According to a Treasury report (https://home.treasury.gov/system/files/136/The-American-Families-Plan-Tax-Compliance-Agenda.pdf), the tax gap, which is the spread between what the federal government collects in taxes and what it thinks it should be collecting, continues to grow. The tax gap is now estimated to be $584 billion, which is about 3% of GDP each year in owed but uncollected taxes. The tax gap could rise to $7 trillion over the next decade if it isn’t addressed.
The tax gap results from:
The Treasury suggested several ways to increase tax compliance:
Shifting income to a later year, such as where you defer taxable interest to the following year by purchasing a T-bill or savings certificate maturing after the end of the current year. Investments in qualified retirement plans provide tax deferral.