Should You Choose a 12-Month or 24-Month Bank Statement Loan?

The Quick Read: It depends on your deposit trend: choose the 12-month window when your deposits are rising or peaked recently, choose 24 months when income is uneven, seasonal, or has recently dipped, and remember the lender program, not you, usually decides which windows are even offered. The window only changes which months get averaged, so ask for both calculations before you commit.

• Rising deposits: 12 months usually produces the higher qualifying income, because a 24-month average blends in the weaker older year.
• Uneven or seasonal deposits: 24 months smooths the swings, if the program allows it.
• Declining deposits: a longer window can lift the average, but it cannot hide the direction of the trend.
• Availability: many programs offer one window, and few let you pick.
• Rental-driven files: a self-employed investor buying a rental often compares bank statements against a DSCR loan, not 12 months against 24.

What Does the Window Actually Change?

The window is the look-back period. The lender takes 12 or 24 consecutive months of statements, keeps the deposits that count, and divides by the number of months. That gives monthly qualifying income, which then feeds your debt-to-income ratio.

Nothing else about the loan changes by itself. Credit, reserves, and the property get reviewed the same way either way. The window shifts the average and the paperwork load, and nothing more unless a specific program sheet says otherwise.

This is not a skip-the-paperwork loan. A bank statement loan is reviewed on documented income under the applicable program, subject to lender guidelines. Deposits are screened, and the lender still has to be comfortable that you can repay.

Across the wholesale network Lendmire works with, the program parameters center on 12 months of business or personal statements. Whether a given lender also accepts 24 months follows that lender’s own program sheet. That is why the first useful question is never which window is better. It is which windows this program accepts.

How Do the Two Windows Compare?

The 12-month window rewards recent strength and asks for less paper. The 24-month window rewards consistency and asks for more. This table shows the structural differences.

One caution on the underwriter row. A longer track record can look steadier, but the trend still gets read. Two years of falling deposits tells a worse story than one steady year.

Which Window Fits Your Income Pattern?

Match the window to the shape of your deposits. Chart your monthly totals first, then pick.

Rising Income

Use 12 months. Every older, smaller month you add pulls the average down. If your income has grown steadily, the recent year is the honest picture of what you earn now, and it produces the stronger number.

Steady Income

Either window works, and the gap between them is small. The 12-month version means fewer statements to gather. The 24-month version adds a stability story at the cost of more documents. With flat deposits, the paperwork difference usually decides it.

Seasonal or Lumpy Income

Lean toward 24 months. A 12-month window can land on a strong stretch or a weak one, depending on where it starts. Two years covers two full cycles, so a single hot quarter or cold quarter distorts the average less.

Dipping or Recovering Income

Treat this as the hard case. A 24-month window can raise the average if the older year was stronger. Underwriters still look at direction, and some programs flag a declining trend or shorten the review back to 12 months. If your dip was temporary and you can explain it, 24 months may help. If deposits keep sliding, expect questions under either window.

Run the Numbers on Your Own Deposits

Model both averages before you apply. The examples below use relative percentages, not dollar figures, and they are hypothetical.

Rising income. Say year-two deposits run about 20% above year one. A 12-month average uses only year two. A 24-month average lands near the midpoint, roughly 8% below the 12-month figure. On a larger loan, that gap can change how much you qualify for.

Strong year first. Say year one was your peak and year two ran lower. Now the 24-month average beats the 12-month one. The longer window helps, though the lender will still see the drop.

Seasonal pattern. Say most of your income arrives in a few busy months. A 12-month window that ends right after the busy season looks strong. One that ends after the slow season looks weak. The 24-month version averages both and gives a steadier read.

Here is a five-step self-test you can run in an evening:

1. Check your history. Many programs expect about two years of self-employment. Some offer an exception path if you have at least a year plus prior years in the same line of work. Treat that as program-dependent.

2. Pull deposits by month. Use the statements for the accounts you would submit, one total per month.

3. Strip what will not count. Remove transfers between your own accounts, loan proceeds, and one-off items.

4. Run both averages. Add the last 12 months and divide by 12. Then add 24 months and divide by 24. For business accounts, remember the lender will apply an expense factor afterward.

5. Ask the loan officer which windows the program accepts. Ask them to run both if the program permits.

Which Deposits Count Inside the Window?

Only deposits that qualify as your income survive screening. The window choice and the deposit screen work together, so one affects the other.

Personal-account deposits are generally read close to face value. Business-account deposits get reduced by an expense factor, which the lender sets. A statement prepared by an accountant can sometimes adjust it, but you do not pick the number. Programs differ on how they handle this, so nobody can promise a universal formula.

The screening rule has a federal root. The CFPB’s Small Entity Compliance Guide on ability-to-repay lists bank account statements among the third-party records a creditor can use to verify income. A later revision to that guidance says a creditor relying on deposits must confirm the inflows are the consumer’s personal income. That is why transfers and loan proceeds get stripped out. Nothing in the guidance sets 12 months or 24 months. The window is lender and program policy.

Check every account that carries your income. Scotsman Guide describes bank statement loans as a way for self-employed borrowers to qualify on actual income rather than the figure on a tax return. It stresses reviewing all of a borrower’s accounts, because one account alone can miss real income. Its examples include separate cash-receipt and card-payment accounts and businesses with multiple locations. Couples who each have non-traditional income may need both sets of statements.

Partial owners count only their share. If you hold a minority stake, the lender prorates the deposits to your ownership percentage.

