The Quick Read: The right window follows your income trend. Twelve months suits income that has risen recently, while 24 months suits income that is seasonal, lumpy or steady over a longer record. Both windows qualify you on deposits after an expense ratio instead of traditional personal-income documentation, and on larger loans the window also affects which wholesale program reviews the file.
- Both windows are the same product family, set by lender guidelines. They are not two legal categories.
- Rising income usually favors 12 months. Uneven or seasonal income usually favors 24.
- Through select wholesale programs, the 24-month path tops out at $6,000,000, while 12-month files can run to $30,000,000, subject to full underwriting.
- Run both windows on your actual statements before you pick one.
Who Each Window Is Really For
The 12-month window is for the borrower whose business is growing and whose recent deposits tell the best story. Think of a founder whose revenue stepped up over the past year, or a physician who recently left a practice to open her own. The 24-month window is for the borrower whose income swings. An entertainer with project-based pay, a contractor with seasonal peaks, or an attorney who collects large fees in lumps will often look steadier over two years.
Neither window is the safer default. A longer record can calm an underwriter, and it can also drag your qualifying income toward older, lower months. Your statements decide, not a rule of thumb.
Side-by-Side
This table shows how the two windows differ in practice across the wholesale network. Every figure is a typical ceiling or range through select wholesale programs, subject to full underwriting and not a commitment to lend. Above $4,000,000, everything is reviewed case by case before submission.
| Factor | 12-Month Window | 24-Month Window |
|---|---|---|
| Qualification basis | Eligible deposits after expense ratio | Same, averaged over a longer span |
| Documentation | 12 consecutive statements | 24 consecutive statements |
| Best income pattern | Rising or recently stepped up | Seasonal, lumpy or steady |
| Program availability | Portfolio non-QM and bank portfolio | Portfolio non-QM program |
| Top loan size | $30,000,000, case by case above $4M | $6,000,000, case by case above $4M |
| Reserves | 3, 6 or 9 months by loan size | 3, 6 or 9 months by loan size |
| Property types | Set by program, not by window | Set by program, not by window |
| Entity vesting | Program-dependent | Program-dependent |
| Underwriter scrutiny | Fewer months, each one reviewed closely | More months, more deposits to explain |
The reserve and property rows match on purpose. Reserves scale with loan size, not with the number of statements. Property and entity rules belong to the program that reviews the file, and LLC vesting is available depending on program guidelines.
How Qualifying Income Is Built
Qualifying income is eligible deposits, minus an expense ratio, divided by the number of months in the window. The steps are the same for both windows.
1. Pick the account type. Statements can be personal or business. Business statements need at least 25% ownership.
2. Screen the deposits. Transfers between your own accounts, loan proceeds and one-time items are normally excluded. Transfers from your own business into a personal account count at 100% on the programs the network places.
3. Apply the expense ratio. Fixed ratios are 20% for a service business with no employees, 40% for one to five employees, and 50% for six or more employees or any product business. An accountant-provided ratio or a profit-and-loss method capped at 80% is the alternative. Scotsman Guide’s overview of non-QM lending describes the same setup, with a flat 50% factor as its example and a third-party profit-and-loss statement as the other route.
4. Divide by 12 or 24. The result is monthly qualifying income, which is tested against a debt-to-income limit of up to 50%.
Deposits are not income until they are screened. A borrower who sends $1 million through an account has not shown $1 million of earnings. The window changes how many months go into the average, and the expense ratio and deposit screening often move the number more than the window does.
When the 12-Month Window Is the Better Fit
Choose 12 months when your recent income is your strongest evidence. The shorter window drops older, lower months from the average, so qualifying income reflects where the business is now.
Picture a founder whose last 12 months of deposits ran about 20% above the 12 months before. A 24-month average blends in the weaker year and pulls the figure down. The 12-month calculation does not. That gap can be the difference between a larger loan amount and a smaller one.
The 12-month window also fits a few other situations:
- A recent business or role change. If you have been self-employed for a shorter stretch, you may not have 24 clean months of business deposits to offer.
- Very large balances. The bank portfolio program uses 12-month statements and carries files up to $30,000,000 on its own ladder. That is 65% to $5,000,000, 60% to $10,000,000 and 55% to $30,000,000, reviewed case by case above $4,000,000.
