Source: U.S. Department of the Treasury. Internal Revenue Service  

Release: SOI Tax Stats - Historical Data Tables  

Units:  Number of Returns, Not Seasonally Adjusted

Frequency:  Annual

Taxable interest includes "dividends" on deposits and withdrawable shares in mutual savings banks, savings and loan associations, and credit unions, but excludes interest from Regulated Investment Companies on money market mutual funds, which is included in "ordinary dividends" in "adjusted gross income" (AGI).

For additional information about the return filing requirements, see the annual reports, Statistics of Income-Individual Income Tax Returns at https://www.irs.gov/uac/soi-tax-stats-historical-data-tables.