The reported decision, ahead of Israel's April 9 election, deepens uncertainty over Netanyahu's prospects in a tight race.
The actual filing of the reported charges, which include bribery, fraud and breach of trust, will depend on the outcome of a required hearing. At that hearing — likely after the election — Netanyahu can try to persuade the attorney-general not to indict him.
Netanyahu, who is seeking a fourth consecutive term, denies any wrongdoing. In the long-running investigations, he is suspected of wrongfully accepting gifts from wealthy businessmen and dispensing favors in alleged bids for favorable coverage by a newspaper and a website.
Netanyahu's right-wing Likud party described the reported charges as "political persecution". It said the prime minister, who has vowed not to resign over the allegations, was due to deliver a statement at 8 p.m. (1800 GMT) local time.