[Official Guidance]

Text of IRS Announcement 2014-32: Application of One-Per-Year Limit on IRA Rollovers (PDF)
"This announcement is intended to address certain concerns that have arisen since the release of Announcement 2014-15. The IRS will apply the Bobrow interpretation of Section 408(d)(3)(B) for distributions that occur on or after January 1, 2015. This means that an individual receiving an IRA distribution on or after January 1, 2015, cannot roll over any portion of the distribution into an IRA if the individual has received a distribution from any IRA in the preceding 1-year period that was rolled over into an IRA. However, as a transition rule for distributions in 2015, a distribution occurring in 2014 that was rolled over is disregarded for purposes of determining whether a 2015 distribution can be rolled over under Section 408(d)(3)(A)(i), provided that the 2015 distribution is from a different IRA that neither made nor received the 2014 distribution. In other words, the Bobrow aggregation rule, which takes into account all distributions and rollovers among an individual's IRAs, will apply to distributions from different IRAs only if each of the distributions occurs after 2014.... [A] rollover between an individual's Roth IRAs would preclude a separate rollover within the 1-year period between the individual's traditional IRAs, and vice versa.... The one-rollover-per-year limitation also does not apply to a rollover to or from a qualified plan (and such a rollover is disregarded in applying the one-rollover-per-year limitation to other rollovers), nor does it apply to trustee-to-otrustee transfers.... IRA trustees are encouraged to offer IRA owners requesting a distribution for rollover the option of a trustee-to-trustee transfer from one IRA to another IRA." (Internal Revenue Service [IRS])  

[Guidance Overview]

IRS Clarifies Application of One-Per-Year Limit on IRA Rollovers, Allows Owners of Multiple IRAs a Fresh Start in 2015 (PDF)
"In Announcement 2014-32, posted [November 10, 2014] the IRS made clear that the new interpretation will apply beginning Jan. 1, 2015, and said that a distribution from an IRA received during 2014 and properly rolled over (normally within 60 days) to another IRA, will have no impact on any distributions and rollovers during 2015 involving any other IRAs owned by the same individual. This will give IRA owners a fresh start in 2015 when applying the one-per-year rollover limit to multiple IRAs. Although an eligible IRA distribution received on or after Jan. 1, 2015 and properly rolled over to another IRA will still get tax-free treatment, subsequent distributions from any of the individual's IRAs (including traditional and Roth IRAs) received within one year after that distribution will not get tax-free rollover treatment. As [this] guidance makes clear, a rollover between an individual's Roth IRAs will preclude a separate tax-free rollover within the 1-year period between the individual's traditional IRAs, and vice versa." (Internal Revenue Service [IRS])