SBA 504 Payment Calculator

An SBA 504 loan splits the total project cost into three pieces: a bank first mortgage (50%), a CDC debenture backed by the SBA (40%), and a borrower down payment (typically 10%). This calculator estimates your combined monthly payment by calculating each portion separately, so you can see exactly what the bank costs, what the SBA portion costs, and what the total looks like. If you are structuring a 504 deal for a client, this is the fastest way to set payment expectations before you start talking to lenders.

How the SBA 504 Loan Structure Works

The SBA 504 program is one of the few commercial loan programs that lets borrowers put down 10% and still get below-market fixed-rate financing. It works by splitting the project cost three ways:

The CDC debenture is the core benefit. It carries a fixed rate for the full loan term (10, 20, or 25 years), fully amortizes with no balloon, and is non-recourse on the SBA portion. The bank first mortgage sits in senior position and follows standard commercial lending terms, which the bank negotiates directly with the borrower.

SBA 504 Payment Breakdown: A Worked Example

Total project cost: $2,000,000

If you are running DSCR on this deal, the annual debt service is the combined payment from both loans. The property's NOI needs to cover both pieces, not just one.

Down Payment Requirements

The standard down payment is 10% of the total project cost. Two situations trigger higher requirements:

15% down payment: Required when the business is a startup (operating less than two years) or when the property is a special-use or single-purpose building. Examples of special-use properties include car washes, bowling alleys, hotels/motels, and gas stations.

20% down payment: Required when both conditions apply. A new business purchasing a special-use property needs 20% down.

These requirements come from SBA Standard Operating Procedure (SOP) 50 10 7. (Source: SBA SOP 50 10)

What's Included in "Total Project Cost"

Total project cost is not just the purchase price. The 504 program allows several additional costs to be rolled into the financing:

• Purchase price of land and building
• Construction or renovation costs
• Professional fees (appraisals, environmental reports, architectural/engineering)
• Furniture, fixtures, and equipment (if purchased alongside real estate)
• Closing costs and interim financing costs

The higher the total project cost, the more the 504 structure benefits the borrower, because 40% of a larger number at a below-market fixed rate creates more savings compared to conventional financing.

CDC Debenture Terms

The CDC portion offers three term options, each fully amortizing with no balloon payment:

The 25-year term is used most often for real estate acquisitions because it produces the lowest monthly payment and matches the useful life of the property. The 10-year term is reserved for equipment-only projects.

Effective Rate vs. Stated Rate

The CDC debenture rate published on sba.gov is the coupon rate on the debenture. The borrower's effective rate is slightly higher because it includes ongoing servicing fees. The CDC charges an annual servicing fee of approximately 0.625%, and the SBA charges a guarantee fee. These are bundled into the effective rate the borrower actually pays.

When quoting rates to a client, use the effective rate, not the coupon rate. The difference is typically 0.5% to 0.75%. Your CDC can provide the exact effective rate for the current debenture cycle.

Bank First Mortgage Considerations

The bank sets its own rate and terms on the first mortgage. Some things to watch:

The bank's loan is only 50% of the project cost, which means low LTV risk for the bank. This typically results in better pricing than a standalone commercial loan. Use this as a selling point when approaching banks that don't regularly participate in 504 deals.

Some banks offer fixed rates on their 504 first mortgages; others offer only adjustable. The bank term might be shorter than the CDC term (e.g., 10-year bank loan with a 25-year CDC debenture). If the bank loan balloons and needs to be refinanced, only the bank portion resets. The CDC debenture continues at its original fixed rate.

504 vs. Conventional Financing

The tradeoff is clear: 504 offers lower down payment and better long-term rate certainty, but requires owner-occupancy and takes longer to close. For businesses that qualify, the savings over a 25-year term can be substantial.

Frequently Asked Questions