Money leaving one retirement account for another follows one of two mechanically distinct routes. The difference determines what paperwork exists and what deadlines apply.
The direct route between institutions
In a direct rollover, the distributing plan or custodian sends the assets to the receiving institution. The account holder never takes possession of the funds.
Payment is made payable to the receiving custodian for the benefit of the account holder, which is why a check issued this way cannot simply be deposited into a personal account.
Because the money never becomes the individual's to spend, mandatory withholding does not apply and no deadline clock starts running.
The indirect route and its clock
An indirect rollover distributes funds to the account holder, who must deposit them into another qualifying account within a defined window, generally sixty days.
Distributions from employer plans eligible for rollover are subject to mandatory federal withholding, meaning the amount received is smaller than the amount distributed.
To complete a full rollover the account holder must replace the withheld portion from other money. Failing to do so leaves that portion treated as distributed.
Why transfers differ from rollovers
Movement between two accounts of the same type at different custodians is often processed as a trustee to trustee transfer, which is not treated as a distribution at all.
Transfers are not reported as rollovers and are not subject to the frequency limitation that applies to indirect rollovers between individual retirement accounts.
Institutions use the terms loosely in marketing, so the paperwork submitted determines the treatment rather than the label used in a conversation.
In kind versus liquidated movement
Assets can sometimes move in kind, with securities transferred as they are, or be liquidated to cash first and reinvested at the receiving institution.
Employer plans commonly distribute cash because the plan's investment options do not exist outside the plan. Brokerage accounts more often support in kind movement.
Liquidation creates a period out of the market between sale and reinvestment, a mechanical consequence of the transfer process rather than a decision by either party.
Reporting that arrives afterward
The distributing institution reports the distribution to tax authorities, and the receiving institution separately reports the rollover contribution it accepted.
Those two filings are how the movement is matched. A direct rollover still generates a distribution form, which surprises people who assumed a non-taxable move produced no paperwork.
Employer stock, after-tax contributions and designated accounts each carry additional reporting details, which is why the forms are worth reading rather than filing unopened.