While the design firm would sit on the lower end of the liability spectrum, (courtesy of Shane Murphy/Ownr), serving people potable tea (and possibly edible good) does introduce a lot of liability.
In terms of taxes, the income would be pretty low on the teahouse side of things, but you would expect the design studio to be pulling in ~100k per employee, so maybe ~500k. At that point, there’s no question it would be incorporated. The teahouse could easily be a part of Design Studio Inc. but may want to be a separate corporation to contain liability.
I asked about what considerations to make for putting different lines of business within a single corporation vs separate corps—his recommendation is to to start with the most simple structure possible (one single corporation) and build a solid business.
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(To transfer from a sole prop to a corporation (something Ownr does multiple times per hour), you just have to inform the government that you are the owner of XYZ Trade Name and you want to transfer it).