SBA 504 Personal Guarantee Requirements: Who Has to Sign

On an SBA 504 loan, everyone who owns at least 20% of the business generally signs a personal guarantee, and they sign on two separate loans: the bank's first-lien mortgage and the CDC's SBA-backed debenture. The guarantee is unlimited, which means each signer is on the hook for the full balance rather than a slice that matches their ownership.

The 30-second guarantee check

You will almost certainly have to sign a personal guarantee on a 504 loan if any of these is true:

• You own 20% or more of the operating company or the real-estate-holding entity that is borrowing.
• You and your spouse each own at least 5% and together own 20% or more, even if neither of you hits 20% alone.
• You are a managing member, general partner, or sole proprietor of the borrower.
• The lender considers you a key control person whose financial strength matters to the credit.

If none of those apply, you may still be asked for a limited guarantee. The rest of this post explains where each of those rules comes from and where lenders have discretion.

A 504 loan is actually two loans

The structure is the reason the guarantee question gets confusing. A 504 deal is typically structured 50/40/10: a third-party lender, usually a bank, funds about 50% of the project in first-lien position; a Certified Development Company (CDC) funds up to 40% through a debenture that carries a 100% SBA guarantee in second-lien position; and the borrower injects at least 10% of the project cost as equity (SomerCor 504 FAQ). The borrower's injection rises above 10% for start-up businesses and special-purpose properties.

The SBA portion is capped, the bank portion is not.

504 money is for fixed assets: owner-occupied commercial real estate and long-life machinery and equipment, plus certain refinancing. It cannot fund working capital, inventory, or passive rental real estate, and the program is for-profit businesses only (SBA 504 Loans). Because it so often finances a building, 504 deals usually run through an EPC/OC structure: an Eligible Passive Company holds the real estate and leases it to the Operating Company. That split matters for guarantees, which is covered below.

The practical takeaway: two loans means two sets of guarantee documents. The same people typically sign both, but the rules behind each are different.

The hard rule: who must guarantee

The baseline comes straight from the regulation. Under 13 CFR 120.160(a), "Holders of at least a 20 percent ownership interest generally must guarantee the loan." The SBA's own guarantee form restates it without the hedge: "Individuals who own 20% or more of a small business applicant must provide an unlimited personal guaranty" (SBA Form 148).

Two points trip people up. First, "unlimited" is literal: a 25% owner and a 60% owner sign the same full guaranty and each can be pursued for 100% of the balance. Second, the 20% test looks through entities. If you own 20% of the operating company and you own the EPC that holds the building, you are a guarantor on both counts.

Who guarantees the bank loan versus the CDC debenture

This is where the two-loan structure does real work. SBA's guarantee rules govern the SBA-backed debenture, the CDC's 40% piece. Three authorities set the floor for who must sign it: 13 CFR 120.160, SBA Form 148, and SOP 50 10 8 (effective June 1, 2025, per the SBA SOP page).

The bank's first-lien loan is ordinary commercial credit. SBA does not dictate who guarantees it. In practice, the bank requires the same 20%+ owners to guarantee its loan as a matter of its own credit policy, and it can require more: key managers, high-net-worth minority owners, or cross-guarantees between affiliated entities. SBA sets the floor for the debenture; the bank sets the ceiling for its own loan.

So plan on every 20%+ owner guaranteeing both loans, and ask the bank in writing whether it wants any guarantors beyond SBA's list before you assume the two guarantor sets match.

Owners under 20%: full, limited, or none

A sub-20% owner is not automatically a guarantor. But the regulation gives the SBA and the lender room: they "may require other appropriate individuals or entities to provide full or limited guarantees" when they judge it necessary (13 CFR 120.160(a)).

When a lender pulls a sub-20% owner into a guarantee, it usually uses the limited form. A full (unlimited) guaranty rides on Form 148 with no cap. A limited guaranty rides on SBA Form 148L and caps the guarantor's exposure using a payment-limitation option the lender selects in the loan authorization. The limited form is the standard tool for an owner who is below 20% but still material to the credit, such as a 15% partner who runs day-to-day operations.

Spouses and the EPC/OC structure

Two structural rules catch borrowers off guard.

Spousal aggregation. When each spouse owns at least 5% of the borrower and their combined interest reaches 20% or more, the lender will generally require both spouses to guarantee, even when neither individually crosses 20%. If you own 12% and your spouse owns 10%, the combined 22% triggers the rule (Florida First Capital, citing 13 CFR 120.160(a)). In community-property states, lenders also commonly ask a non-owner spouse to sign for collateral reasons even when ownership alone would not require it.

The EPC/OC structure. When the real estate sits in an Eligible Passive Company and the business runs through a separate Operating Company, both entities are part of the loan. The OC guarantees the EPC's debt, and the 20%+ owners of each entity guarantee as individuals. A common mistake is assuming that holding the building in a separate LLC shields the operating-company owners, or vice versa. It does the opposite: it adds an entity guarantee on top of the individual ones.

Every guarantor files a Form 413

The guarantee and the personal financial statement travel together. Each 20%+ owner and any person providing a guaranty on the loan completes SBA Form 413, which for a 504 loan goes to the CDC processing the application. The current form instructions require it to be dated within 120 days of submission for 7(a) and 504 programs, and some SBA-preferred lenders hold the file to a tighter window of their own.

