To clarify: a fiscal host acts as the legal entity and bank account for other smaller entities. So an organization that's already established as a co-op will hold your money in their bank account so that you don't have to worry about handling taxes or book keeping while you get started and if you need to sign a contract or something it's technically with the parent organization so you can use their business vehicle. I know of lots of non-profit ones, but none specifically for developing co-ops.
@beckett That's definitely a big benefit of doing it in the non-profit context, but in a for-the-benefit-of-members co-op that may not have a non-profit mission I still think it can be useful. It effectively becomes collective accounting/lawyering, which could save a small co-op lots in expenses until they need more control over their own finances and the like.
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