A view of Port Sultan Qaboos in Muscat. With a country still in mourning for its former ruler and an ailing economy, National Day celebrations will be muted this year. Getty Images 
A view of Port Sultan Qaboos in Muscat. With a country still in mourning for its former ruler and an ailing economy, National Day celebrations will be muted this year. Getty Images 

Oman said to be planning income tax on high earners from 2022