Interest Rate
The cost of borrowing expressed as a percentage, structured in commercial lending as base rate plus lender spread, with total cost varying by product type, loan size, and fee structure.
Definition
In commercial lending, an interest rate is the annualized cost a lender charges for use of capital, almost always expressed as a base rate plus a lender-specific spread. Unlike consumer lending, where a single fixed APR dominates, commercial rates are constructed in layers: a benchmark rate (Prime, SOFR, or a Treasury yield) sets the floor, and the lender adds a spread that reflects borrower risk, loan size, collateral quality, and competitive positioning. The stated interest rate on a commercial loan is rarely the full cost of capital. Origination fees, SBA guarantee fees, closing costs, and prepayment penalties all contribute to the effective rate, which is why comparing loan offers on stated rate alone leads to poor decisions.
Why It Matters
The difference between a 7.75% and a 9.75% interest rate on a $1,000,000 commercial term loan over 10 years translates to roughly $130,000 in additional interest cost. That gap is wide enough to fund a full equipment upgrade or cover a year of payroll for a small team. Understanding how your rate is constructed, not just what number appears on the term sheet, determines whether you are getting a competitive offer or subsidizing a lender's margin.
Most commercial borrowers fixate on the stated rate while ignoring the spread structure beneath it. A lender quoting Prime + 2.50% today at 9.25% is offering a fundamentally different risk profile than one quoting a fixed 9.25%, because the variable rate will shift with every Federal Reserve decision. Knowing how to evaluate fixed versus variable structures is essential before signing any term sheet.
Rate comparison gets harder across product types. An SBA 7(a) loan at Prime + 3.00% with a 3% guarantee fee has a different effective cost than a conventional term loan at Prime + 4.50% with no guarantee fee. A merchant cash advance quoting a 1.35 factor rate translates to an APR that can exceed 60% depending on repayment speed. Without converting every offer to a common APR basis, you cannot make a legitimate comparison.
Common Mistakes
Comparing stated rates across different product types. A 12% APR on a term loan and a 1.25 factor rate on a merchant cash advance are not comparable numbers. Factor rates do not account for repayment speed, compounding, or fees. Always convert to APR or total cost of capital before comparing.
Ignoring the spread structure on variable-rate loans. A quote of "Prime + 2.00%" sounds low, but if Prime rises 100 basis points over two years, your effective rate increases by the same amount with no cap in many conventional products. SBA 7(a) loans cap maximum spreads by loan size, but conventional commercial loans often have no ceiling. Ask whether your rate has a cap, a floor, or both.
Treating the interest rate as the total cost. A loan at 8.00% with a 2% origination fee, a 3% SBA guarantee fee, and a $5,000 closing cost has an effective cost well above 8%. Lenders who advertise low rates often compensate with higher fees. Request the APR disclosure or calculate it yourself.
Overlooking rate reset frequency on variable loans. Some commercial loans reset monthly (common with SOFR-indexed products), others quarterly or annually. More frequent resets mean your payment changes faster when benchmarks move. This matters for cash flow planning, especially in businesses with seasonal revenue patterns.
Assuming the quoted rate is negotiable in the same way for every product. SBA lenders are bound by published maximum spreads and cannot exceed them regardless of negotiation. Conventional lenders set their own spreads with no regulatory ceiling. Understanding which products have capped rates and which do not changes your negotiation strategy entirely.
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How are commercial loan interest rates typically structured?
Most commercial loans use a base-plus-spread structure. The base rate is a published benchmark: Prime Rate (currently 6.75% ) for most small business and SBA loans, SOFR for larger institutional facilities, or a matched-maturity Treasury yield for fixed-rate Commercial Real Estate loans. The lender then adds a spread, typically ranging from 1.50% to 6.50% depending on the product, borrower creditworthiness, collateral, and loan size. For SBA 7(a) loans specifically, maximum spreads are regulated and tiered by loan amount: loans over $350,000 are capped at Prime + 3.00%, loans between $250,000 and $350,000 at Prime + 4.50%, loans between $50,000 and $250,000 at Prime + 6.00%, and loans under $50,000 at Prime + 6.50%. This layered structure means your rate is a function of both market conditions and your individual risk profile.
What is the difference between interest rate and APR on a commercial loan?
The interest rate reflects only the lender's charge for use of the principal. The annual percentage rate (APR) folds in origination fees, guarantee fees, closing costs, and other mandatory charges to express the true annualized cost. On a $500,000 SBA 7(a) loan at Prime + 2.75% (9.50%) with a 2.77% guarantee fee and a 1% origination fee, the effective APR is meaningfully higher than 9.50% once those upfront costs are amortized over the loan term. The gap between stated rate and APR grows larger on shorter-term loans because the fees are spread over fewer years. Always request both numbers when evaluating a commercial term loan offer, and use APR as your comparison baseline across products.
Why is SOFR replacing LIBOR in commercial lending?
LIBOR was retired as a benchmark because it was based on estimated interbank lending rates that were vulnerable to manipulation, as demonstrated by the rate-rigging scandal that resulted in billions in fines. SOFR (Secured Overnight Financing Rate) is based on actual overnight Treasury repurchase agreement transactions, making it a more transparent and manipulation-resistant benchmark. For commercial borrowers, the practical impact is that variable-rate loans originated after mid-2023 are almost universally indexed to SOFR rather than LIBOR. SOFR tends to be lower than LIBOR was for equivalent maturities, but lenders typically adjust their spreads to compensate, so the all-in rate is comparable. The key difference for borrowers is that SOFR is an overnight rate, so term SOFR (1-month, 3-month) includes a small credit spread adjustment that can change your payment timing slightly compared to old LIBOR-indexed loans.
How do I compare rates between an SBA loan, a conventional term loan, and a merchant cash advance?
You cannot compare these on stated rate alone because each product expresses cost differently. SBA 7(a) loans quote as Prime plus a spread with a separate guarantee fee. Conventional term loans quote as a fixed or variable rate with origination fees. Merchant cash advances quote a factor rate (e.g., 1.30) applied to the advance amount, with no annualization. To make a valid comparison, convert every offer to total cost of capital: the total dollars repaid minus the total dollars received, expressed as an annualized percentage. For example, a $200,000 MCA at a 1.30 factor rate repaid over 8 months costs $60,000 in fees, which annualizes to roughly 45% APR. An SBA 7(a) loan for the same amount at Prime + 3.00% with fees might run 11-12% effective APR. The factor rate "looks" lower at 1.30, but the APR tells the real story.
Should I choose a fixed or variable interest rate for my commercial loan?
The answer depends on your loan term, rate environment outlook, and cash flow sensitivity. Variable rates start lower than fixed rates because the lender is transferring interest rate risk to you. If you are borrowing for 3 years or less, the savings from a lower variable rate often outweigh the risk of rate increases, especially if you can absorb modest payment changes. For loans of 7 to 25 years, fixing the rate eliminates a significant source of uncertainty, particularly for Commercial Real Estate acquisitions where the debt service coverage ratio on the property must remain viable for the full term. Some borrowers split the difference with an interest rate swap or a loan that fixes for an initial period then converts to variable. There is no universally correct answer, but borrowers who choose variable rates should stress-test their cash flow against a 200 to 300 basis point increase to make sure the business can sustain higher payments without distress.
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