How a CPA Letter Changes Your Bank Statement Loan Income

The Quick Read: A CPA letter replaces the lender’s default expense assumption on business bank statements with the percentage your accountant certifies. The deposits stay the same. Only the expense factor moves, so qualifying income moves with it, and it can move down as easily as up.

• The letter is evidence, not an override. The underwriter tests it against your statements and your type of business.
• It matters mainly on business-account files. Personal statements often count deposits with little or no expense factor.
• It is usually optional. Many programs never ask for one.
• A lower certified ratio raises usable income and lowers your debt-to-income ratio on the same deposits.
• A real expense ratio above the default would cut your income. Estimate it before you pay for the letter.

Bank statement lending exists for borrowers whose traditional personal-income documentation understates what the business actually brings in. Heavy write-offs shrink taxable income, and that is the reason these programs exist. Lendmire arranges bank statement loans through select wholesale lenders, and the CPA letter is one of the most misunderstood pieces of that file. This article walks through what it is, how underwriters treat it, where it breaks, and how to decide whether to get one.

Key Terms Defined

Bank statement loan: A mortgage that qualifies a borrower on documented deposits instead of traditional personal-income documentation.

Expense factor: The percentage of business deposits the lender assumes goes to operating costs rather than income.

CPA letter: A signed letter from a licensed preparer certifying the business’s actual expense percentage.

Qualifying income: The monthly figure the lender uses after averaging eligible deposits and subtracting expenses.

Debt-to-income ratio (DTI): Monthly debts divided by qualifying monthly income.

How Is Bank Statement Income Calculated?

Qualifying income starts with deposits, not profit. Across Lendmire’s wholesale network, the typical file uses 12 months of business or personal statements, and the lender averages the deposits that count as real income. Experian describes these loans as built for borrowers who can’t supply W-2s, pay stubs, or traditional personal-income documentation, with lenders reviewing one to two years of statements. Bankrate adds that investors, the self-employed, and people with significant tax deductions are among those the product can suit.

The calculation runs in a clear order:

1. Choose the account type. Personal statements often count deposits with no expense factor. Business statements take one.

2. Pull consecutive statements. The program sets the window. Twelve months is the common baseline in this lane.

3. Strip non-income deposits. Transfers between your own accounts, loan proceeds, and one-off deposits come out.

4. Average what remains. That gives monthly eligible deposits.

5. Apply the expense factor. Qualifying income equals average eligible deposits times one minus the expense factor.

6. Feed the result into DTI. More usable income means a lower DTI against the proposed housing payment and other debts.

Business statements show gross deposits, so lenders need some way to estimate what the owner actually keeps. With no third-party documentation, a flat conservative default applies, commonly around half of deposits. Each lender sets its own rulebook, and some assign different default tiers by business type. A lean service business may get a lighter default than a business that carries inventory and staff. Don’t count on any one factor. Programs differ, and every file is underwritten individually.

What the CPA Letter Actually Changes

The letter swaps the default for your real number. A CPA, enrolled agent, or qualifying tax preparer signs on letterhead and states a specific percentage, the period it covers, the business name, and the preparer’s credentials. The underwriter then uses that percentage in place of the default.

Run the logic with no dollar figures. Say a business shows the same average deposits under two scenarios. Under the default factor, a large share of deposits disappears before qualification. Under a certified ratio well below the default, far more of the same deposits count, and DTI drops. Nothing about the business changed. The documentation did.

Three things the letter does not do:

• It doesn’t reduce your real expenses or taxes. It documents an existing ratio.
• It doesn’t replace the statements. Deposits are still verified. A bank statement loan is not a stated-income loan.
• It doesn’t prove itself. Self-certification doesn’t count. The number has to come from a licensed third party.

That last point connects to a basic lending principle. The CFPB’s ability-to-repay compliance guide says a creditor must verify the income and assets it relies on using reasonably reliable third-party records. The guide doesn’t prescribe an expense-ratio formula for bank statement programs. A CPA letter is therefore a feature of individual lender programs, not a federal requirement. That is why it is optional on most files and why the rules differ from lender to lender.

How Underwriters Treat the Letter, Step by Step

Underwriters read the letter as a claim to be tested. In practice the review follows a predictable path.

Credentials first. The preparer must be verifiably licensed. A signature with no license information invites a request for more.

Period match second. The letter’s coverage period should line up with the statements in the file. A letter that covers a different year than the deposits raises questions.

Plausibility third. A lean one-person consultancy is believable at a low expense ratio. A business with a payroll, inventory, or heavy equipment costs is not. Underwriters know typical cost structures by industry and compare your number against them.

Program permission fourth. Some programs don’t allow a reduced ratio at all. Others set a minimum floor on what a preparer can certify, and floors vary by program. Where a program does set one, a letter certifying a figure below it won’t pass.

Preparer attestation last. Some programs want the preparer to confirm they prepared the latest business tax return, or reviewed the underlying records. A letter that skips a required statement gets sent back.

The most common failure is a letter that never states a percentage. If the lender is going to use a ratio below its default, it needs a number it can point to, supported by a third-party letter or a CPA-prepared profit-and-loss statement. Vague language about the business being “profitable” doesn’t do the job.

The Structures and Variations

Two documentation paths often get blurred, and they are different things.

