Wills, trusts, and
the one mistake that costs the most.

READ7 min · UPDATED
Reviewed against primary sources cited at the bottom of this page.

Most people do not have a will. Most people who do have one do not have beneficiary designations set correctly. Here is what a will does, when a trust makes sense, what a healthcare directive is, and the single most common estate planning mistake.

This page covers US-specific accounts and tax law. Outside the US? The priority order is the same, the account names differ (ISA in the UK, TFSA/RRSP in Canada, Super in Australia, etc.).
READ FIRST

This is educational, not legal advice. Estate law varies significantly by state. Complex estates need a licensed estate attorney. The content below is a map of the territory, not a set of legal instructions. Not financial or legal advice.

THE SHORT VERSION

Beneficiary designations override your will. A 401(k) or IRA with an ex-spouse still listed goes to the ex-spouse regardless of what your will says. Update them after every major life event. This is the single most common and costly estate planning mistake, and it is free to fix.

What a will does

A will tells courts: who gets your assets, who becomes guardian of your minor children, and who serves as executor of your estate.

A will does NOT: transfer assets with beneficiary designations (IRAs, 401(k)s, life insurance), transfer jointly owned assets with right of survivorship (those pass to the surviving owner automatically), or avoid probate (a will goes through court).

Beneficiary designations, the most important thing

These accounts pass outside your will entirely: 401(k) and employer retirement plans, IRAs (Traditional and Roth), life insurance policies, annuities, bank accounts with POD (payable on death) designation, brokerage accounts with TOD (transfer on death) designation.

THE OVERRIDE RULE

Whatever name is listed as beneficiary on these accounts receives the money, regardless of what your will says ×DON'T TRUST, VERIFYClaim: Beneficiary designations on retirement accounts and life insurance override will provisions.Verify at: DOL on retirement beneficiaries ↗ERISA-governed plans have especially strict beneficiary rules. Egelhoff v. Egelhoff (2001) confirms at the Supreme Court level..

The ex-spouse problem: many people list a spouse as beneficiary when married, divorce, do not update. Spouse is still listed. Spouse gets the money. This has produced famous Supreme Court cases.

Check your beneficiaries right now: every retirement account, every life insurance policy, every bank account with a POD. Set up primary AND contingent beneficiaries on everything. This is a 30-minute task that can matter more than a will.

Do you need a trust?

A revocable living trust avoids probate (assets transfer without court), keeps the estate private (wills become public record, trusts do not), costs more to set up ($1,000 to $3,000+ attorney fees), and must be properly funded (assets retitled into the trust's name).

NEED A TRUST
  • Multiple properties or business interests
  • Probate in multiple states to avoid
  • Control over how and when heirs receive assets
  • Special-needs beneficiary
  • Estate approaching state estate-tax thresholds
SIMPLE WILL IS ENOUGH
  • Single-state assets
  • Straightforward inheritance wishes
  • Beneficiary designations already set correctly
  • Estate under state exemption

Healthcare directives

Two documents most people do not have and everyone should:

  1. Healthcare Power of Attorney (or Healthcare Proxy): names someone to make medical decisions if you cannot. Without this, courts decide and family members may fight.
  2. Living Will (Advance Directive): specifies what treatments you do or do not want in specific situations (terminal illness, persistent vegetative state). Guides your healthcare proxy.

These are separate from your financial will. Both should exist. Many states offer standard forms free from state medical or bar associations. An attorney review is worthwhile, but these documents do not strictly require one to execute.

Digital and Bitcoin estate planning

For Bitcoin holders, your heirs need three things: that the Bitcoin exists, where it is (which wallet), and how to access it (seed phrase). Do not put seed phrases in a will. Wills become public record through probate. A seed phrase in a will becomes a publicly accessible theft instruction.

Consider a "digital assets memorandum," a private document (not part of the public will) that your executor knows exists and can access. Can include password manager, email accounts, social media, domain names, exchange accounts, and secure pointers to hardware wallets or seed phrase storage.

For the full Bitcoin-specific treatment, see Bitcoin Inheritance.

How to actually get a will done

DIY ($100-300)

Simple situations: Trust & Will ↗, LegalZoom, Fabric. Templates. Limitations for complex situations.

ATTORNEY ($500-5,000+)

Simple will + healthcare directive: $500-1,500. Full estate plan with trust: $2,000-5,000+. State bar referral. ACTEC specialists ↗ for complex estates.

Probate and how to avoid it

Probate is the legal process of validating a will and distributing assets under court supervision. People try to avoid it for three reasons: it is a public record (anyone can see what you owned and who received it), it takes 6-18 months in most states, and it can cost 3-8% of the estate in court and attorney fees ×DON'T TRUST, VERIFYClaim: Probate typically takes 6-18 months and costs 3-8% of the estate.Verify at: American College of Trust and Estate Counsel ↗ACTEC publishes practitioner guidance; figures vary widely by state and estate complexity..

