How do discount codes work with products that have a subscribe and save discount incentive?

Discount codes provide an additional discount on top of the incentive discount set when a customer chooses to subscribe and save. An incentive discount ensures that the price of a product is discounted if the customer decides to purchase the product as a subscription. If a discount code is used at checkout, it will apply to the already discounted price that the customer received for purchasing the product as a subscription.