Partial results from the April 5 election to succeed President Hamid Karzai have already been released, with former foreign minister Abdullah Abdullah ahead of his main rival Ashraf Ghani after half of the ballots were counted.
Hundreds of serious fraud allegations are being probed in an attempt to ensure a cleaner election than in 2009, when Karzai retained power in a vote marred by rampant cheating.
"Committed to determining results that reflect the will of Afghan voters, the IEC is conducting thorough investigations of all irregularities," the Independent Election Commission said in a press release.
The latest partial results put Abdullah in the lead with 44.4 per cent followed by former World Bank economist Ghani on 33.2 per cent.
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If no candidate gains more than 50 per cent, a second-round election between the two leading names is tentatively scheduled for May 28.
The IEC said further partial results would be announced tomorrow.
Overall turnout is set to be nearly seven million voters from an estimated electorate of 13.5 million people -- far above the 2009 turnout.
Eight candidates ran in the election, with polling day hailed a success by Afghan officials and foreign allies as the Taliban failed to launch a major attack despite threats to disrupt the vote.