How Much Qualifying Income Shifts Across Four Bank Statement Combinations

The Quick Read: The same borrower can show very different monthly qualifying income depending on two choices: personal or business statements, and a 12-month or 24-month window. In the model below, the best and worst combinations land 2.5 times apart. Business statements usually move the number more than the window does, because an expense factor trims business deposits before anything is averaged.

• Account type is the biggest lever. Business statements typically take an expense factor. Personal statements usually do not, though programs vary.
• The window matters when income is trending. A longer window helps a falling earner and hurts a rising one.
• The expense factor is lender-specific. An accountant-prepared expense statement can change it. The lender decides whether to accept it.
• Ownership share and deposit scrubbing come next. Both can cut the number before the window ever matters.
• The highest number is not always the usable one. The underwriter wants the figure the file can defend.

Most self-employed borrowers pick a combination by habit. A better move is to run all four and see what each one does. This article does that for one hypothetical borrower, then shows where the pattern breaks.

What Are the Four Combinations?

The four combinations come from crossing two choices. You pick a window (12 or 24 months of statements) and an account type (personal or business). Each pairing produces a different monthly figure from the same underlying cash flow.

Across the wholesale network Lendmire works with, 12 months of statements is the standard starting point. Some programs also offer a 24-month option. Scotsman Guide describes the same range: a self-employed borrower provides 12 to 24 months of personal or business bank statements, and a non-QM lender calculates income from them.

Non-QM means the loan sits outside the standard agency mortgage box. These are often called alt-doc loans because they use alternative documentation. The lender builds income from your deposits instead of your traditional personal-income documentation.

Here is the grid in formula form.

One caution on the personal rows. Many programs skip the business expense factor on personal statements. Some lenders apply their own adjustments anyway, so treat “no haircut” as the common pattern, not a promise.

Key Terms Defined

Qualifying income: The single monthly income figure a lender uses to judge whether you can carry the loan. On a bank statement file, it comes from your deposits.

Eligible deposits: Deposits that count as earnings. Transfers between your own accounts, loan proceeds, refunds, gifts and one-time asset sales usually come out.

Expense factor: The share of business deposits the lender assumes goes to running costs. Scotsman Guide gives 50% as an illustrative example when it describes averaging deposits. It is a common illustration, not a rule.

Ownership share: Your percentage of the business that owns the account. If you own part of it, only that part of the income is yours.

DTI (debt-to-income ratio): Your monthly obligations divided by your qualifying income. A smaller income figure pushes this ratio up.

Window: The number of consecutive months of statements the lender averages.

How Underwriting Builds the Number, Step by Step

Underwriters work through the same sequence on almost every file. Each step can shrink the figure, which is why the order matters.

1. Choose the window. It is 12 or 24 consecutive months. Most programs accept either, and a few limit the choice.

2. Choose the account type. Personal, business, or a blend where the program allows it.

3. Scrub the deposits. The underwriter removes anything that is not earnings. A large transfer from your savings is the classic example.

4. Apply the expense factor, business accounts only. Each lender sets its own default. A tax professional’s expense statement or profit-and-loss statement may support a different ratio, and the lender decides whether to accept it.

5. Apply ownership share. If the business account is not 100% yours, the figure is cut to your percentage. Expect to prove it with an operating agreement, a K-1 or an accountant’s letter.

6. Divide by the months in the window. The result is one monthly figure.

7. Run it through DTI. The figure is compared with your monthly obligations, along with credit, assets and reserves. Reserves commonly run around six months of the housing payment.

Notice what is missing. No step lets the lender simply take your word for the income. The lender must tie the figure to your actual deposits.

The Master Example: One Borrower, Four Answers

Here is a modeled borrower. Eligible deposits are not in dollars, because the pattern matters more than the amount. Index the most recent 12 months at 100 and the prior 12 months at 60. This borrower is on the rise. The business expense factor is a modeled 50%, matching the common illustration above, and the borrower owns the business fully.

The best and worst cells sit 2.5 times apart. Two levers create that gap. The expense haircut halves the business figures. The window then trims another 20% off the 24-month versions, because the weaker prior year pulls the average down.

This is a modeled illustration, not a market statistic or a promise of how any lender will treat a file. Real lenders use their own expense factors, and your numbers will differ.

What Moves the Number Most?

Account type usually moves the number more than the window does. A 50% haircut is a large, fixed cut. The window only shifts the figure by however much your income changed between the two years.

The window can match the haircut only in extreme cases. If the prior year’s deposits were near zero, a 24-month average lands at about half of the recent year. At that point the window effect equals a 50% haircut.

The flip point moves when the expense factor is lower. Say an accountant-prepared expense statement supports a modeled 30% factor. Business deposits would then be worth 70% of gross. Below that point the window is the bigger lever.

Ownership share works like a second haircut. A 60% owner of a business account keeps 60% of the already-trimmed figure. Deposit scrubbing is the quiet fifth lever. It can erase a spike that made a year look strong.

In rough order of impact, the levers are:

1. Account type, which decides whether a haircut applies at all.

2. The expense factor, whether the lender’s default or a documented ratio.

3. The window, which matters most when income is trending.

4. Ownership share.

5. Deposit scrubbing.

Which Combination Wins for Which Borrower?

The winning cell depends on the shape of your income, not just its size. Here are four modeled trajectories run through the same grid. The first figure in each cell is the monthly qualifying income index, with the same 50% modeled business factor.

A few readings stand out:

• Rising income favors the 12-month window. The shorter window drops the weaker prior year.
• Falling income favors 24 months on paper. In practice, underwriters run trend checks, so a decline shows up under either window. Expect a request for a letter of explanation, and be ready for the lender to lean toward the lower recent period.
• Steady or seasonal income makes the window nearly irrelevant. A 24-month window does smooth seasonal peaks and valleys, which can make the file easier to read.
• A spike disappears once the underwriter removes the one-time deposit. The 12-month window loses its apparent edge.