- Simple, recent paperwork. Twelve statements are fewer documents to assemble, and fewer deposits to explain.
The tradeoff is that one unusual month carries more weight. A single large deposit in a 12-month window moves the average more than it would across 24 months. Underwriters tend to look hard at it.
When the 24-Month Window Is the Better Fit
Choose 24 months when your income is uneven and a longer record shows the swings are normal. A seasonal business may have two strong quarters and two thin ones every year. Two years of statements shows that pattern repeating, and it keeps one weak stretch from defining the file.
Project-based earners often fit here. Say you are an entertainer or a consultant who is paid in large lumps. A single 12-month window might catch an unusually slow stretch. Across 24 months, the lumps average out into something an underwriter can read.
Steady income also works well in the 24-month window. If your deposits are close from one year to the next, you lose nothing by going longer, and the extra history can support the file. When the two years look alike, the choice is mostly about which program the loan size points to.
Know the limit going in. The 24-month path runs through the portfolio non-QM program, which carries files to $6,000,000. Above that size, the bank program’s 12-month statements are how the file is documented. The decision stops being yours.
What Changes at Jumbo Size
Jumbo means the loan exceeds the agency conforming limit. Orrick’s summary of the FHFA limits puts the baseline for a one-unit property at $832,750 and the high-cost ceiling at $1,249,125. Above that line there is no single national rulebook beyond each program’s published guidelines, so the window question gets tangled up with size.
Here is what shows up across the wholesale network as loan size climbs:
- Leverage steps down. On a primary residence purchase, ceilings run 90% to $1,000,000, 85% to $2,000,000, 80% to $3,000,000 and 75% to $4,000,000 at the top credit tier. Second homes and investment property run about five points lower at every size.
- The window does not set leverage. The loan size and occupancy do. A longer window does not buy you a higher ceiling.
- Above $4,000,000, case by case. Primary residence purchase ceilings of 65% to $5,000,000, 60% to $10,000,000 and 55% to $30,000,000 are reviewed individually before submission.
- Reserves rise with size. Expect 3 months to $500,000, 6 months to $1,500,000 and 9 months above that, plus 2 months for each additional financed property up to 12 months.
- Credit tightens. The floor is 660 on the portfolio program, 680 on the bank program, and 700 above the super-jumbo line.
- Overlays arrive. Above $3,500,000 on a primary residence, and $3,000,000 on a second home or investment property, the file picks up extra conditions. These include a 0x30x24 housing history, 48-month seasoning after any credit event, and cash-out proceeds that cannot count toward reserves.
- Cash-out has a cap. On the portfolio program, cash-in-hand is limited to $1,500,000 above 60% LTV. At or below 60% LTV, proceeds are unlimited. Final terms depend on the lender’s guidelines, the property type, and the borrower’s complete credit picture.
In practice, the jumbo question is rarely 12 versus 24 in isolation. It is which program fits your loan amount, and the window follows from that. Programs change, and every file is underwritten individually.
Edge Cases: Declining Income, Mixed Accounts, Short History
Declining income. A down year hurts in either window. The 12-month figure shows the low point directly. A 24-month average can look better on paper, but underwriters read the trend as well as the average, and a falling line is a red flag in both. If you are buying a rental, an investment property can instead be reviewed on property cash flow. That path qualifies primarily on property-level rental income covering the payment, subject to lender guidelines, so your personal deposits matter less. Lendmire’s comparison of a DSCR loan versus a bank statement loan for investors covers that choice.
Mixed personal and business accounts. Whether a program lets you combine them is program-specific. Business statements are gross revenue and take an expense ratio. Personal statements are read closer to face value, with more scrutiny that the deposits are real business income.
Short self-employment history. If you do not have two years of clean statements, a 24-month window is not available to you, and that settles the question.
Large single deposits. A 12-month window magnifies one big deposit. Expect a request for an explanation, and expect that unexplained money may be excluded.
Investor purchases. DSCR loans are designed for non-owner-occupied investment properties. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage.
If you are weighing windows for property held in an entity, Lendmire’s piece on how the 12-month and 24-month choice plays out when the loan is in an LLC goes deeper.