How to avoid probate

  • Beneficiary designations. Accounts with named beneficiaries transfer directly, bypassing probate. Includes retirement accounts, life insurance, TOD (transfer-on-death) and POD (payable-on-death) accounts. Must be kept current; an ex-spouse named as beneficiary can still inherit.
  • Joint ownership (JTWROS). Joint Tenancy with Right of Survivorship automatically passes to the survivor. No probate for that asset. Different from tenancy-in-common, which does go through probate.
  • Living trust. Assets transferred into a revocable living trust bypass probate because the trust owns the asset, not you. Costs more to set up than a will. Requires ongoing maintenance: new assets must be re-titled in the trust's name.
THE MOST COMMON PROBATE MISTAKE

Having a will with one set of beneficiaries and a retirement account with a different (or no) beneficiary named. The retirement account does NOT follow the will; it follows the beneficiary designation on file with the custodian. Update beneficiary designations every time a major life change occurs (marriage, divorce, birth, death of a named beneficiary).

Advanced estate and giving structures

US-only. Each of the structures below is part of US tax law and requires US-licensed professional involvement.

1031 exchange (real estate)

A 1031 exchange is a tax-deferred exchange of one investment property for another. No capital-gains tax at the time of the exchange. Tax is deferred until eventual sale.

  • Both properties must be "like-kind" (investment real estate for investment real estate, not primary residence).
  • Must use a Qualified Intermediary (QI). You cannot touch the proceeds.
  • 45 days to identify replacement property.
  • 180 days to close on replacement property ×DON'T TRUST, VERIFYClaim: Section 1031 like-kind exchanges are limited to real property. The 45-day identification and 180-day closing windows are statutory.Verify at: IRS 1031 like-kind exchanges ↗TCJA (2017) limited 1031 to real property only. Personal property and crypto are excluded..
  • The Bitcoin angle: 1031 does not apply to Bitcoin. Real property only.

Donor-Advised Fund (DAF)

A charitable giving account that lets you take a deduction now, invest the funds tax-free, and distribute to charities on your timeline.

  • Contribute cash, stock, Bitcoin, or other appreciated assets.
  • Take a charitable deduction immediately, in the year of contribution.
  • Assets grow tax-free inside the DAF.
  • Distribute to qualifying charities at any time, on your schedule.

For Bitcoin holders: donate appreciated Bitcoin directly to the DAF. Avoid all capital-gains tax on the appreciation. Take a deduction for the full fair market value.

EXAMPLE

Bitcoin bought for $5,000 now worth $100,000. Sell and donate $100,000 cash: pay capital-gains tax on $95,000 of gain. Donate Bitcoin directly to DAF: no capital-gains tax, $100,000 deduction at fair market value ×DON'T TRUST, VERIFYClaim: Donating long-term-held appreciated property (including Bitcoin held more than 1 year) to a 501(c)(3) public charity allows full fair-market-value deduction with no recognition of capital gain.Verify at: IRS Charitable Contributions ↗Subject to 30% of AGI limit for appreciated capital-gain property to public charities; carry-forward applies..

Where to open: Fidelity Charitable, Schwab Charitable, Vanguard Charitable. Each accepts Bitcoin donations.

Qualified Charitable Distribution (QCD)

Direct transfer from a Traditional IRA to a qualifying charity. Counts toward Required Minimum Distributions (RMDs) without being taxable income.

  • Who it is for: people 70½+ with Traditional IRAs who would otherwise take RMDs as taxable income.
  • Transfer up to $108,000 in 2026 (indexed for inflation) directly from IRA to charity ×DON'T TRUST, VERIFYClaim: 2026 QCD limit is approximately $108,000 (indexed annually). Available to IRA owners 70½+.Verify at: IRS IRA distributions FAQ ↗SECURE 2.0 indexed the QCD limit. Verify the current-year amount..
  • Counts toward your RMD.
  • Not included in your taxable income.
  • Cannot also claim a charitable deduction. The exclusion from income is the benefit.

When QCDs beat regular giving: if you take the standard deduction (most people post-TCJA), a normal charitable deduction provides no benefit. A QCD reduces income directly, which also reduces IRMAA exposure, Medicare premiums, and SS taxation. See IRMAA: The Medicare Income Surcharge.

Special Needs Trust (SNT)

A legal structure that holds assets for a disabled beneficiary without disqualifying them from government benefits (Medicaid, SSI).

  • First-party (d4A): funded with the disabled person's own assets. Requires Medicaid payback at death.
  • Third-party: funded by family members. No payback requirement. Most common for inheritance planning.
  • Pooled: managed by a nonprofit. Useful for smaller amounts.

Action required: this requires an attorney specializing in special-needs planning. Do not attempt DIY. Find one through the Special Needs Alliance ×DON'T TRUST, VERIFYClaim: Special Needs Alliance is a national organization of attorneys specializing in disability and elder law.Verify at: specialneedsalliance.org ↗SNA members are vetted attorneys with specific practice expertise..

Last updated 2026-04-27. Not legal advice. Estate law varies by state. Complex estates need an estate attorney.

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