Before the 2017 Tax Cuts and Jobs Act and the subsequent years of reduced IRS funding, the net uncollected tax amount"known as the net tax gap"was estimated at roughly $381 billion per year (based on data from 2011"2013).

Based on IRS projections released in early 2026, the gross federal tax gap for 2022-2024 is estimated at $696 billion annually, with a projected net tax gap of $606 billion after late payments and enforcement actions. This represents taxes owed but not paid on time, largely driven by $539 billion in underreporting.

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