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If you finish your tax return and are confused as to why you need to send the IRS a check, there is only one possible explanation for this: you paid less tax during the year than you owed for your income level. Watch this video to find out more about why you may owe money of your tax return. https://turbotax.intuit.com/tax-tips/tax-payments/video-why-do-i-owe-on-my-tax-return/L2Q7kQ2Fv
You can also see "Explain Why" within the product and see if that explanation helps. Otherwise, you would need to contact support to have someone review your specific tax situation. https://support.turbotax.intuit.com/contact/