Preston have already handed £200k for the player which the football league feels it should pay a further £50k now with a further £250k in the new year.
So with the Lillywhites expecting to pay an initial £500k for the player the rest of the money will be based on appearances with the Railwaymen set to net £62,500 after the player has made 15, 30, 45 and 60 first team appearances taking it to £750k.
If Preston North End where to get promoted to the Premiership while Jones is still at the club then Crewe will net a further £250k so all in all the deal could be worth £1m.
The football league also said that any further sale of Billy Jones would also have a 20% sell on fee to the Railwaymen.
Jones has yet to feature in the league for North End although he did play in their 2-0 defeat to Morcambe in the Carling Cup.
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