The acronyms PST and TVQ/QST refer to the provincial equivalents of the goods and services tax. PST stands for provincial sales tax, which is the applicable tax in the provinces that do not participate in the harmonized sales tax regime but still have provincial taxes. The provinces with PST are British Columbia, Manitoba and Saskatchewan.
TVQ/QST stands for Taxe de Vente du Québec/Quebec Sales Tax. The Quebec regime is unique because it is largely harmonized with the federal GST but the provincial entity, Revenu Québec, is in charge of administering both taxes in the province.
Alberta is the only province without a sales tax.