Choose 12 Vs 24 Months — The Quick Read: The choice comes down to your income trend, not a preference. If your deposits have grown recently, 12 months usually produces a higher coverage figure because the leaner older months drop out. If your income is flat, seasonal, or coming off a strong prior year, 24 months often smooths the picture and can qualify you for more. A good loan officer runs both calculations before picking one — you should expect the same.
Key Takeaways
- The 12-month window isolates your most recent, strongest period; the 24-month window averages two full years together.
- Business account deposits get discounted by an expense factor before they count as income — personal account deposits usually count closer to full value.
- Declining income shows up under either window; underwriters run trend checks regardless of which period you submit.
- At larger loan sizes, a longer deposit history can carry more weight with underwriters than a bigger single-year number.
- Investors buying a straight rental property often skip this decision entirely by qualifying on the property’s rent instead of personal deposits.
Key Terms Defined
Bank statement loan — a mortgage that qualifies a self-employed borrower using bank deposits instead of traditional personal-income documentation or W-2s.
Expense factor — the percentage a lender subtracts from business deposits to estimate what’s left over after operating costs.
Non-QM (non-qualified mortgage) — a loan that sits outside the government’s standard mortgage rulebook, letting lenders use alternative income documentation.
DSCR (debt service coverage ratio) — a ratio that measures whether a rental property’s income covers its own monthly housing payment.
Interest-only period — a stretch of the loan term where the payment covers only interest, not principal, which can lower the qualifying payment on paper.
Is Your Income Rising, Flat, or Falling?
This is the entire decision. Rising income favors the 12-month window. Flat or seasonal income often favors 24 months. Falling income is a red flag under either window, and no amount of window-shopping fixes it.
Picture a consultant whose deposits grew sharply over the past year compared to the year before. Running only the trailing 12 months captures that growth in full. Running 24 months blends the stronger recent year with the weaker prior one, dragging the average down. In that case, 12 months produces the better qualifying picture.
Now flip it. A contractor had a strong first year and a softer second year — maybe a slow winter, a delayed project, a client that paid late. The trailing 12 months alone shows only the softer year. Stretching the window to 24 months pulls the stronger year back into the average, which can raise the qualifying figure. This is really the only scenario where 24 months tends to outperform 12 — when the older year was better than the recent one and the underlying business is still sound.
Underwriters don’t just take whichever number is bigger and move on, either. They run a trend check across both windows looking for a negative slope — a business that’s shrinking quarter over quarter raises questions no matter which period you submit.
How the Math Actually Works
The calculation is simple once you see it: total eligible deposits, divided by the number of statement months, after an expense factor is applied to business account deposits. Personal account deposits typically don’t take that haircut.
Across the wholesale bank-statement programs Lendmire places files with, lenders usually reduce business deposits by a fixed expense factor before counting them. This is commonly 20% for a service business with no employees, 40% for a small team of one to five people, and 50% for larger staffed businesses or any product-based business. Some lenders will accept an accountant-prepared letter showing a lower actual expense ratio. A few will use a profit-and-loss method instead, capped around 80% of stated income. Underwriters also remove anything that isn’t real income before averaging — this includes transfers between your own accounts, one-time deposits like a tax refund, loan proceeds, and gifts.
One detail trips up a lot of borrowers: money moved from a business account into a personal account, if it’s the borrower’s own business, generally counts at full value on most files. That’s a meaningfully different outcome than running the same dollars through the business account and taking a 50% haircut. If you control both accounts, how you move money matters as much as how much you make.
Business Account vs. Personal Account
Account type changes the math more than the length of the window does. Personal deposits count near full value; business deposits get discounted by an expense factor before they’re usable as qualifying income.
A borrower who pays themselves a regular owner’s draw into a personal account, and documents that personal account, often qualifies for more than a borrower with identical take-home pay who instead documents straight from the business account. The gap comes entirely from the expense factor, not the underlying income. This is worth sorting out before you gather statements — swapping which account you submit can move your coverage figure more than switching from 12 to 24 months ever will.
What About Seasonal or Uneven Income?
Seasonal income doesn’t automatically point to one window over the other — it depends on whether the seasonality is consistent year to year. A landscaper, a tax preparer, or a wedding photographer with a predictable slow season generally benefits from 24 months, because it captures a full cycle rather than catching them mid-slump. Twelve months submitted right after the slow season can understate real earning capacity; 24 months absorbs both the peak and the valley into one steadier average.
