Great catch, Todd1580! I see they've made the correction you requested, too.

I called QB support and they confirmed that if I use the new categories, the new contributions will be added to the original on the W-2s.

Since our company has three pay periods left in 2024, we're going to use a contribution rate of $650 for those remaining pay periods to meet the $1,950 difference between the original limit of $19,500 and the new limit of $21,450. (For those in the SIMPLE IRA Catch-up Higher Limit category.)