Not only are SS benefits being taxed, but a greater percentage of benefits are being taxed every year. It's really a raw deal for SS benefit recipients.
Social Security after-tax "net" benefits are already being "cut" and have been for years, but most people aren't aware of how this is being done.
The SS formula for determining how much of your SS benefits are taxed is NOT indexed to inflation, so that threshold has not increased since it was first introduced in 1983. For a single person, if your income combined with half your SS benefits exceeds $25,000, you have to pay income tax on up to 50% of your SS benefits. If it exceeds $34,000, you have to pay income tax on up to 85% of your SS benefits. $25K in 1983 is worth a lot more than $25K in 2018. Since your retirement distributions and SS benefits will be adjusted with inflation, but NOT the $25,000/$34,000 thresholds, a greater percentage of your SS benefits will become taxable as each year passes (for married filing jointly, the thresholds are $32,000/$44,000.) It's a built-in tax increase, reducing "net" SS benefits, hurting seniors further. The greater your combined income and SS/2, the more you will be affected by this up to a max of 85% of your benefits being taxed! It's absurd, and those thresholds should be increased to reflect inflation since 1983.
The ways it is, you should play it safe by estimating that 85% of your SS benefits well into the future will be taxable. More information about this can be found in these references:
https://www.fool.com/retirement/gen...ear-old-social-security-rule-is-wreaking.aspx
http://www.foxnews.com/story/2007/03/25/double-whammy-taxation-social-security-benefits.html
https://www.ssa.gov/policy/docs/issuepapers/ip2015-02.html