From Income to Debt Ratio

Qualifying income feeds DTI, so statement choice changes how much you can borrow. Take modeled monthly obligations indexed at 30 against the master example.

These ratios illustrate direction only. They are not program limits. The same obligations can look comfortable under one combination and unworkable under another.

This is why the spread matters for loan size. Programs in the network run from roughly $125,000 to $3,500,000. A smaller qualifying income can push the loan you want out of reach before leverage even comes into play.

Leverage still depends on the transaction and occupancy. Select lenders go up to 90% LTV on a primary-residence purchase or rate-and-term refinance. They go up to 80% LTV on an owner-occupied cash-out, and about 75% LTV on an investment-property cash-out. Investment purchases on bank statement documentation vary by lender. Qualifying income only decides whether the file clears; credit, reserves and the property decide where within those ranges it lands.

Occupancy also decides the paperwork. An owner-occupied file is a consumer mortgage with consumer disclosure rules. A bank statement loan on a non-owner-occupied rental, including a short-term rental, is a business-purpose loan and is exempt from those consumer disclosure rules.

Where the General Rule Breaks

The grid is a starting point. These edge cases change the answer.

Pass-through businesses. A contractor whose deposits are mostly subcontractor payments may need a higher effective expense factor. Some lenders exclude pass-through deposits entirely. Business statements can look strong and then shrink at the scrub step.

Commingled accounts. Many lenders will not accept a single account that mixes personal and business money. Some will, with a clear paper trail. Mixed accounts also raise the double-counting risk, since the same dollars can appear as a transfer and a deposit.

Businesses under 24 months old. A 24-month window may not be available. Lenders in this situation may weigh liquid assets and credit quality more heavily. The 12-month combinations carry the file by default.

Partial ownership. A 100% owner and a 40% owner with identical deposits get very different answers. Ownership proof becomes the deciding document.

Program variation. Each lender in a wholesale network follows its own program sheet. One lender’s default expense factor, window options and treatment of personal accounts can differ from the next. Seeing many programs at once is where a broker adds the most value.

The highest number is not always the usable one. If a file shows very high income under one cell and the deposit pattern does not support it, the underwriter will use the figure the documents defend.

Why Unexplained Deposits Don’t Count

Bank statement loans are not “no verification” loans. The federal Ability-to-Repay rule requires a lender to verify the income it relies on with reasonably reliable third-party records, per CFPB Regulation Z § 1026.43. The CFPB’s compliance guide adds that a creditor generally cannot rely on what consumers say about their income.

That is why deposits get scrubbed. Your statements are the verification, so the lender needs to confirm that each deposit is earnings. The rule does not set an expense factor, a 12-versus-24-month lookback or a personal-versus-business treatment. Those are program choices.

Do You Need This Product, or a DSCR Loan?

A bank statement loan builds a personal income number. A DSCR loan, short for debt service coverage ratio, qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. Scotsman Guide draws the same line, noting that an investor can qualify on property cash flow when rental cash flow equals or exceeds ongoing expenses.

Bank statement documentation fits when you want to be underwritten on your own deposits. A primary-residence purchase is the obvious case. It also fits when a rental’s rent does not carry the file by itself. If the property’s rent clears the payment, the DSCR path skips the whole deposit exercise. Lendmire’s complete DSCR loans guide covers how that side works.

Two related pieces cover deposit questions on the home equity side. One looks at how much rental deposit income qualifies for a bank statement HELOC. The other covers how much deposit income a business owner needs for a bank statement HELOC.

Common Mistakes

• Assuming 12 months always wins. It wins only when recent income is higher.
• Treating every deposit as income. Transfers and loan proceeds come out.
• Treating 50% as a law. It is a common default and illustration. A documented ratio may change it, subject to the lender.
• Mixing statement types without a plan. Pick the account that actually holds your business receipts.
• Ignoring ownership proof. Gather the operating agreement or K-1 before you ask for a comparison.
• Chasing the highest cell. The defensible number is the one that closes the file.

Tax treatment can depend on how the funds are used and how the property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.

Before You Ask for the Comparison

Gather these first so the loan officer can run all four combinations cleanly:

1. Twenty-four months of statements for every account you might use.

2. A list of any large or unusual deposits, with a note on each source.

3. Ownership documents for any business account.

4. An accountant-prepared expense statement or profit-and-loss statement, if you have one.

5. A monthly list of your current obligations, so DTI can be run alongside income.

Then total eligible deposits for each window yourself. Repeat for personal and business. You will see the four numbers before anyone else does.

Next Step

Lendmire is a broker that arranges financing through select lenders in its wholesale network, and its consumer mortgage licensing covers 16 states. Every file is underwritten individually, and nothing here is a commitment to lend.

About Lendmire

Lendmire (NMLS# 2371349) is a mortgage brokerage focused on DSCR investor financing, helping arrange programs through wholesale and investor-lending channels in 41 markets, including Washington, D.C. DSCR loans are evaluated by the lender on property cash flow rather than personal income, subject to lender guidelines, supporting LLC closings and accommodating investors with four or more financed properties. Lendmire was named a Scotsman Guide Top Mortgage Workplace in both 2025 and 2026.

References

1. Scotsman Guide, “Rev Up the Engine for Non-QM Lending”

2. Scotsman Guide, “These Loans Should Take Center Stage”

3. CFPB, Regulation Z § 1026.43 (Ability-to-Repay)

4. CFPB, ATR/QM Small Entity Compliance Guide