Estate Planning UK 2026 — Wills, LPA, Probate and Inheritance Tax Guide

Contesting a Will UK — When and How to Challenge

Guide to contesting a will in the UK. Grounds for challenging, who can contest, the legal process, costs, and what to consider before taking action.

If you are planning wills, attorney roles, probate steps, and family handover tasks together, use the Estate Planning Hub for the full route map.

Contesting a will is serious and costly. Here’s when it’s possible and whether it’s worth it.

Who Can Contest a Will

People With Standing

CategoryCan Contest
Spouse/civil partnerYes
Former spouse (not remarried)Yes
ChildrenYes
Stepchildren (if dependent)Yes
Cohabitees (2+ years)Yes
Anyone being maintainedYes
Anyone named in willYes
Anyone in previous willYes

People Who Can’t Contest

CategoryStanding
FriendsNo (unless in will)
Business partnersNo (unless in will)
CharitiesOnly if named
Anyone elseNeed specific ground

Grounds for Contesting

Invalidity Grounds

GroundWhat It Means
Lack of mental capacityDidn’t understand what they were doing
Improper executionNot properly signed/witnessed
Undue influencePressured into making the will
Fraud/forgeryWill is fake or falsified
Lack of knowledgeDidn’t know/approve contents

Inadequate Provision (Inheritance Act 1975)

GroundClaim
Reasonable financial provisionNot made for dependant
Who can claimSpouse, children, cohabitees, dependants
Court decidesWhat’s reasonable in circumstances

What “Mental Capacity” Means

RequirementDeceased Must Have Understood
Nature of making a willWhat a will does
Extent of estateRoughly what they owned
Claims on estateWho might expect to benefit
Free of delusionNot affected by mental disorder

The Two Types of Claim

1. Will Invalidity

AimTo prove the will isn’t valid
Effect if successfulWill set aside; earlier will or intestacy applies
Standard of proofBalance of probabilities
BurdenUsually on person challenging
Time limitNone, but act quickly

2. Inheritance Act Claim

AimGet reasonable financial provision
Effect if successfulCourt orders provision for you
Not challenging willWill remains valid
Must showInadequate provision for your needs
Time limit6 months from probate

Before You Contest

Questions to Ask

QuestionConsider
Do I have standing?Legal right to contest
Do I have grounds?Valid legal basis
Is the estate worth it?Value vs costs
What evidence do I have?Can I prove my case?
What do I really want?Money? Recognition?
Family consequences?Relationships

Is It Worth It Financially?

Estate ValueContest CostWorth It?
£20,000£10,000+Probably not
£100,000£15,000+Maybe
£500,000+£30,000+More likely

Emotional Cost

FactorConsider
Family relationshipsOften irreparably damaged
StressLegal battles are draining
TimeMonths or years
UncertaintyOutcome not guaranteed
PublicSome details become known

The Process

Step 1: Initial Investigation

ActionPurpose
Get copy of willReview provisions
Review earlier willsSee changes
Gather evidenceMedical records, witnesses
Consult solicitorAssess strength of case

Step 2: Enter a Caveat

What It DoesStops probate being granted
Duration6 months, can be extended
Cost£3 at Probate Registry
PurposePrevents estate distribution
EffectBuys time to investigate

Step 3: Pre-Action Protocol

RequirementDetails
Letter before claimSets out your case
Try to settleNegotiation encouraged
Share evidenceProportionate disclosure
MediationOften required

Step 4: Court Proceedings

If No SettlementCourt
Issue claimStart formal proceedings
DisclosureShare documents
Witness statementsGive evidence
TrialIf still not settled
JudgmentCourt decides

Costs

StageCost Range
Initial advice£500-£1,500
Investigation£2,000-£5,000
Pre-action work£3,000-£10,000
If court proceedings£10,000-£50,000+
Full trial£50,000-£150,000+

Who Pays?

OutcomeCosts Rule
You winMay recover some costs
You loseMay pay other side’s costs
SettlementOften each pays own
Part successCosts apportioned

Cost Protection

OptionDetails
ATE insuranceAfter the event cover
CFA/No win no feeSome cases qualify
Legal aidRarely available
Fixed fee initial adviceAssess before committing

Evidence You’ll Need

For Mental Capacity Claim

EvidencePurpose
Medical recordsDiagnosis of conditions
GP notesAround time will made
Care home recordsIf applicable
Witness statementsBehavior at the time
Expert medical opinionRetrospective assessment

For Undue Influence

EvidencePurpose
Witness statementsWho was around
Previous willsPattern of changes
Dependency evidenceReliance on influencer
Isolation evidenceCut off from family
Financial controlWho managed money

For Inheritance Act

EvidencePurpose
Your financial needsIncome, capital
Deceased’s obligationsWhat they should have done
Estate valueWhat’s available
Your circumstancesWhy you need provision
Others’ claimsCompeting needs

Alternatives to Court

Negotiation

ApproachDetails
Direct discussionWith executors/beneficiaries
Solicitor negotiationsFormal correspondence
Early settlementOften best outcome
Deed of VariationBeneficiaries can agree changes

Mediation

FeatureDetails
Neutral mediatorHelps reach agreement
ConfidentialUnlike court
QuickerUsually one day
CheaperThan litigation
Success rateAbout 70% settle

Family Arrangement

MethodDetails
Deed of VariationBeneficiaries agree different distribution
All must agreeCan’t force
Tax neutralIf done within 2 years
FlexibleWhatever everyone agrees

Summary: Contesting Checklist

Before Proceeding

QuestionAnswer
Do I have standing?☐ Yes ☐ No
Do I have grounds?☐ Yes ☐ No
Do I have evidence?☐ Yes ☐ No
Is it financially worth it?☐ Yes ☐ No
Have I considered alternatives?☐ Yes ☐ No
Am I prepared for family fallout?☐ Yes ☐ No

Key Time Limits

ActionDeadline
Inheritance Act claim6 months from probate
Enter caveatBefore probate granted
Respond to caveat warning14 days

Process Steps

StepDone
Get legal advice
Enter caveat (if needed)
Gather evidence
Try negotiation
Consider mediation
Court proceedings (last resort)

Find a Solicitor

Look ForWhy
Contentious probate specialistSpecific expertise
STEP memberEstate planning knowledge
Clear costs estimateKnow what you’re facing
Realistic adviceNot just what you want to hear

Contesting a will should be a last resort. The process is expensive, stressful, and damages family relationships permanently. Consider carefully whether the potential gain justifies not just the money, but everything else you’ll spend on it.

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Sources

  1. GOV.UK — Making a will