The delay was caused by the blockade of the war-torn Donbass region by Ukrainian activists as well as the government's decision to suspend transport connections until a full ceasefire in east Ukraine, according to the Ukrainian Finance Ministry.
Earlier, Poroshenko stated he hoped to receive $1 billion in IMF loans before the end of the month.
"Today, the IMF at the meeting of its leadership should have provided us with another tranche of $1 billion which is critically necessary to replenish the gold and currency reserves, to retain the stability of the national monetary unit, for a very powerful signal to investors," Poroshenko said, as broadcast by the 112 Ukraina television channel.
"I emphasize that we need to unite together in order to receive the tranche soon," Poroshenko said, addressing the council for regional development.
In 2015, the fund approved a four-year program of financial aid to Ukraine, which stipulates a $17.5-billion loan to be paid out in installments over the program period and originally open for review on a quarterly basis. The bailout package requires Kiev to implement reforms.
Ukraine is heavily relying on foreign aid to support its economy and to pay debts amid the ongoing armed conflict with militia in the country's southeast.
