Are you talking about 1040 line 24?
And even if Turbo Tax adds it on line 24 it is only an estimate. It's common and expected for the IRS to bill you for more depending on when they actually get your payment. Or even send you a refund for some.
Maybe you can fill out form 2210 to reduce or eliminate the bill from the IRS.
It's under
Federal or Personal (for Home & Business Desktop)
Other Tax Situations
Additional Tax Payments
Underpayment Penalties - Click the Start or update button
Form 2210 https://www.irs.gov/pub/irs-pdf/f2210.pdf
And 2210 Instructions https://www.irs.gov/pub/irs-pdf/i2210.pdf
