vet fees/calls can change depending on location but here's MY basic breakdown:
I get my shots twice a year. I get just about everything, which depending on where you live, you may not needs some, such as Potomac Horse Fever and West Nile Virus, also I get Botulism, if you don't feed round bales, you won't need that one.
Truthfully, what you really need is a rabies, tetnus, and I would suggest the 4 way. (is it 4 or 3?)
Anyway, for just about everything I pay about $100 per horse twice a year. Once a year I get a coggins which is around $24. My farm call is $75 and my exam fee is $25. Some of my horses get teeth done twice a year, but lets go with a once a year, that's about $100 because we drug for that.
SO... for one horse in my area getting everything (once a year) you are looking at about $225 in shots and $100 in floats, which can be don at a different time. Just remember you pay the farm fee and usually an exam fee with each visit. My vet is high on the farm call, most are around $35.
For emergency you can expect to pay around $200 - 300 per emergency. To be safe, I'd plan for 2 a year.
"Be a best friend, tell the truth, and overuse I love you
Go to work, do your best, don't outsmart your common sense
Never let your prayin knees get lazy
And love like crazy"