Meaning
Proportionate time allocation methods apportion equity compensation income between multiple tax jurisdictions based on physical performance locations during vesting periods. Tax authorities apply a workday sourcing fraction to determine the precise ratio of locally taxable employment gain relative to total global services rendered. The numerator measures physical working days spent inside the taxing jurisdiction between grant and vest dates, while the denominator measures total workdays worked worldwide over the same timeframe.
Equity compensation granted to mobile cross-border executives relies on this calculation to prevent double taxation or complete tax omission. Non-working days, holidays and weekends are excluded from both numerator and denominator calculations to maintain accurate sourcing ratios.
Numerator Calculation
Actual days worked within border limits require precise physical presence verification through travel logs or calendar entries. Partial business days spent conducting official commercial duties within the jurisdiction usually count as full working days. Days spent solely in transit or attending personal travel are excluded from local day counts under most bilateral conventions.
Vesting Window
Equity award grant dates establish the start of the sourcing period, which ends on the contractual vesting date. Post-vesting price appreciation falls under capital gains tax rules rather than workday sourcing allocations. Vesting period adjustments occur when performance conditions alter expected share delivery timing.
Double Tax Relief
Foreign tax credits offset regional tax burdens when multiple jurisdictions tax the same equity income. Double taxation treaties reference workday ratios to divide primary taxing rights between source states and residency states. Statutory documentation of workday fractions protects international employers against redundant tax assessments.
