Microsoft Corp., the world’s biggest software maker, plans a benchmark sale of bonds a day after its board approved to sell as much as $6 billion in additional debt.

Proceeds may be used to fund working capital, capital expenditures, stock buybacks and acquisitions, the Redmond, Washington-based company said today in a regulatory filing that didn’t disclose the size or timing of the sale. The bonds may be sold as soon as today, a person familiar with the transaction said, who declined to be identified as terms aren’t set.