Marion County's Form 11 notices mailed April 28, 2026, which made June 15, 2026 the deadline to challenge your 2026 assessed value on the merits. That date has passed. If you meant to appeal and didn't, the worst thing you can do now is assume the whole 2026 cycle is a lost cause — and the second-worst thing is to assume nothing changed.
Here is exactly what closed on June 15, what remains open under Indiana's correction-of-error rules, how to file the surviving options with the right Marion County office, and how to make sure you're not reading this same post again in July 2027.
What closed on June 15
The June 15 deadline governed the subjective appeal — the argument that your assessed value is simply higher than your property's market value-in-use. Under IC 6-1.1-15-1.1, when a county mails Form 11 notices before May 1, a valuation appeal must be filed by June 15 of the assessment year. Marion County mailed April 28, so June 15, 2026 was the cutoff, and the county treats it as statutory — a Form 130 arriving now is invalid for the 2026 valuation, not merely late.
That means the classic appeal case — "my comps say $280K and the township assessor says $320K" — is closed for the January 1, 2026 assessment. The filing checklist and the post-filing timeline now apply to your neighbors who filed, not to you.
What's still open: the correction-of-error path
Indiana law keeps a second door open for objective errors — mistakes that can be proven true or false from records, without any appraisal judgment. The DLGF's appeals guidance confirms these claims may be raised for up to three years after the taxes were first due, filed on the same Form 130 (the old Form 133 was folded into it in 2017).
The qualifying categories:
| Error type | Marion County example |
|---|---|
| Assessment against the wrong person | You sold the parcel in 2024; the bill still names you |
| Deduction, credit, exemption, abatement, or tax cap wrongly approved, denied, or omitted | Homestead deduction dropped after a refinance; 1% cap applied as 2% |
| Clerical, mathematical, or typographical mistake | A transposed digit turns 1,850 sq ft into 8,150; taxes computed on the wrong AV |
| Description of the property | The record card shows a detached garage that was demolished years ago |
What does not qualify: "the value is too high." A valuation opinion is subjective by definition, and packaging it as a correction gets it dismissed. The dividing line — and the full statute mechanics, timeline math, and evidence standard — is covered in our statewide companion post, the correction-of-error deep dive.
Note
The three-year window means a correction filed in July 2026 can reach back beyond the 2026 cycle. If a clerical error or a dropped deduction has been inflating your bills for multiple years, the correction path can fix more than one of them — something the June 15 appeal never could.
How to file it in Marion County
Marion County runs objective claims through the same appeals intake as valuation appeals, and the county's objective appeal page is the starting point. Your options:
| Method | Details |
|---|---|
| Online | Submit through the objective appeal portal on indy.gov |
| In person | Any assessor's office location; get a date-stamped copy |
| Marion County Assessor, Appeals Department, 200 E. Washington St., Suite 1360, Indianapolis, IN 46204 |
If you mail, the county asks you to include a second copy of the appeal and a self-addressed stamped envelope so they can return a receipt of your filing. Do it — the receipt is your proof if the filing is ever questioned.
On the Form 130 itself, use the objective-claim section (Section III on the current form) and attach the documents that prove the error: the record card, photos, the deed, the deduction application, permit records. After filing, expect the same contact-and-conference rhythm as a regular appeal — someone from the assessor's office reaches out to discuss the claim, per the county's appeals process overview.
Deduction problems go through the auditor too
If your issue is purely a missing homestead, over-65, or veteran deduction, there is a parallel fix: the county auditor has authority to correct deduction, credit, exemption, and tax-cap errors on discovery. Filing the objective Form 130 creates the formal record, but a call to the Marion County Auditor's office can sometimes resolve a dropped deduction faster. Belt and suspenders: do both.
Keep paying while any of this happens
Nothing above pauses your bill. The November 10, 2026 fall installment is due regardless of any pending correction, and unpaid balances accrue penalties on their own track. If the correction succeeds, you recover the overpayment — the refund mechanics are the same ones covered in our missed May 10 protection post. Pay first, recover second.
Position yourself for the 2027 cycle
For a genuine valuation dispute, your next opportunity is the 2027 assessment. The playbook, starting now:
- Pull your property record card today. Every error you find is either a correction candidate now or evidence for next year. Our record card field-by-field guide shows what to check.
- Track comparable sales through December. Sales near the January 1, 2027 assessment date will be your strongest 2027 evidence.
- Watch the mail in spring 2027. Marion County's 2026 Form 11 notices mailed April 28; if the 2027 notice also mails before May 1, the statutory deadline will again be June 15, 2027.
- File early. The owners who filed by early June this year had time to fix intake mistakes. The ones who aimed at June 15 are the ones reading this post.
Warning
Set the calendar reminder now: Form 11 arrival, spring 2027, and a personal filing deadline of June 1, 2027. The June 15 deadline does not move for good intentions, and Marion County time-stamps on receipt.
Verify your parcel before you decide
Before you write off 2026, check whether your parcel actually has a correctable error — a wrong square footage, a phantom outbuilding, a dropped deduction, a miscoded cap. Verify your assessed value, record card data, and deduction status with Property Lookup; if the number itself is the problem, our tax appeal service can build the evidence file for the 2027 cycle now.