What Neither Window Skips
Bank statement loans are not no-documentation loans. They use different documentation, and you still need consecutive, complete statements. Transaction histories never substitute for statements.
Federal rules also still apply. The CFPB’s Ability-to-Repay regulation requires a reasonable, good-faith determination that a consumer-purpose borrower can repay the loan, and it does not lay out comprehensive underwriting standards. Nothing in it sets a 12-month or 24-month window. That is a program guideline, which is why the answer can differ from one program to the next.
Common Mistakes
- Picking the window before reviewing the statements. Run both calculations first and then decide.
- Assuming 24 months is always safer. With rising income it can cost you qualifying income.
- Treating total deposits as income. Screening, the expense ratio and ownership share all reduce the number.
- Ignoring size. A loan above $6,000,000 will not run on the 24-month path.
- Expecting a longer window to raise leverage. Leverage follows loan size, occupancy and credit.
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.
The Verdict
Use 12 months when your recent income is your strongest asset, when your self-employment record is short, or when the loan size sits in the bank program’s range. Use 24 months when your income swings and a longer record steadies the picture, provided the loan fits the portfolio program’s size.
When it is close, run both. The window rarely decides the outcome alone, because deposit screening, the expense ratio and the loan size usually move the file more. A broker who sees many programs’ guidelines can run each calculation against the programs that fit and show you where the numbers land. The complete DSCR loans guide covers the rental-property alternative.
Frequently Asked Questions
Can I choose between the 12-month and 24-month window?
Often, but not always. Whether both are on the table depends on the program and the loan size. Through select wholesale programs, 24 months is available to $6,000,000, while the bank program documents with 12 months. A broker can run both calculations on your statements and show you which programs fit.
Does the 24-month window always give higher qualifying income?
No. It gives a higher figure only when older months were as strong as recent ones or stronger. If your income has grown, the 24-month average pulls the figure down.
Does a longer window change leverage or reserves?
Not directly. Leverage follows loan size, occupancy and credit tier, and reserves of 3, 6 or 9 months follow loan size. Everything above $4,000,000 is reviewed case by case before submission.
What if my income dropped last year?
Expect questions in either window, because underwriters read the trend. A 12-month window shows the drop directly. If you are buying a rental, the property’s cash flow may carry the file instead, subject to lender guidelines.
Do personal statements work for a business owner?
Yes, on programs that accept them. Business statements need at least 25% ownership and take an expense ratio. Transfers from your own business into a personal account count in full.
Next Step
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. Consumer lending is licensed in 16 states: AL, CA, CO, FL, GA, IN, MI, MT, NM, NC, OH, PA, TN, TX, VA and WA. Lendmire is the broker that shops multiple wholesale programs, never the lender, and nothing here is a commitment to lend.
About Lendmire
Lendmire (NMLS# 2371349), a non-QM mortgage broker serving investors in 41 markets including Washington, D.C., helps structure DSCR scenarios commonly evaluated around a property’s rental income rather than personal income paperwork, subject to lender guidelines. A Scotsman Guide Top Mortgage Workplace in 2025 and 2026, Lendmire places loans through wholesale investor lenders and is not a direct lender.
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References
1. Scotsman Guide, Rev Up the Engine for Non-QM Lending
2. Orrick, FHFA Announces Increases to Conforming Loan Limits
3. CFPB, 12 CFR 1026.43 Minimum Standards for Transactions Secured by a Dwelling
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: Credit Score for Super Jumbo Bank Statement Cash-Out Refinance · Bank Statement HELOC vs Super Jumbo Bank Statement Loan for a Creative · Super Jumbo Bank Statement LTV on Purchase vs Cash-Out
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosure information. Lendmire is a state-licensed mortgage brokerage under NMLS# 2371349. Lendmire is not a depository institution, direct lender, or financial advisor — all loans referenced are placed through wholesale lender partners and are subject to each lender's underwriting standards. This article is provided for general informational purposes and is not a commitment to lend, nor does it constitute financial, legal, or tax advice. Loan programs, terms, rates, and qualification standards change without notice and depend on borrower profile, property type, and the state in which the subject property is located. Equal Housing Opportunity provider. NMLS Consumer Access: nmlsconsumeraccess.org.