Marion county tax assessor: everything homeowners need to know

Last updated 2026-07-09

What does the Marion County Assessor's Office actually do?

The Marion County Assessor values every parcel of real property in the county for tax purposes. That's roughly 350,000 parcels, from single-family homes in Speedway to commercial warehouses near the airport. The office sits inside the City-County Building in downtown Indianapolis. ^[1]

The assessor does not set your tax rate. It does not decide where the money goes. Those calls belong to the city-county council, the school boards, and other taxing units. The assessor has one job: decide what your property is worth. That single number drives every line on your bill.

Indiana law (IC 6-1.1-4) requires the assessor to value property at its "true tax value," which the state defines as market value-in-use. For most homes, the office uses a cost approach adjusted by local market multipliers. ^[2] The State Board of Accounts audits those multipliers, and the Department of Local Government Finance (DLGF) has to certify the county's assessment before any bill goes out.

Marion County reassesses on a cycle: a general reassessment every four years, with annual trending adjustments in between. The last general cycle ran for 2022 pay 2023. Annual adjustments key off the March 1 assessment date.

How does Marion County calculate your assessed value?

Indiana assessed value equals 100% of market value-in-use. It's not the old 33% fractional ratio the state used before 2002. So when your notice says the house is assessed at $280,000, that number is the office's estimate of what the house would sell for. Not a fraction of it. ^[2]

The residential process runs in three moves. The office starts with a cost table estimating what it would cost to build your home new today, using square footage, construction grade, and age. Next it applies a depreciation factor for age and condition. Then it runs a neighborhood market factor, pulled from actual sales in your area, to line the cost estimate up with what buyers are really paying.

That market factor is where most assessment errors hide. Stale sales data, thin sales data, or comps dragged in from a neighborhood that doesn't match yours all push the factor off. When the factor is wrong, your value is wrong. That's the argument that wins the most appeals.

The characteristics the office uses include gross living area, finished basement area, garage type and size, bathroom count, HVAC type, and lot size. You can see exactly what the assessor has on file for your parcel through the Marion County online property card portal. ^[1] Pull that card first. An error in square footage, bedroom count, or condition grade is free money the moment you catch it.

Assessed values are set as of January 1 each year and govern the taxes you pay the following year. Your January 1, 2025 assessment drives your 2026 spring and fall installments.

What exemptions can lower your Marion County property tax bill?

Indiana offers several deductions that shave assessed value before the tax rate hits. "Deduction" is Indiana's word; most other states say exemption. These are the ones most Marion County homeowners qualify for.

Deduction	Maximum Reduction	Key Requirement
Homestead (standard)	$48,000 of AV	Primary residence, filed by Dec 31
Homestead supplement (cap)	60% of homestead AV (formula-based)	Auto-applies with standard
Mortgage / Installment contract	$3,000 of AV	Mortgage on the property
Supplemental Homestead	Up to 35% of remaining AV	Automatic with homestead
Over-65 (income-limited)	$14,000 of AV	Age 65+, income under $30,000, AV under $240,000 [3]
Blind or Disabled	$12,480 of AV	Documented disability
Veteran (partial service disability)	$24,960 of AV	10%-99% VA disability rating
Veteran (total disability)	Full exemption	100% VA disability rating [3]

The homestead deduction is the one almost every homeowner should have and the one new buyers miss most. You file it once. It stays on your parcel until you sell or move out. If you bought in the last two or three years and never filed, you're overpaying right now. File Form HC10 with the Marion County Auditor (not the Assessor) by December 31 of the year you want it to apply. ^[3]

The over-65 circuit breaker is a separate benefit from the over-65 deduction. Indiana Code 6-1.1-20.6 caps property taxes at 1% of assessed value for homestead property and 2% for other residential. Those caps are automatic; you don't file for them. If your bill blows past those percentages, something is broken and you should call the assessor.

One more deduction worth knowing: geothermal or solar. Add solar panels or a geothermal system, and that improvement may qualify for a partial exclusion from assessed value under IC 6-1.1-12-34. File Form SES with the auditor.

What are the Marion County appeal deadlines and how do you file?

Miss the deadline and your appeal dies. Full stop.

Indiana gives you 45 days from the date on your Form 11 (Notice of Assessment) to file a petition for review. ^[4] Form 11 notices usually mail in late spring, around April or May, which puts most Marion County deadlines in June or July. The exact date is printed on your Form 11, so read the notice. Don't trust a calendar you found online.

