The official said US President Barack Obama had not made a final decision on the issue, which has vexed US officials as they balance a desire to be seen promoting democracy and rights with a desire to keep up some cooperation with Egypt's military.
The military on July 3 overthrew President Mohamed Morsi, who emerged from Egypt's Muslim Brotherhood movement to become the country's first freely elected president last year after the Feb. 2011 fall of longtime authoritarian ruler Hosni Mubarak.
Morsi supporters and security forces have repeatedly clashed since, including on Sunday, one of the bloodiest days since the military took power, with state media reporting 57 people dead.
After Morsi's ouster, the Obama administration said it would suspend about $585 million in military assistance to Egypt pending a wider policy review.
The US official, who spoke on condition of anonymity, said the Obama administration was now leaning toward continuing to withhold most of that, with the exceptions described above.
The official said the United States was also leaning toward continuing some economic aid to Egypt, but chiefly funds that go to nongovernmental groups rather than to the government itself.
A second US official, also speaking on condition of anonymity, said a decision on the aid was likely to be made public by the end of the week, although he noted that an announcement has been repeatedly postponed.
Egypt for decades has been among the largest recipients of US military and economic aid because of its 1979 peace treaty with US ally Israel, which agreed to withdraw from the Sinai Peninsula it seized from Egypt in 1967 as a result of the pact.
The United States has long provided Egypt with about $1.55 billion in annual aid, including $1.3 billion in military assistance.
The removal of Morsi has left Obama with an acute dilemma: whether to get tough with the army for toppling a democratically elected president, albeit an Islamist who had few friends in Washington, or whether to acquiesce in his overthrow.
US officials have said there has been a sharp debate within the administration for months over the issue, with one saying that the Pentagon had argued for continuing military aid, while others urged a significant reduction.
At the UN General Assembly on Sept. 24, Obama appeared to split the difference, saying the United States would maintain constructive ties with Egypt's interim government despite its anti-democratic moves - including an emergency law and restrictions on opposition parties, the media and civil society.
He also suggested that some military aid would depend on the interim government embracing a more inclusive democracy.
"Going forward, the United States will maintain a constructive relationship with the interim government that promotes core interests like the Camp David Accords and counterterrorism," he said, referring to the US-brokered agreements that led to the Egyptian-Israeli peace treaty.
"We'll continue support in areas like education that directly benefit the Egyptian people," he added. "But we have not proceeded with the delivery of certain military systems, and our support will depend upon Egypt's progress in pursuing a more democratic path."
Earlier on Tuesday, CNN quoted a US official as saying that an "accumulation of events," including the recent violence, had led to the decision on a "full suspension" of aid, a report the White House denied.
"The reports that we are halting all military assistance to Egypt are false," Caitlin Hayden, a spokeswoman for the White House National Security Council, said in a statement. "We will announce the future of our assistance relationship with Egypt in the coming days, but as the president made clear at (the UN General Assembly), that assistance relationship will continue." The Pentagon declined all comment.
Vanessa Murray, a spokeswoman for the US Defense Security Cooperation Agency, which oversees foreign military aid and sales, earlier told Reuters there had been no change in policy or status regarding Egypt.
Officials at General Dynamics Corp, which makes M1A1 tank kits for Egypt, and Boeing Co, which is building Apache helicopters for the Arab country, said late on Tuesday they had not been notified of any decision to halt military aid.
There was no immediate comment from Lockheed Martin Corp, which is building F-16 fighter jets for Egypt.
Shipments of four F-16s have already been halted temporarily, and eight more jets were due to be delivered in December.
Two former government officials familiar with foreign military sales have said the Obama administration is likely to curtail certain high-visibility weapons sales such as the 12 Lockheed Martin Corp F-16s due to be delivered to Egypt this year to send a message to the military. The planes could be fairly easily adapted for sale to other countries, they said.