She already operated a jewelry business as a sole proprietor, and is opening a separate jewelry business for which she spent $30K on inventory in 2019, but did not start selling until 2020. The businesses will have different trade names. Neither is an LLC but I would put both of them under the same business activity code. If we file both businesses under the same schedule C, can we deduct these costs in 2019?
As one of my favorite Stones songs says - you can't always get what you want.
You can only deduct when the business is open and when the inventory is sold.