How much of my social security income do I report to the IRS?

All of it on line 20a, then he taxable amount on 20b. There's a worksheet to calculate how much is taxable. See https://www.irs.gov/pub/irs-pdf/p915.pdf page 7.

You report all of your social security, but not all of it is taxable. If you income level is high enough as much as 85% may be taxable but for many people none of it is. If you are using a computer tax program the software will figure it out for you. Otherwise you are going to need some worksheets from IRS publications.

If you received an SSA-1099, you report all of it.

There are TWO boxes on the tax form. The A box is 100% of the money; the B box is the taxable portion. See the instructions for the 1040A or 1040 for the calculation.

you enter all of it on the tax form, if you are using a tax program the amount that can be taxable will be entered on the appropriate line

if you are doing your own you will need to follow the ss worksheet to determine how much is taxable

You enter yot SSA-1099 data into your tax software and let it worry about what to do with it.

If you file a return all of it. May or may not be taxable, but you report it all.

All of it.

READ THE ******* 1040 INSRUCTIONS.

All of it.