One of Evreward's most popular merchants since 2009, Calvin Klein offers coupons, cash back rebates and rewards, with savings as high as 50% off. Calvin Klein discount coupons are infrequent, only available a couple times per year, and can be less valuable than similar merchants. Even when Calvin Klein doesn't have a coupon, you can always get up to 15% cash back, and other great rewards, with every purchase.