“Colorado’s battery tax credit ends after 2026 — what’s the real deadline?”

The credit is 10% of the purchase price of the storage system, where purchase price means the equipment plus the sales tax and freight on it. Installation labor and permit fees don’t count. So on a Powerwall 3 we install for about $19,000, the credit is 10% of the equipment portion, not 10% of the whole invoice — meaning less than $1,900. Ask for an invoice that separates equipment from labor.

Residential batteries are also exempt from Colorado state sales tax (C.R.S. 39-26-733) through the end of 2032, so there may be little or no state sales tax to include.

A nonrefundable credit can only reduce Colorado income tax you actually owe. If your Colorado tax liability is small, you may not be able to use the full amount; ask your tax preparer how any unused portion is treated.

The statute lets a buyer assign the credit to the seller, in which case it can be refundable to the seller, typically reflected in a lower price. Not every seller accepts assignment, so ask up front and get the terms in writing.

We won’t guess at the exact event that places a purchase in tax year 2026 for your return — that’s a question for your tax preparer. The safe plan is to have the battery purchased, installed and invoiced before December 31, 2026.

Batteries need design, permits and utility paperwork. Starting in the fall leaves less margin than it seems, especially if a panel upgrade or HOA review is involved. Don’t let a year-end rush push you into the wrong size or brand.

The state credit is separate from utility programs. Xcel’s Renewable Battery Connect reopened in May 2026 with an upfront incentive reported at $350 per kW, capped at $5,000, stepping down as it fills, in exchange for letting Xcel dispatch the battery a limited number of times a year. Fort Collins Utilities and some co-ops have their own battery rebates. Check each program’s current rules.