Correction

In an article about tax-free municipal bonds that appeared Jan. 17, the Monitor incorrectly stated that, starting this month, the government requires money market funds, brokerage houses, banks, and thrifts to withhold 10 percent of the interest investors earn on their money. Actually, withholding 10 percent on interest and divident income over $150 will begin in July, not January. The Monitor regrets the error.