Clarify SSA tax projection for next year

Need to clarify what I've understood so far while trying to project tax due next year.

Married, filing jointly

Annual Combined SSA income: $ 45612.00

Annual Husbands Pension: $ 553.00

IRA Estimated Withdrawal: $13500.00

1/2 of SSA = $ 22806.00

Add pension:    $ 553.00

Total:              $ 23359.00

Adding IRA W/D: $ 13500.00

Total:               $ 36859.00

MFJ=$ 32,000.00 to equal 50% tax on SS income

So we would be taxed on $ 4,859.00.  

Is this correct?

Thank you,