Originally Posted by MacabreMikolaj
If you are self employed as a boarding business or a trainer or coach, you have to pay taxes on your income (a regular job deducts them automatically). In these circumstances, a horse is nothing more then a product. To write something off means she is applying it as an expense against income earned so she doesn't have to pay tax on that income. For example, gifting a horse could be a tax write off because it's a charitable donation.
It's difficult to tell if she means a genuine tax write off or if she's using it as an illegal tax write off, but it just means she's using his value against her income so she pays less taxes on it.
This. Technically as a trainer/instructor I am independently employed. I write my horses and all of their expenses/equipment off as it is considered a part of my business. While yes, this does sound like a cool idea for those who don't have this option I pay a hefty HEFTY amount in taxes and something called "pre-taxes" since I don't have a paycheck that automatically deducts it out.