The petition is Form 130 (Taxpayer's Notice to Initiate an Appeal), available on the Indiana DLGF website. ^[4] You file it with the Marion County Property Tax Assessment Board of Appeals (PTABOA), which the Assessor's Office administers here. Hand-deliver it, mail it (postmark counts), or file it electronically where that's offered.

There's a second, quieter appeal path. Indiana Code 6-1.1-15-1.1 lets you file a Form 133 to correct an error in the assessment record itself, separate from a valuation fight. If the assessor has your square footage wrong, a Form 133 can fix it without a full hearing.

After the Form 130 lands, the PTABOA schedules a hearing. Marion County's board tends to run 60 to 180 days out, depending on backlog. You'll get written notice of the date. Bring your evidence: comparable sales, your own appraisal if you have one, photos, or a corrected property record card.

If the PTABOA rules against you, you have 45 days to appeal to the Indiana Board of Tax Review (IBTR). From there, you can appeal to Tax Court. Most homeowners stop at PTABOA unless the dollars are large.

How do you find your property record card and look up sales comps?

Your property record card (the PRC, or property card) is the assessor's internal file on your home. It lists square footage, year built, condition grade, construction type, outbuildings, and every other characteristic used to value you. In Marion County you pull it through the county portal at indy.gov, under the Assessor section. ^[1]

Get this card before you do anything else. My rough estimate is that 10% to 20% of residential PRCs carry at least one measurable error, though nobody has published a rigorous Marion County study to nail that number down. The usual suspects: square footage pulled from an old permit that never matched the final build, a finished basement counted as unfinished (or the reverse), a phantom half-bath, and a condition grade that hasn't been touched since the last inspection.

For comps, Indiana assessors use sales from a defined study period, usually the 12 to 18 months before the January 1 assessment date. You can find those sales yourself through the Marion County Assessor's online sales search tool, or through free sources like Zillow's recent-sold filter or the DLGF's public data files. ^[4]

A good comp is a home that sold at arm's length (no foreclosure, no sale between relatives) within about half a mile of yours, within six months of the assessment date, with similar square footage, age, lot size, and condition. Find three to five where the sale price sits well below your assessed value, and you have a real case.

The ratio of your assessed value to those sale prices is what the PTABOA studies. If your AV is $320,000 and comparable homes sold for $270,000 to $290,000, you're standing on solid ground for a $30,000 to $50,000 cut.

What is the Marion County property tax appeal process step by step?

Here's the sequence, plain and simple.

Step 1: Pull your property record card from the Marion County Assessor portal and check every field for errors. ^[1]

Step 2: Find three to five comparable recent sales where the adjusted sale price falls below your assessed value. Document each one with a printout showing address, sale date, sale price, and key characteristics.

Step 3: Decide your target value. What is the property actually worth based on the comps? Don't lowball. Ask for what the evidence supports.

Step 4: Complete Indiana Form 130. List your parcel number, your current assessment, your proposed assessment, and the grounds for appeal. No attorney required.

Step 5: File Form 130 with the Marion County PTABOA within 45 days of your Form 11 notice. ^[4] Keep a copy, and get a date-stamped receipt if you file in person.

Step 6: Build your hearing packet. One page summarizing your argument, a comp grid showing each sale against your property, and photos of any condition problems. Keep it simple and factual.

Step 7: Attend the PTABOA hearing. You present first. The assessor's representative responds. Board members ask questions. The whole thing usually runs 15 to 30 minutes.

Step 8: Wait for the written decision, which the board must issue within 120 days of your hearing under IC 6-1.1-15-4. ^[2] Win, and the reduction flows into next year's bill automatically. Lose, and you decide whether the IBTR is worth the effort.

Homeowners who bring a clean, evidence-based packet win far more often than people expect. The TaxFightBack DIY appeal kit walks you through building exactly that packet, so you keep 100% of any reduction and pay no contingency fee.

How do Marion County assessments compare to neighboring Indiana counties?

Marion County is the most urban county in Indiana, so its assessed values and tax rates read differently from the surrounding doughnut counties. Here's a rough comparison of median assessed values and effective residential tax rates using the most recent DLGF data. ^[5]

County	Approx. Median AV (2023 pay 2024)	Effective Rate (approx.)
Marion County	$190,000	0.85%-1.10%
Hamilton County	$320,000	0.65%-0.80%
Hendricks County	$240,000	0.70%-0.85%
Johnson County	$210,000	0.75%-0.90%
Hancock County	$200,000	0.72%-0.88%

These are broad ranges. Your township inside Marion County matters a lot. Center Township, which covers downtown Indianapolis, usually carries higher rates than Pike or Perry. The Marion County Auditor publishes certified tax rates by taxing district each spring, and you can look up your district's rate on the auditor's site. ^[6]

Comparing Marion County, Indiana to Marion County assessors in other states is comparing different games. Marion County, Oregon runs its own county assessor office out of Salem under Oregon Revised Statutes Chapter 308, with a different assessment ratio and appeal timeline than Indiana. ^[7] Washington County, Oregon's assessor (in Hillsboro) follows the same Oregon statutes, but appeals there run through the county board of property tax appeals (BOPTA) and, if needed, the Oregon Tax Court. ^[8] Different states, different rules.

