I think the most meaningful number is the percentage of gross. Percent of AGI is not that meaningful. For instance, someone could have significantly different AGI just by putting 10K in traditional IRA (5K per spouse), versus putting the same 10K in 401k. To me this is not a meaningful distinction, but it would have a big influence on effective tax rate using AGI.
EDIT: My mistake, AGI is after IRA contributions, so the AGI number is meaningful.
EDIT: My mistake, AGI is after IRA contributions, so the AGI number is meaningful.

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