Do I have to taper the bottom of each layer of a topsy turvy cake?

It would depend on what look you were trying to achieve. It can be done, successfully, without tapering the sides.

The upper two tiers on this one don't look to be tapered...



nor these...


nor these...

Check out Pink Cake Box's website. Few of hers are tapered.

Thanks everyone! I'm not sure what I'm going to do yet. I'm a little scared to taper