How to Organize Documents for Your Illinois Estate Tax CPA Meeting

A CPA billing $350–$500 per hour for Illinois estate tax work spends a significant portion of that time on document retrieval — tracking down statements, clarifying account numbers, and reconstructing asset values — when the client arrives unprepared. An executor who arrives with organized documents pays for tax strategy, not for file management. The difference on a moderately complex Illinois estate can be $500–$1,500 in reduced billable time.

This page covers exactly which documents to gather, how to organize them, and what the six-folder system included in the Illinois Final Tax & Estate Tax Guide contains — so your first CPA meeting produces decisions rather than a document request list.

Why Illinois Estate Tax Requires More Than Typical Estate Documents

Illinois estate tax — unlike most states — involves three separate agencies and three distinct return types. A CPA preparing your returns needs documents organized around all three:

Form 700 (Illinois estate tax, filed with the Attorney General): Requires a complete asset inventory with date-of-death values, appraisals for real estate and business interests, a copy of any federal Form 706, all debt documentation, and proof of claimed deductions.

IL-1040 (final income tax, filed with IDOR): Requires the decedent's W-2s, 1099s, and other income statements for the year of death, prior-year tax returns (for CPA reference), Social Security income records, and any medical expense documentation for the final year.

IL-1041 (fiduciary income tax, filed with IDOR): If the estate generates income after death — interest, dividends, rental income — those transactions require documentation from the estate bank account and investment accounts. The fiscal year election the CPA makes also depends on the estate's income timing.

All three require the estate's EIN, which must be obtained before the CPA can prepare any return.

The Six-Folder Document Organization System

The CPA Preparation Packet in the Illinois Final Tax & Estate Tax Guide is organized into six folders. Arrive at your first CPA meeting with these assembled.

Folder 1: Estate Identity Documents

• Death certificate (certified copy — the CPA needs this; bring at least two)
• Will (the executed original or a certified copy)
• Trust documents if a revocable trust existed
• Letters of Office (issued by the probate court; required for executor signature authority on tax returns)
• Estate EIN confirmation (SS-4 approval letter from the IRS)
• Prior-year tax returns for the decedent (last 2–3 years)

Folder 2: Gross Estate Inventory

This folder tells the CPA whether Form 700 is even required. Include:

Real estate:

• Recent property tax bills (all properties)
• Any prior appraisals
• Date-of-death appraisal if already obtained (required for Form 700; if not obtained, the CPA needs to know this so they can coordinate)
• Mortgage statements with current balance as of date of death

Financial accounts:

• Bank account statements showing balance as of the date of death
• Brokerage account statements showing all holdings and values as of the date of death (use the date-of-death account statement, or request one from the broker specifically)
• IRA and 401(k) statements showing balance as of the date of death — these are in the gross estate even though they pass outside probate
• Any savings bonds, CDs, or Treasury securities

Life insurance:

• Policy declarations for all life insurance policies owned by the decedent (ownership determines inclusion in the gross estate)
• Death benefit amounts
• Beneficiary designations

Business interests:

• Any ownership documents for closely held businesses, LLCs, partnerships
• Most recent business tax returns (Form 1120-S, 1065, or Schedule C)
• If no professional appraisal exists, note this — the CPA will identify it as needed

Other assets:

• Vehicle values (Kelly Blue Book or similar as a starting estimate; the CPA may want a more formal valuation for estate vehicles)
• Personal property of significant value (jewelry, art, collectibles)
• Outstanding loans owed to the decedent (promissory notes, family loans)

Folder 3: Deductions and Debt

The gross estate minus allowable deductions produces the taxable estate. These deductions can be the difference between owing and not owing Illinois estate tax.

• Funeral expense invoices (the total paid to the funeral home, cemetery, monument, etc.)
• Executor fee estimate or agreement (if the executor is claiming a fee, document it)
• Attorney fee invoices or estimates
• CPA fee invoice (yes — the cost of this meeting is deductible)
• Outstanding debts of the decedent: credit card statements, medical bills, car loans, personal loans — all with balances as of date of death
• Mortgage payoff amounts (distinct from the property value; the net real estate contribution to the estate is the value minus the mortgage)
• Charitable bequests in the will (copies of the relevant will provisions)
• Marital deduction documentation if assets are passing to a surviving spouse

Folder 4: Income for the Year of Death

These documents support the final IL-1040:

• All W-2s covering employment income in the year of death
• All 1099-INT, 1099-DIV, 1099-R, 1099-SSA, and 1099-MISC issued in the year of death
• Social Security benefit letter showing monthly payments
• Pension or annuity payment statements
• Any rental income records for the partial year
• Medical expense records for the year of death (these may be deductible on the final IL-1040)
• Estimated tax payments made during the year of death

Folder 5: Estate Income Post-Death

These documents support IL-1041 if it is required:

• Estate bank account statements from the account opening through the most recent date available
• Investment account statements for any accounts opened in the estate's name
• Any rental income received after death from property held in the estate
• Interest and dividend statements for accounts held by the estate during the administration period

The CPA uses these to determine whether the estate earned enough income to trigger the IL-1041 filing requirement and what fiscal year election to make.

