What Is Solar Exemption
A solar exemption removes the added assessed value created by installing solar panels or renewable energy systems from your property tax calculation. When you install solar, your home or commercial property becomes more valuable. Without this exemption, assessors would increase your assessed value and your tax bill would rise accordingly. The exemption prevents that tax penalty for going solar.
Most states and many counties offer some form of solar exemption, though the specifics vary widely. Some states exempt the solar system's value entirely for a set number of years (typically 10 to 20 years). Others exclude only a percentage of the improvement value. A few jurisdictions offer no exemption at all, which is why checking your local rules before installation matters.
How Assessment Increases Happen
Assessors use three main appraisal methods to value property: the sales comparison approach, the cost approach, and the income approach. For residential solar installations, the cost approach dominates. Assessors look at the installed cost of your system, apply depreciation schedules, and add the net value to your property's assessed value.
A typical residential solar system costs between $15,000 and $25,000 before incentives. If your assessor applied the cost approach without exemptions, that full or near-full amount could add to your assessed value. At a standard assessment ratio of 1.0 (100 percent of market value), this translates to a permanent tax increase. In states using lower assessment ratios like 0.5, the tax impact is halved, but you still pay annually on the improvement.
State Exemption Variations
- Full exemptions: California, Florida, Massachusetts, and New York exempt solar's added value for 15 to 25 years. Some make the exemption permanent.
- Partial exemptions: Texas exempts 100 percent of solar value for 20 years on owner-occupied homes but has stricter rules for commercial properties.
- Age-based exemptions: A few states phase out the exemption as the system ages, reducing the exemption percentage annually.
- No exemption: Some counties and states have no solar exemption. You must challenge inflated assessments through the board of review hearing process.
Claiming the Exemption
Solar exemptions are rarely automatic. You typically must file a declaration or affidavit with your assessor's office when the system is installed or when you purchase a property with solar. Deadlines vary but often align with the assessment roll date (usually January 1 in most states). Missing the deadline may forfeit the exemption for that tax year.
Provide documentation including the solar contractor's invoice, system specifications, interconnection agreements from your utility, and proof of installation. Some assessors request third-party verification or photos of the installed system.
Board of Review Challenges
If your assessor denies the exemption or ignores it, you have the right to appeal through the board of review hearing. Present comparable sales data showing that homes with similar solar systems didn't receive proportional assessment increases. If your assessed value jumped by $20,000 after a $18,000 solar installation while comparable homes with solar weren't assessed similarly, that inconsistency strengthens your case.
Bring the system's specifications, installation costs, and any depreciation schedules used by your assessor. Challenge the assessment ratio if it's inconsistently applied across your neighborhood. Request that the board reconcile the value they assigned to your solar system against its actual depreciated cost and market impact.
Common Questions
- If I lease my solar system instead of buying it, do I still qualify for the exemption? No. Most solar exemptions apply only to owned systems. Leased or power-purchase-agreement systems don't trigger the exemption because you don't own the improvement. The leasing company may claim exemptions in some cases, but the tax benefit typically flows to them, not you.
- What happens when the exemption expires? Once the exemption term ends (typically 10 to 25 years), the solar system's value becomes subject to assessment again. However, the depreciated value at that point is far lower than the original cost, so the impact is minimal. A 20-year-old system might have only 20 percent of its original value remaining.
- Can the assessor increase my home's base value because of the solar installation, then apply the exemption? This occasionally happens in poorly trained assessment offices. The exemption should apply only to the solar system's added value, not to any general market value increase your home experienced. If you see inflated base value increases alongside solar exemption claims, appeal to the board of review and request separate valuation of the solar component.