0930 GMT February 17, 2020
Nazarbayev, who had run the oil-rich former Soviet republic for almost three decades before stepping down in March, and retains sweeping powers, chose the 66-year-old diplomat as his successor, making the outcome of the vote all but certain, Presstv Reported.
The smooth transition is positive news for its neighbors Russia and China as well as for foreign energy and mining companies who have invested hundreds of billions of dollars in Kazakhstan.
For many of the country's 12 million registered voters, Tokayev, a former prime minister and foreign minister, will be the only familiar face among seven candidates when they go to the polling stations after a brief and uneventful campaign.
Natalya, a pensioner, said after casting her ballot she has voted for the incumbent. "Well, Nazarbayev is no longer on the ballot and I do not know any of the other candidates," she said.
Nazarbayev, who holds the official title of Yelbasy, or national leader, and continues to run the ruling Nur Otan party, has routinely won over 90 percent of the vote in elections.
Tokayev himself has said he has no doubt that he will win the election, and promised to take guidance from Nazarbayev on strategic matters. Insiders say the men effectively share the presidential palace, although Nazarbayev's new office is in a different building.
The arrangement under which the 78-year-old Nazarbayev effectively remains in charge ensures policy continuity - but also means that political uncertainty will linger until Nazarbayev withdraws from politics.
Tokayev has appointed some new deputy ministers but stopped short of making any major personnel or policy changes as interim leader.
On the foreign policy side Tokayev, who studied at an elite Soviet diplomatic school in Moscow and focused on China, is likely to continue Nazarbayev's policy of balancing between Russia, China and the West, which has helped Kazakhstan attract foreign investment and open up markets for its oil and metals exports.
After voting at the lavish state opera house in the capital Nur-Sultan, Tokayev spoke in English with reporters, and acknowledged that Nazarbayev "was still in power in the capacity of chairman of the security council... and other capacities".
Nazarbayev's foreign-based political nemesis, fugitive banker Mukhtar Ablyazov, called for protests in cities across the country on Sunday and Monday.