User blog comment:H-Man Havoc/Is it possible to accumulate 1,000,000+ credits in ME2?/@comment-737801-20110315235141

I personally think it would be extremely hard to stay over 1,000,000, let alone get there. By the Upgrade Guide we do know there is 1,279,751 credits in the game, without taking the optional listed there. With the optional, it is an additional 47,800, for a grand total of 1,327,551 possible. That doesn't include the eventual Medi-Gel or Power Cell pickup. I suppose if you don't mine, don't buy any upgrades, or basically purchase anything, then it could be possible, but your game would probably be harder as a result. There just isn't hat much room for over 1,000,000 credits in there.

Also the max credits I've had at one time has been just a little over 300,000. And no it didn't stay there for very long.