Does a Sole Proprietor Need a CPA Letter for a Self-Employed Mortgage?

The Quick Read: Not always. A CPA letter depends on the loan program and on whether the lender needs a third party to confirm something about the business, such as how long it has operated or what its expenses run. No blanket rule makes every sole proprietor get one.

• A rental-focused DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines, so a CPA letter is normally not part of the file.
• A bank-statement loan on documented income often asks a sole proprietor for a CPA, enrolled agent or tax-preparer letter.
• The letter usually confirms business tenure or certifies an expense ratio.
• It supports the file. It does not replace bank statements, returns or a profit-and-loss statement.
• The program sheet of the lender holding the file decides, not a general rule.

Here is how this plays out inside a sole proprietor’s file, where the letter helps, and what to do if the accountant says no.

Why a Sole Proprietor File Is Different

A sole proprietor has no separate business return and often no state registration. Income runs through Schedule C on the personal return. That leaves the underwriter with less third-party paper on the business itself.

A letter fills that hole. It tells the lender the business exists, who owns it, and how long it has been running. A corporation or LLC usually has a state filing that proves those things. A sole proprietor often has nothing equivalent, so the lender asks for a substitute.

Operators see this most on files where the borrower has been self-employed a short time, or where the business name was never registered anywhere. The question is not “can you prove income.” It is “can a third party confirm this business is real and active.”

When Does a Lender Ask for One?

A lender asks when the file has a gap a third party can close. These are the usual triggers.

Most programs we place files with treat the letter as a tool for a specific gap. A clean file with a long tenure and clear deposits often never gets the request.

Bank-Statement Loans: Where the Letter Shows Up

On a bank-statement loan, qualifying income comes from 12 months of business or personal bank statements. The underwriter averages eligible deposits and applies an expense factor to estimate overhead. Transfers between your own accounts and unexplained deposits come out.

Here is the catch. On owner-occupied cash-out, the program works with a fixed expense ratio, and leverage is typically capped lower when the ratio is accountant-prepared than when the fixed ratio is used, depending on loan size and credit. That is a cash-out consideration, not a purchase one. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.

If your real overhead sits below the default factor, a CPA letter certifying a lower ratio can raise qualifying income. That is the best case for getting one. If your overhead is high, the letter does nothing for you.

For purchase and rate-term on a primary residence, select lenders go up to 90% LTV, and stronger files earn the top of that range. Loan sizes run roughly $125,000 to $3,500,000, with reserves commonly around six months of the housing payment. Everything stays subject to lender guidelines and individual underwriting.

What the Federal Rule Actually Says

No federal rule names a CPA letter as a required document. The CFPB’s Ability-to-Repay compliance guide lists self-employment among the kinds of employment a creditor can consider. It also says a creditor must verify the income it relies on using reasonably reliable third-party records, and it does not have to verify extra income beyond what it needs.

So the standard is “reasonably reliable third-party records.” The lender’s program decides which documents meet it. Bank statements usually do. A CPA letter is one more way to meet it when something is missing.

What About DSCR Loans?

DSCR loans usually skip the question. They are business-purpose investor loans on non-owner-occupied rentals. Regulation Z exempts credit extended primarily for a business purpose, which is why the income-verification rule behind the CPA request does not drive these files.

The test is the loan’s primary purpose, not the label on the property. The ABA Banking Journal explains that an LLC guarantor does not turn a consumer-purpose loan into an exempt one. Purpose decides.

On a DSCR file the lender compares the property’s rent to the full payment. Rent comes from an appraisal rent schedule on a purchase or from a lease on a refinance. Then it reviews credit, appraisal, title and reserves, and sources the down payment through bank statements. There is no personal income to certify, so there is nothing for a CPA to certify about income.

DSCR does not mean no paperwork. Credit, assets, the appraisal, title and entity documents are all still reviewed. Where you want leverage detail, the complete DSCR loans guide covers it. Select lenders in the network also offer programs below 1.00 coverage, with LTV and terms adjusting.

Owner-Occupied vs. Investor: The Occupancy Split

Occupancy decides the regime. An owner-occupied file, meaning a primary residence or second home, is a consumer mortgage, and TRID disclosures apply. A bank-statement loan on a non-owner-occupied rental, including a short-term rental, is business-purpose and exempt from TRID.

That split matters for a sole proprietor holding both kinds of property. The primary residence may need bank-statement documentation and perhaps a letter. The rental next door may qualify on its rent alone. Same borrower, different paper trail. Investment-property cash-out on alt-doc tops out around 75% LTV, while investment purchase leverage varies by lender.

What a CPA Letter Typically Contains

Lenders tell the borrower what the accountant must confirm. The letter is usually short, signed, on firm letterhead. Typical contents:

• The preparer’s name, credentials and license information.
• Your name and the business name or DBA.
• How long the business has operated.
• Your ownership percentage.
• A statement that the business is active.
• For expense-ratio letters, the operating expense ratio the preparer supports.

