Sounds like you're not talking about higher duties, per se, but an allowance for the remote nature of the work while overseas. If the staff concerned are clearly performing the tasks and responsibilties of a higher paid person, the question of higher duties allowance is easy to calculate, but in your case it seems more a matter of coming up with a fair and reasonable allowance to reflect the nature of the remote overseas work. Presumably for a short term overseas job you are already paying for all accommodation, meals and other expenses, so unless it's a really crappy location with security or health risks and/or unpleasant working conditions, I'm not so sure I'd be paying anything extra at all though.
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