Without leverage, Impi Corporation will have net income next year of $6.0 million. If impi's corporate tax rate is 21% and it pays 6% interest on its debt, how much additional debt can Impi issue this year and still receive the benefit of the interest tax shield next year? (Note: Assume Impi's revenues exceed $24 million, and that interest tax deductions are limited to 30% of EBIT under the TCJA.)