Most of what adult children need to know about Illinois estate and incapacity planning is concentrated in a small number of documents and a handful of state-specific rules — some of which diverge sharply from what they may have grown up with in another state.
The four documents to have in place this year
These are universally applicable in Illinois regardless of wealth or family structure. Most cost between $400 and $1,500 through an Illinois-licensed attorney; the trust adds $1,500–$4,000.
1. Power of Attorney for Property (755 ILCS 45/3)
An Illinois Property POA names a person (the agent) to handle your parent's financial affairs if they become unable to. Illinois provides a statutory short form under 755 ILCS 45/3-3 that has specific witness and notarization requirements: signed by your parent in front of one witness and a notary. The statutory form is widely accepted by Illinois banks; non- statutory or out-of-state forms sometimes generate friction.1
Illinois's POA Act was revised in 2011 with a major rewrite, and certain authorities — the right to make substantial gifts, to amend beneficiary designations, or to create or fund a trust — should be specifically expressed. A generic out-of-state POA may not carry these powers in Illinois, which is why an Illinois-specific document is important.
2. Power of Attorney for Health Care (755 ILCS 45/4)
Illinois treats medical decision-making separately from financial decision-making. The Health Care POA names a person to make medical decisions when your parent cannot communicate their wishes. Witness requirements differ from the Property POA: signed by your parent in front of one witness (with restrictions on who can witness — not the agent, not a relative of the agent, not the attending physician).2
3. Living Will (755 ILCS 35)
The Illinois Living Will Declaration expresses your parent's wishes about end-of-life care — specifically, whether to withhold or withdraw death-delaying procedures in defined terminal conditions. It works alongside the Health Care POA, not in place of it.
4. Revocable Living Trust
A revocable trust is the workhorse of mid-to-upper-tier Illinois estate planning. Your parent transfers assets into the trust during life, retains full control as trustee, and names a successor trustee to manage and distribute assets at death without probate. Illinois recognizes the modern trust structure through the Illinois Trust Code (760 ILCS 3). For higher-net- worth families, a properly drafted revocable trust can also accommodate IL estate-tax planning provisions.
The Illinois estate tax
Illinois is one of about a dozen states that still levy a separate state estate tax. The Illinois exemption is approximately $4 million per estate. The graduated rate begins above the exemption and can reach into the double digits at the upper brackets.3
Practical implications for caregiving:
- A paid-off house in Cook County or the collar counties plus modest retirement savings can put a family's estate at or near the $4M exemption — this is not a tax that only affects the very wealthy.
- The federal exemption (~$13.99M in 2025) does not protect you from the Illinois tax. The IL tax applies even when the federal tax does not.
- Married couples can use a combination of marital deduction planning, QTIP elections, and credit-shelter structures to functionally double the IL exemption. The planning works only if the trust is properly drafted — a generic out-of- state plan often misses this.
Probate in Illinois
Illinois probate is governed by the Probate Act of 1975 (755 ILCS 5). Three main paths:
- Small estate affidavit. For personal estates of $100,000 or less with no real estate requiring probate (755 ILCS 5/25-1). The affidavit is sworn by the heir and presented to banks and other holders to release assets.
- Independent administration. Available when the will authorizes it and heirs consent. Less court supervision; faster and cheaper than supervised administration.
- Supervised administration. The default when heirs disagree or unusual circumstances exist. More court involvement, longer timelines.
For estates exceeding $100,000 that don't pass by trust, beneficiary designation, or joint tenancy, formal probate is generally required. Attorneys' fees in Illinois are governed by reasonableness standards rather than a statutory percentage schedule — but a typical formal probate on a $500,000 estate is often $5,000–$10,000 in attorney's fees, plus court costs.4
Illinois homestead and other creditor protections
Illinois provides a homestead exemption of $15,000 per individual (or $30,000 for spouses jointly owning) under 735 ILCS 5/12-901. This is far less generous than Florida's or Texas's unlimited homestead, but provides meaningful baseline protection from most judgment creditors. The exemption is automatic for primary residences and applies during life; it doesn't protect against mortgages, property tax liens, or HOA assessments.5
No state inheritance tax
Illinois has no state inheritance tax (the estate tax is paid by the estate, not the heirs). Federal estate-tax exemption (~$13.99M in 2025) applies for federal purposes. For most Illinois families below both the federal threshold and the IL state threshold ($4M), estate planning focuses on probate avoidance, incapacity planning, and family coordination, not tax minimization.
What to do this quarter
- Locate (or create) your parent's four documents: Property POA, Health Care POA, Living Will, and (if appropriate) Revocable Living Trust.
- If documents exist but are more than 10 years old, have them reviewed — Illinois's POA Act revisions and changing IRS rules may have made earlier documents inadequate for specific purposes.
- Run a rough estate-value calculation. If you're within a few hundred thousand dollars of $4M (including the home), get an IL estate-tax planning review.
- Get an estate-plan review if the will was drafted in another state.
- For our companion content on Medicaid planning and the Illinois Community Care Program, see the Illinois Medicaid guide and the caregiver guide.