Bank Statement Loan Requirements: 12 vs. 24 Months of Deposits

The Quick Read: A 12-month window usually fits borrowers whose income is rising or whose recent year is the strongest, while a 24-month window usually fits borrowers whose income is seasonal, lumpy, or steady, though the lender’s program often decides the window and not you. In either case, the lender averages your eligible deposits, removes items that are not income, and applies an expense factor to business accounts.

• Neither window is a legal standard. Each lender or investor sets its own, and some programs offer both.
• The Lendmire network’s bank statement documentation starts with 12 months of statements, business or personal.
• Deposit quality and the expense factor often move qualifying income more than the window does.
• Owner-occupied files are consumer mortgages. A bank statement loan on a rental is a business-purpose loan.
• Qualification runs on documented income under the applicable program, subject to lender guidelines.

Here is the honest answer on who each option is for. Twelve months is for the borrower with a strong recent stretch, a growing business, or a clean, consistent year. Twenty-four months is for the borrower whose income swings by season, or whose best months sit further back and who wants a long, steady record to show. If your income is flat, the two windows tend to land in the same place, and the choice matters little. This article refers to the two options as the 12-month window and the 24-month window, and it explains how a broker who places these files across many lenders thinks about each.

For the wider picture of how these loans fit next to investor financing, see Lendmire’s complete DSCR loans guide.

Side-by-Side

The 24-month column below reflects published industry norms, since windows are set program by program.

Timing for either option depends on how quickly you can assemble clean statements and answer questions about deposits. Neither window promises a faster or slower path on its own.

How Deposits Become Qualifying Income

A bank statement loan is a non-QM product. Non-QM means the loan sits outside the standard rules that define a qualified mortgage. Scotsman Guide describes the typical scenario as 12 to 24 months of bank statements, from a personal account, a business account, or a mix. The same piece notes that lenders want consistent monthly deposits.

The process runs the same way under either window:

1. Gather the statements. They must be consecutive and complete, with no missing pages.

2. Screen the deposits. Underwriters remove transfers between your own accounts, loan proceeds, and one-time items that are not income.

3. Apply the account treatment. Business statements get an expense factor. Personal statements usually do not, but the deposits must trace to business income. If you own only part of the business, your ownership share applies.

4. Average over the window. The eligible total is divided by the number of months, 12 or 24.

5. Run the debt-to-income math, then review credit, reserves, appraisal, and title like any fully underwritten loan.

Lenders must still document what they rely on. The CFPB’s compliance guide on ability-to-repay says a lender must verify the income or assets it uses. Bank statements are that verification. They are not a waiver of it.

Across Lendmire’s wholesale network, expense factors vary by lender and by file. Some programs let an accountant-prepared expense ratio replace the default. No one should promise you a specific factor before a lender reviews your statements.

When the 12-Month Window Is the Better Fit

Twelve months wins when your recent stretch is your best stretch. Picture a contractor who landed larger jobs over the last year. A 24-month average would blend the quieter earlier months with the strong recent ones. A 12-month average isolates the period that reflects where the business stands today.

It also helps in these situations:

• A newer business. If you have a year of clean statements but not two, 12 months may be the only window you can meet. Many programs also look for about two years of self-employment history, so confirm that separately from statement length.
• A clean, consistent year. Steady deposits with few oddities leave less to explain.
• Less paperwork. Twelve statements per account is simpler than twenty-four, and fewer accounts to reconcile means fewer questions.

The Lendmire network’s bank statement documentation is built on 12 months. On a primary residence, purchase and rate-term files can reach up to 90% LTV through select lenders, and stronger files earn the top of that range. Loan sizes run roughly $125,000 to $3,500,000, and reserves commonly sit around 6 months of the housing payment. All of this is subject to lender guidelines.

The trade-off is that a short window has no cushion. One bad month, a large unexplained deposit, or an overdraft carries more weight across 12 statements than across 24.

When the 24-Month Window Is the Better Fit

Twenty-four months wins when your income moves around. A seasonal business can misstate itself badly in a 12-month window that starts in the off-season. A full annual cycle matters, and two cycles smooth the picture further.

Say you run a landscaping company with revenue packed into spring and summer. A window that catches one full cycle can work. Two cycles show the pattern repeats, which supports the stability argument for the lender.

Twenty-four months also fits:

• Lumpy income. Project-based work, with big deposits some months and small ones in others, averages out over a longer record.
• Steady income. If your deposits barely change year to year, the longer window costs you nothing and shows a long track record.
• Borrowers who want the long record on the file. A longer history can strengthen the stability case, though it does not guarantee a result.

The cost is real. A longer window can pull a strong recent year down toward the average, and more months means more review. If income has fallen, the older, higher stretch can flatter you in a 24-month average, but an underwriter will notice the decline and read the trend, not just the number.

What Moves the Number More Than the Window

Many borrowers fixate on the window. In practice, three other levers often matter more.

Deposit screening. Every dollar removed as a transfer or one-time item shrinks the average, whatever the window. Keep business and personal money separate.

