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irs.gov - Complete information on income taxes for both individuals and businesses. Download forms and instructions for your I.R.S. return. File your taxes electronically.

completetax.com - Get a Quick Refund with CompleteTax.

taxpolicycenter.org - Information on the composition of taxes; distribution of tax burden and changes in tax burden over time.

reespollock.co.uk - A summary of current UK corporate and personal tax rates.