✓ Verified September 2026
To contest a will in Delaware, you file in the probate court within a fixed window and prove one of a short list of legal grounds. This guide gives the Delaware answer in plain English, and it starts with the deadline, because that is the fact that ends more cases than any other. All facts are from Delaware law, verified as of September 2026.
In This Delaware Guide:
Contest a Will in Delaware: At a Glance
Here are the Delaware facts that decide whether you can contest a will in Delaware:
| Deadline to contest | 6 months after the entry of the order of probate to petition the Court of Chancery for review of the proof of the will — 12 Del. C. § 1309. Before that order is entered, an interested person may instead file a caveat against allowance of the instrument as a will at any time prior to entry of the order of probate — 12 Del. C. § 1308. Separate track: if the will was validated during the testator’s lifetime under Delaware’s pre-mortem will validation statute, a person who received written notice has 120 days following receipt of that notice to file a contest proceeding in the Court of Chancery, and after that period expires the will cannot be challenged post-death by anyone duly notified — 12 Del. C. § 1311 |
| What starts the clock | Entry of the order of probate (admission of the will to probate by the Register of Wills, acting as clerk of the Court of Chancery) starts the 6-month § 1309 review clock. The § 1309 right of review runs in favor of an interested person who did not voluntarily appear at the taking of the proof of the will and was not served with citation or notice. For a caveat under § 1308, the cutoff event is entry of the order of probate itself. Under § 1311 the clock is receipt of the pre-mortem written notice, not death. |
| Who can contest | Any “person interested” — the phrase used in 12 Del. C. § 1308 (“parties interested”) and § 1309 (“any person interested”). In practice this means those with a direct pecuniary stake in the outcome: beneficiaries named in the challenged will, beneficiaries under a prior will, and heirs who would take under Delaware’s intestacy statute (12 Del. C. ch. 5) if the will were set aside. Under the pre-mortem validation statute, § 1311 identifies those to be notified as beneficiaries named in the will, persons who would inherit by intestacy if the testator died intestate, and any other person the testator wishes to be bound as to the will’s validity. General creditors of the estate are not the intended class; a creditor’s remedy runs through the claims process rather than a will contest. Whether a particular person qualifies is decided case by case — check with the Register of Wills in the county of probate or a licensed Delaware attorney. |
| No-contest clause | YES — enforced, and Delaware is notably stricter than most states because it does NOT recognize a probable-cause or good-faith exception. 12 Del. C. § 3329(a) provides that a provision of a will or trust that would reduce or eliminate the interest of a beneficiary who initiates or participates in an action contesting validity or seeking to set aside or vary its terms “shall be enforceable.” The narrow carve-outs in § 3329(b) include: an action brought by a trustee or personal representative; an action in which the beneficiary is determined by the court to have “prevailed substantially”; an agreement among beneficiaries settling a dispute; an action to determine whether a proposed proceeding would constitute a contest (a safe-harbor declaratory action); and an action for construction or interpretation of the instrument. |
| What the filing is called | Two filings depending on timing. Before the order of probate: a “caveat against the allowance of the instrument as a will,” filed with the Register of Wills / Court of Chancery in the county of probate (12 Del. C. § 1308). After the order of probate: a “petition for review of proof of will” (petition for review of probate) filed in the Court of Chancery, which then proceeds “as upon a caveat” (12 Del. C. § 1309). A pre-mortem challenge under § 1311 is a proceeding filed in the Court of Chancery following procedures comparable to a § 1308 caveat. |
| Court | Delaware Court of Chancery. The Register of Wills in each county (New Castle, Kent, Sussex) is the probate office and acts as Clerk of the Court of Chancery for probate matters (12 Del. C. ch. 25); contested will matters are heard by the Court of Chancery, often before a Magistrate in Chancery in the first instance, with exceptions taken to a Vice Chancellor or the Chancellor and appeal to the Delaware Supreme Court. |
| Jury trial | NO as of right. A will contest in the Court of Chancery is an equitable proceeding and there is no right to trial by jury in equity; filing in Chancery is treated as a waiver of jury trial. The court has discretionary statutory authority under 10 Del. C. § 369 to order that matters of fact proper to be tried by a jury be tried by issues at the Bar of the Superior Court, but that is the court’s discretion, not the contestant’s right. |
| Typical cost | UNVERIFIED — Delaware publishes no official cost range for contested will litigation. Register of Wills and Court of Chancery filing fees are set by statute and court schedule and are modest relative to attorney’s fees; the Court of Chancery may under 12 Del. C. §§ 1308 and 1309 determine the costs occasioned by a caveat or review and decree who pays them. Ask a licensed Delaware attorney for an estimate on a specific matter. |
The Deadline to Contest a Will in Delaware
The window is short in some states and long in others, and it is measured from a specific event rather than from the day you learned about the will. That is why the first thing to find out is the date the will was admitted and whether you received formal notice. If the deadline has not run, everything else on this page is available to you.
If it has, the remaining options are narrow and usually involve proving you never got the notice the law required.
