CAIRO, Egypt, June 2 – Egypt’s stock market witnessed a sharp plunge that forced a temporary suspension of trading, after reports of a newly proposed government tax on capital gains, which experts said was hardly explained to investors.

The half-hour suspension, on the first day of the trading week at the Egyptian Exchange, failed to cool a frenzy of selling by investors. The EGX30 benchmark index closed 4.22 percent lower, or at 7,894.73 points, continuing its slide after trading was suspended after the broader EGX100 index fell by 5 percent.

Egyptian Finance Minister, Hany Kadry Dimian, announced the new tax on capital gains Thursday, fuelling the market slide. He said, the government will impose a 10-percent tax on net realised portfolio profits, at the end of the year. Stock market profits are currently tax-free.

Wael Ziada, the head of research at EFG Hermes, one of the Middle East’s largest investment banks, said, the proposed law wasn’t clearly explained or discussed, causing the “extreme reaction” in the market.

“A lot of brokerage firms had no response to their clients” on how the law will be imposed, when it will take effect or how to calculate the tax, he said. “This is a case of total chaos.”

Ziada said, the gains from such a tax don’t justify the “damage” that occurred in the market because it will be a challenge to collect it. The Exchange said in a statement, the law has been sent to the interim president for approval.

“In my view, until we see the law and if this is the way decisions will be taken going forward, there will be damages,” Ziada said.

A dozen Egyptian investors gathered outside the exchange to protest the law.

“We came here to protest those random decisions by the government,” said Aly Youssef, one of the investors. “Investors have lost huge amounts due to those random decisions.”

The sharp drop also followed Egypt’s presidential election last week, which saw retired army chief Abdel Fattah el-Sissi, who led the July military overthrow of Islamist President Mohammed Morsi, reportedly trounce his only competitor. Official results are expected in the coming days.

“Following Egypt’s elections, we expected a positive impact on the stock exchange. We predicted that benchmark will exceed the 9,000-point mark but the proposed draft tax … had a negative impact on the benchmark,” said Amir Youssef, a stock exchange broker.

The current interim government and el-Sissi have said, tough measures will be taken in the coming months to reduce a crippling budget deficit, internal debts and ease unemployment, officially estimated at 13 percent. That likely will include new taxes and cuts to huge state subsidies on energy and food, though details have yet to be announced.

In an apparent bid to ward off the expected crunch, interim President, Adly Mansour, issued a decree giving Egypt’s more than 5 million state employees a 10 percent raise on their basic salaries starting June 30.

Egypt’s Cabinet also has drafted a new budget, with the deficit continuing to hover at around 12 percent. The proposed budget has a 10 percent increase in public expenditures from the current financial year budget of $115 billion. The proposed draft budget shows that the wage bill is expected to increase by 13 percent to some $30 billion.

Oil-rich Gulf countries have injected about $20 billion in aid, small grants and fuel products into the Egyptian economy, following Morsi’s ouster. The new budget, with the financial year beginning in July, features only $2.4 billion in Arab aid until Aug, the government statement said.