How does Newton County's assessor system compare to Marion County's?

Newton County, Indiana (northwest of Marion County) runs on the same Indiana framework under IC 6-1.1-4, with the same Form 11 notice and the same 45-day appeal window. ^[2] What changes is scale. Newton County has roughly 4,500 parcels against Marion County's 350,000, so its assessor works with a much smaller staff and handles appeals more informally.

If you own property near the Newton and Marion line, know that each county's PTABOA is its own body. You file where the land sits, not where you live.

Newton County's assessed values run lower in raw dollars because home and land values in Rensselaer, the county seat, sit well below Indianapolis metro levels. The methodology, the available exemptions, and the appeal process are identical at the state level.

Landed here from a Georgia search? The process there is a different animal. Georgia assessors like the Gwinnett County Tax Assessor or the Bibb County Tax Assessor work under Georgia Code Title 48, with different notice forms, a different appeal window (usually 45 days from the notice of assessment), and county boards of equalization instead of Indiana-style PTABOAs.

What if you disagree with the PTABOA decision in Marion County?

A loss at the PTABOA is not the end. Indiana gives you two more levels of review.

First, the Indiana Board of Tax Review (IBTR). You have 45 days from the date the PTABOA mails its written determination to file a petition. ^[9] The IBTR is a state administrative body with trained hearing officers who know property tax law cold. You still don't need an attorney, but the proceedings are more formal. Expect a prehearing conference, then a hearing, then a written final determination.

Second, if the IBTR also goes against you, you can appeal to the Indiana Tax Court within 30 days of the IBTR final determination. That's a judicial proceeding. At that point, hiring an attorney who specializes in Indiana property tax starts to pencil out, but only if the reduction you're chasing is big enough to cover the legal fees.

For most homeowners the math is blunt. Say your AV is $300,000 and you think it should be $250,000. You're fighting over a $50,000 difference. At a 1% effective rate, that's $500 a year. A PTABOA win gets you that $500. The IBTR costs you time but no filing fee. Tax Court almost certainly costs more in legal fees than you'd ever recover on a $500-a-year dispute.

The math flips when your property is commercial, assessed in the millions, or hit by a systematic error that spans multiple years. The Madison County Tax Assessor guide and the Coweta County Tax Assessor guide show how other county appeal ladders work for comparison.

How do you contact the Marion County Assessor and access records?

The Marion County Assessor's Office is at the City-County Building, 200 E. Washington Street, Indianapolis, Indiana 46204. ^[1] Phone: (317) 327-4907. Open Monday through Friday, standard county hours.

Online, you get property cards, sales data, and assessment notices through the county portal at indy.gov. The assessor's section lets you search by parcel number, address, or owner name. You can download PDFs of property record cards, which is exactly what you want in hand before filing a Form 130.

Form 130, Form 133, and Form HC10 all live on the Indiana DLGF website (in.gov/dlgf), the cleanest single source for the official forms you'll need. ^[4]

Questions about exemption status (did my homestead deduction actually get filed?) go to the Marion County Auditor's Office at the same address, not the assessor. The auditor handles deductions; the assessor handles valuations. People call the wrong office all the time and walk away frustrated.

Tax payment questions belong to a third office, the Marion County Treasurer. Indiana splits these functions by statute. Assessor: values. Auditor: exemptions and deductions. Treasurer: bills and payments.

Are Marion County commercial property appeals different from residential?

Yes, in a few ways that matter.

For commercial property, the income approach (capitalizing net operating income into a value) usually beats the cost approach, and Indiana assessors are directed by state guidance to consider income data you provide. ^[2] Own an apartment complex, office building, or retail strip in Marion County? You can submit actual rent rolls, vacancy figures, and expense statements as appeal evidence. The assessor is supposed to use that data.

Commercial assessments here also run larger in dollars, which makes professional help more cost-effective. The procedural steps stay identical: Form 11 notice, 45-day Form 130 deadline, PTABOA hearing, optional IBTR appeal.

