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.
Invoice-Keeping Timetables. The IRS recommends keeping invoices that will help substantiate business income or deductions during the entire statute of limitations for when the tax records can be changed or reviewed. This is generally three to seven years, depending on the circumstances.