The backbone of any business is capital, so getting paid on time is essential. Think of your invoice as a type of insurance policy for client payments. It doesn’t guarantee you’ll get paid, but it does establish that goods or services were delivered and your right to payment. It doesn’t happen all the time, but if a customer or client fails to pay, you can use the contract and subsequent invoice(s) as evidence your clients owe you for the items provided. On the same token, you can store invoices you’ve received from your contractors or vendors after you’ve remitted the payment to show that you’ve met your obligations.