How Income Is Calculated For A Bank Statement Loan?

How Income Is Calculated For A Bank Statement Loan — The Quick Read: Lenders look at 12 to 24 months of bank statements, personal or business. They add up all deposits that count as income. They strip out anything that isn’t regular income. If the deposits come from a business account, they apply an expense factor. Then they average the result into one monthly qualifying-income figure. That figure works like a W-2 or tax-return income number. It feeds into debt-to-income calculations, just like on a conventional loan. Each lender sets its own expense factor and lookback period. There is no single industry formula.

A bank statement loan exists for a simple reason. Many borrowers don’t have a W-2 or a tax return that shows their real earning power. This often applies to self-employed workers, 1099 contractors, and small business owners. Their taxable income is often lower than their actual cash flow, thanks to deductions. So instead of taxable income, the lender looks at what actually moved through the borrower’s bank accounts. If you’re new to this loan type, start with what a bank statement loan is first. Then come back to the calculation details below.

What Exactly Gets Pulled From the Statements?

The process always starts with the lookback period. Most programs review 12 or 24 straight months of statements. Every deposit in that window falls into one of two buckets: recurring income or non-income.

A 24-month window smooths out a seasonal business or a short dip in one or two months. A 12-month window works when the lender’s program allows it. It helps a borrower whose recent deposits run stronger than an earlier slow stretch. Neither period is standard across the industry — each lender sets its own rule. If a program offers both options, run the numbers both ways. Pick whichever produces the stronger qualifying figure.

Once the window is set, the lender reviews every statement line by line. Recurring deposits count as income. This includes client payments, invoice collections, regular business revenue, and steady personal income deposits. One-time or non-income items usually don’t count. This includes transfers between accounts the same borrower owns, loan proceeds, gift funds, tax refunds, and large deposits with no clear income source. Lenders exclude these before the math even starts.

How Personal Bank Statement Deposits Are Treated

Lenders treat personal-account income differently than business-account income. There’s no separate business entity to subtract expenses from, so the deposit itself looks more like take-home pay. Still, most programs don’t count every dollar at full value. This is especially true if deposits look irregular, or if some deposits look like transfers from a business account the borrower also controls.

When personal deposits show a clean, steady pattern, lenders gain confidence. Picture roughly the same amount landing on a predictable schedule. In that case, lenders count a larger share of the total as qualifying income. When the pattern is inconsistent, the underwriter treats it differently. The same is true when deposits are clearly transfers from a business account instead of direct client payments. The underwriter may ask for a letter of explanation that ties the transfer back to the underlying business income.

How Business Bank Statement Deposits Are Treated

Business-account income runs through an expense factor. Gross deposits into a business account aren’t take-home income — the business has costs to cover first. A lender can’t just average total deposits like it would with a personal account. That would overstate what the owner actually takes home.

Two paths handle this:

1. The lender’s default expense factor. The lender applies a flat percentage — commonly around 50% — to the average monthly deposit total. The remainder counts as qualifying income. This is the fast path. It needs no extra documents beyond the statements themselves.

2. A CPA- or tax-preparer-documented expense ratio. The borrower’s accountant or enrolled agent can provide a signed letter or profit-and-loss statement. This document must show the business runs a different cost structure than the lender’s default. If it does, the underwriter can swap in that documented ratio instead of the flat factor. A service-heavy business with low overhead might document a ratio well under the default — that lifts qualifying income. A business with heavier fixed costs might document a ratio above the default — that lowers it.

Neither path wins by default. It depends on the business’s real expense structure. A borrower who assumes the flat factor is mandatory might leave qualifying income on the table. A borrower who assumes the CPA path always helps might find their documented ratio is actually worse than the lender’s default.

Comparing the Methods Side by Side

What Gets Excluded, No Matter Which Method Applies

A few deposit types stay out of the qualifying-income calculation entirely. This applies whether the account is personal or business:

• Transfers between the borrower’s own accounts. Counting the same money twice would overstate income.
• Loan proceeds. Borrowed funds aren’t earned income.
• Gifts and one-time windfalls. This means a single large deposit not tied to ongoing income, like a settlement or an asset sale.
• Unsourced cash deposits. This is cash that can’t be traced to a documented income stream.

These exclusions matter. The conversion from deposit total to qualifying income is never a simple average of everything that hit the account — the eligible base gets cleaned up first.

Multi-Account Businesses and Declining Trends

Some businesses don’t route all their income through one account. That complicates the review. Say a business takes payments through more than one channel. One account might handle reimbursements from a payer. A separate account might handle direct client payments. In this case, the underwriter has to reconstruct income across every account involved, not just read one statement in isolation. Skipping an account that’s part of the same business income stream can understate the borrower’s real qualifying income. That’s one reason the requirements checklist for a bank statement loan usually asks for every account tied to the business up front, not just the primary one.

A declining deposit trend gets special attention too. Say the last several months of a 24-month window show a clear downward slope compared to earlier months. If so, a lender may shorten the lookback period. The lender may also request a letter of explanation for the drop. Or the lender may apply the calculation more conservatively, reflecting the recent trend instead of a stronger historical average. The goal is simple: a qualifying-income figure that reflects the borrower’s current earning capacity, not a number propped up by an earlier period that no longer applies.

A Combined Walkthrough

Picture a self-employed borrower with 24 months of business bank statements. The deposit pattern is fairly steady, except for one large one-time deposit. That deposit came from selling a piece of equipment — not from ongoing business revenue. The underwriter’s first move is stripping that one-time deposit out of the eligible total, since it isn’t recurring income.

