How the Marion County Property Tax Late Payment Penalty Works
The penalty clock starts the day after you're due, and it compounds fast. Here's what Indianapolis homeowners need to know about due dates, dollar consequences, and how to ask for relief.
The penalty clock starts the day after you’re due, and it compounds fast. Here’s what Indianapolis homeowners need to know about due dates, dollar consequences, and how to ask for relief.
Paying your Marion County property taxes a few days late feels like a minor slip. It isn’t. Under Indiana state law, a 5 percent penalty attaches to any unpaid installment the moment the due date passes — not after a grace period, not after a warning letter. Thirty days later, if the bill is still unpaid, a second charge hits: another 10 percent on the original amount. Within a month of missing a single payment, you’re looking at 15 percent on top of whatever you owed, and the bill has started its slow mechanical drift toward the county’s annual tax sale.
This piece covers the payment calendar, the penalty math, the tax sale timeline, and the waiver process that most homeowners don’t know exists. None of it is secret. Almost none of it is in one place.
The 2026 Due Dates — and a Calendar Trap Worth Knowing
Indiana property taxes are paid in two installments. Spring is due May 10. Fall is due November 10.
In 2026, May 10 falls on a Sunday. When a statutory deadline hits a weekend or holiday, Indiana law pushes it to the next business day — so the 2026 spring due date is Monday, May 11, not May 10. November 10 is a Tuesday, so that one stays put.
This matters because of bank auto-pay. A homeowner who sets a payment for May 10 on the assumption that’s always safe, watches it clear Sunday morning with the county closed, and assumes everything is fine — that homeowner is in an ambiguous position. “I thought it was fine” is not a waiver argument that goes anywhere. Pull the current due dates directly from the Treasurer’s office rather than from any calendar assumption you made six months ago, including this one. Call (317) 327-4444 or check indy.gov. Dates can shift based on county certification schedules.
The Penalty Math
The governing statute is Indiana Code § 6-1.1-37-10. A 5 percent penalty attaches to the unpaid installment the day after the due date. If the bill is still unpaid 30 days after that, an additional 10 percent hits — applied to the original unpaid amount, not the already-penalized balance. Total exposure: 15 percent, reached within a month.
On a $1,000 installment: $50 on day one past due, another $100 by day 30. That’s $150 in penalties on a four-figure bill. Not catastrophic. Not nothing. Scale to your actual number.
If the fall installment also goes unpaid, the same structure applies to that one separately. A homeowner behind on both faces penalties on each before any tax sale costs enter the picture. Call (317) 327-4444 to confirm whether Marion County applies any charges above the state rates.
The Tax Sale: How Far Behind Is Actually Dangerous
Missing one payment is painful. Missing two starts a legal clock that ends, if ignored long enough, with a stranger holding a claim on your home.
The relevant statutes are Indiana Code § 6-1.1-24 (the sale) and § 6-1.1-25 (redemption rights). A homeowner who misses the spring installment and then the following fall installment becomes eligible for the county’s annual tax sale. That’s the threshold. One missed payment is expensive; two in a row puts your property on a list. Marion County typically holds its sale in August or September, though the exact date varies.
Before the sale, the county must send certified notice to the property owner. If a certified letter from the Marion County Treasurer arrives at your door, open it. That day.
At the sale, investors bid on tax lien certificates for delinquent properties. They pay the outstanding taxes to the county. You now owe the investor — plus statutory interest — rather than the county. Under IC § 6-1.1-25, you have one year from the date of the tax sale certificate to redeem the property: meaning pay the back taxes, penalties, interest, and costs in full. One year is a real window. Not comfortable, but real.
If you don’t redeem within that window, the certificate holder can petition for a tax deed and take ownership. At that point, you’ve lost the house. The sequence from a single missed payment to any transfer of ownership takes years and involves multiple steps — but it is entirely mechanical. Nothing in the process requires your participation to keep moving. The point of no return is when the redemption window closes without the homeowner paying off the certificate.
If Your Taxes Are in Escrow, a Servicer Error Is Still Your Problem
A significant share of Indianapolis homeowners pay property taxes through mortgage escrow. Your servicer collects a portion of your estimated annual bill each month and is supposed to remit it to the county on time. Here’s where people get caught: servicer errors happen — missed remittances, wrong parcel numbers, misdirected payments. The penalty under Indiana law attaches to the property regardless of who sent the payment late.
Check your annual escrow analysis statement. Your servicer is required to provide one every year. It shows what was collected, what was disbursed, and when. A disbursement date after the county’s due date is documentation of a servicer error. Keep it.
When you call your servicer, ask for the date the payment was remitted to the county — not the date it was processed internally. Those aren’t always the same, and the gap is exactly where things go wrong. Get it in writing.
