It varies a lot. I have two horses, but for simplicity's sake let's focus on one and break it into categories. Things I have to buy only once:
Horse was $2000.
Saddle was $1500.
Bridle/bit/breast plate/saddle pads/additional tack was around $500 all together.
Brushes/grooming supplies/tack trunk -- $100
Blankets and sheets -- $200
Clothes for me as a rider -- $350
And let's add an extra $1000 for stuff I don't remember.
Total one-off: $5650
The monthly basics that never change:
I spend $250 a month on board.
I spend $100 a month on feed.
I pay this monthly, 12 times a year.
Monthly basics for a year: $4200
Monthly expenses that vary:
Wormer and fecal egg count testing every six months = $50
Shoes seven months out of the year during show season. Shoes reset every six weeks = roughly six shoeing a year. Shoes are $200 a round = $1200
Barefoot the other four months, trimmed every six weeks = 3 trimmings at $40 a trim = $120 Varying monthly expenses: $1370 Vet visits:
Extremely variable! But I allow $500 a year for vet bills.
Vet visits: $500
Grand total horse for a year: $11, 720
This does not account for showing and traveling expenses. I would be embarrassed to reveal how much I spend on that!