Glossary

Interest tax shield

The interest tax shield is the tax saved by deducting allowable loan interest, which effectively lowers the cost of debt below its headline rate.

2 min read

Tax savedOn deductible interest
Lowers debt costBelow the headline

Definition

The interest tax shield is the value of tax relief on deductible interest. Because interest reduces taxable profit, borrowing carries a hidden benefit worth the interest times your tax rate. It is why the net-of-tax cost of debt is lower than the rate you pay.

In plain terms

The taxman effectively subsidises part of your interest, so debt costs your company less than the sticker rate.

Why it matters for your company

Factor the tax shield in when weighing debt against equity or reserves. See net-of-tax cost and WACC.

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