What Is a Completion Guaranty and How Does It Work?

A completion guaranty is a third-party promise given to a construction lender that a project will be finished according to plan even if the borrower runs out of money or walks away. If the borrower defaults during construction, the guarantor must either take over and finish the building or write a check large enough to cover the remaining cost. The guarantor’s exposure is capped at the cost of finishing the project, not the full loan balance, which is what separates this instrument from a repayment guaranty.

Lenders require it because their collateral is a finished building. A half-built structure is worth a fraction of what was lent against it, so the loan is not really secure until construction is done. The completion guaranty closes that gap by putting a financially capable third party on the hook for delivery.

Who the Parties Are

Three parties sit at the table. The lender provides the construction loan and is the one protected. The borrower is the developer or project entity actually building the project. The guarantor is a financially strong party connected to the deal, typically the developer’s parent company, a lead investor, or a high-net-worth principal with real equity at stake.

Lenders vet the guarantor before accepting the guaranty. A common benchmark in multifamily and commercial lending requires the combined net worth of the borrower and key principals to equal or exceed the loan amount, with liquid assets covering at least nine months of debt service.¹ Requirements shift by lender and loan size, but the underlying idea is constant: the guarantor must actually be able to make good on the promise.

How It Differs From a Payment Guaranty

This distinction matters, and confusing the two can lead to badly mispriced risk. A payment guaranty is a promise to pay back the loan itself if the borrower defaults. The guarantor’s exposure runs to the full outstanding loan balance. A completion guaranty is narrower: the guarantor promises to finish the building or fund the remaining construction costs. Once the project is done and a certificate of occupancy is issued, the guarantor is off the hook, even if the finished property turns out to be worth less than the loan.

Lenders on large construction deals often require both, along with a separate non-recourse carve-out guaranty covering borrower misconduct. Treating any of them as interchangeable is expensive.

What the Guarantor Has to Do

When the borrower defaults, the lender can call on the guarantor to satisfy one of two obligations. The first is to step in, manage the construction through to completion, and pay all associated costs. The second is to write the lender a check equal to the projected cost of finishing.² Most agreements let the lender pick which remedy to pursue.

How the Cash Amount Is Calculated

When the lender opts for cash rather than requiring the guarantor to physically finish the project, the amount equals the estimated remaining construction costs minus any undisbursed loan funds and reserve accounts already set aside for construction.² If the project needs $3 million more to finish and $1.8 million in undisbursed loan proceeds and reserves remain, the guarantor’s bill is roughly $1.2 million.

Where the math gets contentious is reserves. Lenders sometimes have the right during a default to sweep construction reserves toward other loan obligations, which effectively inflates the guarantor’s obligation. Getting explicit credit for those reserves written into the guaranty is one of the more valuable negotiation points.

Cost Overruns and Budget Balancing

Construction loans are disbursed in draws as work progresses, and lenders track remaining budget against remaining costs. When costs outrun the budget, the loan is “out of balance,” and the lender issues a balancing call for more funds. The guarantor is on the hook for cost overruns that exceed the loan’s construction allocation.² That is the core economic risk. Construction never lands exactly on budget, and material or labor spikes can move exposure fast.

What Triggers It

A lender cannot call the guaranty on a whim. Specific defaults by the borrower under the construction loan agreement must occur first, followed by written notice to the guarantor demanding performance.³ Common triggers include:

Work stoppage for a sustained period without justification.
Unpaid contractors or suppliers, resulting in liens filed against the property. These liens threaten the lender’s priority position and can halt further work.
Missed construction milestones by their contractual deadlines.
Budget imbalance, where the borrower fails to deposit additional funds after a balancing call.

Once triggered, the lender can require the guarantor to complete the project, fund the remaining costs, or remove any liens.²

What “Completion” Actually Means

The agreement defines completion precisely, and the definition reaches well past the last nail. A typical completion guaranty requires the project to be built according to approved plans, free of any liens from unpaid contractors or suppliers, and in compliance with all applicable building codes and legal requirements.² A final certificate of occupancy is the usual benchmark. Some agreements go further and require the property to be open and operating under any applicable franchise or management agreement before the guaranty terminates.⁴

The gap between those two standards matters. A hotel with a certificate of occupancy but no furniture, no staff, and no franchise flag is technically habitable but generating nothing. The “open and operating” standard keeps the guarantor liable longer.

Coverage also usually extends to both hard costs (labor and materials) and soft costs such as architectural fees, engineering, insurance, and property taxes during construction.² Guarantors often push to limit their obligation to hard costs only, since soft costs and carrying costs like loan interest can climb unpredictably during delays.

