Does a K-1 Partner Need a CPA Letter for a Self-Employed Mortgage?

The Quick Read: Usually not, but it depends on the loan program and on whether your ownership share is already clear from other documents. On a bank statement loan, the letter is most often optional, and it mainly proves your ownership percentage or supports a lower expense factor. On a DSCR rental loan, it generally never comes up, because the property’s rent carries the file.

• DSCR rental loan: qualification rests on the property’s rent against its payment, so a K-1 or CPA letter is not part of the income test.
• Bank statement loan: a letter is optional on most programs, and each lender’s guidelines decide.
• What the K-1 proves: your ownership share, which is often the very thing a letter would otherwise confirm.
• Where a letter helps: proving ownership when the K-1 is silent, or documenting a lower expense ratio.
• Who decides: the lender, never the CPA.

This question is about a mortgage lender’s request. It is not about whether a CPA must prepare or issue your K-1s, which is a tax-compliance topic.

What a K-1 Already Proves (and What It Can’t)

A K-1 proves your share of the partnership’s reported income. The IRS Partner’s Instructions for Schedule K-1 say the partnership uses the form to report your share of its income, deductions, and credits. Box 1 shows your share of ordinary income or loss from the business.

Here’s the catch. The same IRS instructions say you may owe tax on your share of partnership income whether or not it was distributed. So a K-1 can show income you never received in cash. It can also show a loss created by depreciation and deductions while the business throws off plenty of cash.

That gap is why lenders treat K-1 income carefully. It is also why a K-1 alone does not always settle the question a lender is asking.

Does a K-1 Partner Need a CPA Letter on a Bank Statement Loan?

Usually no. Across the wholesale network Lendmire works with, a CPA letter is optional on most bank statement programs. It becomes useful in two situations.

The first is ownership. If you use business deposits, the lender reduces them by an expense factor and then by your ownership share. The K-1 normally proves that share. When it does not, a letter from the business’s accountant can fill the gap. An operating agreement can do the same job.

The second is the expense factor. Programs apply a default expense factor to business deposits, and the factor varies by lender. A CPA who will certify a lower, accurate expense ratio can raise your qualifying income. A few lenders in the network accept that letter. Others stick to their own factor regardless. Never assume one formula applies.

Here is how the pieces usually fit, subject to lender guidelines:

On bank statement loans, qualification runs on documented income under the applicable program, subject to lender guidelines. Typical features include 12 months of statements, loan sizes from roughly $125,000 to $3,500,000, and reserves around 6 months of the housing payment. Leverage on a primary residence can reach 90% on a purchase or rate-term refinance for stronger files.

What About a DSCR Loan?

Generally no. DSCR loans are designed for non-owner-occupied investment properties. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage.

The file qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. Your K-1, the partnership return, and any CPA income letter sit outside that test. A partner whose K-1 shows little income after depreciation can still buy a rental on its own cash flow.

“No income test” does not mean no paperwork. The file still needs credit, reserves, entity documents if you buy in an LLC, the purchase contract, and an appraisal with a rent schedule. Lendmire’s complete DSCR loans guide walks through that list.

Programs with coverage below 1.00 are available through select lenders in the network. Leverage and terms adjust when coverage is thin. The property still has to carry the file.

When You Probably Don’t Need a Letter

You probably don’t need one if all of these are true:

• Your K-1 shows your ownership percentage.
• The K-1 matches the partnership return and the operating agreement.
• You are buying a rental on DSCR terms.
• Your down payment and reserves come from personal accounts.

Skipping the letter also removes a third-party dependency. Your CPA is busy, and a late letter can stall a file. That alone is a reason to pick the program that does not need one when your goals allow it.

When a Letter Typically Does Come Up

A few patterns bring the request on alt-doc files:

1. Ownership is unclear. The K-1 omits the percentage, or the percentage differs from the agreement.

2. Your history is short. You joined the partnership recently.

3. You want a lower expense factor. Only an accountant can credibly certify it.

4. Business money funds the deal. Pulling the down payment from the partnership can raise questions about whether the business stays healthy.

