Can my sister sell Mom's house in the trust without telling us?

Written and reviewed by Dr. Pat Pachciarz® · Updated October 10, 2026 · Educational, not individual legal, tax or investment advice. Illinois law as of October 2026.

The short answer

Often, yes. An Illinois trustee can usually sell a house the trust owns without asking or telling the family first. Unless the trust limits it, a trustee has the same powers over trust property that an unmarried owner has over their own (760 ILCS 3/815), including the power to sell property at a public or private sale (760 ILCS 3/816). Illinois' duty-to-inform section says it doesn't require a trustee to tell beneficiaries in advance of trust transactions (760 ILCS 3/813.1(j)). That doesn't mean anything goes. The trustee must act in good faith and by the trust's terms and purposes (760 ILCS 3/801). If the trust is still revocable and Mom has capacity, the trustee answers to Mom, and Mom can direct the trustee (760 ILCS 3/603). A sale where the trustee has a personal stake, like buying the house herself, can generally be undone by an affected beneficiary (760 ILCS 3/802). The calm move is to ask early, in writing, before a listing goes up.

One former live-in caregiver on an online legal forum described just finding out that a sister, the trustee of their mom's trust, intended to accept an offer far below what the house is worth and give the family 30 days to move out. Finding out late, more than the sale itself, is what usually starts the fight.

Why does this matter so much?

• A sale is hard to undo. Once the house closes, getting it back is slow and expensive, even when a court agrees something went wrong.
• Timing changes the taxes. A sale during Mom's life and a sale after she passes can be taxed very differently (IRS Publication 523; IRS Publication 551).
• The house is often the biggest asset. It may be what pays for Mom's care, or most of what the family inherits.
• Silence breeds suspicion. A sale nobody heard about looks worse than it is, even when the price is fair.

How do I figure out where we stand?

1. Is the trust revocable today, and can Mom still decide? If yes, the trustee's duties run to Mom, and Mom can tell the trustee what to do (760 ILCS 3/603). Ask Mom, gently, what she wants for the house.
2. Read the trust's real estate language. Some trusts require notice, consent, an appraisal, or say who may live in the house. Others give the trustee full discretion.
3. Ask why, and at what price. A fair trustee can explain the reason (care costs, upkeep, an empty house) and how the price was set.
4. Look for a conflict. Is the buyer the trustee, her spouse or a business she owns? That's the kind of sale Illinois law lets an affected beneficiary challenge (760 ILCS 3/802).
5. Know the last resort. If a breach of trust has occurred or may occur, an Illinois court can stop the trustee from committing it or order other relief (760 ILCS 3/1001). That's an attorney's call, and timing matters.

Who needs to be in the room?

The trustee holds the deed, the realtor sets the price, the estate attorney knows the trust, the CPA knows the tax cost, and the siblings hear about it last. That's a coordination problem, not a character problem.

• Illinois estate attorney: reads the trust's real estate terms and explains what the trustee may do.
• Trustee: shares the reason, the appraisal or market analysis, and the plan for the proceeds.
• CPA: figures the tax cost of selling now versus later.
• Financial coordinator: shows how the sale fits Mom's care budget and the rest of the plan.

How does DAITT® help with this?

1. Trust Planning

   Put a simple rule in the family plan: no sale of the house without a written heads-up to every beneficiary.

2. Tax Strategy and Tax Filing

   Compare the tax cost of selling during Mom's life with selling after, with your CPA, before anyone signs a listing.

3. Advanced Planning

   Show how the proceeds pay for Mom's care and how long they last.

Related: what you can see of Mom's trust accounting and running your trust in Illinois.

What does selling Mom's house cost in taxes?

An illustration, not a client story. Round numbers, before selling costs and improvements. Mom bought her house years ago for $120,000. Today it would sell for $400,000. When it sells changes the tax bill far more than who sells it.

1. Mom is alive and the house is in her revocable trust

While Mom can revoke the trust, the tax law treats her as owning the house, and a sale by the trust is treated as her own sale (Treasury Regulation §1.121-1(c)(3)). Her original $120,000 basis carries over, so the gain is $280,000. If she owned the house and lived in it as her main home for at least 2 of the 5 years before the sale, and hasn't used the exclusion on another home in the 2 years before, a single filer can exclude up to $250,000 of gain (26 U.S. Code §121; IRS Publication 523). That leaves $30,000 of taxable gain. There's a special rule if Mom has moved into care. If she became physically or mentally unable to care for herself and lived in the house as her main home for at least 12 months of those 5 years, time in a licensed care facility, such as a nursing home, counts toward the 2-year use test (IRS Publication 523). If she doesn't meet the tests, up to the whole $280,000 may be taxable.

2. The house is sold after Mom passes

When Mom dies, the house's basis generally becomes its fair market value on the date of her death (26 U.S. Code §1014; IRS Publications 551 and 559). That includes property she held in a trust she could revoke during her life (26 U.S. Code §1014(b)(2)). Say a date-of-death appraisal values the house at $395,000, and the trustee sells it a few months later for $400,000. The gain is $5,000 before selling costs, which can shrink it further. The $275,000 the house grew during Mom's life isn't taxed as gain.

3. Does Illinois estate tax come into it?

Only for larger estates. The Illinois estate tax exclusion amount is $4 million (35 ILCS 405/2). If the estate's gross value, plus adjusted taxable gifts, is over $4 million, an Illinois Form 700 must be filed, whether or not a federal return is required (Illinois Attorney General). The house counts toward that total along with Mom's other assets.

