SOFR and Loan Pricing: How Floating Rates Flow Through to Payments

Most commercial real estate borrowers understand that floating-rate loans adjust over time. What's less clear is exactly how those adjustments happen—how a published benchmark like SOFR turns into the interest rate on your statement, and ultimately, the payment you wire each month.

This article walks through the mechanics of SOFR-based loan pricing, from rate calculation to payment adjustment. You'll see how lookback periods work, why payment amounts change, and what to expect when your loan reprices.

What SOFR Actually Measures

SOFR stands for Secured Overnight Financing Rate. It reflects the cost of borrowing cash overnight, secured by U.S. Treasury securities. The rate is published daily by the Federal Reserve Bank of New York and represents transactions worth hundreds of billions of dollars each day.

Because SOFR is an overnight rate, lenders don't use the daily figure directly. Instead, they calculate an average over a defined period—typically 30, 90, or 180 days. This smooths out day-to-day volatility and produces a stable reference rate for loan pricing.

Your loan agreement will specify which SOFR term structure applies. A 30-day average means the lender looks back at the past month of daily SOFR readings, averages them, and uses that figure as the base rate for your loan. This averaged rate is sometimes called Term SOFR or Average SOFR, depending on the calculation method.

How the Spread Gets Added

SOFR alone doesn't determine your interest rate. Lenders add a spread—a fixed number of basis points—to cover credit risk, operating costs, and profit margin. The spread is negotiated at closing and stays constant throughout the loan term.

If your loan is priced at 30-day Average SOFR plus 250 basis points, and the current 30-day average is 4.75%, your all-in rate is 7.25%. When SOFR moves, your rate moves by the same amount. If SOFR rises to 5.00%, your rate becomes 7.50%.

The spread reflects your deal-specific risk profile. Stronger sponsors, lower leverage, and stabilized assets typically command tighter spreads. Construction loans and higher-leverage transactions carry wider spreads. Once set, the spread doesn't change unless you refinance or modify the loan.

Lookback Periods and Rate Locks

Most SOFR-based loans use a lookback period, which means the rate applied to a given payment period is based on SOFR readings from a prior window. A common structure is a two-business-day lookback for 30-day Average SOFR.

Here's how it works in practice. Suppose your loan reprices on the first of each month. The lender calculates the 30-day Average SOFR ending two business days before the repricing date. That average becomes your base rate for the upcoming month.

The lookback ensures the lender has time to calculate the rate and notify you before payment is due. It also means your rate is slightly lagged—it reflects recent market conditions, but not the absolute latest data. In stable rate environments, this lag is negligible. During rapid rate changes, it can create a small timing mismatch between market moves and your loan rate.

From Rate to Payment: The Calculation

Once the lender determines your all-in rate, calculating the payment is straightforward. For interest-only loans, you multiply the outstanding principal by the annual rate, then divide by twelve (or by the actual number of days in the period, depending on the day-count convention in your loan documents).

For amortizing loans, the lender recalculates the payment each time the rate adjusts. The new rate is applied to the remaining principal balance, and the payment is sized to fully amortize the loan over the remaining term. This means your payment can change for two reasons: a rate adjustment or a change in the remaining balance and term.

Most loan servicing systems automate this calculation. You'll receive a payment notice before each adjustment, showing the new rate, the new payment amount, and the effective date. Review these notices carefully—they're your primary tool for tracking how rate changes affect cash flow.

Payment Caps and Floors

Some floating-rate loans include payment caps, which limit how much your payment can increase in a single adjustment period or over the life of the loan. These caps provide budgeting certainty but often come with trade-offs, such as higher spreads or the potential for negative amortization if the cap prevents the payment from covering accrued interest.

Rate floors are more common. A floor sets a minimum level for the base rate (SOFR), ensuring the lender earns at least a certain return even if the benchmark falls to zero or below. If your loan has a 1.00% SOFR floor and the 30-day average drops to 0.75%, the lender uses 1.00% as the base rate. Your all-in rate becomes the floor plus the spread.

Floors were especially relevant during the low-rate environment of recent years. As rates have risen, many floors are now well below current SOFR levels and have no practical impact. Still, it's worth knowing whether your loan includes a floor and where it's set, in case rates decline again.

Managing Cash Flow Around Adjustments

Floating-rate loans require active cash flow management. You need to anticipate rate changes and budget for higher payments if rates rise. Many borrowers track SOFR daily or weekly, using the published averages as a leading indicator of upcoming adjustments.

Some sponsors build payment reserves into their operating budgets, setting aside funds each month to cover potential rate increases. Others use interest rate caps—derivative contracts that limit your effective borrowing cost—to hedge against rising rates. Caps aren't free, but they convert unpredictable rate risk into a known upfront cost.

Communication with your lender is also important. If you expect a rate adjustment to strain cash flow, discuss options early. Some lenders will work with borrowers to adjust amortization schedules, extend terms, or restructure loans to ease payment pressure, especially if the underlying asset remains strong.

Frequently Asked Questions

How often does my loan rate adjust?

Most SOFR-based loans reprice monthly, though some adjust quarterly or at longer intervals. Your loan agreement specifies the repricing frequency. Monthly adjustments track market rates more closely but require more frequent payment recalculations.

Can I lock in my rate after closing?

You can't convert a floating-rate loan to a fixed rate without refinancing, but you can buy an interest rate cap to limit your exposure. A cap sets a maximum rate you'll pay, even if SOFR rises above that level. The lender continues to charge the floating rate, but the cap counterparty reimburses you for any excess.

What happens if SOFR spikes suddenly?

Because most loans use a 30-day or 90-day average, a single-day spike in SOFR has minimal impact. The averaging smooths out short-term volatility. A sustained increase over weeks or months will flow through to your rate, but you'll see it coming as the average trends upward.

Do I get notified before my payment changes?

Yes. Lenders typically send a payment notice several days before each adjustment, showing the new rate and payment amount. Review these notices promptly and confirm the calculations match your loan terms. If you spot a discrepancy, contact your lender immediately.