Phantom stock and stock appreciation rights (SARs) are forms of compensation that mimic equity without giving the employee actual shares: when they pay out, the employee receives cash equal to the value of shares or the appreciation in share value since the grant date. That cash payment is taxable as ordinary income in the year it is received, not when the award is granted or when it vests. For US expats, the income may be allocable between countries based on the portion of the vesting period spent working in each location, following the same allocation principles that apply to RSUs. If part of the income is allocated to days worked in a foreign country where you also paid foreign income tax, the Foreign Tax Credit may be available to offset the corresponding US tax on that portion. Both phantom stock and SARs can also be subject to the Section 409A deferred compensation rules, which impose a 20% excise tax plus interest charges on arrangements that do not meet strict payment timing requirements, so the plan document terms matter as much as the tax planning.