If you want to close down your Project, you can either archive or delete it. Either way, you first need to zero the balance.
Go to your Project's page, click on the gear icon next to your logo and head to the Advanced page to access those options.
Delete a Project
If your Project does not have any transactions or financial activity, you can delete it. Deleting a Project will remove its data, including memberships, payment methods, etc.
If your Project has transactions associated with it, you will have to archive it. The reason we cannot delete transactions is the financial ledger must retain its accuracy and integrity. Your income is someone else's expense, and your expenses are someone else's income.
Archive a Project
If your Project has transactions, you can archive it instead of deleting. This will mark the Project as inactive and prevent any new donations.