Visit the ADP or the Tax Policy Center websites to view state unemployment tax rates. ADP offers a fact sheet for each state that includes unemployment tax information, and Tax Policy Center provides a table of tax rates and downloadable files with historical information, as viewable on their websites.
Employers calculate state unemployment taxes by multiplying the applicable tax rate by employee wages, explains BizFilings. Each state caps the amount of wages subject to unemployment taxes. States set each employer's tax rate using an experience rating that measures the employer's involuntary unemployment. Tax rates increase as an employer has more layoffs and firings. New employers pay a standard rate until they receive an experience rating. Both the ADP and Tax Policy Center websites list the wage caps, range of tax rates and new employer rates for each state.