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:
The difference between face value of a bond and lower market price, attributable to rising interest rates. On a sale, gain on the bond is generally taxed as ordinary income to the extent of the discount.