Auckland ratepayers will be saddled with a bill of roughly $220 million each year to run the City Rail Link - once it opens.

Chief executive Sean Sweeney says the project is 80 percent complete, but there's no guarantee the November 2025 deadline will be met.

Auckland Business Chamber CEO Simon Bridges says there's no excuse for these extended cost blowouts and delays.

"It's created a huge amount of problems. Just by the cost blowouts, the fact that this has taken too long and there doesn't seem to be a particularly good end in sight."

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