The GOP's 2017 tax law—the biggest change in the US tax code in three decades—left a mammoth task for the IRS and Treasury Department.

It resulted in the Treasury and a severely underfunded IRS creating the blueprint for taxpayers and tax practitioners trying to follow the law, releasing over 200 pieces of formal guidance and more than 300 pieces of informal guidance.

Many of these provisions are set to expire next year and face an uncertain fate as the November election approaches with control of the House and Senate in play.

Dave Kautter, a partner at RSM US LLP, spoke with Bloomberg Tax reporter Erin Slowey on his time as the Department of Treasury's assistant secretary for tax policy and acting IRS commissioner during that major tax code overhaul. He also spoke about the agencies' role in policy making and how they can prepare for changes in 2025—if at all.

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