If you live on a farm it's a little cheaper... I pay about 300.00 a month in various things fer him... like... 50 lb. bag of oats... tending to his hooves.. possible vet bill if I need him to come out to farm... .. they are spendy pets... more so then my dog.. horses need more attention. think hard before you buy one.
Depends partly on at home or board and where you're located but hay (2% of their body weight daily) grain, farrier (every 6-8 weeks), vet minimum once a year, dewormer, emergencies, tack, grooming supplies, etc... Approximately 500 a month