When you apply for a bank statement loan as a self-employed borrower in Pennsylvania or Florida, lenders don’t use your tax returns to determine how much you qualify for. Instead, they analyze your bank deposits — and then apply what’s called an expense factor. This single percentage determines how much of your gross deposits actually counts as qualifying income. Understanding how expense factors work, which business structures face higher deductions, and how a CPA letter can override the default are the three decisions that most affect your loan amount.
What Is an Expense Factor in a Bank Statement Loan?
An expense factor is the percentage a lender deducts from your gross business bank statement deposits to estimate the net income available to service a mortgage. Lenders apply this deduction because business deposits don’t represent pure profit — some portion of every deposit covers operating costs: rent, payroll, cost of goods, software, insurance, and every other business expense.
The formula lenders use is straightforward:
Monthly Qualifying Income = Total Deposits ÷ Number of Months × (1 − Expense Factor %)
If you deposit $20,000 per month into a business account and the lender applies a 50% expense factor, your qualifying income is $10,000 per month — not $20,000. The lender assumes half of every deposit covers business expenses and counts only the remainder as income available to repay the loan.
Across non-QM lenders, expense factors typically range from 25% to 50% depending on your business structure and the lender’s program guidelines. Some lenders assign the factor by entity type; others allow a licensed CPA to override the default with a documented actual ratio.
One key distinction: personal bank statements carry no expense factor at all. If you use personal bank statements to qualify, 100% of your deposits count as qualifying income. This is why the choice between personal and business statements is one of the highest-leverage decisions in the pre-qualification process. See the full comparison at Personal vs Business Bank Statements.
How Expense Factors Are Applied: Three Worked Examples
The expense factor’s impact is easiest to understand through the actual numbers. These three examples illustrate how the deduction affects qualifying income across different business structures and strategies.
Example 1 — Sole Proprietor Using Business Statements at the Default Factor
- Monthly deposits (business account): $20,000
- Lender’s default expense factor: 50%
- Monthly qualifying income: $20,000 × (1 − 50%) = $10,000/month
- Annual qualifying income: $120,000
This is the baseline scenario for a sole proprietor who has not obtained a CPA letter. Half of every dollar deposited is assumed to cover business expenses. The lender qualifies the borrower at $10,000 per month regardless of actual business overhead.
Example 2 — LLC Owner Using a CPA Letter to Override the Default Factor
- Monthly deposits (business account): $20,000
- CPA-certified actual expense ratio: 35%
- Monthly qualifying income: $20,000 × (1 − 35%) = $13,000/month
- Annual qualifying income: $156,000
- Difference vs. default 50% factor: +$36,000/year in qualifying income
The same deposits, the same account, the same lender — but a CPA letter documenting actual expenses at 35% produces $36,000 more in annual qualifying income. At typical debt-to-income ratios, that additional qualifying income can translate to $80,000–$100,000 more in approved loan amount.
Example 3 — S-Corp Owner Using Personal Statements with No Expense Factor
- Monthly deposits (personal account, owner distributions): $18,000
- Expense factor: 0% (personal statements carry no deduction)
- Monthly qualifying income: $18,000 × (1 − 0%) = $18,000/month
- Annual qualifying income: $216,000
An S-corp owner who distributes profit to a personal account and uses personal bank statements to qualify avoids the expense factor entirely. Even with lower gross deposits than the business account, the absence of any deduction produces significantly higher qualifying income. Which approach wins depends on your deposit patterns and account structure — this is why running both calculations before choosing matters.
Expense Factor by Business Structure
Non-QM lenders assign default expense factors based on business entity type. The ranges below represent typical non-QM program parameters. Individual lender guidelines vary.
| Business Structure | Default Expense Factor Range | Notes |
|---|---|---|
| Sole proprietor | 25–50% | CPA letter can reduce; personal statements may avoid factor entirely |
| Single-member LLC (taxed as sole prop) | 25–50% | Same treatment as sole proprietor; disregarded entity for tax purposes |
| S-corporation | 25–40% | W-2 + K-1 option may bypass expense factor altogether |
| C-corporation | 30–50% | Less common for bank statement programs; higher overhead assumptions |
| Partnership | 30–50% | Factor varies significantly by lender and business type |
| Personal (any structure) | 0% | Full deposit count; no expense deduction applied |
S-corp owners face a factor range of 25–40% — lower than sole proprietors — because lenders recognize that S-corp distributions represent post-expense profit rather than gross revenue. Additionally, S-corp owners have a path that bypasses the expense factor entirely: if the borrower pays themselves a W-2 salary from the corporation, lenders may use the W-2 plus K-1 distributions to qualify without running business bank statements at all.
Sole proprietors and single-member LLCs face the widest factor range because their business and personal finances are legally commingled. Lenders apply more conservative defaults when the business boundary is less defined.
How to Override Your Expense Factor with a CPA Letter
Most non-QM lenders accept a letter from a licensed Certified Public Accountant as documentation of a business’s actual expense ratio. When accepted, the CPA’s certified ratio replaces the lender’s default — and qualifying income increases accordingly.
