SBLOC Interest Rates in 2026: What Borrowers Actually Pay

How SBLOC Interest Rates Are Calculated

Every securities-backed line of credit starts with a benchmark rate. In 2026, that benchmark is almost always the Secured Overnight Financing Rate (SOFR). Your lender adds a spread on top of SOFR, and the sum becomes your all-in borrowing cost.

As of May 2026, SOFR sits at approximately 4.3%. Lender spreads typically range from 1.5% to 3.5%, which means most borrowers pay between 5.8% and 7.8% on their drawn balances. Some ultra-high-net-worth clients with portfolios above $10 million see spreads as low as 0.75%.

Current All-In Rates by Portfolio Size

Portfolio size is the single biggest driver of your rate. Lenders price risk in tiers.

• $100,000 to $250,000: SOFR + 3.0% to 3.5%, all-in rates of 7.3% to 7.8%
• $250,000 to $500,000: SOFR + 2.5% to 3.0%, all-in rates of 6.8% to 7.3%
• $500,000 to $1,000,000: SOFR + 2.0% to 2.5%, all-in rates of 6.3% to 6.8%
• $1,000,000 to $5,000,000: SOFR + 1.5% to 2.0%, all-in rates of 5.8% to 6.3%
• $5,000,000+: SOFR + 0.75% to 1.5%, all-in rates of 5.05% to 5.8%

If your portfolio is close to a tier boundary, transferring additional assets to cross the threshold can save you 0.5% or more.

Rate Comparison: Fidelity vs Schwab vs Morgan Stanley vs Interactive Brokers

Each major brokerage prices SBLOCs differently. On a $500,000 portfolio of diversified equities and ETFs in May 2026:

• Fidelity (Pledged Asset Line): Approximately 6.5% — SOFR + 2.2%
• Charles Schwab (Pledged Asset Line): Approximately 6.7% — SOFR + 2.4%
• Morgan Stanley (Liquidity Access Line): Approximately 6.3% — SOFR + 2.0%
• Interactive Brokers: Approximately 5.8% — SOFR + 1.5%

For a deeper breakdown, see our 2026 SBLOC rates by broker comparison.

Fixed vs Variable Rate Options

Most SBLOCs carry variable rates tied to SOFR. When rates were near zero in 2021, borrowers paid under 2%. Today, that same facility costs 6% or more.

A few lenders offer fixed-rate tranches for draws above $250,000, locked for 6 to 24 months. The fixed rate typically adds 0.25% to 0.50% above the variable rate — an insurance premium against further hikes.

How SBLOC Rates Compare to HELOCs and Margin Loans

• HELOCs: Currently 8.2% to 9.5%. Require home appraisal, 30-45 days to close. See our SBLOC vs HELOC comparison.
• Margin loans: 5.0% to 12% depending on broker and balance. Purpose loans for buying securities — different product.
• SBLOCs: 5.5% to 8% for most borrowers. Non-purpose, no impact on investment strategy.

Tax treatment matters too — read our guide to SBLOC tax implications.

Key takeaway: Your SBLOC rate is negotiable. Moving from SOFR + 3.0% to SOFR + 2.0% on a $500,000 draw saves $5,000 per year in interest. Get quotes from at least three brokerages.

How to Negotiate a Lower Rate

Consolidate assets. $300K at Fidelity and $400K at Schwab? Consolidating puts you in the $500K–$1M tier instead of two sub-$500K accounts.

Ask for a rate match. Get a written quote from Interactive Brokers and bring it to your primary broker. Full-service firms routinely match to retain relationships.

Offer additional business. Moving your cash management or advisory relationship to the same firm can reduce your spread by 0.25% to 0.50%.

Time your request. Approach in the final month of a quarter — March, June, September, December — when lending desks are pushing to hit numbers.

What Happens When Rates Change

Because most SBLOCs are variable-rate, your cost adjusts automatically as SOFR moves. A 0.25% Fed rate cut translates to roughly a 0.25% drop in your SBLOC rate within one reset period.

Monitor your rate monthly. Most lenders will not proactively notify you of changes. If all-in rates cross above 8%, revisit your borrowing strategy — including a competing firm's SBLOC.