Form 6251 tax July 8, 2019 16 32 64 128 Form 6251 tax year 2021 Form 6251 alternative minimum tax Form 6251 alternative minimum tax individuals Form 6251 turbotax Form 6251 alternative minimum tax instructions Tax form 6251 for 2023 Form 6251 Form 6251 instructions Form 6198 explained Form 6251 instruction