401(k) 20% rollover withholding
If a plan pays an eligible rollover distribution to you instead of another trustee, IRC 3405(c) requires 20% federal withholding.
Withheld = distribution × 20% (or $0 if direct rollover)
Example: $50,000 paid to you → $10,000 withheld, $40,000 check. To complete a 60-day rollover of the full $50,000 you add $10,000 from other funds.
Related: paycheck take-home, 401(k) remaining room.
Educational estimate, not tax advice.