The legal logic is simple: a beneficiary designation is a contract with the financial institution, and the asset passes under that contract at the moment of death. Your will only governs probate assets — things titled in your individual name with no designated beneficiary and no joint owner. A retiree with a $1.8M IRA, a $400K 401(k), life insurance, and a transfer-on-death brokerage account could have a meticulous will that legally controls almost nothing but the cars and the furniture.

Arizona extends the designation system further than many states. Real estate can pass outside probate through a beneficiary deed under A.R.S. 33-405 — recorded now, effective only at death, revocable anytime. Bank accounts take payable-on-death designations; brokerage accounts take transfer-on-death registrations. Used deliberately, this stack can move essentially an entire estate outside probate without a trust. Used carelessly, it creates the classic Arizona estate failure: a will that says 'equally to my three children' while the actual accounts — via forms filled out across three decades — say something else entirely.

Arizona law does provide one safety net, with a dangerous exception. Under A.R.S. 14-2804, divorce automatically revokes designations in favor of a former spouse for most assets governed by state law. But employer plans like 401(k)s are governed by federal ERISA law, which preempts the Arizona statute — the U.S. Supreme Court has held that the plan must pay the named beneficiary, period. An ex-spouse left on a 401(k) form after an Arizona divorce can still collect, regardless of what the divorce decree or state statute says. The only fix is updating the form itself.

Designations also carry the tax plan. The SECURE Act's ten-year rule, spousal rollover options, charitable allocations, per-stirpes treatment for grandchildren if a child predeceases you — all of it executes through the beneficiary forms. Naming your estate or an unsuitable trust as IRA beneficiary can force the worst payout schedule available and drag a probate-free asset into probate. The forms are not administrative trivia; they are the operative documents of the plan.

Run a beneficiary audit before you touch anything else in your estate plan. Pull the current designation — primary and contingent — for every retirement account, insurance policy, annuity, and POD/TOD registration, and check the recorded status of any beneficiary deed. Most new clients we review have at least one form that contradicts their intentions: an ex-spouse, a deceased parent, an estranged sibling from 1998, or simply 'estate.'

Coordinate the forms with the tax design, not just the people. If the plan calls for Roth dollars to the high-earning child, traditional dollars to charity or the lower-bracket child, and the house by beneficiary deed, the designations are where that design becomes real. Then re-verify after every divorce, death, remarriage, custodian change, and 401(k) rollover — designations do not transfer automatically when accounts move.

Name contingents everywhere. If your primary beneficiary dies before you and there is no contingent, the asset typically falls to your estate — buying probate, creditor exposure, and the least favorable IRA payout rules in one stroke.

• Updating the will after a major life event but not the beneficiary forms — the forms win, and the will cannot fix them.
• Leaving an ex-spouse on a 401(k). Arizona's revocation-on-divorce statute does not reach ERISA plans; federal law pays the form as written.
• Naming your estate (or leaving the line blank) on an IRA, which forces probate and generally the worst available distribution schedule for heirs.
• Skipping contingent beneficiaries, so a primary's earlier death quietly reroutes the asset to the estate.
• Recording an Arizona beneficiary deed that conflicts with the trust or will and was never coordinated with the rest of the plan — the deed controls the house regardless.