Write-offs are the reason many self-employed borrowers use these loans at all. Deductions shrink tax-return income, while deposits show cash that actually came in. Tax treatment varies; consult a qualified professional.

Where Does the General Rule Break?

The trend rule fails in five common situations.

The program forces one window. In the wholesale network Lendmire works with, many lenders post one documentation window and do not let you choose. If your best number sits in the other window, you need a different lender, not a different strategy.

Your business is under two years old. A 24-month window is not an option without the history. Some lenders make an exception for borrowers with at least a year of self-employment and relevant prior experience. Treat it as a case-by-case review.

Your income is falling. Underwriters read declining deposits skeptically. A 24-month window may raise the average, but a flagged downward trend can offset that gain. Honest context helps more than window shopping.

Your deposits are lumpy. A single large, one-time deposit can inflate a 12-month average far more than a 24-month one. Lenders may exclude it. Do not build your numbers around it.

Your loan is large. Bigger loans usually draw more scrutiny of income stability. A longer track record can read better on a large file, though the lender’s program sheet governs.

Timing also matters. If a few strong months are about to roll into your 12-month window, letting more of them accumulate can improve the average. If a weak stretch is about to roll in, applying sooner may help. Run both versions before you decide.

When Neither Window Is the Right Tool

Sometimes the better question is whether a bank statement loan fits the deal at all.

A bank statement loan is reviewed on your personal or business deposit income. A DSCR loan, a debt service coverage ratio loan, qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. If you have strong deposits and a weak rental, bank statements fit better. If your deposits are thin but the rent is strong, DSCR often fits better. The complete DSCR loans guide walks through how that math works.

Occupancy decides the paperwork regime too. A bank statement loan on a primary residence or second home is a consumer mortgage, and TRID disclosure rules apply. A bank statement loan on a non-owner-occupied rental, including a short-term rental, is business-purpose and exempt from TRID. Investor loans built for non-owner-occupied rentals are reviewed differently from a standard owner-occupied mortgage.

Other documentation paths exist too. A profit-and-loss program may fit a business with clean books. Asset depletion is reviewed against liquid assets and runs to about 80% LTV on a primary residence, subject to lender guidelines. A full-documentation loan using traditional personal-income documentation can work if your returns already show the income you need, and it may be worth trying first.

What Leverage and Loan Size Should You Expect?

Leverage depends on occupancy and transaction type, not on the window. These are typical ranges from select lenders in the network, not commitments.

• Primary residence purchase or rate-and-term refinance: up to 90% LTV. Stronger files earn the top of the range.
• Primary residence cash-out: up to 80% LTV with a fixed expense ratio, or 75% with an accountant-prepared ratio.
• Second home cash-out: up to 75% LTV, set by loan size and credit.
• Investment property cash-out: tops out around 75% LTV.
• Investment property purchase: varies by lender on bank statement documentation. Investor leverage guidance belongs on the DSCR side.

Loan amounts typically run from $125,000 to $3,500,000, and reserves commonly sit around six months of the housing payment. Term length follows each lender’s program sheet. Extended structures such as 40-year or interest-only terms are DSCR-side offerings, so do not assume a bank statement loan carries them.

The window can move the loan size indirectly. A higher qualifying income supports a larger payment inside the same debt-to-income limit. The LTV caps above do not change with the window.

Common Myths About the Window

Myth: 24 months is always safer. It depends on the trend. With rising income, 24 months lowers your number. With uneven income, it can raise it.

Myth: 12 months means a riskier loan. The window decides which months are averaged. It is not a quality grade.

Myth: you choose the expense factor. The lender sets it. An accountant’s statement can sometimes adjust it.

Myth: every deposit counts. Transfers, loan proceeds, and one-time items get excluded, and business deposits are reduced.

Key Terms Defined

Bank statement loan: a mortgage that is reviewed around average deposits over a set window instead of tax-return income.

Look-back window: the number of consecutive months of statements the lender averages, usually 12 or 24.

Expense factor: the percentage of business deposits the lender treats as operating costs rather than income.

Debt-to-income ratio: your monthly debts divided by your qualifying monthly income.

LTV: loan-to-value, the loan amount as a percentage of the property’s value.

DSCR: debt service coverage ratio, a rental-property test that compares rent to the monthly obligation.

Next Step

If you are self-employed and want to see how the numbers work, Lendmire can help you compare bank statement loan options based on your deposits, the property, credit profile, leverage, and your goals. Lendmire is a mortgage broker that arranges financing through select lenders, and its consumer bank statement programs cover 16 states. Qualification is subject to lender guidelines and is not a commitment to lend.

Lendmire’s piece 12-Month vs 24-Month Bank Statement Loan: Which Gives You More Income? works through the averaging. The piece How to Meet the Same-Account Rule on a 12 or 24 Month Bank Statement Loan covers which accounts the statements must come from.

Run both averages on your own deposits first, because the strongest window is the one your numbers prove, not the one a rule of thumb suggests.

About Lendmire

As a mortgage broker (NMLS# 2371349), Lendmire helps self-employed and high-net-worth borrowers in 16 states qualify on bank statements, a profit-and-loss statement, 1099s or liquid assets instead of tax returns, through wholesale lenders. Lendmire is never the lender; program terms are set by the lender and its guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB ATR/QM Small Entity Compliance Guide

2. CFPB ATR/QM Small Entity Compliance Guide, revised edition

3. Scotsman Guide, “Don’t Shut the Door on Quality Borrowers”