People now get one to two hours less sleep each night, on average, compared to 60 years ago. A primary reason for this is the proliferation of electronics, which also allows us to work (and play) later than ever before.
The Internal Revenue Service requires that individuals be able to produce records proving any income, deductions or credit claimed for at least three years from the date of a return, the statute of limitations for how long the I.R.S. has to assess additional tax if all income was reported correctly.
Quick Answer. The Internal Revenue Service keeps copies of all versions of tax Form 1040 for up to six years. After that time, as required by law, it destroys them, according to the IRS. The IRS may maintain other tax forms for more than six years.