Effective April 1st, 2020, Norwegian will be amending their discretionary daily service amount for onboard services, simply put - they're adding a nominal increase to gratuities.
If you're already booked, no problem! Pre-payment before the date of sailing will secure you the existing rates; any new bookings made before March 31st, 2020 will enjoy the same.
The new rates will apply on or after the change will be as follows:
$15.50 per person, per day for cabin categories up to mini-suite
$18.50 per person, per day for suites up to The Haven