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https://estudiotributarioreyes.com/2021/01/04/sunat-obligados-a-partir-del-2021-a-emitir-comprobantes-de-pago-electronicos-r-s-n-o-000221-2020-sunat/
SUNAT | Obligados a partir del 2021 a emitir comprobantes de pago electr├│nicos [R. S. N.┬║ 000221-2020/SUNAT]