Yes. You must retain all records relating to your PPP loan in your files for six years after the date the loan is forgiven or repaid in full. These records should include documentation submitted as part of your PPP loan application, documentation supporting your certifications as to the necessity of the loan request and your eligibility for a PPP loan, documentation necessary to support your loan forgiveness application, and documentation demonstrating your material compliance with PPP requirements.
You will also permit authorized representatives of SBA, including representatives of its Office of Inspector General, to access such files upon request.
You can find details about what documentation you must retain (if you were not required to submit it) in the instructions for each Form listed at the bottom of the SBA's "PPP Loan Forgiveness" page.