One commercial warning. The property tax caps work differently for non-homestead property. Commercial property is capped at 3% of assessed value, against 1% for homestead. ^[3] If your commercial bill runs past 3% of your AV, that's a billing error worth disputing with the auditor directly.

For how commercial appeals play out in much larger markets, the Los Angeles County Property Tax and Cook County Tax Assessor Tax Bill guides cover income-approach appeals where commercial values run into the tens of millions.

What mistakes do Marion County homeowners make that cost them money?

Missing the 45-day deadline is the costliest mistake, and there's no recovery from it. Form 11 lands in April, you file Form 130 on day 46, the PTABOA dismisses your petition. Done.

The second costliest mistake is assuming the assessment is right because the house "seems worth that much." Your gut sense of value and the assessor's job are two different things. The question isn't whether your house is worth $300,000. It's whether the assessor's methodology, data, and property record are all correct. Those are far easier to attack.

Skipping the property record card is a close third. Every year, Marion County homeowners pay tax on square footage they don't have, bathrooms that were never built, and condition grades that ignore a house needing a new roof. You won't catch any of it without pulling the card.

Filing with no evidence is another common miss. Walk into a PTABOA hearing and say "I just think it's too high," and you lose. Walk in with three printed comp sheets, your property card with errors circled, and a one-page written summary, and you win, or at least draw a real settlement offer from the assessor's representative before the hearing even starts.

And people treat the homestead deduction as automatic. It is not. Buy a home in Marion County, get no reminder to file Form HC10 by the deadline, and you may have been paying without the deduction for years. You can file retroactively for up to three prior years under IC 6-1.1-12-41. ^[3] That's real money. Check your property card and see whether "homestead" shows up in the deduction list.

Frequently asked questions

What is the Marion County Assessor's phone number and address?

The Marion County Assessor's Office is at 200 E. Washington Street, City-County Building, Indianapolis, IN 46204. Phone: (317) 327-4907. Office hours are Monday through Friday during standard county business hours. For exemptions and deductions, contact the Marion County Auditor at the same address; for tax payments, contact the Marion County Treasurer.

How long do I have to appeal my Marion County property tax assessment?

You have 45 days from the date printed on your Form 11 (Notice of Assessment) to file a Form 130 petition with the Marion County PTABOA. That deadline is firm under Indiana Code 6-1.1-15-1. Most Form 11 notices mail in April or May, so the window typically closes in June or July. Check your specific notice for the exact date.

How do I file a homestead exemption in Marion County Indiana?

File Form HC10 with the Marion County Auditor's Office by December 31 of the tax year you want the deduction to apply. The property must be your primary residence. The standard homestead deduction reduces assessed value by up to $48,000. You only file once; the deduction carries forward until you sell or stop using the property as your primary home.

Can I appeal my Marion County assessment without a lawyer or tax agent?

Yes. Indiana's PTABOA process is built for self-represented taxpayers. You need a completed Form 130, filed within 45 days of your Form 11. Bring comparable sales, your property record card, and photos if condition is an issue. Most homeowners who prepare a basic evidence packet and show up to their hearing get at least a partial reduction without paying any professional fees.

What are the property tax caps in Marion County Indiana?

Indiana's Circuit Breaker (IC 6-1.1-20.6) caps property taxes at 1% of assessed value for homestead property and 2% for residential non-homestead. Commercial and industrial property is capped at 3% of assessed value. These caps are automatic; you don't apply for them. If your bill exceeds these percentages of your assessed value, contact the Marion County Auditor to investigate.

What is the difference between the Marion County Assessor, Auditor, and Treasurer?

The Assessor determines your property's assessed value. The Auditor applies exemptions and deductions and calculates the taxable value. The Treasurer sends the tax bill and collects payment. Appeals about value go to the Assessor (via Form 130 to the PTABOA). Questions about exemptions go to the Auditor. Questions about paying or a lien go to the Treasurer.

How does the Marion County Oregon tax assessor differ from Marion County Indiana?

Marion County, Oregon's assessor office is in Salem and operates under Oregon Revised Statutes Chapter 308. Oregon uses a maximum assessed value (MAV) system that limits annual assessment increases to 3% regardless of market changes, which is very different from Indiana's market value-in-use approach. Appeals in Oregon go through the county Board of Property Tax Appeals (BOPTA), not Indiana's PTABOA structure.

What is the Washington County Oregon tax assessor process for appeals?

Washington County, Oregon's assessor is based in Hillsboro. Like Marion County, Oregon, Washington County follows ORS Chapter 308 and the 3% MAV cap system. Appeals go to the county BOPTA; the petition deadline is December 31 of the tax year. Washington County's appeal process, timelines, and forms are entirely separate from any Indiana county system.

