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The ten most common estate planning mistakes

Very few families will ever owe estate tax. Nearly every family will make one of these ten mistakes, and the cost shows up not as tax but as delay, legal fees, lost basis, and arguments.

This is the list, in the order a tax preparer runs into them. Most are not about money at all; they are about a title, a beneficiary form or a document that nobody read alongside the others.

We are tax preparers, not attorneys. This page explains how these things work so the conversation with your attorney starts in the right place; the documents themselves should be drafted by one.
  1. Joint titles that quietly override the will

    A parent adds a child to a bank account “so you can pay my bills,” or to the house deed “to avoid probate.” Three things follow. At death the account and the house go to that child alone, by survivorship, whatever the will says; the other children get what the will divides, which may be little. If the child is on the deed, half the house was a gift during life — it keeps the parent’s decades-old basis instead of stepping up, and a Form 709 was probably due. And the executor may find the estate has nothing left to pay the funeral, the last medical bills and the taxes. Between spouses the issue is different: everything jointly held passes to the survivor without using the first spouse’s exemption, which matters only if the estate never files for portability. The fix for the parent-and-child case in Colorado is almost always a beneficiary deed on the house and payable-on-death designations on the accounts: they avoid probate just as well, keep the full step-up, and leave the will in charge.

  2. Life insurance owned by the wrong person

    Life insurance paid to a named beneficiary is free of income tax. It is not free of estate tax if the insured owned the policy — a $2 million policy is $2 million in the taxable estate, and can carry a family that was nowhere near the exemption toward it. The cure, for people who need it, is for someone else to own the policy from the start: the beneficiary, or an irrevocable life insurance trust that owns the policy, receives the proceeds, and holds or pays them out under the insured’s instructions. A policy transferred within three years of death is pulled back into the estate anyway. The more common mistakes are smaller: a beneficiary who died years ago and was never replaced; no contingent beneficiary, so the proceeds fall into the probate estate; a minor named directly, so a court has to appoint a conservator; and a policy sold rather than given, which costs the proceeds their income-tax-free status under the transfer-for-value rule.

  3. No will, or a will from another life

    Without a will, Colorado’s intestacy statute decides — spouse, then children, then parents and siblings — and a court decides who raises a minor child. A will written when the children were small and the first spouse was alive can be nearly as bad. Review it when a child is born or adopted; when anyone named in it marries, divorces or dies; after a major tax law change; and when wealth changes a lot. Alongside it, the two documents that matter while you are alive: a durable power of attorney for finances and a medical power of attorney, so no one has to go to court to manage your affairs if you cannot. See wills and probate.

  4. No cash to pay the bills

    An estate has expenses on a clock: the funeral, the last medical bills, a year or two of property taxes and insurance while the house sells, the attorney, the accountant, the final income tax, and — for the few — the estate tax, due nine months after death. Families routinely underestimate the total, and an estate that is mostly a house, a business or an IRA has nothing liquid to pay it with. The IRA can be cashed, at the heir’s tax rates. The house can be sold under pressure. The business often cannot. A modest life insurance policy, or simply a cash reserve the executor can reach, is the usual answer.

  5. The wrong executor

    People name the oldest child because it is expected, or a friend because it feels like an honor. It is a job: gather everything, pay everyone, distribute the rest, keep records, file returns, meet deadlines, carry personal liability, usually for no pay. The right person is organized, available, likely to outlive you, on speaking terms with the beneficiaries, and willing. Name a successor. An heir as executor is normal, but it is a conflict of interest when the heirs disagree; a bank or a professional fiduciary is worth the fee for a difficult estate or a difficult family. Tell the executor in advance, and tell the family who it is.

  6. Everything to the spouse

    “I leave everything to my wife” is the most common will in America, and for most couples it is fine. Two things to know. First, the unlimited marital deduction means no estate tax at the first death, but it also means the first spouse’s $15 million exemption goes unused unless the estate files a Form 706 to carry it over (portability). No tax is due and the filing is simple, and under a special IRS procedure it can be done up to five years after death; it should be done whenever the combined estate could conceivably reach the exemption twenty years on. The older alternative, a bypass trust that holds the first spouse’s exemption amount for the children while supporting the survivor, is still used by couples who want the children’s inheritance protected from a remarriage. Second, the non-tax problem: if one spouse handled all the money, the other inherits a portfolio, a rental or a business at the worst possible moment with no experience running it. A trust with a co-trustee, or a relationship with an advisor established beforehand, addresses that.

  7. The right asset to the wrong person, in the wrong way, at the wrong time

    A large inheritance outright to a nineteen-year-old. An IRA left to a trust that was never written to receive one. The family business split equally among a child who runs it and two who do not. A disabled child left money outright, which costs him his benefits. Each is solved with a trust that holds the asset and pays it out on terms — at ages, for purposes, or for life — and by matching each asset to the heir who should have it. The same mistake in miniature is the beneficiary form with no contingent beneficiary, so the asset ends up in probate when the primary beneficiary has died first.

