Kimi Raikkonen has admitted money was a major factor in his decision to move from Lotus to Ferrari for 2014.
The Finn has had a history of problems with late payments of his salary with Lotus, and when looking for financial guarantees going forward, Raikkonen said they were not forthcoming, in an interview with Autosport.
"The reasons why I left from the team are purely on the money side, and the things I haven't got, my salary," said Raikkonen. "That is an unfortunate thing."
The 2007 champion said however there was plenty of reasons why he would of stayed at Lotus.
"There were a lot of things, I am sure they know what there are," he said.
"It is hard to say which way it would have gone if it would have happened, but I am very happy [with my decision]."
According to Autosport, the issue with Raikkonen's salary is not over the basic amount he is paid but performance based bonuses.
Raikkonen also played down doubts from a few in the F1 paddock that he and his future team-mate Fernando Alonso will have a difficult and potentially explosive relationship.
I don't see the reason why it will not work," Raikkonen said. "We are all old enough to know what we are doing and the team is working to make sure, if there is something, that we can talk it through.
"It is not like we are 20-year-old guys any more. I might be wrong, but time will tell.
"I am pretty sure all things will be good. For sure there will be hard fight on the race circuit, and sometimes things go wrong, but I am pretty sure it will be OK."
Kimi also expects an easy transition back to Maranello as some question whether he has a good enough work ethic to match Ferrari's expectations.
"I know the team, and I know the people, although obviously there are some new people and more have left since I was there," he said.
"I don't think it will be too difficult to go there and do well. The car is different, and the most difficult thing is the cars [in 2014] are different. Whoever makes the best car will make the most out of it."
When asked directly as to whether he can be a motivational force to push the team forwards he added: "There are lots of stories, but I think we did pretty good in this team [Lotus] from where we started and I don't see reason why we should not be able to produce a very good car next year and keep improving it.
"It is a new challenge for all the teams but I have no worries about these things."
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