Here's when the Social Security cost-of-living increase goes into effect

Senior citizens and others who receive Social Security checks will soon see a 5.9% increase in their monthly payments, the biggest annual "raise" since 1982. But experts warn that the boost may not be enough to offset fast-rising inflation. 

The cost-of-living adjustment, or COLA, goes into effect with the December benefits, but those will be paid in January. The payment dates are determined by the recipient's birthdate: