What Is the Legal Definition of an Undertaking in New York?

An undertaking in New York is a court-required financial guarantee that pays out if the person posting it fails to meet a specific obligation. Under CPLR 2501, it takes one of two forms: a surety’s written promise to pay a set dollar amount if a required condition goes unmet, or a cash deposit of that amount in U.S. legal tender or certain unregistered federal or state bonds.¹ The term runs through civil litigation, estate administration, guardianship, and criminal bail, and the dollar exposure is real: if the condition fails, the money is paid.

So an undertaking is not necessarily a surety bond. A cash or qualifying-bond deposit that meets the court’s conditions counts too. Every undertaking must be acknowledged in the same form required for a recorded deed. Where the court order or statute does not spell out a specific condition, the default condition is that the principal will faithfully discharge whatever duties the law or the court imposes.² All parties can also agree in writing to waive the undertaking entirely, unless the court directs otherwise.³

When New York Courts Require an Undertaking

Five situations account for most undertakings you will encounter.

Preliminary Injunctions

A plaintiff who wants a preliminary injunction must post an undertaking in an amount the judge sets. If the court later decides the injunction should not have been granted, the undertaking lets the defendant recover damages and costs caused by being wrongfully restrained.⁴ The state, a municipality, or a public officer acting in an official capacity can obtain an injunction without one under CPLR 2512.

Appeals from a Money Judgment

Filing a notice of appeal does not automatically stop the winner from collecting. Under CPLR 5519, enforcement of a judgment is stayed only if the appellant posts an undertaking. For a money judgment, the undertaking must equal the full amount. For a judgment directing delivery of personal property, the court fixes an amount covering the obligation to obey the appellate court. For real property, the undertaking must cover the value of use and occupancy during the appeal and commit the appellant to avoiding waste.⁵ A party that lost a $2 million judgment needs a $2 million undertaking to halt collection while the appeal runs.

Seizing Personal Property Before Trial

A plaintiff who wants to seize specific personal property before trial must, under CPLR 7102, post an undertaking worth at least twice the value of the property. It guarantees two things: the plaintiff will return the property to whoever wins at trial, and the plaintiff will pay any damages the judgment awards against them.⁶ The court grants the seizure order only after finding the plaintiff will probably succeed on the merits.

Executors, Administrators, and Guardians

Fiduciaries post bonds to protect the people whose money they handle. Under the Surrogate’s Court Procedure Act, the amount is based on the value of personal property the fiduciary will handle, estimated gross rents from real property for eighteen months, and any probable recovery from lawsuits the fiduciary will prosecute for the estate. The condition is that the fiduciary will faithfully discharge the trust, obey court orders, and render a verified account when required.⁷

An administrator’s bond can be reduced or dispensed with when all interested persons file acknowledged consents. If only some consent, those consenting must specifically release any claim under the bond, and the court sets an amount sufficient to protect creditors and the non-consenting parties.⁸ Because premiums come out of the estate, beneficiaries who trust the administrator often have a financial reason to consent to a waiver.

For an Article 81 guardian of an incapacitated person, the court has discretion to require or dispense with a bond. If the estate is large, the court can direct that some assets be deposited with a county treasurer, bank, or trust company and set the bond based only on what the guardian actually controls. Community guardian programs can file a single consolidated undertaking of up to $1.5 million covering all the people they serve rather than posting individual bonds.⁹

Criminal Bail

Criminal practice uses different terminology but the mechanics overlap. CPL 520.10 lists nine authorized forms of bail, including cash, insurance company bail bonds, secured and unsecured surety bonds, appearance bonds, and credit card payments. When bail is set, the court must allow it in at least three forms, and one option must be either an unsecured or partially secured surety bond.¹⁰ An insurance company bail bond works much like a civil undertaking: the surety promises the court the defendant will appear, and bears the loss if the defendant does not.

Who Can Serve as Surety

CPLR 2502 limits the role to two categories. The first is an insurance company authorized to do business in New York; the Insurance Law confirms that any insurer chartered and authorized in the state to execute bonds can serve as surety on any legally required undertaking.¹¹ The second is a natural person (but not an attorney) who lives in New York and whose net worth, after subtracting liabilities and property exempt from judgment collection, is at least equal to the undertaking amount.² In most cases, courts and opposing parties prefer a corporate surety.

When a natural person serves as surety on an undertaking exceeding $1,000, CPLR 2503 adds another requirement: the surety must back the promise with New York real property worth at least the undertaking amount, free of liens and encumbrances. The affidavit must describe the property, list any outstanding liens and unpaid taxes, and state both the assessed and market values. Recording the undertaking in the county clerk’s office creates a lien on that property.¹² When two or more people sign as sureties on the same undertaking, they are jointly and severally liable, which means the party protected can pursue any one of them for the full amount.¹³

What an Undertaking Costs

Cost depends on form. A cash deposit ties up the full amount for the duration of the case, which can mean months or years of lost liquidity. A surety bond from an insurance company costs a fraction of the face amount, paid as an annual premium. For judicial and appellate bonds, premiums typically run roughly 1% to 3% of the bond amount for financially strong principals, climbing higher for weaker credit or more complex risk. Fiduciary bonds for estate administration tend to carry lower premiums because the surety can evaluate the estate’s assets directly.

