when to thow away payable receipts

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: I am a dentist who manages my own payable system. Since I have established my practice, I have always
: filed my payables according to vendor. Now, 8 years later, my files are overflowing and no employee
: wants to go near my files to add the next paid invoice! I am running out of space and want to achieve an
: organized system. My fear is discarding an ivoice in case the IRS comes knocking! Any ideas on how
: and what to save and discard?? 


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