In one word, taxes:
What a crazy world. Apple, a company with $145 billion of cash, is issuing some $17 billion of debt to buy back its own shares. Why doesn’t it just use its cash to do the same thing? First, because a lot of that cash is overseas, and bringing it back to America would incur a tax charge. Second, because interest rates are low and debt interest is tax-deductible, making this look a great arbitrage.
But think of it from the point of view of the hard-working American taxpayer. Apple’s money will still sit overseas and not be invested at home to create jobs. Apple’s tax bill will fall, as it offsets the interest payments against its profits. The buy-back will probably push up the share price in the short term, boosting the value of executive options; profits from those options will probably be taxed at the long-term capital gains tax rate of 15%, lower than the rate many workers pay. Organising a bond issue, rather than using a company’s own cash, incurs costs in the form of fees to bankers on Wall Street; the same bankers taxpayers helped support five years ago.