In 2016 ASEC (but not 2012-2015 surveys) some observations with SPMPOV=1 have SPMTOTRES>SPMTHRESH. This doesn’t seem to be a rounding issue because in one case total resources are almost 5% above the threshold. What am I doing wrong?
Why are some observations classified as SPM poor even though SPM resources are greater than SPM poverty threshold?
You are not doing anything wrong. Actually the Census Bureau has recently released a new version of the SPM variables for 2016, which fixes the issues you highlight. These revisions will be reflected in the next IPUMS CPS data release.