How to Make a Codicil to a Will in Estate Planning

A codicil is a legal document that allows you to amend or supplement an existing will without having to draft a completely new will. In the context of estate planning in England and Wales, a codicil is a recognised method for making minor changes to your testamentary intentions after your will has been executed (signed and witnessed). It can save time and cost compared with making a new will, provided it is used appropriately and meets all formal legal requirements.

This article explains what a codicil is, when you might choose to use one, how to make one correctly, the legal requirements it must satisfy, common risks and pitfalls, and practical steps to follow.

What Is a Codicil?

In legal terms, a codicil is a written supplement to an existing will that amends, adds to, or explains specific provisions in that will. It does not replace the whole will, but becomes part of the testamentary documents that the courts will consider when administering your estate at death. A codicil must be linked clearly to the original will and must be properly executed under the same formalities as a will itself.

Common reasons for using a codicil include:

• Changing one or more beneficiaries
• Updating the appointment of executors
• Adding a legacy such as a specific gift of money or property
• Making small changes to funeral arrangements or other personal wishes

In general, a codicil is suitable only for minor adjustments. Major revisions or complex changes are typically best handled by drafting a new will.

Legal Requirements for a Valid Codicil

A codicil must satisfy strict formalities to be valid under the law of England and Wales. These requirements mirror those for a will and are primarily governed by the Wills Act 1837.

1. Written Document

A codicil must be in writing. It cannot be verbal or implied. You should clearly state that the document is a codicil to your will by naming the original will and its date.

2. Testamentary Capacity

The person making the codicil (the testator) must be of sound mind and fully understand the nature and effect of the changes they are making. This includes understanding the property affected, who will benefit, and the legal consequences of the codicil.

3. Signature by the Testator

The testator must sign the codicil, or acknowledge their signature, in the presence of two independent adult witnesses at the same time.

4. Independent Witnesses

Two witnesses must watch the testator sign the codicil and then sign it themselves in the testator's presence. Witnesses must be adults (over 18) and must not be beneficiaries under the codicil or will, or spouses/civil partners of beneficiaries. Using a beneficiary as a witness can lead to that part of the codicil being invalid.

5. Separate Document

A codicil must be a separate document and must not be attached physically to the original will (for example by pins, staples or paper clips). Modifying the will directly after it has been executed risks invalidating the entire will and any codicil.

Step‑by‑Step Guide to Making a Codicil

Follow these steps when creating a codicil to ensure that it is legally enforceable:

1. Decide If a Codicil Is Appropriate

Consider whether your changes are truly minor. If you are making multiple or complex changes, or if your original will is old or unclear, it may be more appropriate to create a new will. Relying on numerous codicils over time can create confusion and potential legal challenges.

2. Draft the Codicil

Begin by clearly identifying:

• Your full name and address
• The date of your original will
• A statement indicating that this document is a codicil to that will

Detail the specific changes you want to make. Be clear and specific to avoid ambiguity. For example, if you are adding a new beneficiary, state their full name and what they are to receive.

3. Sign and Date the Document

Sign the codicil in ink at the end of the document in the presence of your two witnesses. The witnesses must then sign in your presence and in each other's presence. Include dates and witness contact details if possible.

4. Keep It with Your Original Will

Once executed, store the codicil with your original will in a safe place. Executor(s) and trusted persons should be informed where these documents are kept. Bank or solicitor storage is common, but always ensure access after your death.

Practical Considerations and Common Pitfalls

When to Consider a New Will

If your changes involve substantial redistribution of your estate, changes to trusts, or multiple amendments, drafting a new will may provide greater clarity and reduce the risk of disputes. A new will can also expressly revoke all previous wills and codicils, reducing ambiguity.

Risk of Confusion

Using multiple codicils over time can create interpretative challenges for executors and the probate registry. Executors must trace the sequence of documents and reconcile any inconsistencies. Keep your estate documents organised and clear.

Loss or Misplacement

A codicil that is lost or separated from your will at the time of probate may not be recognised, and intended changes might not take effect. Store both documents together and ensure trusted persons know their location.

Seek Professional Review

While you can draft a codicil yourself, consulting a solicitor or qualified will‑writing adviser ensures that the language and formalities are correctly applied and reduces the risk of later challenges. Professional advice is especially important where your estate is substantial or your changes have complex tax or legal implications.

After a Codicil Is Made: Probate Considerations

When you die, your executors will need to present your original will and any codicils to the Probate Registry as part of the application for a Grant of Probate. Only original signed documents can be accepted by the registry; photocopies will not suffice.

Common Questions from our Readers

Can I use the same witnesses as for my original will?
Yes. You may use the same witnesses you used for your original will, but it is not required. They must, however, still meet the independence requirements.

Do codicils become public?
Yes. Both your will and any codicils become part of the public record once submitted as part of the probate process.

Can a codicil overturn an earlier codicil?
Yes. You may have multiple codicils, and later codicils can amend earlier ones, but clarity is essential to avoid contradictions.

What happens if my codicil is not valid?
If a codicil fails to comply with legal formalities, its provisions will not be effective. The estate will be distributed under the terms of the original will as if the codicil did not exist. Proper execution is therefore critical.

Key Takeaways

A codicil is a powerful legal tool for making minor adjustments to an existing will in England and Wales without the need to draft a new will. To be valid, it must be:

• Clearly written and linked to the original will
• Signed by the testator
• Witnessed by two independent adults
• Stored safely with the original will

Codicils should be used with care, and for complex or significant changes you should consider drafting a new will. Professional legal advice can help ensure that your intentions are properly expressed and legally effective.