Start by selecting the SBA program that matches your deal. Choose SBA 7(a) if you are financing a business acquisition, purchasing equipment, or need working capital. Choose SBA 504 if you are buying or building owner-occupied commercial real estate or making a major fixed-asset purchase. Not sure which program fits? Read our comparison below or visit the SBA loan programs overview.

Next, enter your loan amount (the calculator supports $50K to $5M for 7(a) and up to $5.5M for 504). Set the interest rate using the current Prime Rate plus the lender spread. Most SBA 7(a) borrowers pay Prime + 2.75%, so start there unless your lender has quoted a specific rate. Adjust the loan term: up to 25 years for real estate, 10 years for equipment, and 7–10 years for working capital.

The calculator instantly generates your estimated monthly payment, total interest over the life of the loan, and the SBA guarantee fee. Click “View Amortization Schedule” to see a month-by-month breakdown of principal and interest. Use this output to stress-test your deal’s cash flow before submitting a loan application.

If you want a personalized assessment with exact lender terms, book a free strategy call with our capital advisory team. We match your deal to the right SBA lender from our network of 500+ capital sources.

SBA 7(a) vs 504: Which Program Fits Your Deal?

The two flagship SBA programs serve different purposes, and choosing the wrong one costs borrowers time and money. Here is a practical breakdown based on hundreds of deals our advisors have placed.

SBA 7(a) is the most flexible program. It covers business acquisitions (including goodwill), equipment purchases, working capital, and commercial real estate. Loan amounts go up to $5 million with terms up to 25 years for real estate and 10 years for equipment or working capital. The interest rate is variable, typically Prime + 2.25% to Prime + 3.0% depending on loan size and borrower qualifications. Most borrowers put 10–20% down. SBA 7(a) is the go-to program for business acquisition financing because it covers intangible assets like goodwill that conventional lenders will not finance.

SBA 504 is designed specifically for major fixed-asset purchases: owner-occupied commercial real estate and heavy equipment with a useful life of 10+ years. The structure is unique — the borrower puts 10% down, a conventional lender provides 50%, and a Certified Development Company (CDC) provides the remaining 40% at a fixed rate tied to U.S. Treasury bonds. The CDC portion is fixed for 20 or 25 years, which protects borrowers from rising rates. Total project costs can exceed $5.5 million when combining the bank and CDC portions. For manufacturers, the CDC portion limit increases to $5.5 million under the MARC 504 program.

Rule of thumb: If your deal is primarily real estate, use 504 for the fixed-rate advantage. If your deal involves an acquisition, working capital, or a mix of uses, use 7(a) for its flexibility. PeerSense evaluates both programs for every eligible deal to identify the lowest blended cost of capital.

Current SBA Loan Rates

SBA 7(a) interest rates are variable and tied to the Wall Street Journal Prime Rate, which is itself derived from the Federal Funds Rate published by the Federal Reserve (the FRED database tracks this as series DPRIME). Lenders add a spread on top of Prime, and the SBA caps the maximum spread based on loan size and maturity.

For loans over $350,000 with maturities greater than 7 years, the SBA maximum spread is Prime + 3.0%. Most qualified borrowers pay Prime + 2.75%. Borrowers with 30%+ down payment, 700+ FICO, strong liquid capital, and high net worth may qualify for the best rate of Prime + 2.25%. For loans under $350,000, the maximum spread is Prime + 3.75%.

SBA 504 rates on the CDC portion are fixed and set monthly based on a spread above the current 5-year and 10-year U.S. Treasury rates. These rates are typically lower than SBA 7(a) variable rates, which is why 504 is often the better choice for real estate purchases when rates are elevated.

Check the live Prime Rate and current Treasury yields on our market rates dashboard. Understanding where rates stand today directly impacts the accuracy of the calculator results above.

What Affects Your SBA Loan Payment?

Four variables determine your monthly SBA loan payment. Adjusting any one of them significantly changes your total cost of capital.

Down Payment

Most SBA loans require 10–20% down. A larger down payment reduces your loan amount (and therefore your monthly payment) and may qualify you for a lower interest rate. Some deal types — like business acquisitions with seller financing or partner buyouts — can structure the down payment creatively. Read our 2026 guide to SBA down payment requirements for a detailed breakdown by loan program and use case.

Loan Term

SBA guidelines set maximum terms by asset type: 25 years for commercial real estate, up to 10 years for equipment (matched to useful life), and 7–10 years for working capital. Longer terms lower your monthly payment but increase total interest paid over the life of the loan. For business acquisitions, the standard term is 10 years fully amortizing, though real estate included in the deal can extend the blended term.

Interest Rate

As described above, SBA 7(a) rates float with Prime. Every 25-basis-point move in Prime changes your monthly payment. For a $1 million loan over 10 years, a 0.25% rate increase adds roughly $12–$14 per month. While this seems small, the compounding effect over a 25-year real estate loan is substantial. Use the calculator above to model different rate scenarios and see the impact on your total interest cost.

SBA Guarantee Fee

The SBA charges a one-time guarantee fee on the guaranteed portion of every loan. The fee structure is tiered: loans under $150,000 pay 0%, loans from $150,000 to $700,000 pay 2%, loans from $700,000 to $1 million pay 3%, and loans above $1 million pay 3.5%. This fee is almost always financed into the loan balance, which means it increases your total borrowing amount (and therefore your monthly payment) without requiring additional cash at closing. Our calculator factors this fee into your payment estimate automatically.

Tips for Getting the Best SBA Loan Terms

• Strengthen your credit score. A FICO score above 700 unlocks the best SBA rates and highest approval odds. Most lenders require 680+ as a minimum.
• Prepare clean financials. Lenders want to see 2–3 years of tax returns, interim financial statements, and a clear debt service coverage ratio (DSCR) above 1.25x.
• Consider SBA 504 for real estate. If you’re buying or building commercial property, the 504 program’s fixed-rate CDC portion can save tens of thousands over the life of the loan compared to a variable 7(a).
• Shop multiple lenders. SBA rates have a maximum spread, but lenders set their own rates within that range. A capital advisor can introduce you to lenders offering the most competitive terms for your deal type.
• Ask about the MARC program. The MARC loan program offers enhanced SBA terms for manufacturers, including higher loan limits and favorable fee structures.
• Finance the guarantee fee. Rolling the SBA guarantee fee into your loan preserves cash at closing without significantly increasing your monthly payment.

When an SBA Loan Isn’t the Right Fit

SBA loans offer some of the best terms available to small businesses, but they’re not always the fastest or most flexible option. If you need funding in under 30 days, require more than $5 million, or have a deal structure that doesn’t fit SBA guidelines, alternative programs like equipment financing, conventional commercial loans, or private credit may be a better path. PeerSense evaluates every deal across 75+ capital sources to find the right match — not just the obvious one.

How PeerSense Helps You Get the Best SBA Loan

PeerSense is not a lender. We’re a commercial lending firm that matches your deal with the right SBA lender based on loan size, industry, geography, and deal complexity. Our advisors have placed hundreds of SBA loans and know which lenders move fastest, offer the best rates, and specialize in your industry. Our referral fee is established upfront and paid at closing. No retainers.

Use the calculator above to estimate your SBA loan payment, then book a free strategy call to get a personalized assessment. We’ll tell you exactly what you qualify for, which program fits best, and introduce you directly to the right lender.