How a Lender Applies the Expense Factor to 1099 Bank Statements

The Quick Read: A lender totals the eligible deposits in your statements, divides by the number of months, and then keeps only a share of that average as qualifying income. The share it removes is the expense factor, and the program sets it, not you.

• Transfers, loan proceeds, refunds, and unexplained deposits come out before any averaging.
• Business statements usually take a factor, while personal statements usually take little or none.
• A CPA-prepared ratio can replace the default, and it can lower income as easily as raise it.
• The resulting number feeds your debt-to-income test, which decides how much house you can buy.

A 1099 earner usually has a tax return that understates real cash flow. Write-offs shrink the bottom line, and a conventional underwriter works from that smaller number. A bank statement program looks at deposits instead. That sounds generous, but the expense factor is how the lender gives back the cost of doing business. Here is how it works, step by step.

What Is the Expense Factor?

The expense factor is a percentage the lender subtracts from your average monthly deposits to estimate what you actually keep. Deposits are revenue. Qualifying income needs to look like profit. The factor bridges the two.

No federal rule sets a number. The federal consumer-finance regulator’s repayment-capacity small entity compliance guide says a creditor must consider eight factors, with current or reasonably expected income or assets first. It also says the creditor must verify what it relies on using reasonably reliable third-party records. Bank statements are exactly that kind of record. How much of each deposit counts is left to the lender’s own method.

So the factor is a lender and program overlay. Across the wholesale network Lendmire works with, no two programs treat it identically, which is why comparing qualifying income matters more than comparing product names.

How Does Underwriting Apply It, Step by Step?

Underwriting follows the same five-step order on nearly every file. Only the details change by program.

1. Pick the statement window. Lendmire’s bank-statement lane typically runs on 12 months of business or personal statements. Some programs in the market use 24.

2. Strip out non-income deposits. Transfers between your own accounts, loan proceeds, refunds, gifts, and one-time unexplained deposits are removed. Large or odd deposits need a written explanation.

3. Average what remains. Total the eligible deposits and divide by the months in the window.

4. Apply the factor. Eligible deposits divided by months, multiplied by one minus the factor, equals monthly qualifying income. A 50% factor counts half the average deposit. A 20% factor counts four-fifths. Same deposits, very different income.

5. Run the debt-to-income test. The proposed housing payment plus other monthly debts are divided by that qualifying income.

Notice the order. The exclusions come first, so a messy account hurts twice: it lowers the average, then the factor trims what is left.

Key Terms Defined

Eligible deposits: Deposits that trace to your work, after transfers, loan proceeds, refunds, and gifts are removed.

Expense factor: The percentage of average deposits the lender treats as business cost rather than income.

Qualifying income: The monthly figure left after the factor, used to calculate debt-to-income.

Ownership share: Your percentage of the business, which some programs use to limit how much of a business account’s deposits count toward you.

CPA-prepared ratio: An expense ratio documented by an accountant or tax preparer that a program may accept in place of its default.

What Decides Which Factor Applies?

Five inputs drive the factor, and the borrower controls only some of them.

On the brokerage’s own pages, a service business with no employees sits near the low end, a service business with a few employees sits in the middle, and larger staffs or product-based businesses sit near the top. Those are network illustrations, not promises. Every file is underwritten individually, and a specific factor is never guaranteed in advance.

Personal or Business Statements?

Personal statements usually take little or no factor, but only deposits that trace to your work count. Business statements usually take a factor because not every deposit is profit.

That makes personal accounts look better on paper. The catch is commingling. If client payments, your spouse’s paycheck, and transfers all land in one account, the lender must untangle them, and what it cannot trace gets excluded. Some programs also add ownership or account-use tests on top.

The practical rule: if you already deposit 1099 payments into a personal account and keep the rest of your money separate, personal statements often produce the cleaner number. If income flows through an entity, business statements are usually the honest path, and the factor is the price of that.

1099 Forms, Bank Statements, or Platform Income?

A 1099-only program takes your gross 1099 income and applies a program-set adjustment, with no deposit analysis. A bank statement program uses deposits and a business-type factor. Which wins depends on how close your 1099 totals are to your real gross.

