how many years of tax returns to keep
Do not file a return. No limit. File a claim for credit or refund after you filed your return. Later of 3 years or 2 years after tax was paid. File a claim for a loss from worthless securities. 7 years. These time frames are for the material used to file your tax return. As for the filing itself, you should hang on to the actual Form 1040 and accompanying schedules and forms forever.