Form 1040 estimated tax instructions July 8, 2019 16 32 64 128 Form 1040 estimated tax penalty instructions Form 1040 line 38 estimated tax penalty instructions 2024 form 1040 es estimated tax voucher and filing instructions 2023 form 1040 es estimated tax voucher and filing instructions Form 1040 explained Form 1040-x Form 1040 Tax form 1040