When a CPA Letter Is Worth Getting
The CPA letter produces the highest benefit when your actual business expenses are significantly below the lender’s default. Technology contractors, consultants, real estate agents, insurance agents, and professional service providers often have actual expenses of 15–35% while facing a 50% default. The math is direct: every percentage point of reduction on a $20,000/month deposit base adds $200/month in qualifying income.
Consider the impact of a 10-percentage-point reduction (50% → 40%) on $20,000 in monthly deposits:
- At 50% factor: $10,000/month qualifying income → $120,000/year
- At 40% factor: $12,000/month qualifying income → $144,000/year
- Difference: +$2,000/month, +$24,000/year
- At typical DTI ratios, this can add $80,000–$100,000 to your maximum approved loan amount
What the CPA Letter Must Include
For a CPA letter to be accepted by most non-QM lenders, it must contain:
- Business name — exactly as it appears on bank statements
- CPA’s name and license number — verifiable with the state CPA licensing board
- Actual expense ratio — stated as a percentage of gross revenue or deposits
- Period covered — matching the bank statement period used for qualification (12 or 24 months)
- CPA’s signature — original or clearly authenticated
Dynamic Funding Solutions provides the specific format requirements from the lender program being used so your CPA can draft a letter that meets underwriting standards on the first submission. See also 12-Month vs 24-Month Bank Statement Loan — the statement period affects both income averaging and the period the CPA letter must cover.
Which Lenders Accept CPA Letters
Most non-QM bank statement lenders accept CPA letters as an expense factor override. Some retail banks offering bank statement products do not — their programs use fixed factors with no override option. Working with a mortgage broker who accesses multiple non-QM lenders gives you the flexibility to choose a program that allows the override when it benefits your qualification.
Personal vs Business Bank Statements: Which Avoids the Expense Factor?
Personal bank statement programs carry no expense factor. Every dollar deposited into a personal account over the qualifying period counts as qualifying income. This makes personal statements the higher-qualifying option for any business owner who regularly transfers net profit to a personal account.
The decision framework:
- Personal statements win when: Net profit flows regularly to a personal account, personal deposits are a strong representation of actual income, and you want to avoid the expense factor deduction entirely
- Business statements win when: Business deposits are significantly larger than personal deposits, income stays in the business account, and a CPA letter can bring the expense factor below 50%
- The right answer depends on your numbers: Both calculations should be run before choosing a path
For a full side-by-side analysis with worked examples covering owner’s draw scenarios, S-corp salary structures, and sole proprietor patterns, see Personal vs Business Bank Statements: Which Qualifies You for More?
For self-employed borrowers in Pennsylvania specifically, the Self-Employed Mortgage Pennsylvania page covers program parameters, minimum deposit history, and credit requirements in full. Florida self-employed borrowers can review program specifics at Bank Statement Loan Florida.
Frequently Asked Questions About Expense Factors
What is an expense factor in a bank statement loan?
An expense factor is the percentage a lender deducts from your gross bank statement deposits to estimate your business’s net income. For example, if you deposit $20,000/month and the lender applies a 50% expense factor, your qualifying income is $10,000/month — the assumed net after business expenses.
How does an expense factor affect how much mortgage I qualify for?
It directly reduces your qualifying income, which reduces the loan amount you’re approved for. A borrower with $20,000/month in deposits qualifies for significantly more at a 25% expense factor ($15,000/month net) than at a 50% factor ($10,000/month net). The difference in maximum loan amount at those two income levels is substantial.
What expense factor do lenders use for sole proprietors?
Most non-QM lenders apply a 25–50% expense factor to sole proprietor business bank statements by default. The specific factor varies by lender and program. A CPA letter certifying your actual expense ratio can override the default and potentially increase your qualifying income.
Can a CPA letter change my expense factor?
Yes. A letter from a licensed CPA certifying your business’s actual expense ratio is accepted by most non-QM lenders as an override to the default expense factor. If your actual expenses are 35% of revenue, a CPA letter can increase qualifying income versus a lender’s default 50% factor. The letter must include the CPA’s license number, business name, actual expense percentage, and period covered.
Do personal bank statements have an expense factor?
No. Personal bank statement programs count 100% of deposits as qualifying income with no expense factor applied. This is why self-employed borrowers with personal accounts and minimal business overhead sometimes qualify for more using personal statements than business statements.
What expense factor applies to S-corp bank statements?
S-corp owners typically face a 25–40% expense factor on business bank statements. However, S-corp owners have additional options: lenders may also use W-2 income plus K-1 distributions, bypassing the bank statement expense factor altogether for higher qualification.
Get a Free Expense Factor Analysis
The expense factor is the single variable that most directly controls your qualifying income on a bank statement loan — and most borrowers don’t know they have options. Lena Polnet, NMLS #17225, reviews your bank statement deposit patterns, calculates qualifying income under multiple expense factor scenarios, and identifies whether a CPA letter would materially increase your loan amount before you apply.
Schedule a free 15-minute call to review your bank statements and calculate your qualifying income under different expense factor scenarios.
- Schedule online: calendly.com/lpolnet71/strategy_15min
- Phone: (215) 364-7171
- Email: lending_support@dynamicfunding.net
Dynamic Funding Solutions, NMLS #17144 | Licensed in Pennsylvania and Florida