The $2.2 trillion Coronavirus Aid, Relief, and Economic Security (CARES) Act delivers good news to individuals and businesses, including valuable tax-relief measures. Some of that tax relief is retroactive. These provisions can affect 2018 and 2019 returns that have already been filed. One retroactive provision can, in some cases, go all the way back to 2013. Some taxpayers that file amended returns may receive a tax refund from prior years.