Earlier quoted context omitted.
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This claim is not correct in several ways. The $80B was not earmarked for hiring agents; that was an additional $80B for the entire agency spread over 10 years. While some of that money might be used to hire additional agents, it will also be used to upgrade old technology (the IRS still uses software from the 1950s), make fixed capital investments that have been long-deferred, regulate third-party tax preparers, pro…
But the broader issue seems to be that the IRS is really bad at planning, goal-setting, and managing its development lifecycle [1]. They've burned through $5.9B just on modernization projects since 1998, with very little to show for it. Many of those projects, including replacing IMF and CADE (which was supposed to be the modern system that would replace IMF, but which failed), have been paused indefinitely. Clearly replacing these legacy systems is time-consuming work, but any way you look at it, it should not take 30 years (that's how long it would have taken if they accomplish their current goal of retiring the IMF by 2028).
It's not just that development is slow; this is holding back IRS from operating efficiently. IRS employees reportedly have more than a hundred internal applications they have to be trained in and switch between in order to accomplish basic tasks, and they have a huge backlog.