Yeah it’s definitely an apples to oranges comparison, especially since the CRA does tax (federal and provincial/territorial) as well as benefits, while all the others are just federal tax. And agreed the IRS is way underfunded and understaffed.
I went on a bit of a deep dive and looked at the CRAs report cards and departmental plans. Lots of neat information there for 2022-23 fiscal year (not sure why that was in a plan for next year, but interesting stats nonetheless)
$379B in tax revenue (85% of government annual revenue)
$639B in revenue and pensions administered
$46.4B in benefits to Canadians
$89.1B of tax debt resolved
$13.1B actual spending
There was also a tidbit about tax cheats specifically, and $14.3B coming from that alone, which is $1.2B more brought in, than they spent. Not bad.
As a result, the CRA has increased its ability to identify and target aggressive tax planning, and increased the volume of its gross audit reassessments. A total of 62,660 audits, excluding all other compliance interventions were completed in 2022–23 which had a fiscal impact of $14.3 billion.