All depends on what you want to do and where you are located. This forum cover a lot of it
viewtopic.php?f=3&t=557&p=3960&hilit=costs+budget#p3960I am in my first season and these are the costs to consider based on my recent experience:
Renting per race weekend: ~$2.5-$3.5k depending on location and number of days
Licence: ~$100
SCCA Membership: ~$90
Buying a car costs: ~$12k (needs work/updates) to $37k (brand new, data system, goodies)
Trailer and tow vehicle: ????
Suit/Helmet/Gloves/Hans/Arm restraints/Boots/Underwear etc: $1k-$4k
These cost all depend on the number of events you do a year
Tyres (+mounting/balancing): ~$900 a set generally you can get 8-10 heat cycles on the rears maybe 16 on fronts
Entry fees: Race days depends on the region and venue ~$400-$600
Test day entry fees: $400-$500 depends on the track
Hotels: Depends on you comfort level
Towing fuel
Damage/fixes
Brake pads/Oil/Plugs/Misc
Engine rebuilds
People that have been racing for awhile can probably give you a better idea of annual costs and it varies from the privateer to the custom shop arrive and drive.