An end-of-life planner is only helpful if people can trust it. That does not mean constant maintenance. Most sections can sit quietly for months; the trick is knowing which changes deserve an update.
Do a simple annual review
Once a year, scan contacts, policies, accounts, document locations and personal wishes. Write the review date on the planner even if nothing changed. That date is useful information in itself.
Aim for usable, not impressive. The best system is the one you can update in ten quiet minutes without needing to remember how you organized it six months ago.
Update after a major life event
Marriage, divorce, a death, a move, a new child, retirement, a business change or a significant financial shift can affect several sections at once. Use the event as a prompt to check what no longer matches reality.
The real audience for this information may be someone tired, worried and short on time. Give that future person obvious labels, a starting point and as few unnecessary detours as possible.

Update when a key person changes
If an attorney, accountant, insurance agent, executor, emergency contact or other important person changes, fix that immediately. Outdated contact details are one of the easiest problems to prevent.
Be cautious of rewriting the entire planner every year and assuming a beautiful binder must still be accurate. Both tend to turn a helpful idea into extra maintenance.
Update when documents move
A new safe, digital storage system, bank box or professional office means the locator page needs a quick correction. You do not want a perfectly organized planner pointing to the wrong place.
Keep a move beside the rest of the information that affects the same decision.
Review digital access more often
Online accounts change faster than paper documents. Check your recovery contacts and important accounts periodically, especially after changing your main email address or phone number.
Keep the reset small
A ten-minute review that ends with a current date is better than a beautiful planner nobody trusts because no one knows when it was last touched.
General information, not legal advice. The rules about wills, executors and access to accounts differ from country to country, and in the US from state to state. They also change. Check what applies where you live before you act on any of this.