Grounds to Contest a Will in Delaware
Lack of testamentary capacity (testator must understand the nature and extent of the estate, know the natural objects of bounty, and be able to connect the two to decide the disposition); undue influence; fraud; duress; improper execution / failure to meet the statutory formalities of 12 Del. C. § 202; forgery; and revocation of the will (12 Del. C. § 208).
Delaware undue-influence elements, per In re Last Will and Testament of Melson, 711 A.2d 783 (Del. 1998): (1) a susceptible testator, (2) opportunity to exert influence, (3) a disposition to do so for an improper purpose, (4) actual exertion of influence, and (5) a result showing its effect.
Who has to prove what: The contestant carries the initial burden. Delaware starts from a presumption that the testator had testamentary capacity when the will was executed, and the party attacking capacity bears the burden of proving legal incapacity. On undue influence the contestant likewise bears the burden, by a preponderance of the evidence. Burden shift (In re Will of Melson, 711 A.2d 783 (Del.
1998)): if the challenger establishes by clear and convincing evidence that (a) the testator was of weakened intellect, (b) the will was drafted by a person in a confidential relationship with the testator, and (c) that drafter received a substantial benefit under the will, then the presumption of capacity does not apply and the burden shifts to the will’s proponent to prove, by a preponderance of the evidence,
both testamentary capacity and the absence of undue influence.
Fraud and forgery claims are generally held to a clear-and-convincing standard.
Who Can Contest a Will in Delaware
Any “person interested” — the phrase used in 12 Del. C. § 1308 (“parties interested”) and § 1309 (“any person interested”). In practice this means those with a direct pecuniary stake in the outcome: beneficiaries named in the challenged will, beneficiaries under a prior will, and heirs who would take under Delaware’s intestacy statute (12 Del. C. ch. 5) if the will were set aside.
Under the pre-mortem validation statute, § 1311 identifies those to be notified as beneficiaries named in the will, persons who would inherit by intestacy if the testator died intestate, and any other person the testator wishes to be bound as to the will’s validity. General creditors of the estate are not the intended class; a creditor’s remedy runs through the claims process rather than a will contest.
Whether a particular person qualifies is decided case by case — check with the Register of Wills in the county of probate or a licensed Delaware attorney. Being unhappy with the will is not standing; losing something because of it is. Check the earlier will and the intestate rules for Delaware before filing, because they decide whether you are an interested person.
No-Contest Clauses in Delaware
YES — enforced, and Delaware is notably stricter than most states because it does NOT recognize a probable-cause or good-faith exception. 12 Del.
C. § 3329(a) provides that a provision of a will or trust that would reduce or eliminate the interest of a beneficiary who initiates or participates in an action contesting validity or seeking to set aside or vary its terms “shall be enforceable.” The narrow carve-outs in § 3329(b) include: an action brought by a trustee or personal representative;
an action in which the beneficiary is determined by the court to have “prevailed substantially”; an agreement among beneficiaries settling a dispute; an action to determine whether a proposed proceeding would constitute a contest (a safe-harbor declaratory action); and an action for construction or interpretation of the instrument.
The Steps to Contest a Will in Delaware
Step one is the deadline check above. Step two is evidence: the medical records around the signing date, the names of the witnesses, the drafting lawyer’s file, and the financial records that show who benefited. Step three is the filing — Two filings depending on timing.
Before the order of probate: a “caveat against the allowance of the instrument as a will,” filed with the Register of Wills / Court of Chancery in the county of probate (12 Del. C. § 1308). After the order of probate: a “petition for review of proof of will” (petition for review of probate) filed in the Court of Chancery, which then proceeds “as upon a caveat” (12 Del.
C. § 1309). A pre-mortem challenge under § 1311 is a proceeding filed in the Court of Chancery following procedures comparable to a § 1308 caveat.. Step four is discovery and, in most cases, a settlement conference; the small minority that reach trial are decided by the judge.
Settling Instead of Fighting
YES. Court of Chancery Rule 174.1 provides for mandatory mediation in probate disputes (and adult guardianship matters), and the court operates mediation programs under Rule 174. Delaware also authorizes nonjudicial settlement agreements among interested persons under 12 Del. C. § 3338, and 12 Del. C. § 3329(b) expressly protects a settlement agreement among beneficiaries from triggering a no-contest clause.
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Family settlement agreements resolving a contest are therefore available and are the route most Delaware estates take.
Other Delaware rules: (1) PRE-MORTEM (ANTE-MORTEM) WILL VALIDATION — 12 Del. C. § 1311.
Delaware is one of a small number of states allowing a living testator to have a will judicially validated before death by giving statutory written notice to beneficiaries and intestate heirs; anyone duly notified who does not file in the Court of Chancery within 120 days of receiving notice is permanently barred from challenging that will after death (on grounds including undue influence and mistake),
provided the 120 days expired before the testator died.
