Do I have to pay taxes on my social security income? I worked until december 2019 and then retired. paid tax on income plus all social security income?

Yes, you may have to pay taxes on your Social Security income.  It all depends on your other income and your filing status.

Here is a link to the Social Security Administration web site that will give you some good information about what amount of your Social Security benefits may be taxable:  Benefits Planner - Income Taxes and your Social Security Benefit

First, take a look at your Adjusted Gross Income (AGI) on your return.  Add your AGI and any non-taxable interest and one-half of your Social Security.  This is your combined income.  

If your filing status is Single or Head of Household and your combined income is:

• Less than $25,000 then none of your Social Security is taxable
• Between $25,000 and $34,000 then up to 50% is taxable
• Greater than $34,000 then up to 85% is taxable

If your filing status is Married Filing Joint and your combined income is:

• Less than $32,000 the none of your Social Security is taxable
• Between $32,000 and $44,000 then up to 50% is taxable
• Greater than $44,000 then up to 85% is taxable

If your filing status is Married Filing Separate, then your Social Security is taxable.

If your benefits included a lump sum payment for prior years, then the calculation is much more complicated than stated here.  

@ctlmarti