The quick read: If the permanent rate was not locked or committed before construction closed, the permanent loan is sized at the rate in force on conversion day, and a higher rate buys a smaller loan from the same net operating income. The U.S. Treasury's daily par yield curve shows the 10-year at 4.70% on August 3, 2026 and 5.31% on October 5, 2026, a rise of 61 basis points in nine weeks; it read 5.13% on October 21, 2026. In our illustration below, a 61 basis-point rise in the permanent coupon cuts proceeds on a building with $1.7 million of stabilized net operating income by about $1.18 million, and turns a $0.40 million cushion over an $18.5 million construction balance into a $0.77 million shortfall (our arithmetic). That shortfall is cash the sponsor brings at conversion unless the take-out was protected in advance.
Does a construction-to-permanent loan fix the permanent rate at closing?
A construction-to-permanent structure fixes the permanent rate at closing only when the documents include a rate lock or a forward commitment that sets the coupon in advance. Otherwise the take-out is priced when it funds, so the market on conversion day sets both the rate and the loan amount that rate will support.
The Office of the Comptroller of the Currency (OCC) describes the two kinds of take-out commitment in its Comptroller's Handbook on commercial real estate lending (Version 2.0, March 2022). A standby commitment provides back-up financing in case the borrower cannot obtain permanent financing, and the OCC says its fee structure and interest rate are often intended to dissuade the borrower from using it. A forward commitment is a commitment to refinance the construction loan upon completion and, almost always, lease-up. The OCC says forward commitments usually give the borrower the ability to lock in a fixed rate in advance of funding, and that they are in greater demand among borrowers in periods of rising interest rates.
Read your conversion clause for three things:
- Whether the permanent coupon is fixed now, set as a spread over an index, or left to be quoted at conversion
- The coverage, loan-to-value and occupancy tests the building must pass before the permanent loan funds
- Whether a failed test reduces the permanent amount or cancels the conversion
If the coupon floats until conversion, the Treasury tape is your exposure. These are the par yields the Treasury publishes on its daily par yield curve page:
10-year Treasury, August 3, 2026 (U.S. Treasury): 4.70%
10-year Treasury, October 5, 2026 (U.S. Treasury): 5.31%
10-year Treasury, October 21, 2026 (U.S. Treasury): 5.13%
Change, August 3 to October 5 (our arithmetic): 61 basis points
How does a higher rate shrink the permanent loan at the coverage test?
A higher rate shrinks the permanent loan because the take-out lender caps annual debt service at net operating income divided by its minimum coverage ratio, and every increase in the coupon raises the loan constant, so the same income supports fewer dollars of principal even though nothing about the finished building has changed.
Freddie Mac's multifamily fixed-rate term sheet (dated 4/26) shows the kind of tests a permanent lender applies:
Minimum amortizing DCR (Freddie Mac fixed-rate term sheet, 4/26): 1.25x
Maximum LTV, terms of 7 years or longer (Freddie Mac, 4/26): 80%
Maximum amortization (Freddie Mac, 4/26): 30 years
Minimum loan amount (Freddie Mac, 4/26): $10 million
The sheet notes that the coverage ratio for interest-only periods is calculated with an amortizing payment, so choosing interest-only does not escape the math. Whichever test produces the smaller loan sets the amount.
Our illustration: a building that stabilizes at $1.7 million of net operating income, an $18.5 million construction balance to retire, a 1.25x coverage test and 30-year amortization. The sponsor underwrote the take-out at a 6.00% coupon. The 6.61% row adds the 61 basis-point rise in the 10-year to that coupon, assuming the lender's spread does not change. These are assumed coupons, not quotes.
