How to Pick 12 or 24 Months of Statements for a Bank Statement HELOC

The Quick Read: Choose the window that shows your real earning power as a clean average. Use 12 months when recent income runs clearly above the prior year, use 24 when income is seasonal or lumpy, and run both averages first, because the program’s own guidelines may fix the window for you.

• The window changes only two things: how many months you average over, and which months the lender sees.
• Income that is rising favors 12 months. Income that is seasonal or uneven usually favors 24.
• A declining trend is not fixed by switching windows. Lenders may look at the recent months anyway.
• Business deposits count only after an expense factor, so the account type matters as much as the window.
• A bank statement HELOC lends to you personally, not to an LLC. Title and leverage limits can matter more than the window.

Key Terms Defined

• Bank statement HELOC: A home equity line of credit that is reviewed around deposits in your bank accounts instead of traditional personal-income documentation or W-2s.
• Lookback window: The number of consecutive months of statements the lender reads, usually 12 or 24.
• Qualifying income: The monthly figure the lender decides you earn, after removing deposits that are not income and applying any expense factor.
• Expense factor: A percentage the lender subtracts from business deposits to account for the cost of running the business.
• CLTV: Combined loan-to-value, meaning all loans against the property added together, divided by its value.
• DTI: Debt-to-income ratio, meaning your monthly debts divided by your qualifying income.
• DSCR: Debt service coverage ratio, meaning a property’s rent divided by its full monthly payment of principal, interest, taxes, insurance, and any association dues.

What Do the Two Windows Actually Measure?

Both windows measure the same thing: how much money flowed into your accounts. They differ in how far back the lender looks and how heavily a single odd month weighs. A 12-month window is a recent snapshot. A 24-month window is a longer average that smooths out the highs and lows.

Across Lendmire’s wholesale network, the decision rarely hinges on the window alone. The lender totals eligible deposits, divides by the months in the window, and runs the result through the debt-to-income test. Same deposits, different denominator.

Here is the practical effect. In a 12-month window, one large deposit or one weak quarter moves the average a lot. In a 24-month window, each month counts for less, so a single spike matters less and old weak months stay in the math.

How Underwriting Treats the Statements, Step by Step

Lenders follow roughly the same sequence. Each step is where the window choice either helps or hurts.

1. Choose the account type and window. You submit personal or business statements, in a window the program accepts. Trade-press coverage of non-QM lending describes 12 to 24 months of personal or business statements as the standard framework for self-employed borrowers. Which windows a given program accepts comes from that program’s guidelines.

2. Strip out non-income deposits. Transfers between your own accounts, refunds, and loan proceeds are not earnings. Lenders generally remove them, and a short window feels each removal more.

3. Apply the expense factor to business deposits. The lender keeps only a share of business deposits. The same trade-press piece uses 50% as an example, but that is an illustration, not a rule. The lender sets the factor, and a third-party profit-and-loss statement can serve as an alternative on programs that allow it.

4. Divide by the months in the window. This produces monthly qualifying income. It is the one step where 12 versus 24 changes the number.

5. Run the tests. The lender then checks DTI, credit, combined leverage, and the property. On the home equity line programs Lendmire places, DTI tops out at 50%. It sits at 45% for credit scores from 600 to 679, and anything above 45% needs a 680 minimum. The line is qualified on the interest-only payment calculated on the maximum draw, so a bigger line needs more qualifying income.

That fifth step is why the window matters. A higher monthly average can lift the line size you qualify for. A lower one can shrink it or sink the file.

Which Income Patterns Favor Which Window?

Match your income shape to the window. The table is a starting point, not a verdict, and the lender’s guidelines still control.

If your income is flat, stop agonizing. The two averages land near each other, and the better use of your time is cleaning up deposits and confirming which accounts the program wants.

A Worked Example With Index Numbers

Here is the arithmetic without dollar figures, so you can plug in your own. Treat these as modeled assumptions, not market data.

Rising income. Set your average monthly eligible deposits in the earlier 12 months at 100. Say the most recent 12 months average 125. The 12-month window reads 125. The 24-month window reads 112.5, because the weaker year drags the average down. Here, 12 months produces about 11% more qualifying income than 24, which could mean a larger line.

Seasonal income. Say a landscaper’s deposits swing widely, with a heavy spring and summer and a thin winter. A 12-month window that happens to end right after the peak season looks strong, but a window that ends in the thin season looks weak. The 24-month window captures two full cycles, so the average is steadier and less dependent on the month you applied.

Declining income. Say the earlier year averages 100 and the recent year averages 80. A 24-month window reads 90, which looks better than the 80 the recent months show. But under a 24-month program, a lender may truncate to the recent months or run a trend check. Whether and how it does so is a guideline question for that program.

