Can I still get a tax credit for a home improvement installed 2 years ago that I failed to apply for?

If you did not claim a qualifying tax credit in a prior year, you may be able to file an amended tax return for the year's return in which you made the improvement. However, you cannot claim it on your current tax return. For example, you cannot claim the credit for improvements made in 2023 on your 2024 taxes.

Generally, when filing an amendment to claim a refund, a taxpayer must file the amended return within 3 years after the date the original return was filed, or 2 years after the date the tax was paid, whichever is later. See IRS information on filing an amended return.