Hey Ken,

Sounds like the perfect opportunity to create a custom promotion and you can implement the logic you want in your processor. 

https://world.episerver.com/documentation/developer-guides/commerce/marketing/custom-promotions/

Hi Joel,

Indeed, we already use our own custom promotions & custom processors. 
But within our custom logic, we like to leverage built-in Epi classes/methods wherever we can. 
For example, our custom logic still uses:

var redemption = CreateRedemptionDescription(affectedEntries); // EPI FUNCTION

return _rewardDescriptionFactory.GetPercentageRewardDescription(promo, redemption, promo.Discount.Percentage); // EPI FUNCTION

So I'm wondering if there is anything built-in that we could leverage to allow a % off discount, while enforcing a maximum discount amount?

I don't think there is a builtin feature for it, or there is an easy way to do it. Well, unless I overlooked 

Since it's fairly simple logic, I would just create my own custom processor and implement the logic there. You can take inspiration from how the built in promotions are built and just tweak the logic so you implement your barrier :)