If I decide to sell on eBay or have Shopify store how does the profits and gains work on your taxes if get paid from the customer for example and clock sold for 18 bucks and I bought the item form the merchant for 15 dollars to send it to the customer does that mean my profit Loss would be the 15 dollars and my profit gain would be the 3 dollars I made of the sale ? And would that profit loss be deducted off what I owe for my total sale for the year?
