Can a 1099-R create more tax on an existing Social Security benefit?

[dmnoonan]

Son passed away.  Received 2 1099-Rs as his beneficiary.  20% FIT withheld.  Have an annual social security benefit of around $22K.  Owe more for the 1099s AND tax on the SS that last year I did not.

[MichaelL1]

Yes, a 1099R will increase your taxable income by the amount that is taxed on the 1099R.

Up to 85% of the Social Security can be subject to tax, and it depends on the other income on the return.

Yes, this is correct what is happening on your return.  TurboTax does these computations for you.

So sorry for your loss.

Please see the detail below on how it determined how much Social Security can be taxed.

https://ttlc.intuit.com/replies/3299920