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Estate Planning

Will vs. Trust in Illinois: Which One Your Family Actually Needs

A will works. It just works in a courtroom. What Illinois probate timelines, the $4 million estate tax exemption, and a business interest mean for the choice between a will and a trust.

Emad MahouJuly 29, 2026
Will vs. Trust in Illinois

She had just finished fourteen months as executor of her father's estate in the Cook County Probate Division. That was the reason she called. Not the two businesses.

Her husband runs a mechanical contracting company. She owns a small marketing agency. Between the two companies, a house in Oak Park, a rental unit, retirement accounts, and a life insurance policy nobody had thought about in years, they're worth considerably more than they say out loud. About a decade ago, when their kids were seven and four, they paid for a will package. Guardianship was the entire point back then. They named her sister, signed everything, put the binder on a shelf, and moved on.

Then her father died.

She spent more than a year publishing notices, filing an inventory, waiting out the creditor claims period, and explaining to her brother why she couldn't just write him a check. Every document she filed became a public court record. Her brother pulled the inventory off the docket and started asking questions about a number he found in it.

She sat down and said: I don't want my kids doing that.

That's the honest reason most people move from a will to a trust. Not tax planning. Not creditor protection. Somebody watched probate from the inside and decided against it.

This is a composite drawn from common consultations. Identifying details have been changed.

The will they bought wasn't defective

People get this part backwards. Their will works. It names an executor, directs where everything goes, and appoints guardians. If either of them died tomorrow, a Cook County judge would admit it and honor it.

The problem isn't whether it works. It's where.

A will is a set of instructions addressed to a probate court. It has no legal effect until someone files it, opens an estate, and asks a judge to admit it. Everything after that happens on the court's calendar, in the court's public file, under rules the court enforces.

A trust is different in kind. It's a separate legal owner that you create and control while you're alive. You transfer assets into it. When you die, the successor trustee you named already holds legal title and can act immediately. Nothing gets filed. Nobody waits for a hearing.

Side by side

WillRevocable Living Trust
When it worksOnly after death, and only after a court admits itThe day you sign and fund it, and continuously after
Court involvementProbate is required for assets titled in your name aloneNone for assets properly transferred into the trust
Time to reach your familyNine to twelve months in Cook County for a straightforward estate, longer if contested or supervised. A mandatory six-month creditor period sets the floor and cannot be shortenedDays to weeks. The trustee has authority the moment it's needed
PrivacyThe will, the inventory, the accountings, and every beneficiary's name and address become public court recordsPrivate. Disclosed only to the people entitled to see it
If you're incapacitated but aliveNothing. A will only speaks at death. Your family is looking at a guardianship petition unless a power of attorney covers itThe successor trustee steps in and manages trust assets without court involvement
A business interestThe membership interest sits in probate. For those months, your spouse can't vote it, sell it, or necessarily even get information about itThe trustee holds it and can act, provided the operating agreement permits the transfer and the assignment was executed
Illinois estate tax planningPossible through a testamentary trust, but most flat-fee will packages don't include one, and the structure has to be built inside probateBuilt in at signing, outside of court
ChallengesA will contest is a defined probate proceeding with a clear procedural pathHarder to attack. There's no probate case to file the challenge into
CostLower upfrontHigher upfront, and the assets have to actually be transferred in

That last line is the real tradeoff, and it's the one worth taking seriously. A trust costs more at signing and requires the work of retitling assets. Everything else on the table runs one direction.

Three Illinois rules that decide it

Illinois requires the estate representative to publish notice to creditors and then wait six months before the estate can close. That's 755 ILCS 5/18-3, and no judge has discretion to shorten it. In Cook County, an uncontested estate under independent administration commonly runs nine to twelve months from filing to final distribution. Supervised or contested estates run past a year routinely.

Probate is also a public file. The will, the inventory listing what your family owns, the accountings, the names and addresses of everyone inheriting. Anyone can read it. In the story above, that's how the brother found the number he wanted to argue about. Families that have never fought before find things to fight about when the balance sheet is posted on a public docket.

