New York City skyline representing shadow payroll and cross-border tax compliance for global employees If you have a client who's working across borders — a US employee on assignment in London, a UK national temporarily in a New York office, or an executive splitting time between two countries — chances are “shadow payroll” has come up in conversation. It sounds like something out of a spy movie, but it's actually one of the most common (and most misunderstood) tools in globa