified CPA or attorney about their own situation.
Are you a 1099 earner? You might be deciding between a documented expense ratio, a straight bank statement file, or a DSCR loan on a rental property. Lendmire can help you compare these options. We’ll look at your income documentation, credit profile, leverage, and what you’re trying to finance.
For current guidelines and terms, see Lendmire’s super jumbo bank statement loan programs page.
About Lendmire
Lendmire is a non-QM mortgage brokerage (NMLS# 2371349) arranging DSCR investor loans in 40 markets, including Washington, D.C. DSCR eligibility is generally reviewed around property-level rental income rather than personal income, subject to lender and program guidelines, a fit for self-employed investors and LLC-owned portfolios. Lendmire was recognized as a Scotsman Guide Top Mortgage Workplace in 2025 and 2026.
Lendmire’s Top Mortgage Workplace recognition is documented by Scotsman Guide 2025 Top Mortgage Workplace and Scotsman Guide 2026 Top Mortgage Workplace.
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References
1. IRS — Form 1099-NEC and Independent Contractors FAQ
2. Fannie Mae — Single-Family Comparable Rent Schedule (Form 1007)
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosure information. Lendmire is a state-licensed mortgage brokerage under NMLS# 2371349. Lendmire is not a depository institution, direct lender, or financial advisor — all loans referenced are placed through wholesale lender partners and are subject to each lender's underwriting standards. This article is provided for general informational purposes and is not a commitment to lend, nor does it constitute financial, legal, or tax advice. Loan programs, terms, rates, and qualification standards change without notice and depend on borrower profile, property type, and the state in which the subject property is located. Equal Housing Opportunity provider. NMLS Consumer Access: nmlsconsumeraccess.org.
