[wprapido]

Incorporate, only if/when it begins generating revenue. As of the other concerns, I keep separate emails, hosting servers, SaaS subscription, PayPal/Stripe/Payoneer/bank accounts for every side project that might bring in revenue, even negligent.

[ian0]

This is really important.

If possible run all your expenses through a single dedicated personal bank account. Where each of the founders transfers into this first and expenses are paid from here. Saves a tonne of hassle later.