The ballot was originally planned for May 22, as required by the Afghan constitution, but will be postponed until September 18, Fazil Ahmad Manawi, a senior commissioner told reporters in Kabul.
The Independent Election Commission made the decision because of "lack of budget, security and uncertainty and logistical challenges," the official said.
The Commission had previously said it was short of around 120 million dollars to hold the ballot for the Wolosi Jirga, Afghanistan´s lower house of parliament.
President Hamid Karzai´s administration had earlier called for the ballot to be held on time, pledging to fund the process if the international community failed to provide the budget.
His office was not immediately available for comment.
The United Nations has called for reforms in the commission before funding the next ballot. The reforms are aimed at preventing fraud that was widely seen in the presidential polls in August last year won by Karzai.
Afghanistan held its first direct parliamentary election in September 2005. Under the constitution the next poll was due to be held no later than 30 days before the end of the legislative cycle, which ends on June 22.
Karzai was sworn into office for a second five-year term in November following a controversial election steeped in fraud, mostly in his favour, and marred by low voter turnout and Taliban violence.
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