retirement income

Are you asking about the taxability of Social Security Income after retirement? 

According to the SSA, your benefits can be taxed in certain situations (below):

This usually happens only if you have other substantial income in addition to your benefits (such as wages, self-employment, interest, dividends, and other taxable income that must be reported on your tax return).

You will pay tax on only 85 percent of your Social Security benefits, based on Internal Revenue Service (IRS) rules. If you:

• file a federal tax return as an "individual" and your combined income* is
  • between $25,000 and $34,000, you may have to pay income tax on up to 50 percent of your benefits.
  • more than $34,000, up to 85 percent of your benefits may be taxable.
• file a joint return, and you and your spouse have a combined income* that is
  • between $32,000 and $44,000, you may have to pay income tax on up to 50 percent of your benefits.
  • more than $44,000, up to 85 percent of your benefits may be taxable.

There are 2 different things to know about social security. People get them mixed up all the time.

1. Your actual SS checks

If you are over full retirement age your actual ss checks won't be reduced. Otherwise they will actually reduce your payments if you make too much other income in the prior year.  See SS FAQ for working after retirement

https://www.ssa.gov/planners/retire/whileworking.html

2. Income Tax

For any age up to 85% of Social Security becomes taxable when ALL your other income plus 1/2 your social security reaches:

Married Filing Jointly: $32,000

Single or head of household: $25,000

Married Filing Separately: 0