We don't pay any fees and taxes on OW to INT destination. All taxes and fees are assessed on return. Any time I list OW for example: JFK/LHR there is no cost. If I list the return LHR/JFK @ ABC price. If I list return for example: AGP/JFK it's XYZ price (and oodles le$$ than LHR) We don't pay extra for upgrades (as usual space avail by priority).
Sounds like the new policy will be great for your employees. Enjoy.