How the Bank Statement Loan Crediting Method Works for a Single Commingled Account

The Quick Read: When one account carries both personal and business money, a lender typically reads it as a business account, screens out every deposit that isn’t earned revenue, averages what remains, and then applies an expense factor to the whole account.

• Transfers between your own accounts, loan proceeds, refunds, and gifts usually come out before any averaging.
• The expense factor lands on personal-looking credits too, which is the real cost of commingling.
• Twelve months of statements is the common documentation window, and the lender sets the factor, not you.
• Owner-occupied bank statement files can reach up to 90% LTV on a primary-residence purchase or rate-term refinance, subject to lender guidelines.
• Cleaner separation before you apply usually raises credited income more than any argument made after the fact.

Most self-employed borrowers assume the lender simply adds up deposits. It doesn’t work that way. Lendmire, a DSCR-focused mortgage broker, places bank statement files through select lenders, and the crediting step is where mixed accounts gain or lose the most ground. This article walks through the sequence line by line.

Key Terms Defined

Commingled account: One checking account that receives both personal money and business revenue.

Crediting: The lender’s process of deciding which deposits count toward qualifying income and how much of each counts.

Eligible deposit: A credit that traces to the borrower’s own earned business or self-employment income.

Expense factor: The lender’s assumed share of deposits that went to operating costs, subtracted before income is credited.

Ownership proration: Crediting only the borrower’s percentage share of a business’s income when the borrower is not the sole owner.

What Does “Crediting” Actually Mean?

Crediting is the translation step between raw statements and a qualifying income number. It is reviewed on documented income under the applicable program, subject to lender guidelines. The lender is not trusting your total deposits. It is deciding which deposits it can defend as income.

No federal rule publishes a commingled-account formula. The 12-month window, the expense factor, and the treatment of mixed accounts are each program choices made by lenders and the investors who fund the loans. That is why two lenders can read the same statements and land on different numbers.

The Crediting Sequence, Step by Step

Here is how a typical underwriter works through a single mixed account. Each step is program-dependent.

1. Classify the account. Statements are sorted as personal, business, or commingled. A mixed account is usually pushed toward business treatment.

2. Collect the statements. Programs commonly ask for 12 consecutive months, every page, no gaps. Some require the full average to come from the same account.

3. Screen every credit. This is where commingling hurts most. Deposits tied to your own earnings stay. Everything else comes out.

4. Handle owner flows. Owner draws count once. Owner contributions are not income. Money that circles from personal to business and back can inflate deposits, and reviewers watch for that pattern.

5. Average the eligible deposits across the window.

6. Apply the expense factor to the whole account.

7. Prorate by ownership if you are not the sole owner. Many programs set an ownership floor.

8. Run the personal debt-to-income test with the new payment added to your other obligations.

In short: eligible deposits, averaged over the months, reduced by the expense factor, adjusted for ownership share.

What Gets Credited and What Gets Removed

Deposit screening exists because lenders must confirm that inflows are the borrower’s own income before relying on them. The CFPB ATR/QM guide v3.0 treats an unidentified deposit as a verification problem, with loan proceeds as the classic example. A transfer from your own savings looks exactly like income on a statement, so underwriters remove it.

Deposits also have to fit the business. A salon with many small tickets would not normally show a round, large credit, and that mismatch draws questions.

A Worked Example

These figures are invented to show the mechanics. They are not a program term or a quote.

Picture a freelance contractor whose single account shows about $480,000 in total credits over 12 months. The underwriter tags each line. Roughly a quarter of that total turns out to be transfers from the contractor’s own savings, a refund, a spouse’s deposit, and one insurance settlement. Those come out. The remaining client payments are averaged across the 12 months to produce a monthly eligible figure.

Then the expense factor applies to that eligible figure. The lender, not the borrower, sets the factor. A lower factor generally needs third-party support, such as a letter or profit-and-loss statement from a CPA or tax preparer. What remains is credited income, which goes into the personal debt-to-income test.

Notice what happened. The contractor never “lost” the spouse’s deposit by accident. It was never income. But because the factor hits the account as a whole, even clean personal-looking credits that stayed in carry the same reduction.

Why Lenders Treat Mixed Accounts Conservatively

A mixed account is hard to defend. The underwriter cannot tell by looking whether a credit is revenue or a personal deposit without a paper trail, so the default is the cautious classification: business treatment with the expense factor.