Entity-paid income often breaks a 1099-only file, because the forms may not show up in your name. Platform and payment-app income deserves a second look too. Deposits from those sources can be eligible, but lenders may want to see they are recurring work income and not transfers or reimbursements. Whether a particular program accepts that income is a lender-level question.

When Does a CPA Letter Help, Hurt, or Do Nothing?

A documented ratio helps only when your real expenses run below the default factor. It hurts when they run above it, and it often changes nothing for personal-account deposits.

Picture a consultant with almost no overhead depositing into a business account. A CPA ratio well under the default raises qualifying income. Now picture a contractor with materials, subs, and vehicles. The CPA’s honest ratio may exceed the default and drop the number.

For owner-occupied cash-out on a primary residence, the program uses a fixed expense ratio, and an accountant-prepared ratio can support a lower ceiling of 75% LTV rather than 80%. Check which structure fits before ordering the letter. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.

How Sensitive Is the Number?

Very. The table below uses a labeled hypothetical: assume the same average monthly deposits under three illustrative factors. These are modeling assumptions, not program terms.

Moving from the low case to the high case cuts qualifying income by more than a third on identical deposits. Since debt-to-income divides by that income, the same house can pass in one program and fail in another. That is the whole reason to shop the method, not the label.

Where the General Rule Breaks

Several edge cases bend the five-step sequence.

• Assets get hit too. Some programs apply a factor to business-account funds used for down payment, closing costs, or reserves. Partners may be limited to their ownership share of the balance. This is not universal, so ask before you move money.
• Volatile or declining deposits. A falling trend, overdrafts, and returned items can reduce income or sink the file. Lenders read the direction, not just the average.
• Withdrawal cross-checks. If you claim a low expense ratio, some lenders compare it to recurring withdrawals in the statements.
• Investment properties. A bank-statement loan on a non-owner-occupied rental is business-purpose, so it follows a different disclosure path than an owner-occupied file. Investment cash-out tops out around 75% LTV, and investment purchase leverage varies by lender.

Bank Statements or DSCR for a Rental?

If the factor makes personal debt-to-income too tight, a DSCR loan may be the better route for a rental purchase. A DSCR loan tests the property’s rent against its own payment and generally does not review personal debt-to-income, so no expense factor touches your deposits.

Bank statement files generally count your personal DTI. That is the trade. Bank statements suit a primary residence or second home. DSCR suits a pure rental. For the full picture, the complete DSCR loans guide walks through how that product is reviewed. Sub-1.00 coverage programs exist through select lenders, though leverage and terms adjust.

What Can Shrink Your Number?

• Commingled personal and business money.
• Spiky deposits that look like one-off events.
• Unexplained transfers and loan proceeds.
• A business ownership share below the program minimum.
• Withdrawals that contradict the stated expense ratio.

Prepare Before You Apply

Clean deposits before you apply, not after. Label transfers, keep personal and business money apart, and write down the source of any large deposit. Pick the statement window that shows your strongest steady stretch. Then compare programs on qualifying income, because the factor method varies. Bank statement loans qualify on documented income under the applicable program, subject to lender guidelines. Typical file parameters include loan sizes of roughly $125,000 to $3,500,000 and reserves around six months of the housing payment, with primary-residence purchase and rate-term leverage reaching up to 90% LTV through select lenders.

Tax treatment varies; consult a qualified professional before relying on any deduction. This article is general education, not legal or tax advice, so speak with an attorney or CPA about your own situation.

If you are self-employed and want to see how the numbers work, Lendmire can help you compare bank statement loan options based on your deposits, the property, credit profile, leverage, and your goals. Reach the team at 828-256-2183.

For deeper background on the mechanics discussed here, see CFPB ATR/QM Guide (2016).

About Lendmire

Lendmire (NMLS# 2371349) is a mortgage brokerage serving self-employed and high-net-worth borrowers in 16 states. Bank statement, P&L-only, 1099-only and asset-based mortgages are arranged through wholesale lending channels; Lendmire brokers the financing and the lender underwrites each application. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB ATR/QM Small Entity Compliance Guide

2. CFPB ATR/QM Guide (2016)