Incomes dropped 0.1 percent in August, after rising 0.4 percent in April, 0.3 percent in May, 0.2 percent in June and 0.1 percent in July.
Consumer spending, often cited as representing 70 percent of the nation's gross domestic product, rose 0.2 percent in August after rising 0.7 percent in July.
Real dollars highlight the difference. In July, spending rose by $88.4 billion. In August it rose by $22.7 billion.
Incomes in August fell by $7.3 billion, a radical swing south from the $17.1 billion consumers added to their incomes in July.
Data on disposable income has also formed a steady progression, rising 0.3 percent in April, 0.2 percent in May, 0.1 percent in June and July, and falling flat in August.
In August, core prices, which exclude energy and food prices, rose 0.1 percent after rising 0.2 percent in July. For all items, prices rose 0.2 percent, compared with 0.4 percent in July.