For CPAs: How Your Clients Qualify for a Jumbo Mortgage Without Their Tax Returns

What does a jumbo lender actually need from a client's CPA?

On most files Mbanc Private Client Lending needs nothing from the CPA beyond, occasionally, a short factual letter confirming facts you already know: that the business exists, who owns it and in what percentage, and in some files the business's expense ratio. You are never asked to vouch for the client's creditworthiness. No tax returns, no IRS transcripts and no Form 4506-C are part of these programs.

That is a different request from the one many CPAs have learned to dread. A conventional jumbo is underwritten on tax returns, so the CPA's phone rings when the underwriter cannot reconcile a Schedule C, a K-1 or an add-back for depreciation, and then rings again when someone wants a letter saying the business can afford for the owner to pull cash. The Private Client Lending desk of Mortgage Bank of California Inc. dba Mbanc does not underwrite on returns at all. Point four of the desk's CPLA five-point standard says it plainly: income is read as it is earned, from deposits, 1099s, assets or rents, never from a tax return.

Where your judgment, not ours, governs, this guide says so. It sits alongside our overview of the four-seat advisory table, where the accountant holds the first seat and the private mortgage banker the fourth.

Why do tax returns understate the income of the clients you advise?

Because a return is built to report taxable income lawfully and efficiently, and a mortgage underwriter reading it treats the result as the client's earning power. The better you do your job, the smaller the number the underwriter sees.

You know the mechanics better than any lender. Accelerated depreciation, retirement contributions through the business, a vehicle, a home office, health premiums, retained earnings left in an S corporation, the timing of a large expense in December: each is a legitimate planning choice, and each lowers the line a tax-return underwriter divides by twelve. We call this the write-off paradox. From the borrower's chair it feels like a penalty for being well advised. From your chair it is worse: the client sometimes asks whether next year's return should show more income so the mortgage works.

That conversation is the one this underwriting is designed to end. When a lender qualifies on deposits or assets, the planning you did stays done. The preferred banking gap describes the category problem from the client's side: a valued banking customer whose mortgage is still underwritten like a salaried borrower's.

What does the desk read instead of the return?

One of four documents sets, chosen by how the client is actually paid: bank statements for business owners, 1099s for independent earners, account statements for clients who qualify on wealth, and the property's rent for investors.

Three definitions for the client file. A bank statement jumbo loan is a mortgage above the conforming limit that qualifies a self-employed borrower on 12 or 24 months of deposits instead of tax returns. PITIA is principal, interest, taxes, insurance and association dues. DSCR, the debt service coverage ratio, is the property's rent divided by that payment. Program detail lives on the Founder Loan page and in the guides to bank statement qualification and asset-based qualification.

How is bank statement income calculated, in numbers?

Qualifying deposits over the window are totaled, transfers between the client's own accounts and unexplained one-off items are removed, the total is averaged by month, and business deposits are then reduced by the expense factor.

Two points for the CPA. First, the expense factor is a convention of the guideline, not a claim about the business's true margin. Second, a lower ratio needs a written statement from a CPA, EA or tax preparer, or net income from a third-party-prepared profit and loss statement that the deposits support; the floor is 10%. The full mechanics are in our note on the bank statement expense factor.

What will the desk never ask a CPA to sign?

The desk will never ask you to attest that a client is solvent, that the business can sustain a withdrawal, that income will continue, or that the client can repay the loan. Those are underwriting conclusions, and under the federal ability-to-repay rule they belong to the lender.

The professional liability literature has warned CPAs about comfort letters for years. Written assurance to a third party can stray into attestation territory unless the work is performed and reported under attestation standards, and the advice from risk-control specialists has been consistent: confirm facts you know, such as that you prepared the returns, and decline to opine on solvency or repayment. We agree, and our process is built so the question never reaches you.

Non-QM is not a loophole around that rule. A non-QM loan is a mortgage that falls outside the Qualified Mortgage definition but must still satisfy the ability-to-repay requirement; the deposit history, the 50% DTI cap (55% on a primary residence with $3,500 of monthly residual income, 6 months of reserves and an LTV within the guideline's limit for it), at least $1,500 of monthly residual income otherwise, and post-closing reserves are how the desk satisfies it. Our comparison of non-QM and conventional jumbo loans covers the regulatory frame.

How does the desk verify that your client owns the business?

Ownership and percentage are confirmed from documents that already exist, such as formation and state filing records, operating or shareholder agreements, or, when those do not show it cleanly, a factual letter from the tax preparer.

Ownership matters because business deposits are not the owner's income in full when there are partners. A client who owns 60% of a firm is qualified on 60% of the qualifying deposits, after the expense factor. The client must own at least 25% of the business for its statements to be used; a sole proprietor or single-member entity is read at 100%. Where there are several entities, each is read on its own statements, which is why the desk asks early how the client's businesses are organized. Our guide to S corporation owners works through one of those structures.

Length of self-employment is the other fact we check. Twelve months can work; two years is cleaner. Brand-new income without deposit history is a poor fit for this underwriting, and we will say so on the first call rather than after an application.

Does this underwriting change how you should plan the client's taxes?

No. The point of deposit-based and asset-based underwriting is that tax planning and mortgage qualification stop competing, so you can plan the return on its own merits.

What we can tell you is how a given choice reads in underwriting, so the client is not surprised. Depreciation, retirement contributions and expense timing do not reduce gross deposits. Moving large balances between the client's own accounts during the statement window creates items that must be excluded or explained, which adds work without changing the answer. Whether any of it is wise for the client is your call, never ours; Mbanc does not give tax advice.

One tax point clients raise at closing: the mortgage interest deduction remains limited to interest on up to $750,000 of acquisition debt ($375,000 married filing separately), and the One Big Beautiful Bill Act of July 2025 kept that limit. Every Private Client loan is $1,000,000 or more, so the question of how the limit applies is yours to answer. Your CPA, not your lender, decides how this applies to you, and in this case the CPA is you.

When is this the wrong tool for a client?

When the client's returns already show the income needed, a conventional jumbo underwritten on those returns is usually the better tool, and we will say so.

• Clean returns, W-2 or high reported income. If the return describes the client accurately, use it. Alternative documentation exists for the clients whose returns do not.
• Loan amounts under $1,000,000. These go to the core Mbanc desk at mbanc.com or (844) 918-1886.
• Credit below 680. Outside this desk's floor.
• Brand-new self-employment with no deposit history. There is nothing yet to read.
• Construction draws or co-operative apartments. The desk finances completed properties only and never finances co-ops.
• A primary residence in an investment-only state. In states such as New York and Massachusetts, the desk lends on investment property only.

The non-QM versus conventional jumbo comparison sets out the trade-offs, including that alternative-documentation pricing reflects the documentation type, among other factors.

How does a CPA bring a client to the desk?

Call Mayer Dallal directly at (844) 405-1935, or have the client use the site with your name in the Referred by field, and you will have a scenario answer within one business day.

The scenario needs four facts: occupancy, state, approximate loan amount, and how the client is paid. No returns, no Social Security number, no credit pull. The client's first step is a 15-minute call with Mayer, who reads every inquiry and makes the call himself. If the file goes forward, one banker owns it to closing, documents upload through the Aura portal, and terms are given in writing before anything is signed.

The relationship carries no economics. Under RESPA Section 8, no referral fee or anything of value passes in either direction: we pay you nothing for an introduction, and you pay us nothing. That is not a courtesy policy; it is federal law, and it keeps your recommendation independent.