Here is where the market splits. Some lenders will read a personal account near face value, but only for deposits traced to work. Others reclassify a personal account that receives gross business receipts as commingled. And some programs won’t allow mixed accounts at all. Across a wholesale network, the pattern is consistent: the cleaner the paper trail, the more room a lender has to be flexible.

Flexibility on the factor matters. Scotsman Guide, “Don’t Shut the Door on Quality Borrowers” argues that a one-size-fits-all expense approach can wrongly deny borrowers with asset-heavy businesses. That reasoning is why a few lenders in a network will consider documented expenses instead of a flat assumption. Most programs still start from a lender-set default.

Where the General Rule Breaks

Multiple accounts. The same Scotsman Guide piece gives examples including a restaurateur with separate cash and card accounts and a physician’s office with separate insurance and patient accounts. It also warns that looking at only one account may not show a borrower’s full finances. Pooling is program-specific, and the same dollars can never count twice.

Down payment and reserves. Funds sitting in a commingled business account may be discounted by ownership share, or the lender may ask you to move them into a personal account first. Reserves on these files commonly run around six months of the housing payment.

Minority owners and joint accounts. Ownership proration and access letters apply when a non-borrower is on the account.

Seasonal or growing income. Twelve months captures growth. A longer window smooths seasonality. Some lenders weigh the better figure, though terms follow each program sheet.

Lender discretion. Factor treatment varies. If one lender’s flat treatment strangles your number, a different program may read the same statements differently.

Occupancy Decides the Rules

The property type changes the disclosure regime. An owner-occupied file, whether a primary residence or second home, is a consumer mortgage and carries consumer disclosure rules. A bank statement loan on a non-owner-occupied rental, including a short-term rental, is business-purpose and exempt from those consumer disclosure requirements. Short-term rental rules can vary by city, county, HOA, and property type, so investors should confirm local rules before relying on projected rental income.

Leverage: What the Crediting Number Buys

Credited income sets how big a payment your debt-to-income can carry, so a lower number shrinks purchase size before leverage even enters. On the leverage side, select lenders in Lendmire’s network typically allow:

• Up to 90% LTV on a primary-residence purchase or rate-term refinance, with the top of the range reserved for stronger files.
• Up to 80% LTV on an owner-occupied cash-out (primary or second home), using a fixed expense ratio, or 75% with an accountant-prepared ratio, by loan size and credit.
• Up to about 75% LTV on an investment-property cash-out.
• Investment purchases on bank statement documentation vary by lender.
• Loan amounts of roughly $125,000 to $3,500,000. Consumer licensing for this lane covers 16 states.

An alternative worth knowing: asset depletion, which qualifies from liquid assets, can reach about 80% LTV on a primary residence. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.

Options Compared

The last row deserves attention. A bank statement loan underwrites you. A DSCR loan reviews the property’s rent used for lender review against its payment. Many self-employed investors use bank statements for a primary residence and DSCR for each rental, partly because every financed property stacks onto personal debt-to-income in the bank statement lane. Lendmire’s complete DSCR loans guide covers that side in depth.

What Helps Your File

• Route business income into one account and move money out by transfer, so personal activity stays off the revenue account.
• Keep a transfer log tying large or unusual deposits to a source.
• Hold your down payment and reserves in a personal account.
• Pay personal expenses from the personal account, never from the revenue account.
• Gather ownership proof and, where relevant, access letters.
• Consider a CPA letter or P&L if you believe your true expenses run below the default.

Months matter. A few clean months usually help more than a long explanation of messy ones, though that is a pattern, not a promise. For related reading, Lendmire’s piece on the commingled account crediting method on personal vs business bank statements compares the two routes.

Common Mistakes

• Depositing personal windfalls, then expecting them to count.
• Moving money between your own accounts without a record.
• Assuming the expense factor is a federal rule. No regulator sets it.
• Assuming you can pick your own factor. The lender sets it; documentation can support a different one.
• Treating bank statements as stated income. Verification still applies, and unidentified deposits must be checked.
• Assuming every lender reads a mixed account alike.

Tax treatment varies; consult a qualified professional.

Qualification is subject to lender guidelines and is not a commitment to lend.

About Lendmire

Lendmire — NMLS# 2371349 — is a mortgage broker that arranges bank statement, P&L-only, 1099-only and asset-based home financing in 16 states through wholesale lenders, on primary residences, second homes and investment properties. Every option is subject to the lender’s guidelines and full underwriting. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB ATR/QM guide v3.0

2. Scotsman Guide, “Don’t Shut the Door on Quality Borrowers”