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SBA 504 loan rates and how the structure works

The SBA 504 funds owner-occupied real estate with a 50/40/10 split and a long fixed below-market rate. How it is built, what you put down, and 504 versus 7(a).

By The TreasuryClear Team Rates checked
A three-story red brick commercial building with a ground-floor storefront
Owner-occupied commercial real estate is exactly what the SBA 504 was built to finance, at a long fixed rate and a 10% down payment. Arian Fernandez via Pexels. Pexels License.

The SBA 504 loan funds owner-occupied commercial real estate and major equipment with a distinctive structure: a bank covers 50% of the project, an SBA-backed Certified Development Company covers 40% at a long, fixed, below-market rate, and you put down just 10%. That 10% is the headline. A conventional commercial mortgage usually wants 20% to 30% down, so the 504 lets a business buy its building while tying up far less cash.

The rate on the SBA portion is fixed for the whole term and priced below what a bank alone would charge, which is the other reason the 504 exists. It resets monthly at the debenture sale, so the exact number changes, but the structure and the advantages don’t. Here is how the whole thing is put together, and when it beats a 7(a).

The 50/40/10 structure

A 504 is really two loans and a down payment stacked on one project.

A bar split 50% bank first mortgage, 40% SBA CDC debenture, and 10% borrower down payment
Three parts fund one project. The 40% SBA debenture is the piece with the long fixed below-market rate; your down payment is just 10%. Editorial illustration, TreasuryClear.

The bank’s 50% first mortgage is a conventional loan at a conventional rate. The Certified Development Company’s 40% is funded by an SBA debenture, and that’s where the value sits: it’s fixed for the full 10, 20, or 25-year term and priced below the market. Your 10% down is the smallest piece, though special-purpose buildings (think a restaurant or a car wash) or a brand-new business may push it to 15% or 20%. The tradeoff for all this is that the 504 is narrow: it’s for owner-occupied real estate and long-life fixed assets, not working capital.

A modern multi-story commercial building complex
Owner-occupied means your business uses the majority of the space. The 504 finances the building you operate from, not investment property you rent out. Diana via Pexels. Pexels License.

Where the rate comes from

The 504’s fixed rate isn’t set by a bank’s whim. The SBA debenture is sold to investors each month, and its rate is pegged to Treasury yields, the 10-year for 20 and 25-year debentures, plus a spread. On top of the debenture rate sit ongoing fees to the SBA, the CDC, and a central servicing agent, which together add a fraction of a percent. The sum is your effective rate, fixed for the life of the loan.

Because it resets at each monthly debenture sale, there is no single “504 rate” to quote that stays true. The honest move is to check the current month’s rate with a CDC, and to watch the 10-year Treasury the debenture is priced against, which is what moves it. What doesn’t change is that the rate is fixed once you close, which is the 504’s biggest edge over a variable loan in an uncertain rate environment.

A steel-frame commercial building under construction with a tower crane
The 504 finances construction and major renovation too, not just a purchase, as long as your business will occupy the finished building. SSJF01 via Wikimedia Commons. CC0.

504 or 7(a): match the loan to the job

The two flagship SBA loans get confused constantly, but they’re built for different jobs. The 504 is a real-estate and heavy-equipment loan: long, fixed, low down payment, narrow in what it can fund. The 7(a) is the flexible workhorse: working capital, acquisitions, refinancing, mixed uses, usually at a variable rate up to the SBA cap.

Two panels: use a 504 for owner-occupied real estate and equipment with a fixed rate, use a 7(a) for working capital and acquisitions with flexibility
Match the loan to the job. For owner-occupied real estate, the 504's fixed rate and low down payment often win; for everything else, the 7(a)'s flexibility does. Editorial illustration, TreasuryClear.

If you’re buying a building, run both. A 7(a) can fund real estate too, but the 504’s lower down payment and fixed rate frequently make it cheaper over the life of the loan. The SBA payment calculator will price a 7(a) so you have a number to compare, and the financing router places both against your other options. This is a summary of the public 504 structure, not a rate quote or advice: the current debenture rate and your eligibility come from a CDC and your lender.

Frequently asked questions

How is an SBA 504 loan structured?

A 504 funds a project in three parts: a bank lends 50% as a first mortgage, a Certified Development Company lends 40% backed by an SBA debenture, and you put down 10%. The SBA portion carries a long, fixed, below-market rate. Special-purpose properties or new businesses may need to put down 15% to 20%.

What is the SBA 504 interest rate?

The 40% SBA debenture carries a fixed rate set at the monthly debenture sale, priced at a spread over Treasury yields (the 10-year for 20 and 25-year debentures) plus SBA and servicing fees. It is fixed for the full term and typically below a conventional commercial mortgage. Because it resets monthly, check the current rate with a CDC before you plan around a number.

Should I use a 504 or a 7(a) loan?

Use a 504 to buy or build owner-occupied real estate or major equipment, when you want a long fixed rate and the lowest down payment. Use a 7(a) for working capital, an acquisition, refinancing, or mixed uses, when you want flexibility and can accept a variable rate. For a real-estate purchase, the 504 often costs less; run both before assuming the 7(a) is the answer.