Every year, many taxpayers lose out on valuable money simply because they don’t know their energy-efficient home improvements qualify for tax credits. Luckily for homeowners, the fiscal cliff law did extend the tax credits for energy-efficient home improvements in 2013. Plus, if you made any home improvements between 2006 and 2012 and you never claimed these as tax credits, you may still be eligible to receive a one-time tax credit of up to $500.