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Yes, you can include the interest to your liability check, @bcnorgard
Let me guide you how to do it.
You can refer to this article for step-by-step instructions: Set up and pay scheduled or custom (unscheduled) liabilities.
Should you wish to pay the interest only, you can E-pay it directly to the state agency or IRS website. You can check this article for more detailed steps: Correct liability payments made in Write Checks instead of Pay Liabilities.
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