NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Optimal Debt and Profitability in the Tradeoff Theory

Andrew B. Abel

NBER Working Paper No. 21548
Issued in September 2015, Revised in January 2017
NBER Program(s):Corporate Finance

I develop a dynamic model of leverage with tax deductible interest and an endogenous cost of default. The interest rate includes a premium to compensate lenders for expected losses in default. A borrowing constraint is generated by lenders’ unwillingness to lend an amount that would trigger immediate default. When the borrowing constraint is not binding, the tradeoff theory of debt holds: optimal debt equates the marginal tax shield and the marginal expected cost of default. Contrary to conventional interpretation, but consistent with empirical findings, increases in current or future profitability reduce the optimal leverage ratio when the tradeoff theory holds.

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Document Object Identifier (DOI): 10.3386/w21548

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