26 C.F.R. § 1.402(a)(5)-1T
Q-1: Can an employee or the surviving spouse of a deceased employee roll over to an individual retirement account or annuity, described in section 408 (a) or (b), the taxable portion of a partial distribution from a qualifiedtrust described in section 401(a), a qualified plan described in section 403(a), or a tax-sheltered annuity contract under section 403(b)?
A-1: Yes. For distributions made after July 18, 1984, the taxable portion of a partial distribution may be rolled over within 60 days of the distribution to an individual retirement account or annuity.
Q-2: Are there special requirements applicable to rollovers of partial distributions?
A-2: Yes. Section 402(a)(5)(D)(i) specifies that no part of a partial distribution may be rolled over unless the distribution is equal to at least 50 percent of the balance to the credit of the employee in the contract or plan immediately before the distribution, and the distribution is not one of a series of periodic payments. For purposes of this section, the balance to the credit of an employee does not include any accumulated deductible employee contributions (within the meaning of section 72(o)). In addition, in calculating the balance to the credit for purposes of the 50 percent test, qualified plans are not to be aggregated with other qualified plans and tax-sheltered annuity contracts are not to be aggregated with other tax-sheltered annuity contracts. Also, in applying the 50 percent test to a surviving spouse, the balance to the credit is the maximum amount the spouse is entitled to receive under the plan or contract, rather than the total balance to the credit of the employee. The rollover of a partial distribution may result in adverse tax consequences; see section 402(a)(5)(D) (iii) and (iv).
Q-3: Are there any other requirements applicable to rollovers of partial distribution?
A-3: Yes. Section 402(a)(5)(D)(i)(III) requires the employee to elect, in conformance with Treasury regulations, to treat a contribution of a partial distribution to an IRA as a rollover contribution. An election is made by designating, in writing, to the trustee or issuer of the IRA at the time of the contribution that the contribution is to be treated as a rollover contribution. This requirement of a written designation to the trustee or issuer of the IRA is effective for contributions paid to the trustee or issuer of the IRA after March 20, 1986. For contributions paid to the trustee or issuer before March 21, 1986, an election is made by computing the individual's income tax liability on the income tax return for the taxable year in which the distribution occurs in a manner consistent with not including the distribution (or portion thereof) in gross income. Both such elections are irrevocable, except that an election made on an income tax return filed before March 21, 1986 is revocable.
Q-4: Does the election requirement apply to rollovers of qualified total distributions or rollover contributions described in section 402(a) (5) or (7), 403(a)(4), 403(b)(8), 405(d)(3), or 408(d)(3) to individual retirement accounts and annuities (IRAs)?
A-4: Yes. No amounts may be treated as a rollover contribution to an IRA under section 402(a)(5), 402(a)(7), 403(a)(4), 403(b)(8), 405(d)(3) (as amended by section 491(c) of the TRA of 1984), or 408(d)(3) unless the requirements described in Q & A-3 of this section are satisfied. Thus, once any portion of a total distribution is irrevocably designated as a rollover contribution, such distribution is not taxable under section 402 or 403 and, therefore, is not eligible for the special capital gains and separate tax treatment under section 402 (a) and (e). Election requirements for rollover contributions to IRAs described in this Q &A-4 are subject to the same effective date rules set forth in Q &A-3.
26 C.F.R. §1.402(a)(5)-1T