Oh what a relief. No more keeping old filed incomes taxes for 7 years. Now it is only 3 years, thus tax year 2017, 2016, 2015. Unless you had declared a loss then you would need to keep them for 7 years. So start shredding my friends. I have dug into my own old filed taxes a few minutes ago but the old shredder just broke with a loud pop. Time to get a new one that can shred more than 2 pieces of paper at one time :P I'll be glad to get rid of my late parents old filed taxes, too.