The takeaway: run both averages before you commit. The gap between them tells you which window helps you, and whether the lender will see the same story you do.

Where the General Rule Breaks

The 12-for-rising, 24-for-seasonal rule holds most of the time. These are the cases where it bends.

Commingled accounts. If personal and business money share one account, lenders usually treat it differently from a clean business account. Expect an expense factor, a request for a business narrative, or both. The window does not solve a messy account.

Pass-through deposits. A contractor who collects payment and immediately pays crews has deposits that are not really earnings. These may need to be excluded or priced in through a higher effective expense factor. A short window magnifies the damage of a few large pass-through deposits.

Seasonality timing. Which 12 months you submit matters. If your statements end just after your slow season, 12 months can understate you. If the program fixes the window to the most recent months, waiting a month or two before you apply can change the average.

Programs that fix the window. Some programs accept only one window. If so, the choice is not yours, and your job is to confirm the window before you build any calculation around the other one.

A weak recent trend. Switching to 24 months does not rescue a declining pattern if the lender weights recent months. The honest options are a lower line request, more equity, or waiting until the trend stabilizes.

Title and vesting. This one catches many investors. These lines require the property to be held by you individually or by a revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title. If your rental is deeded to an LLC, you need a vesting change or a different tool, such as a DSCR cash-out refinance, subject to program terms.

Who Decides the Window?

The program decides, not a federal rule. No federal statute tells a lender to use 12 versus 24 months for a home equity line. The federal ability-to-repay rule lists eight factors but does not dictate a particular underwriting model, and compliance commentary notes the closed-end version of the rule excludes open-end credit such as a line of credit. A lender must still judge whether you can repay. Qualifying on deposits changes how it measures income, not whether it checks.

What you control is the information you bring. You can ask which windows the program accepts, whether the lender can use whichever one you choose, and whether recent months get extra weight. You can also ask what happens if new months roll in while the file is open. Programs differ on that, so get the answer before you gather documents. For a mortgage version of the same decision, see Lendmire’s piece How to Choose 12 vs 24 Months on a Bank Statement Mortgage.

How Does This Affect a Rental Investor?

Rental investors often show low taxable income because depreciation and write-offs shrink the return. Deposit-based income can surface stronger cash flow than the return does. That is why this product exists. The window choice then decides which months define your income, which moves your DTI and, through it, your line size.

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.

Income is only one of two tests. The line also has to clear the combined leverage limit, and the limits depend on occupancy:

• Investment property: The ceiling is 70% CLTV, with a 700 minimum credit score and lines up to $500,000.
• Primary residence or second home: The ceiling reaches 90% CLTV, but only at a 720-or-better credit profile, and that tier tops out at $500,000. Lower scores step down to lower ceilings.

All figures are subject to lender guidelines and full file review. Availability of these lines is also narrower than Lendmire’s DSCR footprint, which spans 41 markets including Washington, D.C., so confirm your state early. The strongest files clear both tests: enough equity and enough qualifying income.

Bank Statement HELOC or DSCR Loan?

Compare the two on three points.

A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. Many programs start at a 1.00 coverage ratio, and a separate select-lender path goes below 1.00 with leverage and terms adjusted. Clearing 1.00 does not mean positive cash flow. The ratio compares rent to the payment only, and repairs, vacancy, and management sit outside it.

If your income story is weak but the rent is strong, or the property sits in an LLC, DSCR is often the better fit. The complete DSCR loans guide covers the alternative in full, and Lendmire’s page on bank statement HELOC programs covers the line product itself.

Questions to Ask Before You Submit

Bring these to your loan officer. They save more time than any calculation.

• Which windows does this program accept, and can I choose?
• Are personal statements, business statements, or both required?
• What expense factor applies, and can a CPA letter or profit-and-loss statement replace it?
• Will the lender look at a trend inside a 24-month window?
• How are large one-time deposits and transfers treated?
• Are the statements used for income also used for reserves, or is that a separate set?

Before you submit, pull every month of deposits into one sheet. Mark transfers, refunds, and loan proceeds, then compute both averages. Write a short explanation for any large deposit or overdraft. Clean consecutive PDFs prevent most delays.

If you are considering a home equity line and want to see how the numbers work, Lendmire can help you compare HELOC options based on the property, the equity available, credit profile, combined leverage, and your goals. You can reach the team at 828-256-2183 or request a quote through the Lendmire quote page.

About Lendmire

As a mortgage broker (NMLS# 2371349), Lendmire helps homeowners and real estate investors in its 16 full-service states open home equity lines of credit arranged through wholesale lenders. Lendmire is never the lender; line amounts, ceilings and terms are set by the lender under its guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Scotsman Guide – Rev Up the Engine for Non-QM Lending

2. CFPB – ATR/QM Small Entity Compliance Guide