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The taxable portion of your Roth IRA distribution will only be the earnings. The contributions you have put into the Roth are not taxable income based on what you have already said. When completing your income tax return, you will need to complete Form 8606 to show the distribution from your Roth and the contributions from prior years that make up your basis in the Roth. This gross distribution from the 1099-R will go on line 15a of the 1040 and 15b will be where you enter the taxable portion of the IRA. Most of the 1099-Rs that I see for Roth distributions do not have an amount in box 2 because the issuer does not know how much is taxable.
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When you say past contributions do you mean use the tax forms(5498) sent to me each year from the payer showing my contributions since the inception (when I began contributing toward my roth ira. Then subtract that amount from the distribution and place the remainder amount in line 15B. Then that is the taxable amount. Am I correct?
Yes. The 5498 in box 10 shows the Roth IRA contributions for the tax year. Your thinking is correct. You deduct your contributions from the total distribution and this is the amount of earnings you put on line 15b. Keep in mind this taxable amount will also be subject to the 10% penalty unless there is an exception. Complete Form 5329 to figure the 10% penalty and report any exceptions.