The Quick Read: Twelve months of statements usually favors a borrower whose deposits are rising, while twenty-four months usually favors a borrower whose income is steady or seasonal. The lender totals eligible deposits, applies an expense ratio to business accounts, and divides by the number of months in the window. The window can move qualifying income by a meaningful amount, so it often decides whether a large file works.
- Rising income: twelve months drops the leaner older year from the average.
- Steady or seasonal income: twenty-four months smooths the peaks and valleys.
- Some programs fix the window. The bank portfolio program uses twelve, so the choice is not always yours.
- Above $4,000,000, every file is reviewed case by case before submission.
- Qualification runs on documented deposits or assets, subject to lender guidelines, not on traditional personal-income documentation.
The honest answer is that neither window is better in the abstract. Founders, physicians, attorneys and other high earners whose traditional personal-income documentation understates cash flow should run both calculations against their own deposits. The stronger number wins, as long as the program allows the window. Across the wholesale network Lendmire works with, the real question is often which program fits the file. Programs differ on the window they accept, and a few lenders review the long window more closely at very large sizes.
Side-by-Side
The table shows published industry norms for each window, alongside program details from select wholesale programs. Pricing is deliberately left out. Pricing depends on the full file and lives in the quote process.
| Factor | Twelve months | Twenty-four months |
|---|---|---|
| Review basis | Eligible deposits ÷ 12, after expense ratio | Eligible deposits ÷ 24, after expense ratio |
| Documentation | One year of consecutive statements | Two years of consecutive statements |
| Income trend | Rewards recent growth | Rewards steady or lumpy income |
| Seasonality | Less smoothing | More smoothing |
| Business history | Works with a shorter record | Needs two full years |
| Program availability | Portfolio non-QM and bank portfolio programs | Portfolio non-QM program |
| Entity vesting | Business statements need at least 25% ownership | Same ownership test, over more months |
| Reserves | 3, 6 or 9 months by loan size | Same, by loan size |
| Underwriting review | Each month carries more weight | More deposits to screen |
| Timeline | Less paperwork to gather | More paperwork to gather |
The “Program availability” row reflects what select wholesale programs publish. Industry norms vary, and every file is underwritten individually. Neither window waives reserves, credit or the property review.
How the Lender Turns Statements Into a Number
Lenders in this space follow a similar sequence, and the window only changes the last division. Scotsman Guide describes the typical setup: a self-employed borrower supplies twelve to twenty-four months of personal or business statements, and the lender applies a standard expense factor to business deposits. It also notes that a profit-and-loss statement prepared by a third-party tax professional can serve as an alternative.
The steps run like this:
1. Choose the account set: personal, business, or both.
2. Remove transfers between the borrower’s own accounts, loan proceeds and one-time deposits.
3. Apply the expense ratio to business deposits.
4. Count only the borrower’s ownership share.
5. Divide eligible deposits by the months in the window.
6. Compare the result to the monthly obligations and run the rest of the file.
Across the wholesale network, the expense ratio is the lever people forget. Fixed ratios tied to business size and type are common, with lower ratios for service businesses with no employees and higher ratios for businesses with more employees or any product business, and an accountant-provided ratio may be allowed. A profit-and-loss method is capped at 80%.
When Twelve Months Is the Better Fit
Twelve months fits the borrower whose income has recently stepped up. Picture a surgeon who joined a practice partnership partway through last year. The older months were lean, and the newer months show the real run rate. A twenty-four-month average would drag qualifying income down toward the earlier, lower figures. The twelve-month window drops them.
It also fits a business younger than two full years, a borrower who changed banks, or a file with one unusually weak prior year. The lender sees a shorter record, so the stability story rests on fewer months. Because each month carries more weight, one large or odd deposit also matters more.
The bank portfolio program, which carries files up to $30,000,000, uses twelve months. For a borrower at that size, the window decision may already be made. Its leverage ladder is 65% to $5,000,000, 60% to $10,000,000 and 55% to $30,000,000, with interest-only at 60% or the band’s ceiling, whichever is lower. Those are ceilings through select wholesale programs, subject to full underwriting, and loans above $4,000,000 are reviewed case by case before submission.
