Your Will Does Not Govern Your Largest Accounts
People spend real money on a will and assume it directs their estate. For the largest assets most households own, it does not. Retirement accounts, life insurance and annuities pass by contract, to whoever is named on the beneficiary form held by the custodian. That form was probably completed in an afternoon years ago, has not been looked at since, and beats the will every time the two disagree.
- The answer:: A beneficiary designation is a contract with the custodian. It passes the asset directly and is not overridden by anything your will says.
- Naming nobody is a decision too:: With no valid beneficiary the account usually defaults to the estate, which forfeits the favourable distribution options a named individual would have had.
- Divorce does not automatically fix it:: An ex-spouse named on an old form frequently remains entitled. State law varies and federal plan rules can override it.
- Contingents matter more than people think:: If the primary beneficiary has died and no contingent is named, the account usually falls to the estate with the same loss of options.
Where the AI summary above gets this wrong
"Make sure your will is up to date so your assets go to the right people."
That's surface-true. Here's what it misses:
- The will does not reach the biggest accounts — Retirement accounts, life insurance and annuities pass by beneficiary designation, outside the will and outside probate. For most households those assets are the majority of the estate, so a perfect will can direct a minority of what you own.
- The consequence is tax, not just destination — Who inherits determines which distribution rules apply. A named individual generally has a longer window to draw the account down; an estate beneficiary typically faces a much shorter one, compressing the same balance into fewer years and higher brackets.
- Nobody reviews the forms — Wills get revisited after a marriage, a birth, a divorce. Beneficiary forms sit with custodians and are never prompted. The commonest estate failure I encounter is not a bad will — it is a good will alongside a form naming someone from a previous life.
01 Two systems, and only one of them is the will
Property passes at death in two ways. Assets held in your own name with no beneficiary attached pass through probate and are distributed according to your will. Assets with a valid beneficiary designation pass by contract, directly to the person named, without touching the will or the probate process at all.
The second category covers most of what a retired household owns: IRAs, 401(k)s and other workplace plans, life insurance policies, annuity contracts, and accounts held with a transfer-on-death registration. The will has nothing to say about any of them.
Where the two conflict, the designation wins. A will leaving everything equally to three children does not divide an IRA that names one of them. This is not a technicality that a court untangles later — it is the intended operation of the arrangement.
Source: Publication 559, Survivors, Executors, and Administrators
02 What naming nobody actually costs
Leaving the form blank does not send the account to your will. It usually sends it to your estate under the custodian's default terms, and that is materially worse than either alternative.
The reason is the distribution rules. A named individual beneficiary generally gets a longer window to empty an inherited retirement account, which spreads the taxable income across years and brackets. An estate beneficiary typically faces a much shorter one, compressing the same balance into fewer, larger, more heavily taxed years — the mechanics of which sit inside the distribution rules generally.
The same loss follows when the primary beneficiary has predeceased you and no contingent was named. It is the more common failure of the two, because the form was completed correctly at the time and simply never revisited as circumstances changed.
Shows: how compressing the same balance into fewer years raises the annual income and therefore the tax, which is what a missing beneficiary designation usually costs. Ignores: the bracket creep a larger annual amount causes, probate costs, and growth inside the account.
Source: Publication 590-B, Distributions from Individual Retirement Arrangements
03 The twenty-minute review
The remedy is administrative rather than legal, and it does not require a solicitor. List every account that has a beneficiary form — each IRA, every current and former employer plan, life insurance policies including any provided at work, annuities, and any transfer-on-death registrations — and check each one against what you now intend.
Old employer plans are where the errors concentrate. A 401(k) left behind at a job you departed in 2009 still carries the form you completed on your first day there, naming whoever mattered then. Consolidating those accounts solves the problem as a side effect, which is a reason to consider it beyond the usual ones — though a rollover has its own considerations.
Three specifics worth checking rather than assuming. Name contingent beneficiaries as well as primary ones. Take advice before naming a trust as beneficiary of a retirement account, because the distribution treatment depends on how the trust is drafted. And after a divorce, confirm in writing what the designation now says rather than relying on the decree to have changed it.
This is the cheapest fix in estate planning and the one most often left undone, because nothing prompts it. A will gets revisited when life changes; a beneficiary form sits with a custodian who has no reason to contact you. I have seen a carefully drafted estate plan sit alongside a 401(k) still naming a spouse who had been divorced for eleven years, and the form won. Twenty minutes with a list of your accounts is worth more than most of what people spend on this subject, and it is the part nobody sells you.
FAQ
Does my will control who inherits my IRA?
No. An IRA passes to whoever is named on the beneficiary form held by the custodian, outside the will and outside probate. Where the will and the form disagree, the form governs.
What happens if I do not name a beneficiary?
The account usually defaults to your estate. That is worse than naming someone, because an estate beneficiary generally faces a shorter window to empty an inherited retirement account, compressing the taxable income into fewer years and higher brackets.
Does divorce remove my ex-spouse from my beneficiary forms?
Not reliably. Some state laws revoke designations on divorce, but federal rules governing workplace plans can override them, and IRAs and insurance policies may be unaffected. The only dependable step is to update each form directly and confirm the change in writing.
Sources
Regulator references
- Publication 590-B, Distributions from Individual Retirement Arrangements · Internal Revenue Service · 2025How the named beneficiary determines the distribution rules that follow.Last verified: 2026-09-07
- Publication 559, Survivors, Executors, and Administrators · Internal Revenue Service · 2025What passes through the estate and what passes outside it.Last verified: 2026-09-07
- Publication 575, Pension and Annuity Income · Internal Revenue Service · 2025Survivor treatment of pension and annuity benefits.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.