Some programs accept a CPA-prepared P&L in place of a standalone ratio letter. Some cross-check the P&L’s stated revenue against actual deposits and want the two to land close together. A P&L-only program is a separate path entirely. It uses the P&L as the income document instead of bank statements.

A third variation is the account type. If you submit personal statements that clearly reflect business operations, a lender may push the file onto its business-statement rules. Choosing personal statements to dodge the expense factor is not a reliable plan. Transfers from your own business account into a personal one can also count differently from ordinary deposits, depending on the program.

Where the General Rule Breaks

The rule “a CPA letter raises income” fails in several named situations.

Your real ratio is higher than the default. This is the main downside, and the one most promotional pages skip. A business with serious overhead, such as materials, subcontractors, vehicles, or staff, may have a true expense ratio above the lender’s default. A letter that honestly says so lowers qualifying income. Ask your accountant for an estimate before requesting anything formal.

The business is in the wrong tier. If a lender applied a service-business default to what is really a product business, the correct factor could push DTI past the program maximum. The same letter mechanism that helps a lean consultant can hurt a business with a cost of goods.

The letter gives no ratio. Without a stated percentage, the underwriter has nothing to substitute, and the default stays.

The preparer can’t or won’t attest. Some accountants decline to certify an expense ratio because of liability concerns. Others will sign only after reviewing the full business return and working papers. A CPA who doesn’t know your books can’t responsibly sign one.

The letter is stale. A letter that predates the statement period or the latest return can be rejected as out of date.

The program doesn’t use one. Many programs never ask for it. If the file already is reviewed on the default factor, the letter may add cost and delay for no benefit.

Agency-style underwriting. Conventional agency files work from tax-return net profit using a cash-flow worksheet, so the CPA letter plays a different role there. This article covers bank statement programs, not agency rules.

Should You Get One? A Decision Test

Run this test before paying anyone.

1. Ask your accountant for a rough expense ratio based on your latest return and books.

2. Compare it to the lender’s default for your business type. Your loan officer can tell you which applies.

3. Decide by the gap.

Cost matters too. The letter needs a cooperative preparer, and that takes lead time you should plan for in your contract timeline. If the extra income only moves you from comfortable DTI to slightly more comfortable DTI, the effort may not pay. If it is the difference between the loan size you need and a smaller one, it is usually worth pursuing.

An experienced practitioner sees the same pattern across many files. The borrowers who benefit most run lean, service-style businesses with large write-offs and little cost of goods. The ones who get surprised tend to be owners who assumed their accountant’s tax-return expenses equal the ratio a lender will accept. Tax deductions and operating expenses overlap, but they aren’t identical. Settling that with the CPA first prevents a bad letter from landing in the file. For more on this mechanism, see Lendmire’s piece How a CPA Letter Changes the Expense Factor on a Bank Statement Loan.

What to Bring Your Accountant

A letter is only as good as the records behind it. Before the request, gather:

• Business bank statements for the full qualifying period
• The most recent business tax return and any profit-and-loss statement
• The lender’s required letter elements, if the program lists them
• The business name, ownership details, and the period to be covered
• Any note on one-time or unusual expenses

Ask the preparer to state a specific percentage, name the period covered, include license or credential details, and sign on letterhead. Confirm whether the program requires the preparer to attest that they prepared the latest return. Then send the signed letter to your loan officer for a pre-check before it goes into the file.

What It Means for Investors

A bank statement loan is reviewed for the borrower, not the property. That makes it a fit for an investor buying a primary residence, or a second home, where business income must carry the file. Primary-residence purchase and rate-term financing can reach up to 90% LTV through select lenders, with stronger files earning the top of that range. Owner-occupied cash-out runs up to 80% LTV with a fixed expense ratio, or 75% with an accountant-prepared ratio, by loan size and credit. Investment-property cash-out tops out around 75% LTV, and investment purchase leverage on bank statement documentation varies by lender. Loan sizes generally run from $125,000 to $3,500,000, with reserves commonly around six months of the housing payment.

Occupancy decides the disclosure regime. An owner-occupied file is a consumer mortgage. A bank statement loan on a non-owner-occupied rental is business-purpose and exempt from TRID. Those two should never be mixed in your planning.

For a pure rental purchase, many investors use a DSCR loan instead, which qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. It skips the CPA-letter step entirely. The trade-off is that the property’s rent decides the outcome rather than your business income. An investor with strong business cash flow and a thin-rent property may do better on bank statements. An investor with a high-rent property and messy business books may do better on DSCR. Lendmire’s complete DSCR loans guide covers that path in depth.

Tax treatment varies; consult a qualified professional.

Reach the team at 828-256-2183. Qualification is subject to lender guidelines, and nothing here is a commitment to lend.

About Lendmire

Lendmire — NMLS# 2371349 — is a mortgage brokerage specializing in DSCR investor loans, helping arrange financing across 41 markets, including Washington, D.C., through wholesale and investor-lending channels. The model centers on property-level rental income reviewed by the lender rather than W-2 documentation, subject to lender guidelines, suiting entity-owned and multi-property investors. Lendmire holds Scotsman Guide Top Mortgage Workplace recognition for 2025 and 2026.

References

1. Experian: What Is a Bank Statement Loan?

2. Bankrate: Bank Statement Loan

3. CFPB ATR/QM Small Entity Compliance Guide