How to Appeal Property Taxes in Marion County, Indiana (2026 Guide)

For Marion County homeowners, the 2026 assessment appeal deadline was Monday, June 15, 2026. As of July 24, 2026, that window has closed for the regular 2026 real-property appeal; the next regular deadline is expected to be June 15, 2027, unless your Form 11/tax-bill notice gives a different deadline.

File with the Marion County Assessor, Appeals Department, not the Treasurer. Use the county’s online subjective/objective appeal pages, mail Form 130 to 200 E. Washington Street, Suite 1360, Indianapolis, IN 46204-3319, or file in person at an Assessor office location.

How assessments work in Marion County

Indiana values real property at 100% of market value-in-use. In plain English: the Assessor is trying to estimate what your home was worth for its current use as of the assessment date, before deductions such as homestead are applied. The value you see on the Form 11 or property record card is not your tax bill; it is the starting number used to calculate the bill.

Marion County is part of Indiana’s statewide system of annual trending plus cyclical reassessment. Annual trending means assessors review property sales in an area every year and use those sales to update values for similar properties. The current statewide cyclical reassessment cycle begins July 1, 2026 for 2026 Pay 2027 taxes and runs for four years, with assessing officials physically reviewing about 25% of parcels each year to verify data such as square footage, garages, pools, condition, and land characteristics.

This matters because many Marion County appeals are really about the data behind the model. Before arguing “my taxes are too high,” pull your Marion County property record card from the Assessor Property Cards tool and check the facts: living area, basement finish, number of baths, garage, porch, condition grade, land size, neighborhood code, and prior sales. A wrong garage or 300 extra square feet is usually a stronger appeal than a general complaint about rising taxes.

Whether you should appeal

Appeal if you can show the assessed value is higher than market value or that the record is wrong. Good homeowner evidence in Marion County includes: a recent appraisal, your own recent arm’s-length purchase price, comparable sales from your neighborhood, photos of condition problems, contractor estimates for major defects, or documents proving a data error.

Be careful with Indiana’s 1% homestead cap. The cap limits many owner-occupied homes to 1% of gross assessed value, although some referendum or cap-exempt items can still affect the bill. If your bill is already being reduced by a large circuit-breaker credit, a lower assessment may save less than the tax rate suggests. Still, a lower value can matter because it lowers the cap itself and may reduce future bills.

A realistic example using Marion County’s 2026 Indianapolis Center tax district 101 rate of 2.7291 per $100 of net assessed value: suppose a homesteaded home is assessed at $260,000, but comparable sales support $240,000. For 2025 Pay 2026, the standard homestead deduction is $48,000 and the supplemental homestead deduction is 40% of the remaining value. At $260,000, net assessed value is about $127,200. At $240,000, net assessed value is about $115,200. The $12,000 net assessed value reduction saves about $327 before cap effects ($12,000 ÷ 100 × 2.7291). If the home is capped at 1%, the cash savings may be closer to $200 because the gross assessed value cap drops from $2,600 to $2,400, subject to any cap-exempt charges and credits on the bill.

I did not find an official Marion County dashboard publishing homeowner appeal success rates or median reductions. Do not rely on mailers claiming a guaranteed reduction; decide based on your property card, comparable sales, and whether the tax cap limits your savings.

Step-by-step how to file

1. Confirm the deadline. Indiana’s rule is: if the Form 11 notice is mailed before May 1, the appeal deadline is June 15 of that assessment year. If the notice is mailed on or after May 1, the deadline is June 15 of the year the tax bill is mailed. For 2026 Marion County homeowners, use June 15, 2026 as the regular deadline; for the next cycle, check the notice but expect June 15, 2027 if notices follow the usual timing.

2. Choose subjective vs. objective. Indiana uses Form 130 — Taxpayer’s Notice to Initiate an Appeal. Page 1 is for a subjective valuation appeal, such as “my home would not sell for the assessed value.” Page 2 is for objective/factual issues, such as wrong square footage, wrong owner, omitted deduction, clerical error, or a garage that does not exist. Marion County also offers separate online filing flows for subjective appeals and objective appeals.

3. State the value you want. Do not just write “too high.” Put the current assessed value, your requested value, and the reason. Example: “Assessed at $260,000; requested value $240,000 based on three 2025 neighborhood sales of similar homes at $235,000–$242,000 and roof/foundation repairs documented in attached estimates.”

4. Attach evidence. Use a short cover page, then exhibits: property record card with errors marked, comparable sales, appraisal, photos, repair estimates, closing statement, or measurement documents. Keep copies of everything.

5. File. Filing methods to use in Marion County: online through the county’s subjective or objective appeal pages; mail to Marion County Assessor, Appeals Department, 200 E. Washington Street, Suite 1360, Indianapolis, IN 46204-3319; or in person at an Assessor office location. If mailing, use tracking and include a second copy plus a self-addressed stamped envelope if you want a stamped receipt. I found the Assessor’s general email, assessor@indy.gov, for questions, but not an official Marion County email-filing option for Form 130; use the portal, mail, or in-person filing unless the Assessor specifically confirms email filing for your case.

There is no county filing fee listed for starting a Form 130 appeal. Your cost is usually your time, copies, and optional appraisal or representative fees.

What happens after

After you file, the Assessor’s office reviews appeals in the order received and usually schedules an informal/preliminary conference. This may be a meeting or phone call with staff to go over your property record and evidence. If you and the Assessor agree, the case can end with a stipulated correction.

If there is no agreement, the case moves to the Marion County Property Tax Assessment Board of Appeals (PTABOA). PTABOA is the local appeal authority. Marion County agendas show cases grouped as Form 130 objective appeals, subjective appeal preliminary agreements, hearing-officer recommendations, and withdrawals. In practice, you present your evidence, the Assessor presents the county’s position, and a hearing officer or board members may ask questions. Treat it like a short administrative hearing, not a courtroom drama: bring organized copies and explain the numbers.

Indiana timing rules are important. If the informal results are not forwarded within 120 days, the PTABOA must hold a hearing no later than 180 days after the appeal filing. If PTABOA does not issue a determination within the required period, or if you lose, you may appeal to the Indiana Board of Tax Review (IBTR) using Form 131. IBTR also has an online system called POPLAR for state-level appeals after the county stage.

Local tips

Check deductions before appealing. For homeowners, the big one is the homestead standard/supplemental deduction. Also check Over 65 benefits, blind/disabled credit, disabled veteran benefits, rehabilitated property deductions, and any deduction that should appear on the bill. Deductions and credits are generally handled through the Marion County Auditor, not the Assessor’s valuation appeal staff.

Use Marion County’s own records against the model. The Assessor Property Cards site lets you compare nearby homes’ assessed values, characteristics, and sale histories. Best comps are close by, similar in age, size, condition, and style, and sold near the relevant valuation period. A renovated Fountain Square duplex, a Broad Ripple bungalow, and a far-east-side ranch are not interchangeable just because the square footage is similar.

Keep paying your tax bill while the appeal is pending. An assessment appeal does not pause penalties or due dates. If you win after paying, the correction is usually handled through a refund or credit process.

Finally, appeal the assessment, not the tax rate. The Assessor and PTABOA cannot lower school, library, city, township, or referendum rates. Your winning argument is: “the assessed value is wrong,” supported by evidence.