Where Loan Size Changes the Calculus
Loan size shifts the conversation from “which number is bigger” to “which history looks more credible.” At larger amounts, a longer, cleaner deposit history often does more underwriting work than a single strong year.
Across the wholesale network Lendmire works with, bank statement mortgages typically run from $300,000 up to $30,000,000 through two separate program ladders — a portfolio non-QM program carrying to roughly $6,000,000, and a bank-portfolio program that carries 12-month-statement files as high as $30,000,000 on its own leverage schedule (65% to $5,000,000, stepping to 60% to $10,000,000, and 55% to $30,000,000, generally interest-only at 60% or the tier ceiling, whichever is lower). On a primary residence, leverage typically steps down as the loan gets bigger — up to roughly 90% at the smallest sizes, tightening toward 75% around the $3,000,000 to $4,000,000 range for borrowers in the strongest credit tier, with everything above that reviewed case by case before submission. Second homes and investment properties generally run about five points lower in leverage at every size band on most files.
This is where documentation length starts to matter beyond the raw numbers. On a file pushing toward the higher tiers, a full two years of consistent deposits at the qualifying level can carry more weight with an underwriter than 12 strong-but-thin months — even if the 12-month number technically comes out higher. Above roughly $3,500,000 on a primary residence (or $3,000,000 on a second home or investment property), overlays generally tighten further. This commonly means a 700 credit floor, a 48-month seasoning period after any past credit event, and no non-occupant co-borrowers. As always, this is subject to underwriting on every file.
Documentation itself doesn’t change: most programs still want 12 or 24 consecutive statement months, business statements generally require at least 25% ownership in the entity, credit floors typically run around 660 on the portfolio program (680 on the bank program), debt-to-income up to roughly 50%, and reserves that scale with loan size — commonly three months up to $500,000, six months up to $1,500,000, and nine months above that, plus additional reserves per financed rental property. None of this is a guarantee of approval; it reflects typical guidelines on select wholesale programs, subject to full underwriting on every file.
Lendmire’s complete DSCR loans guide walks through how a property-income loan differs from this kind of personal-deposit underwriting, which matters for the next section.
Bank Statement Loans vs. DSCR Loans for a Rental Purchase
If you’re buying a straight rental property rather than a primary residence, the 12-vs-24 decision may not need to happen at all. A DSCR loan is reviewed primarily on the property’s own rental income covering its payment, subject to lender guidelines, rather than on your personal deposit history.
DSCR loans are made for investment properties you don’t live in. They are business-purpose loans, so lenders review them differently from a standard owner-occupied mortgage. This means you don’t need to show personal income documents. Instead, lenders qualify you based on the property’s income — not your bank statements, traditional income papers, or W-2s.
This matters directly if you’ve been stressing over which account or time window helps your bank-statement math. If the property itself brings in enough rent to comfortably cover its own payment — often shown as a coverage ratio around 1.0x to 1.25x on the strongest files — the 12-vs-24-month question becomes irrelevant for that purchase. Some programs in Lendmire’s network will still review files with coverage below that range. No-ratio qualification is also available through select lenders in the network, with leverage and terms set by that specific program. Cash-out on a DSCR refinance is generally capped around 70% loan-to-value for short-term-rental properties and 75% for standard long-term rentals. This is subject to lender guidelines and program eligibility, and it applies to loans titled to an LLC or other entity.
Entity flexibility is a real difference worth understanding. Personal-income products — like bank statement loans and bank-statement-based home equity lines — generally require the property to be titled to you personally or to a revocable living trust, not an LLC. DSCR loans work differently: they routinely allow you to hold the property in an entity. This is one reason investors scaling a rental portfolio often move away from personal-deposit documentation entirely once they’re buying pure rentals rather than a home they’ll live in.
For a deep dive on the same 12-vs-24 decision applied to a higher-leverage bank statement file, Lendmire’s guide on the super jumbo bank statement program covers how the choice plays out at larger loan sizes. And for borrowers weighing this exact question on a second home rather than a primary residence, Lendmire’s second-home bank statement breakdown walks through how the occupancy type shifts the leverage available.
