Commercial mortgage delinquency is stuck near eight percent

Commercial mortgage credit has stopped improving. Trepp put the CMBS delinquency rate at 7.85 percent in August 2026, down a single basis point from July, in the monthly delinquency report it published in September. One basis point is not a recovery. It is a rate that has parked itself near eight percent and stayed there, with office loans still the heaviest drag.

If you buy single-family houses, you may read that and move on. Do not. The CMBS number is the cleanest public read on what banks and debt funds are seeing in their commercial books, and that is the same balance sheet that decides whether your five-unit, your mixed-use corner building, or your small apartment refinance gets quoted at all.

What the number actually measures

CMBS stands for commercial mortgage-backed securities. These are pools of commercial loans sold to bond investors, and because the pools report monthly, the delinquency rate is visible to anyone in a way that bank portfolio performance is not. Trepp tracks it and publishes on a monthly schedule. At 7.85 percent in August 2026, roughly one dollar in thirteen of tracked commercial loan balance was behind on payments.

Office is the concentration of the damage and has been for three years. But the headline rate is what loan committees look at, and the headline rate is not falling. A one-basis-point move after years of elevated readings tells you the problem has been absorbed, not solved. Credit officers price for a world where commercial collateral defaults at eight percent, because for two years running it has.

Why an office problem shows up in your small multifamily deal

Lenders do not underwrite your deal in isolation. They underwrite it against their existing exposure. A regional bank carrying three distressed office notes has less appetite for new commercial real estate paper of any kind, including a clean twelve-unit in a market nowhere near a downtown tower. The credit box tightens at the institution level, not the asset level.

You will feel this in four places:

• The unit-count cliff. One to four units gets residential treatment. Five and up gets commercial treatment, and commercial treatment is where the tightening lives. A duplex and a six-unit are not the same financing product even when they sit on the same street.
• Debt service coverage minimums. Coverage requirements on commercial-sized deals drift up when the portfolio behind them is stressed. A deal that pencils at 1.20 may need to pencil at 1.30.
• Leverage. Proceeds get cut before rates get raised. Expect the gap to show up as a larger cash requirement, not a scarier coupon.
• Timeline. Committee review on commercial-sized collateral takes longer in a defensive credit environment. Build the extra weeks into your contract, not into your hope.

The refinance takeout is the real exposure

Most investors who get hurt in a tight commercial credit market do not get hurt at purchase. They get hurt at the exit. You buy a tired eight-unit with short-term money, you spend six months turning units and raising rents, and then you need permanent financing to pay off the bridge. That permanent loan is a commercial loan, and it is being written by the same institutions staring at a delinquency rate near eight percent.

Underwrite the takeout before you underwrite the renovation. Get a written indication from a permanent lender on what they will do with your stabilized numbers, at today's coverage requirements, before you sign a purchase contract. If you cannot find a permanent quote for the stabilized asset now, you are betting that credit loosens on your timeline. Nothing in the August data supports that bet.

Residential credit is behaving differently

The contrast matters. The Mortgage Bankers Association reported that residential mortgage delinquencies decreased slightly in the second quarter of 2026, in its National Delinquency Survey released on August 13, 2026. Homeowners are paying. Commercial borrowers are the ones stuck.

For underwriting, that split is the whole point. One-to-four-unit residential strategies are running on a credit channel that is currently performing. Five-plus strategies are running on one that is not. If you have been moving up in unit count because the per-door economics look better, price in the fact that the financing underneath that move is the weaker of the two channels right now.

What to change this month

1. Re-run every five-plus deal at a higher coverage ratio. If the deal only works at the minimum, it does not work.
2. Assume lower proceeds on the permanent loan. Model the refinance at ten percentage points less leverage than you were assuming in the spring and see what it does to your cash-on-cash.
3. Extend your bridge timeline assumptions. If your short-term money matures in twelve months and your takeout needs committee approval in a cautious market, twelve months is tight. Negotiate extension options at the start, when you have leverage, not at month ten.
4. Look at the other side of the trade. Owners facing 2026 and 2027 maturities on commercial-sized assets are the motivated sellers of this cycle. A seller with a balloon coming due and no refinance in hand will take a number that a seller with a fixed-rate loan through 2030 will laugh at. Find the maturities.
5. Stay disciplined on the one-to-four line. If your market's small multifamily does not clear at the new coverage requirements, the same capital may clear better in single-family rentals or a flip, where the credit channel is not fighting an eight percent delinquency rate.

What to watch

Trepp publishes the delinquency rate monthly, so the next reading arrives on a predictable schedule. Watch whether the rate breaks below 7.5 percent or pushes above eight. A move down means loan committees start breathing and proceeds come back. A move up means another round of tightening on exactly the deals most small investors are trying to buy. Either way, the number moves before the quotes do, which is why it is worth tracking even if you never touch a CMBS loan in your life.

Figures come from Trepp's monthly CMBS delinquency report for August 2026, published in September, and the Mortgage Bankers Association's National Delinquency Survey released August 13, 2026.