Simple definition
A codicil is a legal add-on to a will that changes part of it without rewriting the whole document. Think of it like an official amendment — you update one gift, swap an executor, or fix a detail. It must be signed and witnessed just like the original will. This is general education, not legal advice, and rules vary by state.
Why it matters
Life changes — a new grandchild, a move, a falling-out — and your will should keep up. A codicil lets you make a small update without drafting a brand-new will. Handled correctly it keeps your wishes current; handled sloppily it can create confusion or conflict with the original.
Real-life example
Say your will leaves $5,000 to a friend who has since passed away. Instead of rewriting the entire document, you add a codicil redirecting that gift to your niece. You sign it with witnesses, just like the will. The original stays intact, and the codicil legally amends that single instruction.
Common mistakes
- Scribbling changes directly on the will itself, which can invalidate it instead of amending it.
- Skipping the signing and witnessing formalities, so the codicil may not hold up.
- Writing a codicil that contradicts the will, creating confusion about which wish controls.
- Piling on so many codicils over time that the overall plan becomes tangled and unclear.
Pro tips
- For anything beyond a tiny tweak, consider a fresh will instead of stacking codicils.
- Sign and witness a codicil with the same formality required for the original will.
- Store the codicil right alongside the will so they're always found together.
- Because rules vary by state, have an estate attorney prepare or review it.
Related Money Dictionary terms
- WillA legal document that spells out who gets your property and who cares for your children after you die.
- TestatorThe person who makes a will and whose wishes it records for distributing their property after death.
- ExecutorThe person named in a will to carry out its instructions, pay debts, and distribute the estate.
- EstateEverything you own at death, including money, property, and belongings, minus what you owe.
- ProbateThe court process that validates a will, pays debts, and distributes property after someone dies.
Frequently asked questions
Can I just write changes on my will?
It's risky. Crossing out lines or writing in the margins can raise doubts about your intent and, in some cases, invalidate the will entirely. A codicil is the proper tool — a separate, signed, witnessed document that legally amends the will. Rules vary by state, so check your local requirements.
When should I use a codicil versus a new will?
A codicil suits a small, isolated change — updating one gift or naming a different executor. For major or multiple changes, a new will is usually cleaner and less prone to conflict. Too many codicils can muddy your wishes. An estate attorney can help you decide which path fits.
Does a codicil need to be witnessed?
Generally yes. A codicil must usually meet the same signing and witnessing formalities as the original will to be valid. Skipping these steps can render it unenforceable. Because requirements vary by state, confirm the local rules or work with an estate attorney. This is general education, not legal advice.
Knowing what Codicil means is knowledge — the first half. A brick gets placed when you act on it: list any part of your will that's now out of date and note whether a codicil or a new will fits better.
Sources & references
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Plain-English education — not personalized legal, tax, or investment advice.