Keep all papers and documentation you used in preparing your return until the statute of limitations runs out. This is usually four years from the date the return is due or filed.
Many taxpayers maintain their records much longer than four years. There are various reasons why the statute of limitations may remain open much longer than four years. If the federal IRS audits your return after the four-year time frame or if the Department of Revenue discovers that your return was not received, you may need to provide copies of your return and back-up documentation after the four-year timeframe. Additionally, the information on certain tax matters may be needed long after the statute of limitations expire.
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