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Personal taxes for Shopify / Paypal shop?
(do I need to get a W9 from our suppliers)? Will PayPal or Shopify send me a 1099k or something? Do not assume that you'll get paperwork from anyone.  Do assume that you have to generate your own paperwork.  Ideally you should print out some kind of record of each transaction.  Note that it can be hard to view older transactions in PayPal, so start now.  If you can't document something, write up a piece of paper showing the state of the world to the best of your knowledge.   Do assume that you need separate receipts for each expenditure.  The PayPal receipt might be enough (but print it in case the IRS wants to see it).  A receipt from the vendor would be better (again, print it if it is online now).   A CPA is not strictly necessary.  A CPA is certified (the C in CPA) to formally audit the books of a corporation.  In your case, any accountant would be legally sufficient.  You still may want to use a CPA, as the certification, while technically unnecessary, still demonstrates knowledge.  You may otherwise not be in a position to evaluate an accountant.  A compromise option is to go to a firm that includes a CPA and then let them assign you to someone else to process the actual taxes.   You are going to have to fill out some business tax forms.  In particular, I would expect a schedule C.  That's where you would show revenues and expenses.  You may well have to file other forms as well.