Click on Profile and select account settings from the drop-down menu.
You could see Preferences Tab, click on it.
Now scroll down to the end and you can find a checkbox as Fiscal Year Reset.
Select the checkbox and click on save button.
Note: If you set the fiscal year reset : The invoice number will start from one. Set the fiscal year reset in advance i.e set the future date, so that will be amend from that date, advised you to not set the back date.
Note: You can able to set the fiscal year reset once in year.