We had an expensive surprise this year. A sales director was granted restricted shares while working in France, moved to our US office after a year, then to Singapore. When the award vested, part of the gain was taxable in all three countries in proportion to the time worked in each during the vesting period.
Nobody had tracked her work locations against the grant. Payroll in Singapore withheld on the full amount, France was missed altogether, and we found out 14 months later. With penalties and adviser fees it cost about EUR 85,000 for one employee. We are a semiconductor company of about 3,700 people with roughly 600 plan participants.
We have since found 43 participants who have changed country during a vesting period.