Marion County's spring installment was due May 11, 2026 (May 10 fell on a Sunday this year). If that date came and went without your payment, take a breath: missing one installment is a fixable problem with a known cost, not an emergency. But the cost is time-sensitive — Indiana's penalty statute has a 30-day grace structure, and for the May 11 due date that window closes June 10, 2026, which is today.
This is a guide to late payment, full stop. If you're looking for the appeal-related "missed May 10" rules — what happens to your bill while an assessment appeal is pending — that's a different topic covered in our appeal-payment protection post. This post is for owners who simply didn't pay, whether by oversight, cash crunch, or an escrow servicer's mistake.
The penalty math: 5% or 10%, and the clock decides
Indiana's delinquency penalty is set by statute — IC 6-1.1-37-10 — and it has exactly two tiers:
- 5% of the delinquent amount if you pay the installment in full within 30 days of the due date and the parcel has no prior delinquencies from earlier installments.
- 10% of the delinquent amount otherwise — meaning you either paid after the 30-day window, or you carried an older unpaid balance on the parcel when this installment came due.
Two things worth understanding about how this works in practice:
- The penalty applies to the delinquent installment, not the full year. If your spring installment was $1,400 and you pay within the window, the penalty is $70. After the window (or with a prior delinquency), it's $140.
- It's a flat penalty, not a running interest meter. The 10% doesn't compound daily. But delinquencies that survive into future installment dates pick up an additional 10% on whatever remains unpaid as each subsequent due date passes — so a balance you ignore gets meaningfully worse twice a year.
Warning
The 5% tier requires a clean parcel history. If you still owe anything from a prior installment, paying the May 11 amount quickly does not get you the reduced penalty — the statute reserves the 5% rate for parcels with no prior delinquency. Pull your full balance before paying so you clear everything at once.
Step 1: Find out exactly what you owe — today's number, not the bill's
Your printed bill shows the installment amount, not the installment-plus-penalty that now applies. Get the current payoff:
- Online: look up your bill through indy.gov's property tax payment portal; the balance shown reflects assessed penalties.
- Phone: Marion County Treasurer's office, 317-327-4444.
- Email: mytaxes@indy.gov.
- In person: Treasurer's office, 200 E. Washington St., Suite 1001, in the City-County Building downtown.
You can confirm the parcel number and check your parcel's assessment record through Property Lookup if you don't have the bill in hand — Marion parcel numbers are 18 digits, and a payment posted to the wrong parcel is its own headache.
Step 2: Pay it, in the cheapest workable way
The Treasurer accepts payment online (eCheck for a small flat fee; credit/debit cards cost roughly 2.5% of the payment — usually not worth it for a tax bill), by mail, by phone, or in person. Order of preference:
- eCheck online or a mailed check — lowest cost.
- In person — same cost as mail, with a stamped receipt.
- Card — only if the 2.5% fee beats your alternative (it almost never does, unless the alternative is sliding past a penalty tier).
If you can't pay the full amount, don't go silent — partial payments are accepted and reduce the base on which future penalties accrue, and the Treasurer's office can discuss payment arrangements for delinquent balances. Call 317-327-4444 and ask what arrangement options apply to your situation before the balance ages into the next penalty event. The worst strategy is waiting for a round number you never quite reach while November approaches.
Step 3: Understand how November 10 interacts
The fall installment is due November 10, 2026, and it doesn't merge with or extend your spring delinquency — they're separate obligations on separate clocks:
| Scenario at Nov 10 | What happens |
|---|---|
| Spring paid (with penalty), fall paid on time | You're current; the episode cost you the one penalty |
| Spring still unpaid, fall paid | Fall payment is on time, but the spring balance keeps its penalties and remains delinquent — and payments generally apply to the oldest charges first, so confirm with the Treasurer how a payment will be allocated |
| Both unpaid | Spring balance picks up an additional penalty as the next due date passes, and the fall installment starts its own 5%/10% clock — and note the 5% tier is now out of reach for fall, because the parcel carries a prior delinquency |
The compounding lesson: clearing the spring delinquency before November 10 doesn't just stop the spring problem — it restores your eligibility for the 5% tier if you're ever late again.
How far are you from tax-sale risk? (Further than you fear — but the clock is real)
Indiana counties sell tax liens on delinquent parcels at an annual tax sale, and Marion County's draws heavy investor attention — we covered the buyer's side in the 2026 Marion County tax sale guide. Here's the eligibility rule that matters for you, from IC 6-1.1-24-1: each year, on or before July 1, the county treasurer certifies a list of parcels with delinquent taxes from the prior year's spring installment or earlier.
Translated to your situation:
- Missing May 11, 2026 does not put you in the 2026 tax sale. The list being certified by July 1, 2026 captures delinquencies from spring 2025 and before.
- But if your spring 2026 balance is still unpaid when the treasurer certifies the list in summer 2027, your parcel becomes eligible for the 2027 tax sale.
- Once certified, a parcel comes off the list only by paying everything — delinquent taxes, penalties, and tax-sale costs — in full.
So one missed installment is roughly a year away from tax-sale exposure. That's real breathing room, but it's a deadline, not a suggestion: parcels go through tax sale every fall in Marion County over balances that started exactly this way.
The escrow-failure scenario: when your servicer missed the payment
If your mortgage escrows taxes and the May 11 payment didn't happen, the failure is usually the servicer's — a parcel number mismatch after a refinance, a servicing transfer that dropped the tax line, or a new construction parcel split the servicer never picked up. What to do:
- Confirm the miss — check the parcel balance via indy.gov or 317-327-4444 rather than relying on your mortgage statement, which may cheerfully show escrow "disbursed."
- Call the servicer immediately and open an escrow dispute. Federal servicing rules (RESPA) require servicers to make timely escrow disbursements when your account is current — and when the late payment is the servicer's error, the penalty should come out of the servicer's pocket, not your escrow balance. Ask explicitly for the servicer to pay the tax and the penalty, and get the commitment in writing.
- Watch the parcel until the payment posts. A promised disbursement that takes weeks can cross the 30-day line and double the penalty. The county doesn't care whose fault it is; the parcel either gets paid or it doesn't.
- Keep records — screenshots of the delinquent balance, call dates, the servicer's written response. If you end up out of pocket, that file is how you get made whole.
Tip
After any escrow failure, verify the November 10 payment posts on time too. Servicer errors repeat — the same broken parcel mapping that missed spring will miss fall. Two minutes on the indy.gov portal in mid-November is cheap insurance.
The bottom line
A missed spring installment in Marion County costs 5% if you act within 30 days on a clean parcel, 10% if you don't, and escalates toward tax-sale eligibility only if it survives into next summer's certification. Get the exact payoff from the Treasurer (317-327-4444), pay the cheapest way you can, clear the full delinquency before November 10, and — if a servicer caused it — make the servicer pay for it.