Oman plans to levy personal income tax as part of a broader push to move the sultanate’s economy away from reliance on hydrocarbons, Associated Press reported.

The tax would be a first among the six-member oil-rich Gulf Cooperation Council. The 5% tax will start in 2028 and will only be required of those who make upward of $109,000 annually — the top 1% of earners in Oman.

The plan was issued Sunday by royal decree and reported by the official Oman News Agency.

It’s unclear whether this will inspire other nations in the area to follow suit, though the International Monetary Fund has predicted that Gulf states may need to impose new taxes in the coming years to diversify government revenues.

The lack of income tax so far has been a boon for development in the Gulf, helping to attract migrant workers to the region, according to Associated Press.