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How is income tax calculated in relation to selling used items?
If I sell it for $50 can I write off the $50 loss. Only if you can establish that it is a normal part of your business and that you did not get $50 worth of use out of it.  That's the technical, legal argument.  As a practical matter, it's unlikely that they'll ding you for selling something after using it, as they won't know.  If they did catch you, you would be in trouble.  You can't deduct loss due to personal use.   The larger problem is that if you sell one TV for a $50 loss, they aren't going to believe that you are in the business of selling TVs.  If you sell a larger amount for a loss, then they still are unlikely to believe that you are in business.  If you sell a large amount for an overall gain, they are unlikely to notice that you took a loss on one TV.  They could only notice that if they were already auditing you, as that wouldn't be visible in your tax forms.