IKEA Family members receive a birthday coupon by email the week before their birthday month, valid for that month. IKEA's US page does not state the coupon amount.

IKEA Family membership is free, but timing matters: you need to have been a member for at least 30 days before your birthday month, with your email and marketing settings updated at least 30 days prior, or the coupon will not arrive. Request this Freebie