| Conversion rate | Loan constant | Perm proceeds at 1.25x | Gap vs $18.5M construction balance |
|---|---|---|---|
| Conversion rate 6.00% (as underwritten) | Loan constant 7.19% | Perm proceeds at 1.25x $18.90 million | Gap vs $18.5M construction balance $0.40 million cushion |
| Conversion rate 6.25% | Loan constant 7.39% | Perm proceeds at 1.25x $18.41 million | Gap vs $18.5M construction balance $0.09 million short |
| Conversion rate 6.61% (61 bp higher) | Loan constant 7.67% | Perm proceeds at 1.25x $17.73 million | Gap vs $18.5M construction balance $0.77 million short |
| Conversion rate 7.00% | Loan constant 7.98% | Perm proceeds at 1.25x $17.03 million | Gap vs $18.5M construction balance $1.47 million short |
Every figure in the table is our arithmetic on illustrative inputs. Maximum annual debt service is $1.36 million ($1.7 million divided by 1.25), and the permanent loan is that payment divided by the loan constant. A 61 basis-point move costs about $1.18 million of proceeds, roughly 6.2%. The permanent loan shrinks; the construction balance does not. The difference has to come from sponsor equity, a subordinate piece, or a paydown negotiated with the construction lender.
The value test can tighten in the same months. The OCC notes that rising interest rates may lead to higher capitalization rates and lower property values without any change to the property's fundamentals, so the loan-to-value ceiling can fall while the coverage test bites.
What protections exist against a rate rise before conversion?
The protections against a rate rise before conversion are a forward commitment that fixes the take-out coupon early, a rate or index lock bought close to funding, a facility that converts to a bridge or mini-perm period with extension options, and an interest reserve sized for higher rates. Each covers a different window and carries its own conditions.
| Protection | What it fixes | When it helps | Main limit |
|---|---|---|---|
| Protection Forward commitment | What it fixes The permanent coupon, before funding (OCC) | When it helps Long builds while rates are rising | Main limit Funds only after completion and, in most cases, lease-up tests (OCC) |
| Protection Standby commitment | What it fixes A back-up take-out (OCC) | When it helps Meeting a construction lender's committed take-out condition | Main limit Fees and rate often set to discourage use (OCC) |
| Protection Early rate lock | What it fixes The full coupon for a set period | When it helps Typically the last 60 to 120 days before purchase (Freddie Mac fixed-rate sheet) | Main limit Far shorter than a construction period |
| Protection Index lock | What it fixes The Treasury index only (Freddie Mac) | When it helps Locking the most volatile part of the coupon first | Main limit The spread can still move |
| Protection Bridge or mini-perm period with extensions | What it fixes Time, not rate | When it helps Waiting out a spike while lease-up finishes | Main limit Floating-rate cost while you wait |
| Protection Interest rate derivatives | What it fixes Part of the floating cost | When it helps Rarely a clean fit for construction draws | Main limit Mitigation is difficult and less effective (OCC) |
Forward commitment. The OCC says forward commitments allow a permanent lender, frequently a life insurance company, to originate the loan earlier in the development process. It also cautions that they require completion of construction and, in most cases, performance criteria such as lease-up to break even or better with leases at minimum rental rates. A locked coupon is worth nothing if the building misses the funding conditions, so negotiate those conditions as hard as the rate. Get the commitment's cost and refund terms in writing; we do not quote a typical fee because we could not verify one at a primary source.
Rate and index locks. Freddie Mac's fixed-rate term sheet describes an early rate-lock option that typically runs 60 to 120 days until Freddie Mac purchases the loan, and an Index Lock that lets the borrower lock the Treasury index, which the sheet calls the most volatile part of the coupon. Both protect the final stretch of a deal, not an 18-month build.
Bridge or mini-perm conversion with extensions. The OCC describes construction financing that covers the expected construction period and then converts to bridge financing for the expected stabilization period, and says extension options should be consistent with the expected construction time plus the projected absorption period. That buys time to place the permanent loan when the building is fully leased or rates have eased, at a floating-rate cost in the meantime.
Hedging. The OCC says borrowers can hedge interest rate risk with derivatives, but that mitigation is difficult and less effective for construction facilities because the outstanding balance changes during development and the loans have relatively short tenors.
How do you build rate risk into the construction budget and interest reserve?
