Earn a fortune – to earn a lot of money
He made a fortune on the stock market.
Tighten your belt – to reduce the amount of money that you normally spend.
We’ve had to tighten our belts since my wife lost her job.
Chicken feed – an amount of money that is too small to be significant.
It’s a nice job but the salary is chicken feed.
Feel the pinch – to have financial problems because you are not earning as much as you used to earn.
When his parents lost their jobs they began to feel the pinch.
Hard up – not having enough money.
I’m hard up these days.
Keep the wolf from the door – to have just enough money to buy basic necessities.
He works two jobs to help keep the wolf from the door.
Have deep pockets – to have a lot of money
This company has deep pockets.
Get your fingers burnt – to suffer loss as the result of doing something risky
He got his fingers burnt in foreign markets.
Cost an arm and a leg – to be extremely expensive.
The fur coat cost her an arm and a leg.