Watchdog: Auditing the rich could earn the IRS $4,545 per hour

Who qualifies as "high income" in the U.S. might be changing after an audit found the IRS isn't focusing enough resources on the super rich.

The report from a Treasury Department agency dedicated to IRS oversight shows every audit hour of people making $5 million or more nets the government $4,545. Every hour dedicated to someone making in the $200,000-$400,000 range? Just $605 an hour.

SEE MORE: 10 tax form terms you could be confusing

That in itself isn't terribly surprising. More income means more possible money missed. And the report's own intro even says high-income taxpayers are more likely to be involved in complex financial arrangements with "aggressive tax planning."

But here's the thing. Audits are at their lowest rate in a decade and have been declining steadily for the last four years straight. And guess which tax brackets saw the biggest drop-off in audits — the top three.

The report also seemed to indicate a somewhat arbitrary system, stating, "It is not clear that the IRS audits the most productive high-income taxpayer cases or that it has a clear rationale for the inventory balance it has established among taxpayers at different (income) levels."

Ultimately, the report recommended several changes, including that the IRS consider changing income thresholds and what the agency considers "high income."

See each 2016 candidate's views on taxes:

More from AOL.com:
E. coli outbreak linked to Chipotle expands to 6 states
The most resilient housing markets in America
Dorsey's Square jumps in market debut, offering hope to startups