A miniature horse does not eat as much as a bigger horse. This will cost you less in the long term. They still require hay every day, access to grass, and sometimes grain.
You can expect to pay at least $200 per year for the basic vet expenses.
Training Costs
A driving harness for a mini will cost $400 to $1,400 dollars. A cart costs between $350 to $1,500 dollars. Training will easily cost several hundred dollars.
Overall, how much does a miniature horse cost per year is easy to answer; it is cheaper. When you take out the initial purchase price, you will pay a minimum of $750 per year. However, that is without extras such as supplements, worming, and land maintenance.