A Marion County taxpayer starts an assessment appeal by filing Indiana Form 130 with the local assessing official. The deadline must be verified from the 2026 Form 11 and current Marion County instructions. Indiana uses June 15 of the assessment year when the notice was mailed before May 1, but June 15 of the tax-statement year when the notice was mailed on or after May 1. The Department of Local Government Finance's 2026 county table lists Marion contact information but, as of this review, no county-specific mail date or deadline. It would therefore be unsafe to announce a universal Marion date. Filing initiates local review and an informal meeting; unresolved issues proceed to the Marion County Property Tax Assessment Board of Appeals. FairPath can organize a manual record but does not file Form 130 or appear at PTABOA.
Assessment context: Use Marion County's official Property Report Card application to identify the parcel and establish the factual baseline: owner, taxing district, land and improvement values, property class, neighborhood, building area, year built, grade, condition, features, and sales history. The 2026 assessment concerns true tax value for the correct assessment date and later affects a tax bill; it is not an appeal of the tax rate itself. Marion County combines Indianapolis neighborhoods with distinct housing vintages, townships, excluded cities, commercial corridors, industrial property, apartments, and suburban-style development. Township, neighborhood model, school district, property type, lot, quality, renovation, condition, and legal use can matter more than straight-line distance. Form 130 separates subjective valuation disputes from objective issues such as wrong dimensions, nonexistent improvements, ownership errors, exemptions, or clerical mistakes, so identify the claim before assembling proof.
Filing process: Download the current Form 130 from the DLGF forms page and follow Marion County's current delivery instructions. Use one form for each parcel, identify the assessment year, current land and improvement values, requested values, disputed issues, and the pertinent facts, then sign and preserve the filed version and delivery proof. A timely filing requires the assessing official to schedule a preliminary informal meeting. At that meeting, the taxpayer and assessor exchange the information supporting their positions. If they reach agreement, the result is documented for county review; if the assessor denies the requested change, the matter is forwarded to Marion County PTABOA. A PTABOA final determination can be appealed to the Indiana Board of Tax Review using Form 131 and its deadline. Do not treat a phone inquiry, property-card correction request, or unfinished form as a filed Form 130.
Evidence to review: For a subjective Marion valuation appeal, connect evidence to true tax value at the required assessment date. A sales grid should identify parcel, sale date and price, neighborhood or township, property type, living area, age, grade, lot, basement, garage, renovation, condition, and unusual transaction terms. Use the official Marion property cards for record facts and explain adjustments rather than relying on raw price per square foot. A recent arm's-length purchase, appraisal with the correct effective date, dated photographs, inspection findings, permits, and contractor estimates may help when their valuation relevance is clear. For an objective claim, highlight the exact incorrect card field and provide measurements, deeds, exemption decisions, photographs, or other source documents. Bring an indexed copy to the informal meeting and preserve what was exchanged because unresolved evidence becomes the foundation for PTABOA review.
Current deadline guidance: Verify the 2026 Form 11; deadline depends on its mailing date. Indiana's real-property rule sets June 15 of the assessment year when Form 11 is mailed before May 1; if Form 11 is mailed on or after May 1, the deadline is June 15 of the year in which the resulting tax statement is mailed. As of review, the DLGF's county table did not publish a Marion County 2026 mail date or deadline, so the parcel notice and current Assessor instructions must control.
The DLGF 2026 Form 11 table lists Marion County's assessor phone but no Marion mail date or appeal deadline, making the parcel notice essential rather than optional.
Marion provides an Indianapolis mapping application for official Property Report Cards, which should anchor parcel facts and sale history before comparisons are selected.
Indiana Form 130 consolidates subjective valuation and objective factual claims, but they occupy different parts of the form and require different evidence.
Filing triggers a preliminary informal meeting and information exchange before an unresolved Marion appeal reaches PTABOA, so the first packet should be organized for substantive review.
Official filing authority: Marion County Assessor. https://www.in.gov/dlgf/appeals-property-tax/
Source: Indiana Department of Local Government Finance, Notice of Assessment of Land and Improvements Form 11, https://www.in.gov/dlgf/understanding-your-tax-bill/notice-of-assessment-of-land-and-improvements-form-11/. Reviewed 2026-07-16.
Source: Indiana Department of Local Government Finance, Property Tax Assessment Appeals Process, https://www.in.gov/dlgf/appeals-property-tax/. Reviewed 2026-07-16.
Source: Indiana Department of Local Government Finance, DLGF Appeals Process Forms, https://www.in.gov/dlgf/forms/dlgf-forms/. Reviewed 2026-07-16.
Source: Marion County Assessor, Marion County Assessor Property Cards, https://maps.indy.gov/AssessorPropertyCards/index.html?defaultview=address. Reviewed 2026-07-16.