You can add gratuities to your Carnival cruise in two main ways: Pre-paid or Onboard. Pre-paying is the most recommended method; you can add them at the time of booking or anytime up to the day before you sail via the "My Cruise Manager" portal on Carnival.com. This allows you to lock in the current rate and budget your trip more accurately. If you don't pre-pay, Carnival will automatically charge a set daily amount (typically $16 to $18 per person, per day, depending on your stateroom category) to your Sail & Sign onboard account. These funds are distributed to your cabin stewards, dining room staff, and other behind-the-scenes crew members. You can adjust these amounts by visiting the Guest Services desk on board if you feel the service was exceptional or lacking. Additionally, an automatic 18% gratuity is added to all bar bills, specialty dining, and spa services at the time of purchase. In 2026, many cruisers prefer pre-paying to avoid a "large bill" on the final morning of their vacation.