Japan's government and ruling parties are expected to begin final arrangements to wrap up the current Diet session as scheduled, on June 26.
Prime Minister Shinzo Abe is reportedly opposed to dissolving the Lower House to hold a snap election concurrently with the Upper House election this summer.
But the final decision will likely be made after considering plans by the opposition camp.
The government is preparing to host a two-day meeting of the G20 summit in Osaka from June 28.
Officials are also mindful of the need to lay the groundwork for a planned consumption tax hike at a time when US-China trade frictions are growing and the global economic outlook is becoming uncertain.
They are anxious to avoid creating a political vacuum by holding simultaneous elections of both houses.
The governing Liberal Democratic Party appears to be factoring in reluctance by its junior coalition partner, Komeito, to hold both elections at the same time. Komeito says that would confuse voters.
Opposition parties are considering the possibility of submitting a no-confidence motion against the Abe Cabinet.