Become a Taxi driver by going to the Taxi rank
Collect citizens who are in need of transport and start the meter (fare). 
The money will transfer to your pocket as soon as you stop the meter (fare), 
so being tricked by your customers won't happen; you can relax. 

Requirements:
$4.000 to buy the taxi,
a Driving License,
Vehicle skill level: 5.

Payment:
$220 every 30 minutes
Plus the fare of the journeys

The following vehicles can be used as a Licensed Taxi

SUV Taxi  Cost: $4.000 Sell: $0.000 Trunk: 500 kg

Audi Q7 Taxi  Cost: $4.000 Sell: $0.000 Trunk: 500 kg

Golf GTI Taxi  Cost: $4.000 Sell: $0.000 Trunk: 500 kg

​​​   BMW M3 Taxi  Cost: $4.000 Sell: $0.000 Trunk: 500 kg

Paycheck: $220 every 30 minutes

See also:
Taxi Rank
DMV
Taking tests
Shop Locations
Paychecks