I have rent and bills to pay regardless of whether I'm making money, that is the definition of making a loss.
That is not a loss. That is an exchange of value; you pay $100 for your heating bill and receive $100 of heating.
A loss is when you have some value, and it disappears, and you have no compensating value. Buying a stock at $100 and selling it at $50 is a transaction in which you have less money at the end than you had at the beginning, and where you also had no compensating value exchange
Normal taxpayers do have rights to do things like carry forward losses in many circumstances. Business do get to be not taxed on expenses, but there are conditions on that. You can tell there are conditions on that because you can't just form an LLC and declare all your expenses to be losses, because you won't meet the conditions for your expenses to be losses. Note that that is the source of the problem, "form an LLC" is something you can totally do very easily, it's the failure for your personal expenses to qualify that is the problem.
While it might be emotionally satisfying to tax businesses on expenses, it's not hard to think about it a bit and realize why letting taxpayers deduct all their expenses, or trying to tax businesses on their expenses even when they didn't make a profit, are both not great ideas. (Think about the incentives created. Taxpayers don't need any more incentives to spend all their money on "expenses" as it is, if you've seen the credit card debt statistics.)
A person who works for 1 year for $100 income, then stops working the 2nd year (and live off their income from the 1st year), must pay their taxes at the $100 rate. If they are allowed the same 'carry forward' as a corp, they should pay at the tax rate of $50 for both years, rather than at $100 for the first year, and $0 at the 2nd year. And yet, this isn't allowed for a person. Of course, you could claim that the gov't can't tell that the first $100 is supposed to be 'averaged out' in the future. So would the situation be any different if you lived off savings for the first year, and replenished them in the 2nd year? I don't think this is any different.
It pits everyone against each other to make sure someone else gives more money to the same entity
Fascinating