7 Common Estate Planning Mistakes to Avoid

Short answer: The mistakes that actually hurt California families are not missing signatures. They are a plan that never got updated, incapacity documents that were never signed, a will that was never paired with a funded trust, and children who find out about the plan for the first time at the funeral. California has no state estate tax, but the federal exemption still matters for larger estates: it sits at $15,000,000 per person for 2026, under Internal Revenue Code § 2010(c). Most of these mistakes cost nothing to avoid. They just take attention.

Why does an outdated estate plan cause problems?

An estate plan is not something you sign once and file away. A will or trust drafted years ago still reflects the family, the assets, and the intentions you had at the time. Marriage, divorce, a new child, a death in the family, or a move out of state can all leave an old plan pointing in the wrong direction.

The practical risk is that outdated beneficiary designations on life insurance or retirement accounts can send money to an ex-spouse or a person who died before you, regardless of what your will says. A will drafted before a second marriage may say nothing about stepchildren. Review your plan after any major life event, not on a fixed calendar you will forget to follow.

What happens if you never name a guardian for your children?

If both parents die or become unable to care for minor children and no guardian has been legally nominated, a California court decides who raises them. The judge does not know your family, your values, or who you would have trusted. Naming a guardian, and a backup guardian in case the first choice cannot serve, is one of the simplest documents in an estate plan and one of the most consequential if it is missing.

Talk to the people you are considering before you name them. Confirm they are willing and understand what the role involves, both raising the children and managing anything left to them.

Do you need incapacity planning if you are healthy right now?

Estate planning is not only about what happens after death. A stroke, an accident, or a sudden diagnosis can leave you unable to manage your own finances or make your own medical decisions long before anyone is thinking about a will. Without a signed durable power of attorney and an advance healthcare directive naming someone you trust, your family may have to go to court to get authority to act for you, at exactly the moment they can least afford the delay.

These documents let you choose, in advance, who handles your finances and who makes medical decisions if you cannot. They cost far less in time and stress than a court proceeding started after the fact. See our power of attorney page for how these documents fit into a complete plan.

How do estate and gift taxes actually affect a California family?

Most Californians will never owe federal estate tax. For 2026 the federal estate and gift tax exemption is $15,000,000 per person, or $30,000,000 for a married couple, under IRC § 2010(c). California itself has no state estate tax and no state inheritance tax, under Revenue and Taxation Code § 13301. That does not mean taxes are irrelevant. If you are giving money or property away during life, the 2026 annual gift tax exclusion is $19,000 per recipient, per donor, or $38,000 for a married couple who elects to split gifts. Gifts above that amount to one person require a gift tax return but generally trigger no actual tax owed until your lifetime gifts exceed the federal exemption.

The bigger tax issue for most families is not estate tax. It is capital gains basis: how and when you transfer property changes what your heirs pay if they later sell it. That is a separate conversation worth having with an attorney before you gift a house or investment property rather than leaving it at death.

Is a will enough, or do you actually need a living trust?

A will does not avoid probate. A will only takes effect once a court validates it through the probate process, the same public, court-supervised process an estate goes through if there is no will at all. The only way to keep your estate out of probate is a revocable living trust that is actually funded, meaning your assets are retitled into the trust’s name while you are alive. A trust sitting in a drawer with nothing transferred into it protects nobody.

A trustee and a probate executor are both fiduciaries who owe duties to the people who benefit from the estate or trust, but they operate under different rules. If you are unsure whether your current plan actually avoids probate, that is worth confirming rather than assuming. Our living trust page walks through how a properly funded trust works, and our probate page explains what your family faces if it does not.

Figures verified July 2026.

What to do next

Pull out whatever documents you currently have, a will, a trust, powers of attorney, and check the date and the names on them against your life today. If anything is missing, outdated, or you are not sure whether your trust was actually funded, talk to an estate planning attorney before it becomes your family’s problem to sort out.