Folder 6: Prior Planning Documents

• Prior gift tax returns (federal Form 709) if the decedent made taxable gifts above the annual exclusion in any prior year — these gifts are added to the gross estate for Form 700 purposes
• Any prior Illinois estate tax clearance letters or certificates (if this is an estate that went through prior administration)
• Trust restatements or amendments
• Any buy-sell agreements for business interests (relevant for valuation)

What Happens Without This Organization

Here is what happens when an executor arrives at a CPA meeting without organized documents: the CPA makes a list of what they need, emails it to the executor, and schedules a follow-up meeting once the documents arrive. That first meeting produces nothing. The executor spends several weeks tracking down statements and returns. The CPA reviews the documents in their own time — at billable rates. Anything unclear results in another email or call.

For a moderately complex estate near the $4 million Illinois threshold, this process adds $800–$2,000 in fees compared to arriving organized.

More importantly, the unorganized process creates risk. Documents that are never gathered mean deductions that are never claimed. An executor who cannot produce all the debt documentation may miss $50,000 in legitimate deductions that would have kept the estate below the $4 million cliff. An executor who fails to produce prior-year gift tax returns may file an inaccurate Form 700 that the AG's office audits later.

The Gross Estate Worksheet Before the Meeting

Before the first CPA meeting, run the Gross Estate Calculation Worksheet from the guide. This pre-meeting analysis:

• Forces you to locate and value every asset category
• Tells you whether Form 700 is likely required (which determines the scope of the CPA engagement)
• Identifies which assets may require professional appraisal (real estate, business interests)
• Produces an estimated total that the CPA can either validate or adjust

Arriving with a completed worksheet — even if the values are preliminary — means the CPA spends the meeting refining and finalizing rather than starting from scratch.

The Three-Agency Reality Your CPA Needs to Navigate

Make sure the CPA you engage understands the three-agency structure. Some CPAs who handle income tax returns do not prepare Illinois estate tax returns. Confirm before engaging:

1. Does the CPA prepare Form 700 (not just IL-1040 and IL-1041)?
2. Does the CPA coordinate the payment to the State Treasurer separately from the return filed with the AG?
3. Has the CPA prepared Illinois estate tax returns before, specifically near the $4 million threshold where the interrelated calculation matters most?

A CPA who handles only the income tax filings and defers the estate tax return to someone else extends the timeline and may miss coordination between filings.

Who This Is For

• Executors who have engaged or plan to engage a CPA for Illinois estate tax filings and want to minimize total fees
• Executors who are not sure whether Form 700 is required and want to arrive at the first CPA meeting with enough information to get a definitive answer in that meeting
• Co-executors or family members who are helping an executor gather documents
• Beneficiaries who are concerned the estate's tax obligations are not being properly tracked

Who This Is NOT For

• Executors who have already handed off all documents to the CPA and simply want to wait for the return
• Estates where all assets are held in a trust and the corporate trustee is managing all administration — the trustee typically has their own document management process
• Executors dealing with a contested will or probate litigation that is pausing the tax filings — the document gathering process is the same once the litigation is resolved, but the timing is different

Frequently Asked Questions

What is the most important document to have before any CPA meeting on Illinois estate tax? The estate EIN. The CPA cannot prepare any return without it. Apply through the IRS before the first meeting.

Do I need an appraisal for the house before the first CPA meeting? Not necessarily — but you need to have ordered one. The CPA meeting can proceed with the appraisal in progress, as long as the real estate value is expected soon. If the estate is near the $4 million threshold, the appraisal result directly determines whether Form 700 is required, which affects the entire scope of the engagement.

Should I give the CPA the original will? No. Give the CPA a copy. The original should be filed with the probate court (mandatory in Illinois within 30 days of death) or retained in a secure location. The CPA needs the will to verify the estate's distribution plan and identify any bequests that affect the marital or charitable deduction.

My CPA says they need Form 706 for the Illinois filing. Is that right? Yes — Form 700 uses Form 706 as its base computation even for estates below the federal threshold. The CPA typically prepares a pro forma Form 706 as part of the Form 700 preparation process. This is why Illinois estate tax preparation takes longer than income tax preparation alone.

What if I cannot find all the documents before the CPA meeting? Bring what you have with a written list of what is missing and your plan to obtain it. A CPA who sees a largely complete organized packet plus a gap list can still make significant progress in the first meeting. The organized portion reduces the risk that missing items will be forgotten entirely.

Where is the CPA Preparation Packet referenced in this article? It is included as one of the 8 standalone printable tools in the Illinois Final Tax & Estate Tax Guide, along with the Gross Estate Calculation Worksheet, Three-Agency Filing Roadmap, Tax Deadline Calendar, and other tools designed specifically for Illinois estate tax administration.

See more Illinois guides →