Lump-Sum Distribution

A lump-sum distribution, as the IRS defines it (IRC section 402(e)(4)(D)), is a distribution of your entire balance under an employer's plan within a single tax year, made after a qualifying triggering event. For most people the definition matters for exactly one reason: it is the gateway requirement for the Net Unrealized Appreciation (NUA) tax election on employer stock.

There are four triggering events: separation from service, reaching age 59½, death, and disability. Two of them are role-specific — separation from service counts only for common-law employees, and disability (as defined in IRC section 72(m)(7)) counts only for self-employed individuals. A regular employee who becomes disabled qualifies through separation from service or age 59½ instead, not through the disability trigger.

The 'entire balance in one tax year' requirement is strict. All of the employer's plans of the same type are aggregated — every dollar across them must leave by December 31 of the distribution year. Leaving even a small residual balance behind at year-end spoils lump-sum status, and with it the NUA election.

The order of operations also matters. Taking a partial withdrawal after your triggering event — an 'intervening distribution' — can disqualify a later lump-sum for NUA purposes until a new triggering event occurs. The classic mistake: leave a job, take a small cash withdrawal the next year, then try to elect NUA. The partial withdrawal broke the chain; now the next available trigger may be age 59½.

If you hold appreciated employer stock in your 401(k), plan the whole exit as one event in one calendar year: employer stock distributed in-kind to a taxable brokerage account (electing NUA), everything else direct-rolled to an IRA. A lump-sum distribution paid out to you personally, rather than split this way, is an eligible rollover distribution — subject to the 20% mandatory withholding on the non-stock portion.