5. Multiple entities. Several partnerships or companies make the picture hard to read.

Even then, the letter does not replace the K-1, the traditional personal-income documentation, or the bank statements. It supplements them.

Agency Loans, For Contrast

Standard agency-style full-documentation loans work differently, and they are not what this article is about. That type of loan verifies ownership through business income documentation, including the K-1. If those do not show it, a letter from the business’s accountant or similar documents can fill the gap.

So even there, the letter is a fallback for proving ownership, not a standing requirement.

What a Partner’s Letter Should Say

If your lender does ask, ask for its exact wording before you call your CPA. Lenders differ, and a letter that misses their template wastes time. A good partner letter typically covers:

• The CPA’s name, license, and letterhead, with signature and date.
• Your legal name, matching your loan application.
• The business name, entity type, and tax ID.
• Your ownership percentage.
• How long the business has operated.
• Where requested, the expense ratio, or whether withdrawing business funds would harm operations.

Keep the placeholder structure simple: “I have prepared the tax returns for [business name] and confirm that [your name] holds a [percent] ownership interest and has operated the business for [length].”

Two limits matter. You cannot write your own letter. And a CPA will often decline broad comfort statements, such as promising the business will stay healthy. That is normal. The lender, not the CPA, decides whether you qualify.

Percentages That Don’t Match and Other Snags

Documents disagree more often than you would expect. A few fixes:

• K-1 percentage differs from the operating agreement. Fix the paperwork first. Capital share and profit share can legitimately differ, and the lender needs to know which one applies.
• K-1 is late. An extension means the K-1 may not exist yet. Ask the lender what it accepts in the meantime, such as the prior year’s K-1 with a year-to-date profit and loss statement.
• The partnership’s CPA is not your CPA. The entity’s preparer knows the ownership picture. Your personal preparer may not. The letter should come from whoever can honestly attest to it.
• The CPA won’t sign. Ask the lender whether an operating agreement, state filing, or a profit and loss statement can serve instead.

Under 25% ownership, many underwriters treat K-1 income differently, often asking for distribution history or proof the business has cash. Under-25% partners are the group most likely to be steered toward bank statements or DSCR.

Which Path Fits Which Partner

Picture a partner whose K-1 shows a small taxable profit because of heavy depreciation. She wants a fourplex. DSCR fits: the rent covers the payment, and her K-1 never enters the test.

Now say a partner with a clean K-1 wants to buy his own home. A bank statement program fits, using deposits averaged over 12 months. His K-1 proves his share. A letter only matters if his true expenses are low and he wants that reflected.

One more case. A partner joined the business last year and the K-1 arrives late. A bank statement file may need ownership proof from the accountant, while DSCR sidesteps the issue because it qualifies on the property’s rental income rather than the borrower’s. That only helps on an investment purchase, though. On a home purchase it is not a toss-up, since DSCR only works for investment property and the bank statement route is the one that applies.

Occupancy decides the disclosure rules too. An owner-occupied purchase or cash-out is a consumer mortgage, and consumer disclosure rules apply. A bank statement loan on a non-owner-occupied rental is business-purpose. Cash-out on owner-occupied property tops out around 80% LTV, and investment-property cash-out tops out near 75%. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.

Tax treatment varies; consult a qualified professional.

For a related walkthrough, see Lendmire’s piece How K-1 Partner Income Is Counted on a Self-Employed Mortgage. Reach the team at 828-256-2183.

For deeper background on the mechanics discussed here, see CFPB ATR/QM Small Entity Compliance Guide.

Yes. A DSCR loan generally never asks for it. A bank statement loan often treats it as optional. Agency-style full documentation uses it as a fallback for proving ownership. Each program’s own guidelines decide, and every file is underwritten individually, not a commitment to lend.

About Lendmire

A DSCR-focused mortgage broker, Lendmire (NMLS# 2371349) places investor financing across 41 markets — 40 states plus Washington, D.C. — with DSCR eligibility generally reviewed by the lender on property cash flow instead of tax returns, subject to lender guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in 2025 and 2026.

References

1. IRS Partner’s Instructions for Schedule K-1 (Form 1065)

2. CFPB ATR/QM Small Entity Compliance Guide