Then there's the tax, and this is where Illinois quietly punishes families who did the reasonable thing. The federal estate tax exemption is $15 million per person for 2026. Illinois sits at $4 million, isn't indexed to inflation, and isn't portable between spouses. If the first spouse to die leaves everything outright to the survivor, no Illinois tax comes due that day because of the marital deduction. The first spouse's $4 million exemption evaporates. The survivor then dies with a single $4 million exemption covering the combined estate, and Illinois rates climb to 16 percent.

Add a paid-off house, two business interests, retirement accounts, and a death benefit nobody counts as wealth while they're alive. Four million arrives sooner than people expect.

A revocable trust doesn't lower that tax on its own. Trust assets are still in your taxable estate. What the trust provides is the structure to capture the first spouse's exemption at the first death instead of losing it. A will can reach the same result through a testamentary trust. Most flat-fee will packages simply don't contain one.

When a will is genuinely enough

I'd rather tell you this now than sell you something you don't need.

A will is the right answer when your estate is modest and nothing requires a court order to transfer. Illinois lets heirs collect personal property up to $150,000 using a small estate affidavit for deaths on or after August 15, 2025, and vehicles registered with the Illinois Secretary of State don't count toward that threshold. That procedure doesn't reach real estate.

For the house, Illinois gives you the Transfer on Death Instrument (TODI), which passes real property to a named beneficiary outside probate. Retirement accounts and life insurance already pass by beneficiary designation and never touch a will. A younger couple whose assets are a house, a 401(k), and term life insurance can often get exactly where they want with a will, a TODI, and beneficiary forms that are actually current.

What that combination can't do is hold money for a beneficiary over time, protect an inheritance for a child who shouldn't receive a lump sum, plan around the Illinois exemption, coordinate a business interest, or let anyone manage your assets while you're alive and unable to. If you want the full walk-through of the probate-avoidance tools, I wrote one here.

The business problem

The two companies are why a will alone was never going to work for this couple.

A membership interest in a limited liability company is an asset like any other. Titled in your individual name, it goes to probate. For however many months that takes, your surviving spouse has no authority over it. Depending on what the operating agreement says, they may not be able to vote it, transfer it, or compel the other members to share information. The company meanwhile has payroll due, a line of credit, and customers who heard the owner died.

Assign that interest to a trust and the successor trustee has authority on day one.

That result depends entirely on execution. The operating agreement has to permit the transfer, and the assignment has to actually get signed. This is the step that gets skipped, and it's the reason plenty of people who paid for trusts still end up in probate. A trust you never funded is an empty box with your name on the lid.

What this costs against what probate costs

Our will-based plan starts at $3,000. Our wills and trust plan starts at $4,500.

Now price the alternative. Illinois doesn't set a statutory percentage for probate. Under 755 ILCS 5/27-2 the attorney is entitled to reasonable compensation as measured by the court, and probate work is generally billed hourly at prevailing rates. On top of that the estate pays court filing fees, publication of notice for three consecutive weeks, a surety bond premium unless the will waives it, and reasonable compensation to the executor. Put those together on an estate in the high six figures and the total commonly reaches into the tens of thousands of dollars.

The difference between our two packages is $1,500. The difference between a funded trust and a probate estate is a different order of magnitude, and your family pays that one during the worst month of their lives.

What this couple is doing

Two separate revocable trusts rather than one joint trust, because they own separate businesses and carry separate creditor exposure. Pour-over wills behind each one as a backstop. Powers of attorney for property and health care, which the old package included but which hadn't been touched since the kids were in grade school. Assignments of both membership interests, drafted only after reviewing each operating agreement. A deed moving the Oak Park house into trust.

The documents were the fast part. The funding is the work, and it's the part that determines whether any of it does what it promised.

Start with the right question

The question isn't which document is better. It's what has to happen for your family to get what you intend without a courtroom in the middle.

Every plan we build starts with a Family Future Planning Session. It's $450, runs about ninety minutes, and the fee applies toward whatever work follows. You'll leave knowing which direction fits your family, including the very real possibility that a will and a few beneficiary forms are all you need.

Schedule your Family Future Planning Session. Ninety minutes, $450, applied toward your plan. Serving Oak Park, Chicago, and families throughout Illinois. Book your session.


Mahou Law LLC is licensed in Illinois. This article is general information about Illinois law, not legal advice, and reading it doesn't create an attorney-client relationship. Estate planning results depend on your specific assets, family, and goals.

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