You can do either one.
Refer to the TurboTax Help article: How to Pay Taxes: 10 Ways to Pay Your Tax Bill and How can I pay my federal taxes?
There are several options when you have a tax bill that you don't have the money to pay. Refer to the following articles: How to Pay Taxes: 10 Ways to Pay Your Tax Bill, Unable to Pay Your Tax Bill? Here’s What To Do, and the IRS article What if I can’t pay my taxes?