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only the pension should be in Box 4a and should reflect what is in Box 1 of the 1099-R. For each pension 1099-R, can you please post what is in Box 7 and whether the IRA / SEP box is checked.
Box 4b should reflect all the 1099-Rs, summing what is in Box 2a. For each remaining 1099-R, can you please post what is in Box 7 and whether the IRA / SEP box is checked.
is there anything unusual about these 1099-Rs? meaning are they outside a pension payment or a distribution from an IRA?
agree that the 'taxable amount not determined' should have no relevance
thx
