The pair have received equal billing for the Steven Spielberg movie, which has been generating awards interest and is finally out in the UK next week.
Speaking to ITV News, Hanks said: “That’s a good question. Quite frankly I don’t know how much I got paid.”
Streep then whispered to the journalist, “I got more than him”, though she appeared to be joking.
She later added: “I actually don’t know whether we have [been paid the same].
“I would be very p****d off [if not] and I’m going to find out later.”
Hanks said: “You worked more than me, so you should.
“Let’s find out. We’ll ask.”
An interview with Liam Neeson has also been generating attention, after he called Hollywood’s gender pay gap a “f**king disgrace”.