A waiver request to the Treasurer supported by documentation that the late payment was a servicer error carries more weight than one without it. If you ended up paying a penalty because your servicer remitted late, pursue reimbursement from them separately. That’s a different conversation from the one you have with the county, and both are worth having.
Getting the Penalty Waived
A penalty waiver is a real option, not a bureaucratic fiction. IC § 6-1.1-37-10 gives the Marion County Treasurer discretionary authority to waive penalties. “Discretionary” means the office isn’t obligated to waive yours — but it can, and Marion County has historically entertained these requests.
The grounds that actually move the needle: a first-time offense with no prior delinquency; a dated receipt or tracking number showing a mailed payment left before the due date and arrived late; documented servicer error that clearly shifts responsibility. Serious illness, job loss, or financial emergency can support a request too, though the documentation bar is higher and the outcome less predictable.
Write a letter to the Marion County Treasurer at 200 E. Washington Street, Indianapolis, IN 46204. State your name, your parcel number (it’s on your tax bill), which installment you’re disputing, the specific penalty amount you’re asking to have waived, and why. Attach whatever supports your case. Keep it short and factual — the person reviewing it has seen a lot of these, and a concise letter with solid documentation beats a long narrative every time.
Call (317) 327-4444 first to ask whether the office has a preferred format. Some counties use printed forms; others take letters. Whatever you submit, do it promptly. Waiting several months after a penalty was assessed weakens your case considerably. There’s no formal deadline for waiver requests that I’m aware of, but timeliness signals that you’re paying attention.
Paying Online: What “Submitted” Actually Means
The Treasurer’s online payment portal is accessible through indy.gov. Initiating a payment is not the same as completing one — and that distinction matters when you’re cutting it close to a deadline.
Whether an online payment is credited as “timely” depends on the county’s policy regarding settlement date versus initiation date, and that policy isn’t prominently posted anywhere I’ve found. Before you pay online near a deadline, call (317) 327-4444 and ask directly: “If I initiate an online payment today, what date will it be credited for penalty purposes?” Don’t guess.
Credit card payments carry a processing fee of roughly 2.5 percent. On a typical installment, that’s real money going to a payment processor rather than reducing your tax bill. E-check is usually free or close to it, and often the smarter choice when you’re cutting it close. Verify the current fee structure at indy.gov before completing your transaction — processors and fee amounts change.
The safest option when you’re up against a deadline is paying in person at the City-County Building. You get a time-stamped receipt. No ambiguity about what date the county received it.
Assessment Dispute versus Unpaid Bill: Two Separate Tracks
Every year, some homeowners receive their tax bills, decide the assessed value is wrong, and stop short of paying a number they’re contesting. The instinct makes sense. It’s wrong.
Disagreeing with your assessed value does not pause your obligation to pay. Marion County’s assessments are handled by nine township assessors — one per township — not by the Treasurer. If you believe your value is off, contact the appropriate township assessor and begin a formal appeal. For a full breakdown of how that bill was constructed in the first place, our coverage of how Indianapolis property taxes are calculated explains the methodology behind assessed values and the circuit breaker caps that affect your final number. That process has its own timeline and its own deadlines.
The tax bill from that contested assessment still comes due. Pay it. If your appeal succeeds and the assessment drops, the county will credit or refund the overpayment. But if you hold the payment while the appeal is pending and the appeal ultimately reduces your bill, you’ll still owe penalties on whatever you didn’t pay in the meantime. People discover this outcome every year, usually when it’s too late to undo it.
Pursue the appeal and pay the bill at the same time. They’re parallel tracks. Neither one pauses the other.
Where to Go, What to Bring, Who to Call
Marion County Treasurer’s Office City-County Building 200 E. Washington Street, Indianapolis, IN 46204 Phone: (317) 327-4444 Web: indy.gov — search “property tax” or navigate to the Treasurer section
Call ahead or check the website before you make the trip. Hours vary around holidays and budget cycles, and arriving at a closed office the afternoon before a deadline is an entirely avoidable disaster.
The City-County Building is downtown. Parking is paid. Budget extra time on weekday afternoons.
Paying in person: bring your tax bill or parcel number and a form of payment — check, money order, cash, or card. For a penalty waiver request, bring your letter, all supporting documentation, and a copy of everything for your own records. If you’re contesting a penalty on a mailed payment, bring the postmarked envelope. For an escrow error, bring the servicer documentation.
Paying online: have your parcel number and banking or card information ready. Pay well before the deadline, not on it, and confirm with the Treasurer’s office what date your payment will be credited. If you’re navigating the broader landscape of tax deadlines, exemptions, and assessment appeals, our legal & finance coverage tracks the issues Indianapolis property owners run into most often.
The penalty structure is steep, the tax sale timeline is methodical, and the waiver process works — but only if you move quickly and come with documentation. That’s it.
