A temporary assignment normally keeps you on home payroll and benefits with an agreed return, and often carries allowances that a transfer does not. A permanent transfer moves you onto local payroll, local benefits and local employment law, and there is usually no return right. The distinction decides pension continuity, notice protections and whether the old role still exists.
The difference that decides everything
One keeps you on the home payroll with a way back. The other ends your old job and starts a new one somewhere else. They get described with overlapping language and they are not remotely the same arrangement.
A temporary assignment has a return date and an old job waiting at the end of it. A permanent transfer ends the old job outright and moves you onto local payroll, local benefits and local employment law. Everything else follows from that single distinction: tax treatment, allowances, and what happens if it goes badly.
Which means the first thing to establish is not the money at all. It is whether your current role is being held, by whom, and until when. Ask that before you ask what the package contains, because the answer determines which package you should be asking about.
What a temporary assignment usually carries
Housing at the assignment location, travel home at a stated frequency, and often a per diem for daily costs. Sometimes a completion bonus paid at the end rather than spread through the assignment, which is a retention device as much as a reward.
Crucially, your base pay usually does not change at all, because you have not changed jobs. The allowances sit on top of it and they stop when the assignment does. That is the thing to plan around, because a lifestyle built on a per diem does not survive the return home and the adjustment can be genuinely painful.
The tax rule that turns an allowance into wages
Travel-related allowances can be paid free of tax while an assignment is genuinely temporary, which for federal purposes generally means expected to last one year or less. Once an assignment is expected to exceed a year, the assignment location becomes your tax home. At that point those payments become taxable wages.
The trigger is the expectation rather than the outcome, which catches people out repeatedly. An assignment expected from the start to run eighteen months is taxable from the first day. One expected to run ten months and later extended becomes taxable from the point the expectation changed. Get the expected duration stated in writing, and get any extension formally re-papered rather than allowed to drift.
What a permanent transfer carries instead
A relocation package rather than a per diem, and usually a re-band of your pay to the new location. The allowances are one-off and the pay change is permanent, which is the reverse of the assignment structure.
So a transfer to a cheaper location can be a pay cut with a relocation package attached, and it will never be described in those terms. The relocation figure is large and visible while the re-band is a smaller number in a different document. Ask for the new base in writing before agreeing in principle to anything at all.
The return that does not exist
The most common bad outcome in a temporary assignment is that the role you were meant to return to has been filled, reorganized or eliminated by the time you get back. Nobody plans for this and it happens constantly, because eighteen months is a long time in most organizations.
Ask directly what happens if your old role no longer exists on your return date. A good answer names a person accountable for placing you and a defined period to do it in. A vague answer is itself the answer, and you should treat the arrangement as a transfer that has not been labeled one.
What to settle before either
Four unglamorous things decide how the assignment actually goes. Who your manager is while you are away and who writes your review. How the assignment gets treated in promotion decisions made in your absence. Whether a completion bonus survives a company-initiated early end. And what happens if you want to come back early.
These are where assignments go wrong, and they are consistently the least discussed part of the package. Pay is usually the part that has been thought through carefully by somebody. Accountability for your career while you are on the other side of the world usually has not been thought through by anybody.
A worked comparison
Two offers to the same person. An eighteen-month assignment with $3,000 a month in housing plus a per diem, with base unchanged at $110,000. Or a permanent transfer with a $25,000 relocation package and a re-band up to $118,000.
The assignment looks considerably larger at first glance, with roughly $36,000 a year in allowances against an $8,000 raise. But at eighteen months those allowances are taxable from day one, they stop entirely at the end, and the base that every future raise compounds from has not moved at all. The transfer raises the number that follows you for the rest of your career.
Which is better depends entirely on whether you want to be in the new location afterwards. If you do, the transfer wins on almost any horizon beyond three years. If you do not, the assignment is the one that lets you leave without another negotiation.
Benefits and pension continuity
An assignment normally keeps you on the home benefits plan, which means your pension accrual and health coverage carry on uninterrupted. A transfer usually moves you onto local benefits, and the two can differ enormously in value and in structure. That difference rarely gets priced during the conversation about salary.
Ask specifically what happens to your retirement arrangement under each option. Some transfers pause home contributions entirely, which creates a gap in an account that compounds for decades afterwards. Ask what health coverage applies, when it starts, and whether any pre-existing condition is treated differently under the local plan. Those answers can be worth more than the difference in base pay between the two offers.
The question that clarifies it
Ask what happens on the last day. If the answer is that you come back to your job, it is an assignment and it should be papered as one with a named return role. If the answer is that you simply carry on, it is a transfer with a temporary label attached to it.
Labels drift toward whichever arrangement is cheaper to administer, and that drift is rarely deliberate. The end date is the fact that settles which one you are actually being offered. Everything else in the conversation is downstream of it.
Common questions
What is the difference between an assignment and a transfer?
An assignment has a return date and an old job held for you. A transfer ends the old job. Tax treatment, allowances and what happens if it fails all follow from that.
Does my base pay change on a temporary assignment?
Usually not, because you have not changed jobs. Allowances sit on top and stop when the assignment does — which is what to plan around.
When do travel allowances become taxable?
Broadly when the assignment is expected to exceed one year. The trigger is expectation, not outcome, so an eighteen-month assignment is taxable from the start.
What if my assignment gets extended?
It can become taxable from the point the expectation changes. Get extensions re-papered rather than allowed to drift.
What is the most common thing that goes wrong?
The role you were meant to return to has been filled, reorganized or eliminated. Ask who is accountable for placement if that happens, and by when.
Is a transfer to a cheaper location a pay cut?
Often, because transfers usually re-band pay to the new location. It will not be described that way — ask for the new base in writing first.
Which is worth more financially?
Allowances usually look larger, but they are temporary and taxable beyond a year, and base is what compounds. A transfer wins over any long horizon if you want to stay.
What should I settle besides pay?
Who writes your review, how the assignment counts in promotions, whether the completion bonus survives an early company-initiated end, and what happens if you want to return early.