Ignition Tax, a CPA firm, makes the point that the letter helps explain and verify returns and does not replace them. That matches what happens inside files. The letter never stands alone.

Who Can Sign It?

It depends on the lender and the program. Some accept a CPA only. Others accept an enrolled agent or a licensed tax preparer. Ask which, in writing, before you pay anyone.

If you prepared your own returns, a CPA may be reluctant to sign off on a business they did not prepare. An enrolled agent or tax preparer who reviews your records may be an acceptable substitute at some lenders. Confirm first.

If Your Accountant Won’t Sign

This happens. Accountants often decline broad “comfort” language, and most will not attest to future income. Options:

1. Ask the lender for the exact wording they need. A narrow, factual statement about tenure or ownership is far easier to sign than open-ended assurance.

2. Offer the accountant the lender’s own template rather than writing something new.

3. Ask whether an enrolled agent or tax preparer is acceptable.

4. Ask whether a business license, registration record or profit-and-loss statement closes the same gap.

5. If the letter is only there to certify an expense ratio, ask whether the default expense factor still gets you to the loan amount you need.

6. If personal income is the sticking point on a rental purchase, compare a DSCR structure that is reviewed on the property instead.

Letter vs. Other Documents

The Investor Decision

A sole proprietor who writes off heavy expenses shows low taxable income. Tax-return qualification then understates real cash flow. That is the reason alt-doc programs exist.

For a rental purchase or refinance, DSCR often removes the CPA step entirely. It saves the preparer fee and the risk of a refusal, and personal income does not affect qualification. Bank-statement loans stay useful when the same borrower needs personal-income qualification, such as a primary residence or a standalone equity line.

Asset depletion is another path. Qualifying from liquid assets runs up to about 80% LTV on a primary residence, and it avoids the letter question altogether for borrowers with the assets. Final terms depend on lender guidelines, property type, leverage, and the borrower’s complete credit picture.

Illustrative Scenarios

Long-tenured sole proprietor. Ten years of Schedule C filings, clean deposits, a registered business name. The file likely never needs a letter. Twelve months of statements carry it.

Recently started sole proprietor. Business under two years, no state registration. A tenure letter is a likely request, because nothing else proves the business exists.

Self-prepared returns. The borrower filed alone and has no accountant. An enrolled agent or preparer review may substitute. The lender confirms what it accepts before the borrower pays for anything.

Rental investor. A sole proprietor buying a rental wants leverage on the property’s rent, not personal income. DSCR lender review applies, and the letter question does not come up.

Common Mistakes

• Ordering the letter before asking the lender for the required wording.
• Names that do not match across the letter, returns and statements.
• Asking the accountant to state income they cannot verify.
• Assuming a letter replaces bank statements or a P&L.
• Assuming DSCR means no documents. Credit, assets and the appraisal are still reviewed.
• Assuming non-QM means stated income. It does not. Non-QM files still assess ability to repay and verify deposits.

What to Ask Your Loan Officer

• Does this program require a letter, or only offer it as an option?
• Who may sign it: CPA, enrolled agent or preparer?
• What exact wording or fields must it include?
• Does it replace the default expense factor?
• How recent must it be?
• Would a business license or P&L do the same job?

Key Terms Defined

CPA letter: A short signed statement from an accountant confirming facts about your business, such as tenure or ownership.

Expense factor: The percentage a lender subtracts from business deposits to estimate overhead.

Bank-statement loan: A mortgage that is reviewed on documented income under the applicable program, drawn from deposit averages, subject to lender guidelines.

DSCR: Debt service coverage ratio, the property’s rent measured against the full monthly obligation.

Schedule C: The tax form where a sole proprietor reports business income on a personal return.

Tax treatment varies; consult a qualified professional. Lendmire is a broker, not a lender. This is not a commitment to lend.

For current guidelines and terms, see Lendmire’s DSCR loan programs page.

About Lendmire

Lendmire — NMLS# 2371349 — is a DSCR and non-QM mortgage brokerage with investor loan programs in 41 markets, including Washington, D.C. DSCR eligibility is commonly reviewed by the lender around property-level rent rather than personal income documentation, subject to lender guidelines, and the brokerage helps arrange financing for LLC-owned portfolios beyond conventional financed-property limits. Recognized by Scotsman Guide as a Top Mortgage Workplace in 2025 and 2026.

Investors who want the broader program framework can review how DSCR loans work.

References

1. CFPB ATR/QM Small Entity Compliance Guide

2. CFPB Regulation Z § 1026.3

3. ABA Banking Journal: Compliance QOTM

4. Ignition Tax: How a CPA Letter Helps Self-Employed Mortgage Borrowers