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internal revenue service irs taxes filing income taxpayer returns refund deadline payments penalties compliance audit documentation deductions credits tax federal form code regulations e-filing withholding bracket gross adjusted status social security medicare employer employment self-employed wages w-2 1099 taxpayers#39aph39# rights laws office online services taxpayers assistance identification rate policy financial reporting payment plans installment agreement agents guidelines dependent capital gains season property business estimated refundable return year liability interest penalty voluntary disclosure e-file quarterly charitable donations requirements hotline