"now if I amend"
If you filed and took a deduction for your $6,500 don't bother to amend it won't help you
If you did not take a deduction, then when you amend file Form 8606 with $6,500 on Line 1
( you do this by telling TurboTax you want to elect non-deductible )
That will give you a refund of the tax on the $6,500.
@dhannum
@dhannum