When the bond relates to a trade or business, the premium is an ordinary business expense and deductible for tax purposes, treated the same as other insurance costs. A sole proprietor would deduct it on Schedule C under insurance expenses. A premium covering more than one year must be spread across the covered period rather than claimed all at once.

What Happens If the Undertaking Is Not Honored

Courts treat an undertaking as a binding promise backed by real money. If a plaintiff posted one to get a preliminary injunction and the court later decides the injunction was unwarranted, the defendant can recover damages and costs caused by the restraint, including lost revenue and legal fees.⁴ The surety is liable up to the undertaking amount, and if multiple sureties signed, the claimant can go after any one of them for the full sum.¹³

When the undertaking is tied to a court order to deposit funds, return property, or perform an act, ignoring that order can lead to contempt proceedings under Judiciary Law 753, which authorizes fines and jail time for willful disobedience.¹⁴ A fiduciary who mismanages assets after posting a bond faces removal and personal liability for the losses; the bond exists to compensate the beneficiaries.

In criminal bail, if a defendant fails to appear without a sufficient excuse, CPL 540.10 requires the court to record the fact and immediately forfeit the bail bond or cash bail. The district attorney files the forfeiture order with the county clerk, who dockets it as a judgment against the surety for the full penalty. That judgment becomes a lien on the surety’s real property and is enforced like any other money judgment.¹⁵ Surety companies build this exposure into underwriting, which is why they commonly require collateral from the defendant or the defendant’s family.

Changing or Releasing an Undertaking

An undertaking does not have to stay fixed once posted. The court can increase or decrease the amount on its own initiative or on any party’s motion under CPLR 2508. For a preliminary injunction, CPLR 6314 lets the defendant move to vacate or modify at any time on notice to the plaintiff, and the defendant can offer their own undertaking as part of the modification. If the injunction is vacated, the undertaking dissolves with it, though liability for damages already caused survives.¹⁶

Fiduciary bonds can be reduced or waived by the acknowledged consent of all interested persons, or reduced to protect only non-consenting parties and creditors when some but not all consent.⁸ For an Article 81 guardianship, the court can revisit the bond if circumstances change, restrict the guardian’s authority over certain assets instead of enlarging the bond, or require assets to be held with a bank or trust company so institutional custody replaces much of the bond’s protective function.⁹

When a natural person served as surety and the undertaking created a lien on their real property under CPLR 2503, the lien is released one of two ways: the person protected files an acknowledged consent, or the court issues an order discharging the surety on motion with whatever notice the court directs. The county clerk then enters the release, and the lien disappears for all purposes.¹²

1
New York State Senate. New York Civil Practice Law and Rules CVP 2501 – Undertaking Definition
2
New York State Senate. New York Civil Practice Law and Rules CVP 2502 – Surety Form of Affidavit Two or More Undertakings Condition Acknowledgment
3
New York State Senate. New York Civil Practice Law and Rules CVP 2504 – Waiver of Undertaking Removal and Change of Parties
4
New York State Senate. New York Code CPLR 6312 – Motion Papers Undertaking Issues of Fact
5
New York State Senate. New York Civil Practice Law and Rules CVP 5519 – Stay of Enforcement
6
New York State Senate. New York Civil Practice Law and Rules CVP 7102 – Seizure of Chattel on Behalf of Plaintiff
7
FindLaw. New York Code SCP 801 – Amount Condition Number of Sureties Obligees
8
FindLaw. New York Code SCP 805 – Bond of Administrator Temporary Administrator or Administrator CTA
9
New York State Senate. New York Mental Hygiene Law 81.25 – Filing of Bond by Guardian
10
New York State Senate. New York Criminal Procedure Law CPL 520.10 – Bail and Bail Bond Forms
11
New York State Senate. New York Insurance Law 1111 – Compulsory Insurance Bonds of Surety Companies Certificates of Qualification
12
New York State Senate. New York Civil Practice Law and Rules CVP 2503 – Undertaking of More Than One Thousand Dollars Real Property Lien
13
New York Public Law. New York Civil Practice Law and Rules 2511 – Liability of Surety
14
New York State Senate. New York Judiciary Law 753 – Power of Courts to Punish for Civil Contempts
15
New York State Senate. New York Code CPL 540.10 – Forfeiture of Bail Generally
16
New York State Senate. New York Civil Practice Law and Rules Article 63 – Injunction