What Can Go Wrong
The most common mistake isn’t picking the wrong window — it’s picking the wrong account type, or not realizing a CPA letter could have lowered the expense factor before submission. A borrower who documents a business account with a default 50% expense factor, when a service business with no employees might have qualified for a 20% factor with an accountant’s letter, can leave real qualifying income on the table regardless of whether they chose 12 or 24 months.
Declining income is the other trap. Some borrowers assume the 12-month window hides a bad recent stretch by defaulting to 24 months. It doesn’t. Underwriters test the trend across both periods, and a business that’s shrinking will show up as a concern either way — the fix is addressing the decline, not the documentation window.
Commingled accounts cause slowdowns, too. If personal and business deposits mix in the same account, sorting out what actually counts as income takes longer and can require more documentation than a clean, separated account structure.
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.
This article is for general informational purposes and isn’t legal or tax advice. Speak with a qualified attorney or CPA about how any of this applies to your own situation before making a financing decision.
For deeper background on the mechanics discussed here, see CFPB – What is the ability-to-repay rule.
Frequently Asked Questions
Does choosing 12 months instead of 24 months change my interest rate? No — the window you choose affects your qualifying income calculation, not your pricing. Rate and terms depend on your credit profile, leverage, and the specific program, and those factors are handled separately from the documentation window during underwriting.
Can I submit both 12 and 24 months and let the lender pick? Many loan officers do exactly this. Running both calculations before selecting a program is standard practice on most bank statement files, since it costs nothing extra to compare and can reveal which window actually produces the stronger coverage figure for your specific deposit pattern.
What if my personal and business accounts are commingled? It complicates the calculation. Underwriters need to separate real income from internal transfers, and commingled accounts often require more documentation or a CPA letter to sort out what should and shouldn’t count.
Does a shorter self-employment history rule out the 12-month option? Not necessarily. Some programs will consider a shorter self-employment history if the borrower has prior W-2 experience in the same line of work, though this varies by lender and typically comes with stronger compensating factors like a higher credit score or larger down payment.
Is a bank statement loan the same as a no-income-verification loan? No. These are fully underwritten alternative-documentation loans; the borrower is reviewed on documented income under the applicable program, subject to lender guidelines. Deposits are screened for irregularities, and declining-income and missing-statement checks apply regardless of which window is used, per the kind of automated review tools non-QM underwriters commonly rely on (Ocrolus).
Are you deciding between a bank statement mortgage and a DSCR loan for an investment property purchase? Lendmire can help. We’ll show you how the property’s rental income, your credit profile, and your leverage options compare to personal-deposit qualification. That way, you can decide which path fits your file before you commit.
For current guidelines and terms, see Lendmire’s super jumbo bank statement loan programs page.
Self-employed borrowers can compare both super jumbo programs on Lendmire’s self-employed mortgages page.
About Lendmire
Lendmire is a non-QM mortgage brokerage (NMLS# 2371349) arranging DSCR investor loans in 40 markets, including Washington, D.C., through wholesale and investor-lending channels. DSCR loans are evaluated by the lender on rental income rather than personal income, subject to lender guidelines — a fit for LLC-owned portfolios, self-employed investors, and operators scaling beyond conventional loan caps. Recognized as a Scotsman Guide Top Mortgage Workplace in 2025 and 2026.
Lendmire’s Top Mortgage Workplace recognition is documented by Scotsman Guide 2025 Top Mortgage Workplace and Scotsman Guide 2026 Top Mortgage Workplace.
Get Started
Ready to find the right loan for you?
In about 30 seconds you can review financing options available for your home or investment property. No commitment required.
Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. CFPB – What is the ability-to-repay rule
2. Ocrolus — Non-QM Underwriting Income Calculator
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Required disclosures. Lendmire (NMLS# 2371349) operates as a licensed mortgage broker, not a direct lender or depository. The discussion in this article is general in nature and should not be relied upon as financial, legal, or tax advice — every investment scenario is unique and should be reviewed by a qualified professional. Any loan inquiry is subject to lender underwriting, and this article is not a commitment to lend or a guarantee of approval. Mortgage rates, loan terms, and program guidelines vary by borrower, property, and state, and may change without notice. Equal Housing Opportunity. Verify licensure at NMLS Consumer Access.