The flip point: if income is rising but the rise comes from one large deposit that cannot be explained as ongoing business, twelve months can backfire. Expect a letter of explanation.
When Twenty-Four Months Is the Better Fit
Twenty-four months fits steady, seasonal or lumpy income. Consider a developer or a seasonal business owner whose strong quarters and slow quarters cancel out over two years. A single year might catch a trough. Two years show the full cycle, and a longer record gives the reviewer more confidence in the pattern.
It also helps when the most recent year includes an unusual dip that does not reflect the business. Averaging across two years can soften one bad stretch.
The tradeoff is paperwork and exposure. Twice the statements means twice the deposits to screen for transfers, loan proceeds and unexplained items. The CFPB’s ability-to-repay compliance guide says a creditor generally must verify the information it relies on using reasonably reliable third-party records, and statements the borrower prepared do not qualify. In practice that means clean statements matter. It also means a longer window gives the reviewer more places to find a question.
Declining income is the real danger. A twenty-four-month average can sit above recent performance, so reviewers may scrutinize the downward trend. Where income is falling, twelve months would show the lower number, and neither window hides the trend.
Super Jumbo Size Changes the Choice
At super jumbo size, the program often matters more than the window. Lendmire arranges these files through two wholesale programs. A portfolio non-QM program carries loans to $6,000,000 and offers twelve or twenty-four months. A bank portfolio jumbo program carries twelve-month-statement files to $30,000,000. The bank ladder begins above $4,000,000, so the two overlap to $6,000,000, and above $6,000,000 the bank program stands alone.
Leverage steps down as loans grow. On a primary residence, through select wholesale programs and subject to full underwriting, the ceiling is 90% to $1,000,000, 85% to $2,000,000, 80% to $3,000,000, and 75% at the top credit tier to $4,000,000. Beyond that, files are reviewed case by case. Second homes and investment property generally run about five points lower at each size.
Overlays tighten too. Above $3,500,000 on a primary residence, and above $3,000,000 on a second home or investment property, the programs want a 700 credit floor, a clean housing history, and no rural property. Cash-out proceeds cannot satisfy reserves. Reserves run 3, 6 or 9 months depending on size.
(Strong deposits cannot offset a weak overlay, so check program fit before you argue about the window.)
Edge Cases and Messy Files
Only twelve months available. A business under two years old, or a recent restart, may only support twelve months. Scotsman Guide points to asset-based qualification for asset-rich borrowers whose income history is short. Across the network, the asset allowance divides liquid assets by 36, 60 or 84 months. Assets-only needs liquidity equal to the loan plus costs.
Commingled accounts. If personal and business activity blur together, the screening gets harder. A CPA-prepared profit-and-loss method may be cleaner. A profit-and-loss the borrower writes does not count as a third-party record.
Account changes. Statements must be consecutive. Transaction histories do not substitute for them. A bank switch mid-window means gathering both sets without gaps.
One-time windfalls. A property sale or a large transfer will be removed. In a twelve-month window, one removed deposit shifts the average more than it would in twenty-four.
Mixed trends. If the numbers come out close, lean toward the longer record unless a lender in the network only accepts the shorter one. Closeness is itself a signal to examine the trend, not just the average.
A Practical Way to Decide
Run both calculations on your own deposits before choosing. The method takes four steps:
1. Pull twenty-four consecutive months and mark every transfer, loan advance and one-time deposit.
2. Total the clean deposits for the most recent twelve months and for all twenty-four.
3. Apply your expense ratio to the business share and divide by twelve and by twenty-four.
4. Compare both to the monthly obligation you expect, then check which program allows each window.
If the twelve-month result is clearly stronger and the growth is explainable, use twelve. If the two are close, twenty-four gives a steadier story. If twenty-four wins only because an old strong stretch is propping it up, expect questions about the recent trend. This is a genuine toss-up for some files, which is why the comparison belongs before any application.
Investors with several rentals have another option. A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines, so it skips the personal-income question entirely. The bank-statement route suits a borrower whose personal deposits are strong but whose rents are thin. For the full picture, see Lendmire’s complete DSCR loans guide.