You build rate risk into the construction budget by sizing both the interest reserve and the permanent take-out at a stressed rate rather than the rate on closing day, because the OCC lists rate changes as a key consideration in sizing a reserve and says banks generally require the borrower or guarantor to add cash when it runs dry.
The OCC handbook lists potential changes in interest rates among the key considerations in sizing an interest reserve. It says an appropriate reserve provides sufficient funds to pay interest through the project's anticipated completion and lease-up, sale or occupancy. When the budgeted reserve is depleted before completion, the bank generally requires the borrower or guarantor to provide additional cash, and the OCC calls a decision to repack the reserve with new debt a red flag indicating possible credit deterioration. A reserve sized at today's floating rate leaves nothing for the conversion gap in the table above, so run both numbers. Our guide on stress-testing a construction interest reserve covers the reserve side in detail.
Three checks before you close the construction loan:
- Size the take-out at a coupon at least 50 basis points above today's indication and confirm the equity plan covers the resulting gap (our planning rule of thumb; each lender sets its own sizing rules)
- Carry a separate line in the sources and uses for a smaller permanent loan, apart from the hard-cost contingency
- Track tenant improvement and leasing costs on their own schedule, because a building can convert on time and still come up short when those costs land late, which our article on funding tenant improvements before a take-out works through
The OCC's broader underwriting guidance points the same way: it says interest rates, capitalization rates and coverage ratios should be stress-tested to determine whether a property will remain viable during a period of economic stress. Our construction loan page sets out how the build and take-out phases fit together.
How do you get a construction take-out placed before rates move again?
You get a construction take-out placed before rates move again by pricing the permanent loan while the building is still going up, with one stabilized budget in front of several permanent lender types, so a forward commitment, an early lock at conversion and a bridge-to-permanent path can be compared on coupon, proceeds and funding conditions together.
The brokerage route comes first because it produces that comparison from one submission, and because the funding conditions in a forward commitment are negotiated, not read off a rate sheet. YieldStack is an AI-native commercial mortgage brokerage that arranges financing for commercial real estate investors. Its software matches the deal against 20,000+ loan programs, and human brokers then structure the request, negotiate for the borrower and carry the deal toward closing. The median first offer arrives in under an hour, from an institutional lender. Every credit decision is made by the lender; YieldStack arranges the introductions and negotiates on the borrower's side, and no loan, rate, or closing is guaranteed.
How the routes compare for a sponsor whose take-out is still unpriced:
- Brokerage route (YieldStack), our first pick as the publisher of this guide: one stabilized package priced for a forward commitment, a lock at conversion and a bridge-to-permanent path, with proceeds shown at today's coupon and a stressed coupon side by side. It costs Zero upfront to submit a deal and review offers; YieldStack's broker fee is 0.50–1.00% of the loan amount and is paid only at closing.
- Life insurance companies and other forward-commitment lenders: a fixed coupon set before funding, subject to completion and lease-up conditions.
- Agency multifamily programs: early rate locks and index locks close to funding, for eligible stabilized multifamily.
- Banks, including your construction lender: a conversion or mini-perm on terms set lender by lender.
What to send so the quotes are comparable:
- Construction budget, draw schedule and current balance, with the interest reserve remaining
- Projected stabilized rent roll and operating budget, plus every signed lease to date
- Completion and lease-up schedule, and the construction loan's maturity and extension dates
- The conversion clause or any existing take-out commitment
- The target permanent amount and the smallest amount your equity plan can absorb
When the package is ready, send the deal for review and ask for every quote at both today's coupon and a coupon 50 basis points higher.
The bottom line
Unless you fix it earlier, the permanent loan is sized at the rate on the day it funds. The 10-year rose from 4.70% on August 3 to 5.31% on October 5, 2026, and in our illustration a 61 basis-point move turns a $0.40 million cushion into a $0.77 million equity call. Price the take-out before completion, size it at a stressed coupon, and pick the protection that matches the time left on the build.