The expense factor. On business accounts, this factor cuts qualifying income by a percentage. It does not depend on whether you chose 12 or 24 months. Swapping windows will not change it, though an accountant-prepared ratio may.

Account type and ownership. Personal deposits and business deposits are treated differently, and partial ownership scales the income down.

Think of it this way. Moving from a 12- to a 24-month window might shift your average by a modest amount if income is stable. Cleaning up commingled funds or documenting an expense ratio can shift it more. A good broker models both before you commit.

Who Decides Which Window You Get?

Usually the program does, not you. The window is a lender or investor design choice, and some offer both. Lendmire arranges these loans through a wholesale network, so a broker can see which programs allow a choice and which fix the window. When both are open, ask for both to be modeled on your actual statements.

Can you switch windows after you submit? That depends on the program. Switching changes the averaging period, but it does not change the expense factor, the deposit screening, or the document list. Fresh statements may be needed.

One timing point: the 12-month window rolls forward each month. Waiting a month drops the oldest statement and adds the newest. If the oldest month was weak and the newest is strong, waiting can lift the average. If the reverse holds, it hurts.

Short History, Account Switches, and Alternatives

Statement length is not business age, and neither is seasoning. Statement length is how many months of records you provide. Business age is how long you have been self-employed. Seasoning is a waiting period tied to a property or loan. Programs can test each one separately.

If you have fewer than 12 months of statements, the program generally cannot be used. If you switched banks, you can usually stitch two accounts together, as long as the statements are consecutive and nothing is missing. Self-employed borrowers can also fall back on other documentation.

Another path is asset depletion, which is reviewed against liquid assets. On a primary residence, the network’s asset-depletion option runs up to about 80% LTV, subject to lender guidelines.

A Simple Decision Checklist

Run through these questions:

• Is your income rising over the last year? Lean toward 12 months.
• Is your income seasonal or lumpy? Lean toward 24 months.
• Do you have fewer than 24 months of clean statements? Twelve may be your only option.
• Is your recent year well above the one before it? Twelve isolates it, but expect the underwriter to read the trend.
• Has income dropped lately? A longer window may look better on paper, though reviewers weigh the decline.
• Does the program let you choose? If so, ask the broker to run both.

Leverage and Occupancy: What Changes by Property

Occupancy decides the rules. A primary residence purchase or rate-term refinance can reach up to 90% LTV on select programs. For owner-occupied cash-out on a primary residence or second home, the ceiling is up to 80% LTV with a fixed expense ratio, or 75% with an accountant-prepared ratio, depending on loan size and credit. On an investment property, cash-out tops out around 75% LTV. Investment purchase leverage on bank statement documentation varies by lender, so treat it as a conversation, not a number.

Owner-occupied files are consumer mortgages, so consumer disclosure rules apply. 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. Consumer mortgage licensing for this lane covers 16 states. 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.

Bank Statement Loan or DSCR Loan?

These are different qualifiers. A bank statement loan is reviewed for the borrower’s personal or business cash flow. A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. A self-employed investor with heavy tax deductions may use bank statements for the personal side, while a rental purchase often fits DSCR better. Extended structures such as 40-year or interest-only terms sit on the DSCR side; alt-doc terms follow each lender’s program sheet.

Tax treatment varies by how funds are used and how property is held; consult a qualified tax professional before relying on any deduction.

What to Gather, and How Early

Pull more than the minimum. Have these ready:

• Every page of every statement, for each account in the window.
• Statements for each account that receives business income.
• A short written explanation of any large or unusual deposit.
• A list of transfers between your own accounts.
• An accountant-prepared expense ratio, if you have one.

Gather early. Missing pages and unexplained deposits are the most common reasons a file stalls, so cleaning them up first saves you a round of questions.

Key Terms Defined

Bank statement loan: A non-QM mortgage that averages your deposits over a set window instead of using traditional personal-income documentation.

Lookback window: The number of months of statements the lender averages, typically 12 or 24.

Eligible deposit: A deposit that counts as income after transfers, loan proceeds, and one-time items are removed.

Expense factor: A percentage taken off business deposits to estimate what the business spent to earn them.

LTV: Loan-to-value, the loan amount divided by the property value.

Asset depletion: A way to qualify from liquid assets rather than deposit income.

The Verdict

Neither window is better in general. Choose 12 months if your recent stretch is your strongest and your statements are clean. Choose 24 months if your income swings or you want a long, steady record. If your income is flat, expect similar results either way. Ask for both to be modeled when the program allows it, and fix your deposit hygiene first, since it usually matters more than the window.

Reach the team at 828-256-2183 or request a quote.

About Lendmire

Lendmire is a non-QM mortgage brokerage (NMLS# 2371349) arranging DSCR investor loans in 41 markets, including Washington, D.C. DSCR eligibility is generally reviewed around property-level rental income rather than personal income, subject to lender and program guidelines, a fit for self-employed investors and LLC-owned portfolios. Lendmire was recognized as a Scotsman Guide Top Mortgage Workplace in 2025 and 2026.

References

1. Scotsman Guide: residential non-QM borrowers

2. CFPB ATR/QM Compliance Guide