You may want to set up a promotion to automatically apply when members renew their memberships.
At this time, Altru can only configure Membership Promotions to apply 'with code' or 'manually'. The discounts cannot be configured to apply to automatically. If you would like to see this functionality added to Altru in the future, we encourage you to vote on this post as this is an opportunity to have a voice in the product development process. Our Product Management team uses a variety of methods to determine new features in Altru, and the ideas in the Community are one way they do this.
If you would like to create a discount that can be applied manually or with a code, we can follow the steps in this Knowledgebase Solution: I need to add a membership discount.