On 1st of October, 2016 HST was increased in PEI

From 1st of October 2016 Province of Prince Edward Island increased the provincial component of the harmonized sales tax (HST). Provincial component of the harmonized sales tax in Prince Edward Island increased from 9% to 10% and total HST rate increased from 14% to 15%. HST calculator and Prince Edward Island HST calculator were updated accordingly.

Read here official announcement.