Interest Rates

The Impact of Interest Rates on SBA Feasibility Studies

By David Jones, MAI, CCIM · Published 2026 · 8 min read

The interest rate environment shapes every feasibility study through a single mechanism: rates determine debt service, debt service determines DSCR, and DSCR determines whether the project is feasible. A 200 basis point change in the rate environment can move a project from clearly feasible to marginal, or from marginal to infeasible, with no change in the underlying business. Feasibility studies must model this sensitivity explicitly because the rate at the time of loan closing may differ from the rate environment when the study was prepared, and because variable-rate 7(a) loans will see the rate move throughout the loan term.

This guide covers how rates flow through the feasibility model, the fixed vs variable rate modeling distinction, current rate context as of April 2026, and what borrowers and lenders should expect from feasibility studies in the current environment.

How Rates Flow Through the Feasibility Model

The feasibility model calculates DSCR as NOI divided by total annual debt service. NOI is the business operating performance; debt service is the loan payment obligation. The interest rate determines debt service. Here is how a rate change flows through a typical $2 million SBA 7(a) real estate loan at 25-year amortization.

This $2 million loan example shows the mechanical relationship: at 7% the project looks comfortably feasible at 1.47x DSCR; at 9.75% it barely clears the SBA 7(a) Standard 1.15x minimum; at 12% it falls below 1.00x and the business cannot service its debt from operating cash flow. A 500 basis point swing from 7% to 12% on the same business reduces DSCR by 48%.

This is why feasibility studies cannot treat the rate environment as a fixed input. They must model rate sensitivity explicitly and identify the rate level at which the project becomes infeasible.

Current Rate Environment (April 2026)

As of April 2026, the current prime rate is 6.75%. SBA 7(a) fixed rates can range between 9.75% and 14.75% depending on loan terms. Variable-rate 7(a) loans price at Prime plus an SBA-capped spread based on loan size.

Not every lender charges the maximum. Some lenders price at Prime + 1.75% or Prime + 2.25% for well-qualified borrowers. The rate a specific borrower receives depends on credit quality, relationship with the lender, collateral coverage, and the lender's current pricing appetite.

SBA 504 loans operate differently. The CDC-funded debenture portion carries a fixed rate tied to Treasury rates plus a spread and fees, typically landing in the 6% to 7% range for FY2026 debentures. The first mortgage portion (funded by a bank) carries separate terms, often Prime-based and variable. A 504 project's blended debt service reflects both components.

Historical Rate Context

Understanding the rate environment over time helps contextualize current levels. The SBA 7(a) maximum rate has moved substantially over the past decade.

The practical takeaway: feasibility studies from 2019-2022 cannot be applied to 2025-2026 transactions without updating the rate assumptions. A project that showed 1.45x DSCR at 2020 rates may show 1.18x at current rates with no change in the underlying business. Conversely, feasibility studies prepared during the 2024 peak may now overstate debt service relative to current pricing, though the difference is smaller than it would be at peak-to-trough comparisons.

Fixed vs Variable Rate Modeling

SBA 7(a) loans can be either fixed-rate or variable-rate. The choice affects how the feasibility study should model debt service.

For variable-rate loans, rate sensitivity analysis is essential. A project that shows 1.30x DSCR at current 9.75% rates needs to be tested at hypothetical future rates. If Prime rises from 6.75% to 8.75% over the loan term, the variable-rate borrower's rate moves from 9.75% to 11.75%, and the DSCR compresses accordingly. The feasibility study should show whether the project can withstand this scenario.

For fixed-rate loans, rate lock eliminates variability. The DSCR calculated at origination remains the DSCR for the life of the loan (subject to the NOI side changing). The feasibility study still models base, optimistic, and pessimistic scenarios for revenue and expenses, but rate sensitivity on the debt service side is reduced to a secondary concern.

Rate Sensitivity Analysis in Feasibility Studies

Institutional-quality feasibility studies include explicit rate sensitivity testing for variable-rate projects. The standard sensitivity tests model DSCR at the base rate plus a series of increases.

The Prime +200bps scenario is the critical test for current-environment feasibility studies. It represents a plausible adverse rate scenario over a 5 to 7 year window. If the project can hold DSCR above 1.15x at Prime +200bps, it has meaningful rate tolerance. If it falls below 1.00x at that scenario, the project is overly exposed to rate risk and either requires more equity, a shorter amortization (if permitted), or consideration of a fixed-rate structure.

Rate Environment Effect on Project Viability at the Margin

The rate environment affects not just project structure but which projects are viable at all. Projects that were clearly feasible at 2020-2022 rates may be marginal at current rates, and projects that are marginal at current rates would be clearly feasible at a 2% lower rate environment.

Strategies for Rate-Sensitive Projects

When the feasibility study shows rate sensitivity is a material concern, several strategies can reduce exposure.

Increase equity injection. Smaller loan means smaller debt service means reduced rate sensitivity. Moving from 10% to 20% equity on a $2 million project reduces the loan by $200,000 and reduces annual debt service exposure by roughly $18,000 to $23,000.

Choose fixed-rate structure. The initial rate premium (0.75% to 1.50% above variable) is the cost of rate certainty. For projects where rate sensitivity is a material concern, the premium is often worthwhile.

Consider SBA 504 structure. The CDC debenture portion is fixed-rate at Treasury-indexed levels, typically producing a lower blended rate than 7(a) for real estate-heavy projects. A 504 with 6.5% fixed on the CDC portion and Prime-based variable on the bank portion can produce a blended rate below a 7(a) variable rate.

Shorten project scope. A smaller project requires a smaller loan, which scales down debt service and rate sensitivity. If the feasibility study shows a $3 million scope is rate-sensitive, consider whether $2.5 million scope achieves the business objectives with stronger DSCR cushion.

Wait for rate improvement. If the project is marginal at current rates but would be clearly feasible at rates 75-100 basis points lower, deferring the transaction until the Fed moves to a lower rate regime can be a rational strategy. This requires the borrower to have timeline flexibility and is not always available.

What to Expect from a Current-Environment Feasibility Study

Feasibility studies prepared in the current rate environment (April 2026) should include the following elements explicitly:

The current rate assumption used in the base case, cited from a specific source and dated to the study preparation period. Rate sensitivity analysis showing DSCR at base, Prime +100bps, Prime +200bps, and Prime +300bps for variable-rate loans. For fixed-rate loans, confirmation that the locked rate is used and a note that variable-rate sensitivity does not apply. Identification of the rate level at which DSCR falls below the SBA minimum (the "breakeven rate"). Comparison of projected DSCR across fixed vs variable structure if both are viable options for the project. A statement addressing whether the feasibility conclusion would change at rates 100bps higher or lower than the base case.

Studies that do not include explicit rate sensitivity analysis in the current environment are incomplete. Borrowers should request this analysis if it is not included in the draft, and lenders should treat its absence as a red flag.

For detailed DSCR methodology, see our blog post on understanding DSCR requirements. For financial projection methodology generally, see our financial projections page.