Document Retention
Federal law requires you to maintain your tax return copies and supporting documents for 3 years, known as the "three year law."
If the IRS believes you have under-reported your income by 25% or more, or suspect fraud, they can go back 6 years in an audit.
To be safe, follow these guidelines:
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Create a Backup Set of Records and Store Them Electronically. Keeping a backup set of records -- including, for example, bank statements, tax returns, insurance policies, is easier than ever now that financial institutions provide statements and documents electronically, and financial information is available online.
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Even if the original records are only on paper, they can be scanned and converted to a digital format.
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Once the documents are in electronic form, taxpayers can download them to a backup storage device, such as an external hard drive.
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Online backup, is really the only way to be sure your data is fully protected and remains safe in the event of a natural disaster or personal emergency.

Personal Documents - 1 YEAR
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Bank Statements
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Paycheck Stubs (reconcile with W-2)
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Canceled checks
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Monthly and quarterly mutual fund and retirement contribution statements (reconcile with year end statement)

Personal Documents - 3 Years
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Credit Card Statements
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Medical Bills (in case of insurance disputes)
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Utility Records
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Expired Insurance Policies

Personal Documents - 6 Years
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Supporting Documents For Tax Returns
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Accident Reports and Claims
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Medical Bills (if tax-related)
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Property Records / Improvement Receipts
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Sales Receipts
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Wage Garnishments
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Other Tax-Related Bills

Personal Documents - Forever
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Audit Reports
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Legal Records
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Important Correspondence
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Income Tax Returns
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Income Tax Payment Checks
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Investment Trade Confirmations
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Retirement and Pension Records

Business Documents - 1 Year
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Correspondence with Customers and Vendors
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Duplicate Deposit Slips
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Purchase Orders (other than Purchasing Department copy)
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Receiving Sheets
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Requisitions
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Stenographer's Notebooks
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Stockroom Withdrawal Forms

Business Documents - 3 Years
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Employee Personnel Records (after termination)
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Employment Applications
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Expired Insurance Policies
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General Correspondence
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Internal Audit Reports
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Internal Reports
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Petty Cash Vouchers
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Physical Inventory Tags
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Savings Bond Registration Records of Employees
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Time Cards For Hourly Employees

Business Documents - 6 Years
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Employee Personnel Records (after termination)
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Employment Applications
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Expired Insurance Policies
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General Correspondence
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Internal Audit Reports
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Internal Reports
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Petty Cash Vouchers
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Physical Inventory Tags
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Savings Bond Registration Records of Employees
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Time Cards For Hourly Employees

Business Documents - Forever
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Employee Personnel Records (after termination)
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Employment Applications
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Expired Insurance Policies
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General Correspondence
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Internal Audit Reports
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Internal Reports
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Petty Cash Vouchers
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Physical Inventory Tags
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Savings Bond Registration Records of Employees
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Time Cards For Hourly Employees
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