tdgeek:
If he business floor area is 8%, you are taxed on the capital gain of the entire home?
"The rules get more complicated for people who work from a home office.
They would be able to claim an exemption on any gain in the value of that home, like other home owners. But they would then no longer be allowed to deduct any costs related to their property, such as rates or mortgage payments, from their taxable income.
Alternatively they could choose to keep those deductions, but pay tax on any capital gain on the proportion of the home that they used for business, when they sold it."
No, it's based on floor area; but that begs the question about things like a two bedroom apartment, or a storage garage or people who have a yard on their family home like some contracting companies.
In a two bedroom apartment, you could conceivably be giving up a massive portion of any capital gain that isn't inflation-adjusted.