Missed the May 10 Appeal-Payment Shield? Here's Your Path Forward

The May 10 first-installment deadline for Indiana property taxes is behind us. If you filed a Form 130 appeal before May 10, you got the benefit of the appeal-payment protection — paying only the prior year's tax bill while your appeal works through PTABOA and (potentially) the Indiana Board of Tax Review. We covered that scenario in the May 10 protection post.

If you didn't file by May 10, you've already paid the first installment based on your 2026 AV — even if you intend to appeal. That doesn't end your appeal rights, and it doesn't even end your ability to recover what you've paid. But the playbook is different, and the timeline matters.

This post walks through what's still available, what's foreclosed, and the concrete steps for an Indiana taxpayer in this position.

What the May 10 deadline actually did

Indiana law (IC 6-1.1-15) provides that if you have a property tax appeal pending when an installment is due, you may pay based on the prior year's AV until the appeal is resolved. The mechanic protects you from paying tax on inflated AVs you're contesting.

Two conditions matter:

The appeal must be filed before the installment due date. Filing on May 12 doesn't help you with the May 10 installment.
The appeal must be a real Form 130, not a verbal complaint. A phone call to the assessor's office does not start the clock; only a filed Form 130 does.

If you didn't file before May 10, you didn't qualify for protection. You paid your installment based on 2026 AV. The question is what comes next.

What you can still do

The May 10 deadline is not the appeal deadline. The appeal deadline for most Indiana counties is 45 days after the Form 11 notice, which for many parcels means mid-June 2026. The May 10 deadline is specifically the payment-protection deadline, and even that has follow-on options.

Option 1: File your Form 130 now for the second installment

If you haven't filed a Form 130 yet and you're within the 45-day window from your Form 11 notice:

File immediately. The November 10 second installment is approximately six months away.
Your filed appeal protects the November installment. Even though you paid the May installment in full, the same statutory protection applies to the November installment if your appeal is pending.
Your May payment is preserved. If the appeal succeeds in reducing your AV, you can recover the overpayment through a refund process (Option 3 below).

The earlier you file in the post-May-10 window, the better — both because hearings move faster with earlier filings and because the longer your appeal is pending before November, the lower the chance of November-installment issues.

Option 2: File for second-installment protection if you're already in the system

If you filed a Form 130 between May 10 and now:

Your appeal protects you against the November installment regardless of when it was filed
You don't need a separate filing for November protection; the same Form 130 covers both installments
Make sure your county auditor's office has your filed Form 130 in their system before November

Option 3: File a refund claim under IC 6-1.1-26

If your appeal succeeds and your AV is reduced, you can recover the overpayment from the May 10 installment via a Form 17T refund claim filed with the county auditor.

The mechanics:

PTABOA or IBTR issues a decision reducing your AV
County auditor recalculates what you should have paid based on the reduced AV
You file Form 17T with the auditor requesting the refund of the difference
The auditor issues the refund within several weeks (varies by county)

Refunds are paid in cash or as a credit applied to the next installment. Most owners take the cash refund. Interest is paid on the refund at the statutory rate from the date of overpayment to the date of refund.

Option 4: If you missed the 45-day appeal window entirely

If you haven't filed an appeal and you're past the 45-day window from your Form 11 notice:

You cannot file a Form 130 for the 2026 cycle. The deadline is statutory and missed.
You can still file a Form 133 correction request if your dispute is a factual error on the property record card (square footage, classification, etc.) — Form 133 is the post-deadline route for factual corrections.
You can file a Form 130 for the 2027 cycle when Form 11 notices mail in spring 2027. The 2027 cycle is your next opportunity.

Form 133 is the most-overlooked option for taxpayers who missed the Form 130 window. If your real issue is a factual error rather than a valuation disagreement, Form 133 is filed with the county assessor and can result in mid-cycle corrections, including refunds for prior overpaid years (limited statutory window applies).

Worked example: a Marion County homeowner who missed May 10

A Marion County homeowner received their Form 11 on April 28 showing a $310K AV (up from $260K in 2025). They thought about appealing in early May but didn't get to it. May 10 came; they paid their $1,650 first installment.

On May 18 they realize they should have filed. What can they do?

Date	Action	Result
May 19, 2026	File Form 130 (still within 45 days of Apr 28 Form 11)	Appeal docketed
June–August 2026	Informal conference with Center Township	Settled at $275K AV
September 2026	Stipulation filed; appeal closed	Marion auditor recalculates
November 10, 2026	Second installment due; auditor recalculates based on $275K AV instead of $310K	Lower November bill
December 2026	File Form 17T claim for May overpayment recovery	Refund issued for the difference between May payment at $310K and what would have been owed at $275K

The homeowner is mostly made whole. They lost the use of the cash from May–December (a small interest cost) but recovered the principal and earned statutory interest on the refund.

Tip

The takeaway: missing May 10 isn't fatal. Filing now still protects the November installment and preserves your ability to recover the May overpayment through a refund claim. The bigger risk is missing the June 15 Form 130 deadline entirely — at which point you have no appeal for the 2026 cycle at all.

What's actually foreclosed by missing May 10

To be clear on what's not recoverable:

The use of cash from May to November. You paid an installment you would not have had to pay (in part) if your appeal had been on file by May 10. You recover the principal but you don't recover the time value.
Some interest accruals. Statutory interest on refunds is the rate set by Indiana, not a market rate. In high-interest-rate environments, the spread matters.

Compared to the value of a successful appeal, these costs are minor. The main risk of missing May 10 is procedural complexity, not lost dollars.

Common mistakes after missing May 10

Assuming the appeal window also closed. It didn't. Appeal deadline is 45 days from your Form 11 notice, not May 10.
Filing a Form 17T before the appeal is decided. The refund claim depends on the appeal outcome. File the appeal first; file the refund claim after the AV is reduced.
Not pre-filing the Form 130 with November in mind. If your appeal is filed in early September, you may not have a docketed hearing or stipulation by November — at which point you should still pay the second installment based on the new AV you expect (with the appeal protecting from penalty/interest).
Skipping the informal conference. Even after the deadline pressure, the informal conference with the township assessor is still the fastest path to resolution.

What to do this week

Check your Form 11 mailing date. Add 45 days. That's your real Form 130 deadline. Most Indiana counties' deadlines are in the first or second week of June 2026.
If you haven't filed, file your Form 130 with your county assessor's office today, not next week. Use certified mail or the county portal.
If you missed the 45-day window, evaluate whether your case is a Form 133 factual-correction filing instead.
Calendar the informal conference for 30–60 days after filing.
Plan for the November 10 installment with your expected appeal outcome in mind.