Without leverage, Impi Corporation will have net income next year of $10.0 million. If Impi's corporate tax rate is 21% and it pays 9% 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.)