When do I need to complete the Post-Booking Bonus form to qualify for my onboard credit? March 21, 2019 14:45 Updated To qualify for your onboard credit, you must fill out the redemption form no later than 21 days prior to departure. Related articles How do I redeem the Onboard Credit? When will my onboard credit be applied to my account? How do I pre-register with the cruise line? What is my Post-Booking onboard spending amount? What if I wait too long to complete the redemption steps for my Post-Booking Bonus?