How would this work?
If the regular catch-up contribution limit at the time is $9,000, and the indexed special catch-up contribution limit (for ages 60 – 63) is $11,500, a 60-year-old participant could contribute $13,500 to the plan.
Here’s the math:
Regular catch-up contribution:
$9,000 x 1.5 = $13,500
OR Ages 60-63 catch-up contribution: $11,500