Same house, same price: tax on up to $280,000 of gain, or on about $5,000. Waiting isn't always possible or right, because the house may be what pays for Mom's care. That's exactly why the timing deserves a conversation with the CPA before anyone signs a listing.

What should we do before the house is listed?

1. Ask the trustee, kindly and in writing, whether a sale is being planned, why, and at what price. Ask for the appraisal or a realtor's market analysis.
2. Get a date-of-death appraisal if Mom has passed. It sets the new basis and backs up the tax return (IRS Publication 551).
3. Keep closing and improvement records. Mom's original closing statement and receipts for improvements can raise her basis and lower the gain (IRS Publication 523).
4. Ask the CPA before listing. Compare selling now with selling later, and check whether Mom meets the ownership and use tests, including the care-facility rule.
5. Have the trustee follow Illinois notice duties. Once the trust becomes irrevocable, the trustee must generally notify each qualified beneficiary within 90 days that the trust exists, of the right to request a copy of the trust instrument, and whether they can receive accountings (760 ILCS 3/813.1). The law doesn't require advance notice of a sale (760 ILCS 3/813.1(j)), so ask for one anyway.
6. Talk to an Illinois estate attorney before any legal step, and soon if a closing date is set.

Book a Clarity Call or see your Leak Score

Related questions

Does an Illinois trustee have to tell beneficiaries before selling the house?

Not under Illinois' duty-to-inform section. 760 ILCS 3/813.1(j) says it doesn't require a trustee to inform beneficiaries in advance of transactions involving trust property. The trust document itself may require more, so an estate attorney should read it.

Can an Illinois trustee sell real estate without a court order?

Usually, yes. Unless the trust limits it, an Illinois trustee has the powers an unmarried owner has over their own property (760 ILCS 3/815) and may sell property at a public or private sale (760 ILCS 3/816). The trustee still has to act in good faith and by the trust's terms (760 ILCS 3/801).

Is there capital gains tax when a trustee sells Mom's house?

It depends on timing. Sold during Mom's life from her revocable trust, her original basis carries over, and she may exclude up to $250,000 of gain if she meets the ownership and use tests (IRS Publication 523). Sold after her death, the basis is generally the date-of-death value, so the gain is often small (IRS Publication 551).

What if the trustee buys Mom's house herself?

A trustee who sells trust property to herself has a conflict of interest. Under 760 ILCS 3/802, a beneficiary affected by that kind of sale can generally void it, unless an exception applies, such as the trust allowing it or a court approving it.

Sources

• 760 ILCS 3/815: General powers of trustee
• 760 ILCS 3/816: Specific powers of trustee
• 760 ILCS 3/813.1: Duty to inform and account
• 760 ILCS 3/603: Settlor's powers (Illinois Trust Code)
• 760 ILCS 3/802: Duty of loyalty
• 760 ILCS 3/801: Duty to administer trust
• 760 ILCS 3/1001: Remedies for breach of trust
• IRS Publication 523: Selling Your Home (including the care-facility rule)
• 26 U.S. Code §121: Exclusion of gain from sale of principal residence
• Treasury Regulation §1.121-1(c)(3): Residences owned by a trust (eCFR)
• IRS Publication 551: Basis of Assets
• IRS Publication 559: Survivors, Executors, and Administrators
• 26 U.S. Code §1014: Basis of property acquired from a decedent
• 35 ILCS 405/2: Illinois estate tax exclusion amount
• Illinois Attorney General: Form 700 estate tax return and instructions
• IRS Topic 701: Sale of your home

Who is Dr. Pat Pachciarz®?

Dr. Pat Pachciarz® is the Founder & CEO of The Pinnacle Group in Aurora, Illinois, and creator of the DAITT® Advisory Method. He is highly focused on the human connection in financial planning: how behavior and emotion shape money decisions. That focus is grounded in the Accredited Behavioral Finance Professional (ABFP®) designation he is pursuing. He is currently earning his Doctorate in Organizational Leadership at the University of St. Francis while simultaneously earning his Master's in Personal Financial Planning at the College for Financial Planning. A Certified Exit Planning Advisor (CEPA®), he coordinates each client's banker, CPA, attorneys and advisors into one clear plan.

More answers

• Do I owe taxes if I pay my daughter to care for me (or Mom)?
• Who coordinates my parent's estate attorney, CPA and advisor when I'm the caregiver?
• Does Medicare pay for Mom's long-term care at home or in a nursing home?
• Should I cut back work to care for Mom? What it costs my Social Security and retirement
• The trustee won't pay me for caring for Mom. What can I do in Illinois?
• Do I have a right to see how Mom's trust money is being spent?
• My sibling has power of attorney for Mom. Can I see her bank records?
• Caregiving for aging parents: money, taxes and protecting your own future
• Trust planning and family governance: the trust, the assets and bringing the kids in
• Inheritance taxes: do I owe money on what I got left?
• Social Security for women: retirement, spousal, survivor and divorced-spouse benefits
• Medicare at 65: when to sign up and how it fits your retirement plan
• Tax strategy and tax filing for women in transition

Also see drpat.co, running your trust in Illinois and Trust & Estate Planning at The Pinnacle Group®.