The document says the initial fee of 50m Euros (£38.5m) for the player is to be paid in two installments – €20m (£15.4m) within three days of his transfer, and €30m (£23.1m) on July 1.
There are then three further potential payments – €10m (£7.7m) if the player scores 25 first-team goals for Manchester United, €10m (£7.7m) if Martial makes 25 appearances for the French national team and €10m (£7.7m) more if the player is ever nominated for the Ballon d’Or award.
There is also a sell-on clause inserted in the deal, with Monaco due to be paid 50 per cent of any transfer fee between €60m and €100m United receive for the player.
Martial was the most expensive teenager in the world when Manchester United bought him in August, and he signed a four-year deal with the club.
The forward, who has scored eight goals in 26 appearances so far this season, had signed a new deal with Monaco in June, when the Ligue 1 club’s vice-president Vadim Vasilyev called the player "untransferable", only for him to move less than two months later.