Tax shield

A tax shield is the reduction in income taxes that results from taking an allowable deduction from taxable income. For example, because interest on debt is a tax-deductible expense, taking on debt creates a tax shield. Since a tax shield is a way to save cash flows, it increases the value of the business, and it is an important aspect of business valuation.

Example

Case A

Consider one unit of investment that costs $1,000 and returns $1,100 at the end of year 1, i.e. a 10% return on investment before taxes.
Now assume tax rate of 20%.
If an investor pays $1,000 of capital, at the end of the year, he will have $1,080. He earned net income of $80, or 8% return on capital.

The concept was originally added to the methodology proposed by Franco Modigliani and Merton Miller for the calculation of the weighted average cost of capital of a corporation.

Case B

Consider the investor now has an option to borrow $4,000 at 8% interest rate.
If the investor still pays $1,000 of his initial equity capital, in addition to borrowing $4,000 at the terms above, the investor can purchase 5 units of investment for $5000 total.
At the end of the year, he will have:, –$4,000 repayment of debt, –$320 interest payment, and $. Therefore, he is left with $1,144. He earned net income of $144, or 14.4% return on his $1000 initial equity capital.

The reason that he was able to earn additional income is because the cost of debt is less than the return earned on the investment. The 2% difference makes income of $80 and another $100 is made by the return on equity capital. Total income becomes $180 which becomes taxable at 20%, leading to the net income of $144.

Value of the Tax Shield

In most business valuation scenarios, it is assumed that the business will continue forever. Under this assumption, the value of the tax shield is: x.
Using the above examples:

Assume Case A brings after-tax income of $80 per year, forever.
Assume Case B brings after-tax income of $144 per year, forever.
Value of firm = after-tax income /, therefore
Value of firm in Case A: $80/0.08 = $1,000
Value of firm in Case B: $144/0.08 = $1,800
Increase in firm value due to borrowing: $1,800 – $1,000 = $800
Alternatively, debt x tax rate: $4,000 x 20% = $800;