    Three more versions of the same mistake, all fixable only in advance. S corporation stock left to a trust: a trust can hold S corporation shares for only two years after the death; after that the beneficiary or trustee must make a QSST or ESBT election or the S election terminates for everyone. The house left in a bypass trust: if the surviving spouse keeps living in a home the trust owns, a later sale by the trust gets no $250,000 home-sale exclusion — a trust cannot “live” anywhere. Trustee powers that tax the wrong person: a trustee who can distribute to himself is taxed on the trust’s income whether or not he does; a beneficiary who lets an annual withdrawal right lapse becomes the income-tax owner of a growing slice of the trust. All three are drafting choices.

  8. The unfunded trust

    A couple pays an attorney for a revocable living trust, signs it, and puts it in the drawer. The house stays in their names; the accounts stay in their names. At death nothing is in the trust, so everything goes through the probate the trust was bought to avoid, caught by the pour-over will. We see this often enough to check for it on every estate. If you have a trust, the deed and the account registrations should say the trust’s name — and the retirement accounts should name the right beneficiaries, which is usually a person and not the trust. The business owner’s version of this mistake is the missing buy-sell agreement: the surviving owners have no obligation to buy and no cash to buy with, and the heirs own a share of something they cannot sell.

  9. No records

    The executor’s first weeks are spent looking: for the will, the deeds, the statements, the policies, the passwords, the key to the safe deposit box, the name of the accountant. Every hour costs the estate money. Keep an up-to-date list — where the documents are, every account and advisor, the digital logins — where the executor can find it, and not only in a safe deposit box the executor cannot open. For the preparer, the records that matter most are basis records: what was paid for the house and the stock, and the date-of-death values of everything inherited, which set the heirs’ basis for life. An estate large enough to file a Form 706 must also give each heir a Form 8971 Schedule A stating those values.

  10. No plan at all

    Each of the nine above is usually a symptom of this one. The will, the titles, the beneficiary forms, the insurance and the trust were each set up at a different time by a different person for a different reason, and nobody has read them together. An estate plan is the act of reading them together — with the attorney who drafts, the tax preparer who knows the basis and the income side, and the insurance and investment people — and then reviewing them every few years. It is not a wealthy person’s exercise. The families with the most trouble are usually the ones with a house, an IRA and three children.

Behind the scenes

None of these shows up as a line on a tax return, which is why they are discovered after a death rather than before. What we see on the return is the aftermath: a house sold with a gift basis instead of a stepped-up one, an IRA emptied in a year because the beneficiary form was wrong, a Form 706 that was never filed for a widow who now needs the exemption. When a client mentions adding a child to a deed or an account, we ask about it before it happens, because afterward there is usually nothing to fix.

The Colorado side

Colorado has no estate or inheritance tax, so none of these mistakes costs the family anything at the state level; the costs are federal basis, probate fees, delay, and income tax on inherited retirement money. Colorado’s beneficiary deed, small-estate affidavit and informal probate make the first mistake on this list unnecessary — there is no need to put a child on the title to avoid probate here.

What to bring your preparer

  • A list of what you own and how each item is titled — alone, jointly, in trust, with a beneficiary deed
  • The current beneficiary on every retirement account, annuity and life insurance policy, and the contingent beneficiary
  • Who owns each life insurance policy and its face amount
  • Your will, trust and powers of attorney, with their dates
  • What you paid for the house and for any stock or property you intend to leave or give
  • If a spouse has died: whether a Form 706 was filed for portability

Questions people ask

We’re nowhere near $15 million. Does any of this apply to us?

Almost all of it. Only two items on the list are about estate tax. The rest — titles, beneficiaries, the executor, the unfunded trust, the records — cost ordinary families basis, fees and months of delay every year.

My husband died last year and everything came to me. Did we make a mistake?

Not yet. Ask whether a Form 706 was filed to carry over his unused exemption. If not, the IRS allows a late portability-only return up to five years after death. Whether it is worth filing depends on what the combined estate might be worth decades from now — and the answer is usually yes, because filing costs little and the exemption is not guaranteed to stay at $15 million.

Is it a mistake to leave the IRA to my trust?

Often. A trust that is not written specifically to receive retirement accounts can force the whole IRA out, and taxed, within five years. Naming people directly, with the trust only where a beneficiary needs protection, is the usual advice — and the trust document has to be drafted for it.

Should I just add my daughter to the deed so she can sell the house when I’m gone?

In Colorado, record a beneficiary deed instead. She gets the house at your death without probate, with a full step-up in basis, and you keep complete control — and the right to change your mind — while you are alive.

Forms and official pages named in this article

Sources and where to check

Updated October 24, 2026 · tax year 2026 figures

Want a second pair of eyes on the tax side of your plan?

We can tell you what each title, gift and beneficiary choice will do to the basis and the income tax before the attorney drafts anything. In person in Lone Tree or remotely, year round.