Requirements for Retaining Information for the IRS
The IRS has the following requirements for retaining 1099 information returns:
You must retain a copy of the 1099 returns filed with the IRS, or be able to recreate the information, for three years from the reporting date.
If the return includes backup withholding, you must retain a copy or be able to recreate the information for four years from the reporting date.
See IRS Publication 1220 for additional retention information and exceptions.