Solved

Sponsors bonus

Can anyone advise what you have to do to get the sponsors bonus and when it gets paid

In the main menu, before u start the race, u will see what position uneed to reach to get the bonus.
During the race there is a green line (depending on what device u play)
It gets paid at the finish of the race.

Thanks, I have not noticed the position required before the race, but have seen this mentioned at the end of the race.  I have received sponsors income but never the bonus amount

At the end of the race u see the total amount of money received. That is, sponsor money+ sponsor bonus- salaries etc.

U say u never got the bonus. 
Have u ever reached a position worthy of sponsorbonus?
("Finish the race" might also be a worthy position.)

Sponsorbonus-positions change troughout the season depending on results. If u start off after a great seasonending u will probably need to end high the first races. After a couple of bad results the target will drop, to eventually end up at the bottom with "finish the race".
If u keep finishing below 18 the bonus will be easily aqcuired every race by just finishing last.
Great way to keep the cashflow going.

Then when ur ready to compete for points u can try n race, at risk of u losing money due to not reaching the target again and losing a lot of money (depending on costs of salaries etc).
Goodluck

Thanks guys, I did not realise the prize money and the sponsors bonus were the same thing