Provide exemption for certain modifications to residential property
Summary
HB 412 creates a property tax exemption for certain modifications to class four residential property, which generally includes owner-occupied homes and other residential property in Montana’s property tax classification system. The exemption applies when a homeowner adds living space to an existing residential structure, including enlarging finished area or altering the structure or form of existing space. The exempt amount is the lesser of the increase in market value caused by the modification or 15% of the property’s prior-year market value.
The bill includes several limits on eligibility. No exemption is allowed for a modification made within three years of construction of a new class four residence, only one modification exemption may be granted within any six-year period, and the exemption ends when the property is sold. The Department of Revenue would automatically apply the exemption beginning in the first tax year the modification is reflected in market value, and the department must administer the program within existing resources. The bill would apply to property tax years beginning after December 31, 2025.
Impact
HB 412 would amend Montana property tax law by adding a new exemption within Title 15, chapter 6, part 2 for qualifying residential improvements. In practical terms, it would reduce taxable market value for certain home additions and remodels on class four residential property, limiting property tax increases tied to those improvements. The Department of Revenue would be responsible for implementing the exemption automatically, without additional appropriations or staffing, and the exemption would only affect tax years after 2025.
Sentiment
The available voting history suggests the bill did not advance, despite no recorded opposition in the committee vote shown. On February 19, 2025, the House Taxation Committee voted 21-0 to table the bill, indicating unanimous procedural support for setting it aside rather than moving it forward. With no committee transcript provided, there is no direct record of debate, but the vote outcome suggests the proposal was not favored for advancement in its introduced form.
Contention
The main policy tension in HB 412 is between providing tax relief for homeowners who improve their residences and limiting the resulting erosion of the property tax base. Supporters would likely view the bill as encouraging home improvements and preventing tax increases from penalizing additions to existing homes, while opponents or skeptics may have been concerned about revenue impacts, administrative complexity, or the fairness of exempting some property value increases but not others. The bill’s limits—such as the 15% cap, the three-year restriction after new construction, the six-year waiting period, and termination upon sale—appear designed to address those concerns, but the unanimous tabling vote shows the proposal still faced enough institutional hesitation to stop it in committee.