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- Apr 14, 2006
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My understanding as well. Once you exceed $32k combined income, each dollar results in taxation of 50 cents of SS. So at 44k combined income (for MFJ) $6K of SS is subject to taxation. Past $44k, each increased dollar results in taxation of 85 cents of social security until you get to the maximum of 85% of the total.Yes, I agree, and that's what I'm talking about. The extra $1 can have a large marginal rate, but it's not going to cost you more than that $1
So, assume you are just 1 cent below the $32K combined income. Your actual income is $36k in SS and $14k in other income (assume a pension). You take the standard deduction of $24k. Your taxable income is zero and you owe no tax on $50k actual gross income.
Let's look at three withdrawal scenarios
1. ) Same as base case but you withdraw $9K from your IRA, putting you over the combined income test by $9k. Each dollar of income over $32k subjects 50 cents of SS to tax. So, your AGI is (50% of ($39k - $32k)) +$14k pension + $9k IRA withdrawal = $26,500. You take the $24k standard deduction, so your taxable income is $2500 and you are in the 10% bracket. Your tax is $250.
2.) Same as base case, but now assume you take $12k from your IRA/401K, reaching the top of the SS taxation phase in band. Your AGI now equals (50% of $12k) + 14k pension + $12k IRA withdrawal = $32k. You take the $24k standard deduction, so your taxable income is $8k. You are in the 10% marginal bracket and you pay $800 in tax.
3.) Same as base case, but now you take $20k from your IRA. Now, $6k of your SS plus 85% of the amount over $44k combined income is subject to tax, up to the maximum of $30,500, which is 85% of $36k). So your AGI is (50% of 12K +85% of $8k) + $14k pension + $20k IRA withdrawal = $46,500. With a $24k deduction, your taxable income is $22.5k. Your tax will be $2319.
In this scenario, you will actually reach maximum taxation of social security when you withdraw a total of $40,941.18 from your IRA. (50% of $12000 + 85% of $28,941.12 = $30600). At that point, your AGI will be $30.6k SS + $14k pension + $40,941 IRA withdrawal = $85541. With a standard deduction, your taxable income will be $61,541 and you will be in the 12% bracket. Your taxes will be $7004.
From this point on, there is no difference to the taxation of a marginal withdrawn dollar. For comparison, now assume SS taxation suddenly went away. Your AGI is reduced by $30,600 and your tax by $3672. That is the maximum affect of the SS add in.
Obviously, there will be slight variations depending on the actual SS received, but you should get the picture that it is a limited dollar impact.
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