The 7 percent that should not be in your quote
Indiana exempts solar panels, inverters, mounting hardware and other qualifying system components from the 7 percent state sales tax.
On a residential system that is a substantial figure, and it is entirely automatic. There is no form to file and no application to make.
Because it is automatic, the only way to verify it is to look for something that is not there. Ask directly whether the quoted price includes any Indiana sales tax.
If it does, ask which component it was applied to and why. There may be a legitimate answer for an item outside the exemption, but it should be an explanation rather than a shrug, and it should be resolved before you compare quotes.
The assessment that should not rise
Indiana exempts the added value of a residential solar system from property tax assessment. Your home is worth more with solar on it and the assessment for the array does not follow.
That matters more in a place like Carmel, where property values are high enough that an assessment increase would compound meaningfully across the life of a system.
It is also the item most often omitted from a savings model, because nothing is deposited and no document arrives to mark it happening.
Ask whether your installer model accounts for it, and confirm with your county assessor what filing, if any, is required locally. Assessment procedures are administered at county level, so the paperwork question has a local answer.
Why these matter more than they used to
When the 30 percent federal residential credit existed, these two exemptions were minor items in a much larger stack. Section 25D expired for property placed in service after December 31, 2025, and Indiana has no state income tax credit for solar.
At the same time net metering closed for new customers, replaced by the Excess Distributed Generation credit at roughly 70 to 80 percent below the retail rate.
So the exemptions have gone from footnotes to being a meaningful share of what an Indiana buyer actually receives, purely because everything around them shrank.
That is an argument for confirming both explicitly rather than assuming they are handled. A quote that quietly includes sales tax, or a model that shows an assessment increase, is now a larger error relative to the total than it once was.
Building the number from what Indiana still offers
The 30 percent federal Residential Clean Energy Credit under Section 25D expired for property placed in service after December 31, 2025, so a cash or loan purchase in Carmel receives no federal tax credit, and Indiana has no state income tax credit for solar.
Section 48E survives at 30 percent for third-party owners under leases and power purchase agreements, so ask what a provider claims and what reaches you in the rate.
What exists is the 7 percent sales tax exemption, the property tax exemption on added value, full retail value for electricity consumed as it is generated, and the Excess Distributed Generation credit for exports.
Ask that both exemptions be shown explicitly in the projection rather than folded into a net figure, and confirm the county filing requirement with your assessor.