STEP 1. Click the Gear Icon.
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​STEP 2. Select Account and Settings.
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​STEP 3. Go to the Advanced tab.
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​STEP 4. Under the Accounting section, put a check mark in the Close the books box.
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​STEP 5. Enter the Closing date.
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STEP 6. Set whether a password is needed to change closed transactions.
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​STEP 7. Click Save and Done.