There may just be a payback to the state of Minnesota for any new Vikings stadium.

As much as stadium critics take whacks at the economics of stadiums — much of it deserved — we got our hands on an interesting chart (PDF). Have a look at it.
In recent days, Metropolitan Sports Facilities Commission Chairman Ted Mondale, Gov. Mark Dayton’s stadium point man, has been telling audiences that a new Vikings stadium would generate about $1.8 billion in state taxes over the potential life of a stadium for any $300 million upfront investment.
We scratched our head about this.
But the commission’s longtime sports business consulting agency — CSL International — has run the numbers and shared them with us.
Here are the debt assumptions:
• State puts in $300 million, via bonding.
• Interest rate over time is 5 percent.
• So, total debt service over a 20-year payoff is $481 million. That is, just like your mortgage at home, the cost of borrowing that initial $300 million becomes almost $500 million.
That’s the cost side.
Here are the revenue assumptions:
• Vikings players, visiting players and Vikings staff pay state income taxes of $12.5 million annually. As player income increases at 5 percent a year and staff at 3 percent a year, the revenue take increases.
• Sales tax collections WITHIN the new stadium, including liquor, are pegged at $5.3 million per year, with a 3 percent increase annually.
According to the CSL calculations, those taxes grow to about $1 billion over 30 years — the expected life of a stadium. That would be a net surplus of about $500 million to the state over the typical life of a modern stadium. The Metrodome has lasted 30 years.
If you extend it to 40 years — an unlikely length of a stadium’s life — you get to the larger number that Mondale has been mentioning, $1.8 billion in total state tax collection, or $1.36 billion as a net surplus to the state because of the initial $300 million investment.
Take a look at the chart, and see what you think.
Then, take your whacks.
MinnPost Asks Live Interview Series
Is there a future for the Vikings in Minnesota?
Join us on Monday, May 16, as MinnPost journalist Jay Weiner interviews Sports Facilities Commission chair Ted Mondale to discuss issues surrounding a new Vikings stadium. Click here for details and ticket information.