Senator Elizabeth Warren on Wednesday invited the billionaire Bill Gates to meet so she could allay his worries about her plans to raise taxes on the wealthy and explain “exactly how much” he would pay.

Speaking with the columnist Andrew Ross Sorkin at The New York Times DealBook Conference on Wednesday, Mr. Gates, the Microsoft co-founder and philanthropist whose fortune totals over $100 billion, said that he had paid over $10 billion in taxes and that it would be “fine” if he had to pay $20 billion.

“But, you know, when you say I should pay $100 billion, O.K., then I’m starting to do a little math about what I have left over,” he added. “Sorry, I’m just kidding. So you really want the incentive system to be there and you can go a long ways without threatening that.”

[Speaking at the same conference, Hillary Clinton voiced skepticism of a wealth tax.]

Mr. Sorkin then asked Mr. Gates if he had ever spoken about this with Ms. Warren — he said he had not — and asked Mr. Gates if he would want to.