What is the over-65 property tax deduction in Marion County Indiana?

Indiana's over-65 deduction reduces assessed value by up to $14,000. To qualify, you must be 65 or older, the property must be your primary residence, your adjusted gross income must be under $30,000 (individual) or $40,000 (married), and your property's assessed value must be under $240,000. File with the Marion County Auditor by December 31 of the applicable year.

How do I find comparable sales to use in a Marion County tax appeal?

Start with the Marion County Assessor's online sales search at indy.gov. Look for arm's-length sales (not foreclosures or related-party transfers) within roughly half a mile of your property, sold within 12 to 18 months before January 1 of the assessment year, with similar size, age, and condition. Three to five good comps with sale prices materially below your assessed value form a strong appeal basis.

What happens after I win a Marion County property tax appeal?

If the PTABOA or IBTR reduces your assessed value, the Marion County Auditor recalculates your tax bill using the lower value. If you've already paid based on the higher value, you'll receive a refund or a credit toward your next installment. The corrected assessment applies going forward until the next reassessment, but you may need to appeal again after the next general reassessment cycle.

Can I get a retroactive homestead deduction in Marion County if I missed it?

Yes. Indiana Code 6-1.1-12-41 allows you to apply for the homestead deduction retroactively for up to three prior years. File Form HC10 with the Marion County Auditor and include documentation that the property was your primary residence during those years. If approved, you'll receive a refund or credit for the taxes you overpaid during that period.

How do I look up my property record card in Marion County Indiana?

Go to the Marion County Assessor section at indy.gov and use the property search tool. Search by your parcel number (on your tax bill) or by address. The property record card lists all the characteristics the assessor used to value your home, including square footage, condition grade, and outbuildings. Download and review it carefully for errors before filing any appeal.

What is the Newton County Indiana assessor process, and is it the same as Marion County's?

Newton County, Indiana uses the same state assessment framework as Marion County: Form 11 notices, a 45-day appeal window using Form 130, and a county PTABOA hearing process under Indiana Code 6-1.1. The main differences are scale (Newton County is much smaller) and typical assessed values, which run lower. The exemptions, appeal forms, and procedural steps are identical at the state level.

Sources

1. Marion County Assessor's Office, City of Indianapolis (indy.gov): Marion County Assessor is responsible for valuing parcels in the county; property record cards and sales search are available online through the county portal.
2. Indiana Code Title 6, Article 1.1 (Indiana General Assembly, iga.in.gov): IC 6-1.1-4 requires property to be valued at true tax value (market value-in-use); PTABOA must issue a written decision within 120 days under IC 6-1.1-15-4; income approach considered for commercial property.
3. Indiana Department of Local Government Finance, Deductions and Exemptions guide (in.gov/dlgf): Homestead deduction reduces AV by up to $48,000; over-65 deduction up to $14,000 with income and AV limits; 100% disabled veteran receives full exemption; circuit breaker caps at 1% homestead, 2% residential non-homestead, 3% commercial; retroactive homestead filing under IC 6-1.1-12-41.
4. Indiana DLGF, Forms and Petitions (in.gov/dlgf): Form 130 must be filed within 45 days of the Form 11 notice date; Form 133 corrects assessment record errors; official appeal forms and public sales data available on the DLGF site.
5. Indiana Department of Local Government Finance, Annual Report Data (in.gov/dlgf): Approximate median assessed values and effective tax rate ranges by county used in the comparison table for Marion, Hamilton, Hendricks, Johnson, and Hancock counties.
6. Marion County Auditor's Office, Certified Tax Rates (indy.gov): Marion County Auditor publishes certified tax rates by taxing district each spring; effective rates vary by township within Marion County.
7. Oregon Revised Statutes Chapter 308, Property Assessment (Oregon Legislature, oregonlegislature.gov): Marion County Oregon assessor operates under ORS Chapter 308; Oregon uses a maximum assessed value (MAV) system limiting annual increases to 3%; appeals go through county BOPTA.
8. Washington County Oregon Assessor's Office (co.washington.or.us): Washington County Oregon assessor is based in Hillsboro and follows Oregon's ORS Chapter 308 MAV system; BOPTA petition deadline is December 31 of the tax year.
9. Indiana Board of Tax Review, About the IBTR (in.gov/ibtr): Homeowners may appeal PTABOA decisions to the IBTR within 45 days; IBTR issues formal written final determinations; further appeal goes to Indiana Tax Court within 30 days.