Update

[burntoutdex]

I was actually told by a lot of people that max gold is 1 billion but technically it can go up to 2 1 billion in stash 1 billion on person I know the achievement says 999 million but I am going by with several veteran players have said to me

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gold cap has colloquially referred to the max amount of gold a character can store on themselves. As such, the previous gold cap of 9m could be worked around by extra characters and a stash; done by many merch' and famers. This has always been a feature and how pre 999m cap, people sold ESB for 80m :]. In such aspects, the gold cap is technically infinite, only restricted by the hassle of moving billions of gold around various alts; this has always been the case

(1000 million (eg 999m) is equal to a billion)