I have noticed all this year that the reference room has not been updated with any 2018 information. I have been a follower on this site for many years and this appears to be the first year no updated information has been posted. Any particular reason for that? Tom D.
We’ll post 2018 and 2019 when the IRS releases 2019.
In the past, we were able to calculate these figures on our own spreadsheet, post them, and then confirm them later when the IRS got their numbers out. The switch to chained CPI makes it difficult to know which figures to use, because chained CPI figures are subject to adjustment for a period of time after they are first published.