The finer details of the duo's contract have been obtained by German news magazine Der Spiegel and published in the book Football Leaks.
According to the leak, Liverpool have committed to a 'clean-sheet bonus' of at least £250,000 for van Dijk when he signed from Southampton for £75 million.
Despite the Reds' defence showing a marked improvement since the Dutch defender's arrival, he will not secure the bonus for this season, requiring six more clean-sheets to reach a minimum of 15.
The centre-back will be entitled to £375,000 if there are 18 clean sheets next season, £500,000 for 20 and £750,000 for 22.
Liverpool will also have to fork out £4 million once Van Dijk reaches 150 appearances for the club, as long as they - ambiguously - ‘regularly' finish in the top four, too.
Van Dijk will also net himself £20,000 per goal or assist he contributes, which is usually an incentive included exclusively in a forward's contract.
Should the Reds choose to sell the defender before his contract runs out, Van Dijk will be entitled to a £5m loyalty bonus for honouring his deal.
Meanwhile, the added cost to Liverpool of Salah's sensational debut season is just £2.5 million, with the Egyptian reaching his bonus-target of 35 goals and assists for the campaign in February.
Salah, according to the book, is earning £123,000 a week following his move from Roma last summer.
This figure is however due to rise this summer as the Reds look to reward him and fellow attacker Sadio Mane upgraded contracts after their efforts this season.
The duo are likely to be offered a similar weekly wage as Roberto Firmino, who signed a five-year deal last month, said to be in the region of £180,000 a week - the highest at the club.
These details have been published in Football Leaks: Uncovering The Dirty Deals Behind The Beautiful Game. The book also reveals the extraordinary contract agreements between Arsenal, Chelsea and the two Manchester clubs and their star players.