Good to see you on the thread, @Mark chiacchio.
I'd be happy to share some insights about our QuickBooks products.
If you use QuickBooks Online (QBO), you'll need to sign-up three accounts for each stores since one company file is equivalent to one subscription especially if each business has separate Tax reporting. This way, you can generate a different expense and other financial report for it.
In your case, since you have different EINs for each store, you may consider using QuickBooks Desktop version. This allows you to create multiple company file with different EIN under one subscription.
To help you decide which products best suite your needs, I recommend checking these links:
If you have other questions or concerns, visit again. We're always glad to help in any way. Have a great rest of the day.
