How to Sign and Witness a Codicil in the United Kingdom
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This flowchart helps you understand the key steps for signing and witnessing a codicil correctly in the United Kingdom. It is useful for avoiding common execution mistakes and links to more guidance on AI Generated British Codicil.
Codicil Signing Decision Tool
Where will the codicil be signed?
A codicil changes an existing will. The signing rules depend on the law that applies where the codicil is made and where the person making it is domiciled. Choose the UK jurisdiction most relevant to the codicil before signing.
Further Reading: GOV.UK: Making a will, GOV.UK: Wills, probate and inheritance
Disclaimer:
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Why Is Correctly Signing A Codicil Important In The UK?
A codicil changes an existing will, so it must be signed and witnessed correctly. If the formalities are not followed, the codicil may be invalid or a gift may fail. That can leave the estate distributed under the original will, or create a dispute after death.
What Can Go Wrong If A Codicil Is Not Witnessed Properly?
- The change may be ignored: the original will may continue to apply without the intended amendment.
- A beneficiary may lose a gift: in England, Wales and Northern Ireland, a beneficiary who witnesses the codicil can put their own gift at risk.
- The estate may face delay and cost: unclear execution can lead to probate problems or a challenge.
- Scottish rules differ: a codicil signed in Scotland should follow Scottish execution rules, including using an independent witness where appropriate.
How Can A UK Codicil Be Made Safer?
Use final wording, sign in the correct place, use independent witnesses, and keep the codicil with the will. If the change is large, complex, or likely to be disputed, it may be safer to make a new will or get professional advice. For general official guidance, see GOV.UK guidance on making a will.

This flowchart provides a simplified overview of legal concepts and should not be relied upon as legal advice. Always consider the specific facts of your situation and seek professional advice where appropriate.
Want to Generate Your own Codicil?
Docaro AI can help you write your own Codicil for use in the United Kingdom in minutes.
FAQs
In the United Kingdom, a codicil must generally be signed by the person making it in the presence of two independent adult witnesses, who must also sign in that person’s presence. The same formalities used for signing a will should be followed.
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