If the period had not run at death, § 1311’s bar does not apply. (2) NO PROBABLE-CAUSE EXCEPTION to no-contest clauses — 12 Del. C. § 3329; the only relief is “prevailing substantially,” a materially harder standard than the probable-cause rule used in most states, though § 3329(b) permits a safe-harbor action to ask the court whether a proposed proceeding would even count as a contest.
(3) THE REGISTER OF WILLS IS A BRANCH OF CHANCERY — probate is filed county-side with the Register of Wills, but the contest is a Court of Chancery equity proceeding; the Register may hear and determine matters requiring no statutory notice, subject to being set aside or modified by the Court within 30 days.
(4) TWO-STAGE DEADLINE STRUCTURE — a caveat before the order of probate versus a § 1309 petition for review within 6 months after it; the review right is written for interested persons who neither appeared nor were served, so a person who did appear or was noticed should not assume the 6-month window is available.
(5) SELF-PROVING / PROOF OF WILL — Delaware proves wills by affidavit of the subscribing witnesses under 12 Del. C. §§ 1303–1305, which supplies prima facie proof of due execution and shifts the practical burden to the contestant.
Deadlines are short and unforgiving here; anyone considering a contest should confirm the exact dates with the Register of Wills in the county of probate or a licensed Delaware attorney before relying on any of the above.
The Evidence That Wins or Loses a Will Contest
Capacity cases turn on the weeks around the signing: the medical chart, prescriptions, a dementia diagnosis, and what the drafting lawyer and the witnesses saw that day. A will signed in a lawyer’s office with two disinterested witnesses and a self-proving affidavit is hard to attack; a will signed at a kitchen table with the main beneficiary present is not.
Undue influence cases turn on the relationship — who drove the parent to the appointment, who chose the lawyer, who was in the room, and whether the new will departed sharply from earlier ones and from what the parent said to other people.
Improper execution is the narrowest ground and the cleanest: Delaware sets exact witness and signature rules, and a will that misses them fails regardless of what the signer intended. Before you contest a will in Delaware, gather the prior wills, the medical releases, and the names of everyone at the signing.
Most of that evidence has to be requested formally once the case is filed, and the deadline does not wait for it.
What to Expect When You Contest a Will in Delaware
A will contest is a lawsuit about the document, not about fairness. When you contest a will in Delaware, the court asks whether the person who signed it had capacity, signed it freely, and signed it correctly. It does not ask whether the split was reasonable. That is why the strongest cases rest on medical records and witness accounts from the weeks around the signing.
Most families who contest a will in Delaware settle. Courts encourage it, many states have family settlement rules that let the heirs agree to a different division, and a settlement avoids the cost and delay of trial. The deadline, the grounds, and the no-contest clause above are the three facts that set your bargaining position before any of that begins.
You don’t have to do this alone
If you are settling a loved one’s estate in Delaware, your state’s probate court self-help center and free legal-aid offices can walk you through the process at no cost. For an active probate or a deadline, talk to a licensed probate attorney in your state.
Key Takeaways: Contest a Will in Delaware
- The deadline is everything: the window to contest a will in Delaware closes on a fixed schedule, and the court cannot reopen it for a late but valid claim.
- Grounds are specific: you contest a will in Delaware on capacity, undue influence, fraud, duress, or bad execution, never on unfairness alone.
- Standing first: only an interested person can contest a will in Delaware; check whether you inherit under the prior will or the intestate rules.
- Read the no-contest clause: whether the state enforces it decides how much risk it takes to contest a will in Delaware.
- Evidence is medical and financial: records, witnesses to the signing, and the drafting lawyer’s file decide most cases when you contest a will in Delaware.
- Settlement is common: most families who contest a will in Delaware settle before trial, often through the state’s family settlement rules.
- Find the admission date: the day the will was admitted is the day the clock to contest a will in Delaware usually starts.
- Prior wills matter twice: they give you standing to contest a will in Delaware and show how far the last will departed from the pattern.
- Notice defects are a lifeline: if you never got the required notice, you may still contest a will in Delaware after the ordinary deadline.
- Self-proved wills are harder: a will with a notarized witness affidavit raises the bar to contest a will in Delaware on execution grounds.
- Cost scales with the estate: before you contest a will in Delaware, compare the likely fees to what you would actually gain.
- Mediation is usually offered: many courts require a settlement conference before anyone who chooses to contest a will in Delaware sees a judge.
You May Also Like
Official Delaware Sources & Resources
- Delaware Probate Court: https://courts.delaware.gov/chancery/
- Delaware Will Contest Statute: https://delcode.delaware.gov/title12/c013/index.html
- Internal Revenue Service — Estate Tax: irs.gov
- Cornell Legal Information Institute: law.cornell.edu/wex
This Delaware guide was last verified against official sources in September 2026. Laws change — verify with your state court or a licensed attorney.
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Disclaimer: This guide is informational only and is not legal or tax advice. Estate, probate, and tax laws change and vary by state and county. Verify current rules and dollar figures with your state’s court, statute, or a licensed attorney or tax professional before acting. For urgent matters like an active probate or a tax deadline, consult a licensed professional in your state right away.