We can file this under "too much time on my hands", but I wondered if I could make better than a simple guess at what the 1099-OID will say for cusip 912828GX2 (10 year TIPS bond 2.625%), when it's posted in January.
For 2013, 2014, and 2015, the OID has been $270.75, $468.75, and $47.00, respectively.
I don't think it has to do with market value, but you can look it up at https://www.treasurydirect.gov/GA-FI...yPriceDate.htm
and put in a date, then search for "GX2". It looks like I paid $25,845 at the Treasury Auction (250 units, so 103.38 per hundred) back on 10/15/2007.
I'm almost certain it would be complicated to calculate, and the data to support the calculation not easily available, but I figured, eh, what the heck, I'll ask....maybe it's easier than I think.