Waiver of Defenses

This is the provision that makes completion guaranties so lender-friendly. The guarantor gives up most legal defenses the borrower might raise against the lender. If the borrower claims the lender breached the loan agreement or failed to disburse funds properly, the guarantor cannot use that dispute as a reason to refuse performance. The guarantor also waives notice requirements for borrower defaults and any duty the lender might otherwise have to disclose the borrower’s financial condition.³

The result is a guaranty treated as “absolute and unconditional.” The lender can demand performance without first resolving any dispute with the borrower. Guarantors who assume they can hide behind the borrower’s defenses tend to learn otherwise in litigation.

How Guarantors Limit Exposure

Exposure does not have to sit at its maximum for the life of the loan. Many agreements include “burn-off” or “burn-down” provisions that reduce or eliminate the guaranty as milestones are hit. Coverage starts at its peak when the loan closes and steps down as conditions are met, such as reaching a leasing target, pledging additional collateral, or passing a set period without a default. If all conditions are satisfied, the guaranty can terminate entirely before the loan matures.

Experienced guarantors also negotiate a liquidated damages cap replacing the open-ended obligation with a fixed dollar figure, credit for any unfunded loan proceeds, termination if the property is sold through foreclosure or receivership, and the benefit of any performance bond proceeds paid on the project.

The Non-Recourse Carve-Out Warning

Most commercial construction loans are structured as non-recourse. The lender can seize the property but cannot pursue personal assets if the project fails. The completion guaranty is one carved-out exception for construction risk. A separate set of provisions called “bad boy” carve-outs is another, and this one is bigger.

Carve-out triggers typically include fraud, voluntary bankruptcy filings, unauthorized property transfers, failure to maintain required insurance, and environmental violations. If any of these occur, the loan can convert from non-recourse to full recourse, exposing the guarantor to the entire outstanding debt rather than just completion costs. Anyone signing a completion guaranty should read the accompanying non-recourse carve-out agreement carefully. The two documents work in tandem, and the carve-outs are the larger financial risk.

When the Guaranty Ends

A completion guaranty terminates when the project is finished. Standard release conditions include a final certificate of occupancy, payment of all construction costs, and delivery of the property free of contractor liens. Some agreements add an operating requirement, keeping the guaranty alive until the property is open and generating revenue under any applicable franchise agreement.⁴

Once the guaranty terminates, the guarantor has no further liability for how the project performs or whether the loan gets repaid. If the finished building turns out to be worth less than the loan balance, that shortfall belongs to the lender. The guarantor’s promise was to deliver a completed building, not to guarantee its market value.

After a Guarantor Pays

Paying under a completion guaranty does not necessarily mean absorbing the loss for good. Subrogation gives the guarantor the right to step into the lender’s shoes and pursue the borrower for reimbursement. Most agreements require the guarantor to waive or subordinate those rights while the loan is outstanding, because the lender does not want the guarantor competing with it for the borrower’s limited assets. Once the loan is repaid or the property is sold, the guarantor can typically assert recovery rights, though collecting from a defaulted borrower is often difficult in practice.

Tax treatment turns on whether the guarantee relates to your trade or business. When a noncorporate guarantor pays on a guarantee of a noncorporate borrower’s debt, and the loan proceeds were used in the borrower’s trade or business, the payment is treated as a bad debt deduction under federal tax law, allowed in the year of payment if the borrower’s underlying obligation was essentially worthless at that time.⁵

When the guarantee involves a corporate borrower’s debt, the analysis shifts. The payment creates a debt owed to the guarantor by the corporation, and if that debt becomes worthless, it is generally treated as a nonbusiness bad debt, deductible only as a short-term capital loss subject to the annual capital loss limits. If the guarantee was closely connected to your own trade or business, the loss can qualify as a business bad debt deductible against ordinary income.⁶ The distinction between business and nonbusiness bad debts carries real tax consequences, and a guarantor facing a significant payment should get professional tax advice before claiming a deduction.

1
Fannie Mae. Borrower, Key Principals, Guarantors, and Principals
2
U.S. Securities and Exchange Commission. EDGAR – Completion Guaranty – NexPoint Strategic Opportunities Fund
3
U.S. Securities and Exchange Commission. Completion Guaranty Agreement
4
U.S. Securities and Exchange Commission. Construction Completion Guaranty
5
eCFR. 26 CFR 1.166-8 – Losses of Guarantors, Endorsers, and Indemnitors
6
Office of the Law Revision Counsel. 26 USC 166 – Bad Debts