*Loan,banking and credit>>>business tax

How do taxes work for a business that lost money?

If I started a business and expectedly lost more money buying stuff/expenses than I would earn by the end of Dec., what would happen at tax time?

We need more facts. But lets assume that you have wages from a law firm and run a tax accounting business on the side(like me). You pay rent on an office, buy computers, put ads in the papers, and use your car to visit clients, but your expenses exceed your income this year.

You depreciate your car and claim all the expenses and the income on schedule C, and take the net loss against your wages.

Complications arise if you have no reasonable expectation of a profit over the next 5 years, and if you incorporate that is a totally different ball game. You could also have a net operating loss (no wage or investment income to offset your loss).

Nothing...you would owe nothing. And if you paid any quarterlies, they could either be refunded or applied as a credit.
Depends on the type of business. If it's a c-corp then there would be no federal tax liability, and the loss would carryforward to a future year. If it's an s-corp than you would get a K-1 at year passing the loss through to you to report on your personal return. And if it's a schedule C business, then you would report that on your personal return as well.
That is very common for a new business to have "Losses" especially when just starting. That amount will be written off as a loss, which will typically lower your taxes. You should owe less. Good Luck!
You need to go to a tax preparation professional.
An accountant or call H & R Block and make an appointment,
The preparer will explain what types of business expenses you can deduct against your income.
If you have a total loss for the year, find out if you can carry it over against future year's income.