According to the latest data, the tax burden ratio of Asia's fourth-largest economy stood at 18.5 percent of the GDP in 2015 and 18 percent in 2014, far lower than the OECD's average tax-GDP ratio of 25.1 percent set in 2014.

On the campaign trail, President Moon Jae-in promised to focus more on job creation and expanding welfare for young people. In particular, he said his government will create some 800,000 public jobs during his five-year term, grant an allowance to young jobseekers and offer public residence to newlyweds at lower rent.

He hinted at a hike in corporate and income taxes, and a removal of tax exemptions and benefits to secure funds over the next five years.

As a first step, his government drew up an 11.2 trillion-won extra budget Monday to create jobs and give subsidies to young jobseekers.

For corporate taxes, the finance minister nominee said he will not increase the rate immediately.

"I will try to reduce corporate tax-cut benefits and raise effective tax rates in the first place," he said. "A careful approach is needed in terms of increasing corporate taxes."

Currently, South Korea imposes a 22 percent corporate tax on companies that post taxable earnings of over 20 billion won, with 20 percent for firms with 200 million won-20 billion won in earnings.

Also Monday, Kim said in the report that he will push forward with the implementation of the law that imposes income taxes on clergy members starting next year as scheduled.

"The government will take due procedures, including holding public hearings, before the law goes into effect," he said.

The long-controversial bill is set to take effect in January 2018 as part of the government-led efforts to establish equal taxation. Religious figures have been exempted from paying income taxes for decades, given that their work is regarded as a spiritual service, not labor.

But the dispute has emerged again as Kim Jin-pyo, the head of a presidential advisory panel, suggested putting off its implementation for two years. (Yonhap)