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Sole prop, LLC, or S-corp: what docs you send

Two self-employed borrowers can earn about the same and still hand a lender very different stacks of paper. The difference is often the business structure. How your business files its taxes decides which returns, schedules, and forms a lender reads, and it changes a few questions the lender has to answer before it can count your income.

Jeff Shin, Mortgage Loan Originator, NMLS #1041652 · Tuesday, November 10, 2026 · 7 min read

This post walks through the documents that usually go with each structure under the conventional rules lenders follow. It does not tell you which structure to choose for your business. That is a tax and legal decision for your tax preparer or attorney. It also does not predict whether a given file will be approved. For the general self-employed document list, see how self-employed borrowers document income for a mortgage.

Why the structure matters to a lender

Fannie Mae's Selling Guide says the legal structure of a business determines how its income or loss is reported for federal taxes, the taxes it pays, its ability to build capital, and how far the owner is personally liable. The guide names five main structures: sole proprietorships, partnerships, limited liability companies (LLCs), S corporations, and corporations. It says knowing the structure helps a lender judge how stable the business is and how involved the borrower is. Source: Selling Guide B3-3.5-02, Business Structures

Some things stay the same across all five. The lender generally wants a two-year history of your earnings, and it may verify them with your signed federal returns for the past two years, with all schedules attached, or with tax transcripts of those returns. Business returns are needed in some cases, and the guide allows one year of returns, or no business returns, when certain long-history conditions are met. The guide treats an owner of a quarter or more of a business as self-employed. Source: Selling Guide B3-3.5-01

Sole proprietor

A sole proprietorship is an unincorporated business owned and run by one person. Its income, expenses, and profit go on Schedule C of the owner's personal Form 1040. There is no separate business income tax return.

That makes this the shortest stack. Your personal returns, with Schedule C attached, are the main income documents. The lender still has to check that the business has enough steady cash flow to support both itself and the new mortgage, and whether the business could handle you pulling money out of it for personal bills.

If you get 1099 forms from clients, our post on how lenders count 1099 contractor income covers that side.

LLC

An LLC is a business structure set up under state law, and its federal tax treatment depends on how many members it has and what it elects. A single-member LLC is generally treated as part of its owner's return, a "disregarded entity," unless it elects to be taxed as a corporation. An LLC with two or more members is generally treated as a partnership unless it elects corporate treatment. Source: IRS, Limited liability company

So the documents follow the tax filing, not the name on your paperwork:

  • Single-member LLC taxed the default way: usually your personal returns with Schedule C, like a sole proprietor.
  • Multi-member LLC taxed as a partnership: the business return (Form 1065), your Schedule K-1 from it, and your personal returns.
  • LLC that elected S corporation treatment: the business return (Form 1120-S), your Schedule K-1, your personal returns, and any W-2 the business paid you.

For an LLC that files its own return, the Selling Guide asks the lender to check whether you actually received cash from the LLC, because profits may or may not be paid out to members. It also asks whether you personally guaranteed any of the LLC's loans. Your tax preparer can tell you which form your LLC files if you are not sure.

Partnership

A partnership reports its profit or loss on Form 1065 and gives each partner a Schedule K-1 showing that partner's share. The partnership itself pays no income tax on it. Each partner reports their share on their own Form 1040, whether or not they got any cash from the partnership.

For a partnership, the lender looks for three things: whether you guaranteed any partnership loans, whether you received a distribution, and your share of non-cash expenses that can be added back to the business cash flow. Expect to send the K-1s, your personal returns, and, when business returns are required, the Form 1065 for the same years.

S corporation

An S corporation elects to pass its income, losses, deductions, and credits through to its shareholders, who report them on their personal returns. The federal filing chart lists Form 1120-S and Schedule K-1 for the business, and Schedule E of Form 1040 for the shareholder. Source: IRS, S corporations

An S-corp owner may also be paid wages. The Selling Guide notes that an owner may receive wages or dividends in addition to their share of business income on the K-1. Source: Selling Guide B3-3.7-02 That is why an S-corp file often includes W-2s from your own company alongside the K-1s, personal returns, and Form 1120-S.

The guide adds a condition that surprises some owners. K-1 income from an S corporation can be used to qualify only if the lender documents that the income was actually paid out to you at about the level being counted, or that the business has enough liquidity to support taking that money out. When K-1s show a stable history of cash distributions at that level, the guide says no further proof of access or liquidity is needed. Source: Selling Guide B3-3.6-07

Corporation

A regular corporation (a C corporation) files Form 1120 and pays tax on its own net income. It pays profits to shareholders as dividends, reported on Form 1099-DIV, and shareholders report those dividends on their personal returns. When business returns are required, a lender will usually want the Form 1120 along with your personal returns and any 1099-DIV the corporation issued you.

A side-by-side checklist

  • Sole proprietor: personal returns with Schedule C.
  • Single-member LLC, default tax treatment: personal returns with Schedule C.
  • Partnership or multi-member LLC: personal returns, Schedule K-1 (Form 1065), and Form 1065 when business returns are required.
  • S corporation or LLC taxed as one: personal returns, Schedule K-1 (Form 1120-S), any W-2 from the business, and Form 1120-S when business returns are required.
  • C corporation: personal returns, any 1099-DIV from the business, and Form 1120 when business returns are required.

Any lender may ask for more. A year-to-date profit and loss statement is one possible addition; our post on when a lender asks for a year-to-date P&L covers when that happens.

If your structure changed

If you switched from a sole proprietorship to an LLC or an S corporation in the last two years, your returns will show the same work reported two different ways. Have both years ready, plus something that shows it is the same business. The Selling Guide lists examples of documents that can show how long you have owned a business, such as a letter confirming the business's Employer Identification Number, a business license, articles of incorporation, or a partnership agreement. Ask the lender early how it will read the change.

Questions to ask a lender

  • Based on how my business files, which returns do you need, and for how many years?
  • Do you need my business returns, or only my personal returns?
  • How will you confirm that the K-1 income was paid out to me?
  • Do my W-2 wages from my own company count separately from the K-1 income?

FAQ

Does an LLC always need business tax returns?

No. A single-member LLC taxed the default way usually reports on Schedule C, so its income shows up on your personal return. An LLC taxed as a partnership or S corporation files its own return, and a lender may ask for it.

Why does the lender care whether I took money out of my S-corp?

Because K-1 income can be taxed to you even if the business kept the cash. The Selling Guide only lets a lender count that income when it is shown to have been paid out to you, or when the business has enough liquidity to support paying it out.

Should I change my business structure before I apply?

That is a question for your tax preparer or attorney, not a mortgage blog. A change can affect how many years of history a lender sees under the new filing, so if you are thinking about one, mention it in your first conversation with a lender.

One thing to do

Pull your last two tax returns and note which business forms are attached: Schedule C, a K-1, or a separate business return. That tells you which part of the checklist above is yours. Then send a short note about your plans through Get In Touch.

Disclaimer: Jeff Shin, Mortgage Loan Originator, NMLS #1041652. Chicago. Equal Housing Lender. Not a commitment to lend.

Sources: Fannie Mae Selling Guide B3-3.5-02, Business Structures; B3-3.5-01, Underwriting Factors and Documentation for a Self-Employed Borrower; B3-3.7-02, Analyzing Returns for an S Corporation; B3-3.6-07, Income or Loss Reported on IRS Form 1065 or IRS Form 1120S, Schedule K-1. IRS, Limited liability company (LLC); IRS, S corporations.