Without having all of your details it is impossible to answer that question.
It never hurts to walk back through your entire tax return and review your entries before you submit your return. It is also a good idea to look at your 1040 to see if your numbers make sense. You can see your 1040 by clicking Tools>>Tax Tools>>View Tax Summary>>Preview My 1040.
If you made a decent amount by running your own business, it does make sense that you would have to pay in. The other people you did their taxes for, did they have their own business or did they have an employer who withheld taxes and issued them a W2? Being self-employed greatly impacts your tax situation.
If you are a business, are you using TurboTax Self-Employed? Did you take all the business deductions you are eligible for? There are many possible answers here. You may want to click on the live help link in the upper right hand corner to have someone look at your return if you are not sure if your numbers on your return make sense.
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