The rollover from the traditional TIAA 401(k) to a traditional rollover IRA at Fidelity and a subsequent Roth conversion from the rollover IRA requires two Forms 1099-R, one from TIAA (likely code G) and one from Fidelity (code 2 or code 7).
The rollover from the traditional Fidelity 401(k) directly to a Roth IRA requires a third Form 1099-R (code G).
You marginal tax rate on a particular amount of taxable income is simply the increase in your tax liability divided by the amount of this particular amount of taxable income, when there are no other changes to the items reported on your tax return.
