Securities-based lending strategies: Understanding fixed vs. floating rates

By Robert Bukowski

As monetary policy evolves, it's understandable that consumers would look for lower borrowing costs. But rates are only one part of the decision when it comes to lending options. With securities-based lending (SBL), flexibility and risk management matter just as much.

If you’re evaluating a promotional loan against the securities in your portfolio, there are several factors to consider, including what this kind of structure lets you do as well as what it could prevent you from doing if your needs or the markets change. Here’s what you should know.

Key details to evaluate in promotional loan offers

Look closely at many of these offers and a pattern emerges: They tend to apply to brand-new borrowing, meaning your existing balances may not be eligible for the promotional rate.

If you already have an SBL balance, ask whether repricing is available, what the new requirements are and whether there are fees, term commitments or collateral impacts associated with moving to the promotional rate.

If the pitch is debt consolidation, where you’d roll your existing liabilities into the new loan to capture the promotional rate, focus on the fundamentals: the all-in cost, the expected holding period and the flexibility to adjust if your plan changes.

SBL flexibility trade-offs to consider with fixed rates

A promotional fixed rate for one or three years can look attractive on the surface, but it may come with the trade-off of reduced flexibility. Understand if the loan has prepayment penalties, for example. If it does, you may be committing not just to a rate but also to a timeline for repayment. That matters, because you may be using SBL precisely for optionality – that is, the ability to access liquidity while keeping your investments intact – which can have its own value based on your specific needs and goals.

Prepayment penalties typically apply only to fixed rates and not to floating, or variable, rates, and they are usually derived from two components. Both are worth understanding before you sign anything:

The practical takeaway is simple but easy to overlook in the moment: The detailed conditions of any loan you take against the securities in your portfolio need to genuinely match your intended use and your realistic repayment timeline. While the rate may “look better,” a 12-month promotional offer may be a good fit only if you need the money for 12 months on those specific terms.

Let's consider a hypothetical example. Say you borrow $1 million against your portfolio, choosing between a fixed 12-month promotion at 5.05% and remaining variable at SOFR (Secured Overnight Financing Rate) + 1.25%. What has to happen for the fixed rate to actually win?

SOFR sits at roughly 3.85% as of September 2026, which prices the variable alternative with a spread of 1.25% at about 5.10% – already a touch above the 5.05% fixed offer. For the two to cost the same over the full year, SOFR would need to average about 3.80%, 5 basis points below where it sits now.

In other words, unless SOFR falls from here, the fixed rate wins – but only by a hair. It's a marginal edge, not a compelling discount, and like any other financing decision, it depends on the trajectory of interest rates.

What happens if your plans change?

Now, in this hypothetical example, assume you need to repay in Month 8 due to a liquidity event, an asset sale, a change in plans, or a market pullback that shifts your view on debt exposure or – worse – triggers a margin call. This is where the two rate structures pull apart.

Under the fixed-rate loan rate, if the interest make-whole applies to the full committed term, you may owe close to the entire $50,500 in interest even though the money was outstanding for only 8 of the 12 months – an effective annualized cost of roughly 7.58% on the capital you actually used, before any swap redeployment charge is layered on top.

Under the variable loan structure, there's no penalty in this scenario. You'd owe interest only for the eight months the money was actually outstanding – about $34,000 – and your full $1 million is released at no additional cost.

The gap – roughly $16,500 in this example, before any swap breakage cost – isn't a rounding error. It's the price of certainty, and it shows up only once your plans change. That's exactly why you want to ensure that all the parameters of a loan match how you'll realistically use the funds, not just the headline rate.

(Note: Figures are illustrative only, based on a hypothetical $1 million loan and SOFR near its current level of approximately 3.85%. Actual spreads and prepayment structures vary by lender and facility.)

How to evaluate SBL offers beyond the interest rate

When you evaluate an SBL strategy, it’s important to look beyond the advertised rate to the all-in economics and risk management across the scenarios you might realistically face. Let’s walk through some of them.

Matching your loan structure to your borrowing needs

If your borrowing need is genuinely short term, the question is whether a fixed promotion offers meaningful rate protection or if that trade-off is worth sacrificing some flexibility (prepayment penalties, a requirement to hold the full draw for the duration).

If your need is longer term, the picture changes. There can be real value in terming repayment out intentionally, deliberately choosing a loan structure that matches your needs rather than reaching for a shorter promotional handle. Above all, it comes down to what you're using the funds for and how you want to balance cash flow against interest rate risk.

If you have a longer-term need and want stability, a term structure with a competitive all-in rate can make sense, especially if it's paired with a prepayment option (say, the ability to prepay in full without penalty after 12 months). That combination may be worth looking for, because it's the difference between buying a rate versus creating a structure that still works for you when circumstances change.

SBL offer checklist: Questions to ask before you borrow

Securities-based lending carries different mechanics and different risks, including market and collateral considerations a mortgage doesn't have. If you’re considering a promotional rate, ask yourself:

The bottom line

The point isn’t that fixed-rate lending is an inferior option; it’s that a promotional headline rate is only one input. Your job is to confirm it supports your strategy. Both fixed-rate lending and variable-rate lending have a place, depending on what you’re looking for. But a headline rate isn’t a strategy – it’s a data point.  It may be worth speaking with a financial professional who can help you determine whether a promotional securities-based lending offer aligns with your goals.

View Disclosures