Can I stack the Indiana Historic Tax Credit with the federal HTC?

Yes, and the stacking math is one of the most underused tools in Indiana historic preservation finance. Indianas Residential Historic Rehabilitation Tax Credit (codified at IC 6-3.1-22) provides up to a 20% state income-tax credit on qualified rehabilitation expenses for owner-occupied homes that are listed on the National Register of Historic Places or are contributing properties within a National Register district. Eligible districts include Lockerbie Square, Old Northside, Herron-Morton Place, Fountain Square, and several others.

The federal Historic Tax Credit (HTC), administered by the National Park Service in coordination with the IRS, provides a separate 20% credit but only on certified rehabilitation of income-producing properties (rentals, mixed-use buildings, commercial conversions). For pure owner-occupied residential rehab, only the Indiana state credit applies. For owner-occupied-to-income conversions (common in Lockerbie and Herron-Morton, where original mansions are converted to legal duplexes or owner-occupied with rental units), both credits can stack.

When properly structured, certified rehabilitation expenses can earn close to 40% combined federal-plus-state credit. The qualified rehab must meet Secretary of the Interior Standards for Rehabilitation, which IHPC and the State Historic Preservation Office (Indiana DNR Division of Historic Preservation and Archaeology) review for substantial compliance. Window replacement with vinyl, removal of original features, and additions that overwhelm the historic structure all jeopardize certification.

The practical workflow: before you start, file a Part 1 application establishing the propertys historic significance, then a Part 2 application describing the proposed scope of work, and a Part 3 after completion certifying the work was done as described. Skipping Part 2 (starting work first, applying after) is the single most common reason rehabs get denied certification. Costs are tracked across the rehab, so accounting hygiene matters.

For Indianapolis Lockerbie, Herron-Morton, Old Northside, and Fountain Square owners contemplating a substantial rehab, a 30-minute call with a preservation tax-credit consultant or with IHPC staff before scoping work usually pays for itself many times over. AskBaily can point you to current SHPO contacts and recent successful Indianapolis Part 3 awards.