If you have several guarantors, the slow part is rarely the form itself; it is chasing four people for current balances inside the same 120-day window so the package does not go stale mid-underwriting. StatementsReady generates a clean, current Form 413 for each guarantor and refreshes the balances when the window resets, which keeps a multi-guarantor file from aging out before the loan closes. For the line-by-line mechanics of the form itself, see the how to fill out SBA Form 413 walkthrough, and for the requirement set across the 7(a) and 504 programs, the SBA 7(a) personal financial statement requirements post.

When a guarantee can be limited or waived

There is no general mechanism to waive the personal guaranty of a 20%+ natural-person owner. SBA Form 148 and 13 CFR 120.160(a) state the requirement in mandatory terms. What looks like a waiver is almost always one of three real exceptions:

1. Limited guarantees for sub-20% owners. Form 148L caps exposure instead of eliminating it.
2. Entity guarantees for diffuse ownership. When no individual owns 20% (an ESOP, a cooperative, or certain trust arrangements), the requirement is generally met through entity-level guarantees and the guarantees of controlling trustees or managers, not by dropping the requirement.
3. Standby creditor agreements. SBA Form 155 subordinates seller or insider debt to the SBA loan. It changes payment priority; it does not remove anyone's personal guarantee.

The non-profit question that comes up with other SBA products does not apply here: the 504 program is for-profit businesses only, so the guarantee framework always assumes natural-person or entity owners who can sign.

What to do before you sign

1. Map the ownership. List every owner of the operating company and the EPC, then mark anyone at 20%+ individually and any couple at 20%+ combined. Those are your mandatory guarantors.
2. Get each guarantor's Form 413 current. Date them inside the 120-day window and keep the supporting balances ready to refresh if underwriting runs long. Run the totals through the free net-worth calculator if you want a second pass on the math.
3. Ask the bank for its first-lien guarantee terms in writing. The debenture follows SBA's rules; the bank's loan follows the bank's. Get the two guarantor lists on paper before closing.
4. Check your coverage. A 504 underwriter wants the project to cover its own debt service. You can run the ratio yourself in the free DSCR calculator before you apply.

For the broader workflow on the property side, the commercial real estate investor use case covers how owner-occupied 504 deals fit a real estate portfolio, and the co-signer financial statement use case covers what a guarantor's disclosure looks like. Guarantees are also the most-missed line on the personal financial statement itself; the Section 5 contingent liabilities post explains why an existing guarantee on another deal can affect this one. The full section-by-section reference lives in the SBA Form 413 guide, and more posts on program mechanics are in the SBA lending archive. If you would rather start from a structured template than a blank PDF, the SBA Form 413 template matches the section numbering exactly.

FAQ

Who has to sign a personal guarantee on an SBA 504 loan?

Every individual who owns at least 20% of the borrower generally must sign an unlimited personal guaranty on an SBA 504 loan, per 13 CFR 120.160(a) and SBA Form 148 (Unconditional Guarantee). Unlimited means each guarantor is liable for the full loan balance, not a share proportional to their ownership. The SBA or the lender may also require owners below 20%, key managers, or affiliated entities to guarantee on a full or limited basis.

Do I guarantee both the bank loan and the SBA 504 debenture?

Usually yes. A 504 deal is two loans: a third-party lender (typically a bank) holds roughly 50% in first-lien position, and the CDC holds up to 40% through an SBA-guaranteed debenture in second position. SBA's guarantee rules govern the debenture, but banks almost always require the same 20%+ owners to guarantee the first-lien loan, and a bank can demand more guarantors or stronger terms than the SBA does.

Can a personal guarantee be waived on an SBA 504 loan?

A true waiver for a 20%+ natural-person owner is rare and not contemplated by SBA Form 148 or 13 CFR 120.160(a). The real flexibility is in the form of the guarantee: owners below 20% can give a limited guaranty (SBA Form 148L) with a payment cap instead of an unlimited one, and ESOP or widely held ownership structures where no individual hits 20% are typically handled with entity-level guarantees. A standby creditor's agreement (SBA Form 155) subordinates seller or insider debt but does not remove a required personal guarantee.

Does my spouse have to guarantee my SBA 504 loan?

Possibly. When you and your spouse each own at least 5% of the borrower and together own 20% or more, the lender will generally require both of you to guarantee, even when neither individually hits 20%. In community-property states, lenders also frequently ask a non-owner spouse to sign for collateral purposes. The exact treatment is set by the lender and CDC within SBA's rules.

What is the difference between a full and a limited personal guarantee?

A full (unlimited) guaranty on SBA Form 148 makes the guarantor liable for the entire loan balance plus collection costs, regardless of ownership percentage. A limited guaranty on SBA Form 148L caps the guarantor's exposure using one of the payment-limitation options the lender selects in the loan authorization. SBA requires the unlimited form from 20%+ owners; the limited form is the tool lenders use for sub-20% owners or other individuals they want partially on the hook.

Do owners under 20% have to guarantee an SBA 504 loan?

Not automatically. SBA only mandates guarantees from holders of at least 20%. But 13 CFR 120.160(a) lets the SBA or the lender require other appropriate individuals or entities to provide a full or limited guarantee when they judge it necessary, so a sub-20% owner who is a key manager, a control person, or financially material to the credit is often asked to sign.

Is a personal financial statement required from each guarantor on a 504 loan?

Yes. Each 20%+ owner and any person providing a guaranty on the loan completes SBA Form 413 (Personal Financial Statement), which for a 504 loan is returned to the CDC processing the application. The current Form 413 instructions require the statement to be dated within 120 days of submission for 7(a) and 504 programs, and some SBA-preferred lenders enforce a tighter internal window of their own.