From there, the file applies an expense factor to the remaining, cleaned-up deposit total. Say the borrower goes with the lender’s default factor. Qualifying income comes out lower than it would under a CPA-documented ratio — assuming the business actually runs leaner overhead than the default assumes. A signed letter from the borrower’s accountant, documenting that lower expense ratio, could meaningfully raise the qualifying-income figure compared to the flat-factor path.

Whichever factor applies, the adjusted total gets divided across the number of months in the lookback period. This produces one monthly qualifying-income number. That figure plugs into the debt-to-income calculation just like a traditional employment income figure would on a conventional file. Lenders compare it against the borrower’s total monthly obligations. This determines how much loan the income can support.

Key Terms Defined

Qualifying income — the monthly income figure a lender uses to calculate debt-to-income. This comes after all adjustments and exclusions are applied to the raw deposit data.

Expense factor — the percentage of gross business deposits treated as overhead and excluded from qualifying income. This can be a lender default or a CPA-documented figure.

Lookback period — the number of consecutive months of bank statements a program reviews, typically 12 or 24.

Letter of explanation (LOE) — a written statement, often from the borrower or a tax professional. It documents the source of an unusual deposit, a declining trend, or a custom expense ratio.

Debt-to-income (DTI) — the ratio comparing a borrower’s total monthly debt obligations to their qualifying income, used to size how much loan the income supports.

Where This Meets Rental Property Financing

DSCR loans are designed for non-owner-occupied investment properties. They are business-purpose investor loans, so lenders review them differently from a standard owner-occupied mortgage. That distinction matters here, because bank statement analysis and DSCR review are two separate paths that solve two different problems. A bank statement loan swaps deposit history in for the borrower’s own personal or business income. A DSCR loan swaps in the property’s rental cash flow for the borrower’s income entirely. So the deposit-review exercise above never happens on the personal side of the file at all. The complete DSCR loans guide walks through how that property-level qualification works from the ground up.

The federal framework behind both is the same. Bank statement and DSCR loans don’t rely on W-2s or tax-return AGI. So they fall outside the Qualified Mortgage box set by the CFPB’s Ability-to-Repay/Qualified Mortgage rule. That rule still requires a reasonable, good-faith decision about repayment ability — it just doesn’t dictate a specific income-calculation method. That’s a deliberate design choice at the federal level, not a loophole. It’s why every non-QM lender writes its own expense-factor and lookback matrix instead of following one universal formula.

This split matters for an investor who runs a business and also owns rental property. Picture a borrower with strong business deposits but an unfavorable documented expense ratio. That borrower might qualify for more loan through DSCR on the rental side than through bank statement analysis on the personal side — because DSCR never touches the business’s deposit history at all. Understanding both — how rental income is calculated for a DSCR loan and how bank statement mechanics work — helps an investor structure a purchase or refinance around whichever program actually fits the file.

Across the wholesale network Lendmire (NMLS# 2371349) works with, purchase leverage on DSCR files most often lands around 75%–80% loan-to-value. A handful of programs reach 85% for borrowers with a 700 or better credit score. Cash-out refinances generally top out closer to 75% LTV. Most files expect roughly six months of ownership seasoning. A 1.00 coverage ratio compares rent against the full monthly housing payment. Select programs start there, but it’s not a universal minimum — stronger coverage tends to open better leverage and pricing. Credit floors run as low as 620 in parts of the network. Most programs are built around 660. A score of 700 or higher tends to unlock the strongest leverage tiers. Loan sizes generally run up to around $3 million under standard programs. Reserve requirements commonly land near six months of PITIA on most files, stepping up to roughly nine months on larger balances above $1.5 million. Coverage below 1.00 is available through select lenders in the network, though it typically comes with adjusted leverage and terms rather than standard pricing. A few programs also finance short-term rentals up to 75% LTV on purchase, generally expecting roughly 12 months of hosting history and a 1.10 coverage floor on purchases and 1.00 on refinances. What isn’t offered? Manufactured homes, log homes, and barndominiums fall outside DSCR eligibility across the network. Reserve documentation for these files works differently than on a bank statement loan. It’s worth comparing reserve requirements for a bank statement loan against DSCR reserve expectations before choosing a program.

If you’re buying or refinancing a rental property and want to see how the numbers work, Lendmire can help. Lendmire compares DSCR loan options based on the property’s income, credit profile, leverage, and investor goals. Reach Lendmire at 828-256-2183 or submit a quote request for either path.

Tax treatment of a bank statement loan or a DSCR loan can depend on how the funds are used and how the property is held. Investors should keep clear records. Talk to a qualified tax professional before relying on any deduction.

No loan scenario described here guarantees approval or commits anyone to lend. Every file goes through lender review, credit approval, property underwriting, and the program guidelines in place at the time of application. The figures and ranges here are general information only — not financial, legal, or tax advice.

For deeper background on the mechanics discussed here, see Scotsman Guide – “Rev Up the Engine for Non-QM Lending”.

About Lendmire

Lendmire is a non-QM mortgage brokerage (NMLS# 2371349). It arranges DSCR investor loans in 40 markets, including Washington, D.C., through wholesale and investor-lending channels. Lenders evaluate DSCR loans on rental income rather than personal income, subject to lender guidelines. This fits 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.

Scotsman Guide documents this recognition: Scotsman Guide 2025 Top Mortgage Workplace and Scotsman Guide 2026 Top Mortgage Workplace.

References

1. Consumer Financial Protection Bureau – Ability-to-Repay/Qualified Mortgage Rule

2. Scotsman Guide – “Rev Up the Engine for Non-QM Lending”