Taxpayers will fork out $75 million to help the beleaguered operator of two new Spirit of Tasmania ferries navigate ongoing financial issues.

It has also been revealed human error is to blame for $9 million worth of upgrades needed for the vessels and their yet-to-be-completed berth in Tasmania.

The two replacement vessels aren't expected to be in service until late 2026, years behind schedule, because a berth in Devonport wasn't built in time for their arrival.

The saga, which caused one of the new ships to be kept in Scotland for months, has been dubbed one of the biggest infrastructure stuff-ups in Australia's history.

Tasmania's government on Monday announced it would give the ship's state-owned operator TT-Line an injection of $75 million in the November 2025/26 budget.

The funds

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