Special Sales Tax. Combined Sales Tax. The Alabaster, Alabama sales tax is 9.00% , consisting of 4.00% Alabama state sales tax and 5.00% Alabaster local sales taxes.The local sales tax consists of a 1.00% county sales tax, a 3.00% city sales tax and a 1.00% special district sales tax (used to fund transportation districts, local attractions, etc). Alabaster Alabama Sales Tax Exemptions.