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The German has now officially lost his status as reigning Formula 1 champion but the Swiss publication Bilanz said he at least maintained a personal fortune of between the equivalent of R1.1-billion and R1.7-billion.
And the report said he could double that by 2020, based on his pay increase since switching to Ferrari for 2015 and beyond.
Bilanz, meanwhile, said the fortunes enjoyed by Vettel and Raikkonen were dwarfed not only by Michael Schumacher's almost R9.8-billion but another official Swiss resident, Bernie Ecclestone, with his estimated R34-billion.
DOUBLE TROUBLE?
Interestingly, the fortune of Vettel's friend and fellow Swiss resident and new team mate Kimi Raikkonen is similarly listed at between R1.1-billion and R1.7-billion.
At the weekend, the Finn was quoted as suggesting his new partnership with Vettel would be better than the one with departed Ferrari driver Fernando Alonso.
Raikkonen was quoted by Italy's La Gazzetta dello Sport as saying: "We have the opportunity to work in the same direction. The intention is to make Ferrari more competitive, but we can also contribute to the team by making a better atmosphere and sharing the same goals."
Meanwhile, in a rare candid interview with Italy's Sky, Raikkonen said he was looking forward to fatherhood and not worried that his F1 career could end after 2015.
"I have a contract for 2015 and an option for another season," he said, "but it depends on many factors. I don't know how things will go, but I hope I have a few more years left.
"If not, I have never thought my life was only F1."