Documents for Each Window
For either window, expect these: consecutive personal or business statements, proof of at least 25% ownership for business accounts, a letter of explanation for large or unusual deposits, and proof of reserves. Twenty-four months adds a longer list of statements and usually more explanation letters. Twelve months adds less paperwork but leaves less room for an anomaly.
Lendmire’s piece How Lenders Choose Between Twelve and Twenty-Four Bank Statements covers that side of the decision.
Key Terms Defined
Eligible deposits: Deposits left after transfers, loan proceeds and one-time items are removed.
Expense ratio: The share of business deposits treated as operating cost before income is counted.
Statement window: The number of consecutive months, twelve or twenty-four, used to average deposits.
Asset allowance: A path that adds liquid assets, divided over a set number of months, to qualifying income.
The Verdict
Choose twelve months when income is rising, the business is under two years old, or the older year was an outlier. Choose twenty-four when income is steady or seasonal and you want the longer record to carry weight. When income is falling, neither window helps much, and an asset path may serve better. Tax treatment can depend on how the funds are used and how the property is held. Keep clear records and speak with a qualified tax professional.
If you are financing a high-balance property on business or personal bank statements and want to see how the numbers work, Lendmire can help you compare super jumbo bank statement loan options based on your deposits, the property, credit profile, leverage, and your goals. Reach the team at 828-256-2183. Nothing here is a commitment to lend.
Frequently Asked Questions
Can I choose either window on any super jumbo loan?
Not always. The portfolio non-QM program offers twelve or twenty-four months, while the bank portfolio program uses twelve. The window is a program feature, so it depends on which program fits your file.
Which window gives a higher qualifying income?
It depends on the trend. Rising deposits tend to produce a higher figure over twelve months. Flat or seasonal deposits produce similar figures, and a recent dip can make twenty-four months look better.
Does the window change the expense ratio?
No. The ratio is set by the program and your business type, with fixed options of 20%, 40% or 50%, or an accountant-provided ratio. The window only changes how many months of deposits are averaged.
What if I only have twelve months of history?
Twelve months may work if the program allows it. An asset-based path can also support borrowers with short income history, subject to lender guidelines.
Do all deposits count?
No. Transfers between your own accounts, loan proceeds and one-time or unexplained deposits are generally removed. Business-to-personal transfers are reviewed against the business statements, subject to lender guidelines.
Lendmire’s self-employed mortgages page presents both super jumbo programs, portfolio non-QM and bank portfolio, side by side.
About Lendmire
Lendmire — NMLS# 2371349 — is a mortgage brokerage specializing in DSCR investor loans, helping arrange financing across 41 markets, including Washington, D.C., through wholesale and investor-lending channels. The model centers on property-level rental income reviewed by the lender rather than W-2 documentation, subject to lender guidelines, suiting entity-owned and multi-property investors. Lendmire holds Scotsman Guide Top Mortgage Workplace recognition for 2025 and 2026.
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References
1. Scotsman Guide: Rev Up the Engine for Non-QM Lending
2. CFPB Ability-to-Repay/Qualified Mortgage Small Entity Compliance Guide
3. Scotsman Guide: Helping Borrowers Fit the Boxes by Getting Hands-On With Non-QM
This article is part of Lendmire’s super jumbo bank statement loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Should an HNW Executive Use IO on a Super Jumbo Bank Statement Loan? · Super Jumbo Bank Statement Loan vs Bank ARM After a Company Sale · How Many Months of Reserves Does a 40-Year Super Jumbo Bank Statement Loan Require?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Legal disclosures. Lendmire (NMLS# 2371349) is a state-licensed mortgage brokerage that arranges financing through wholesale lender relationships. Lendmire is not a direct lender, depository institution, or registered financial advisor. The discussion above is general informational content about real estate financing — it is not financial, legal, or tax advice, and readers should consult licensed professionals for guidance on their individual circumstances. Loan inquiries are subject to lender underwriting; this article does not represent a commitment to lend. Loan terms, rates, and qualification standards vary by borrower, property, and state, and are subject to change at any time. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.