There's criticism aimed at RNZ's outgoing boss over the public broadcaster's financial blowout.

Its been revealed an anticipated $470,000 deficit, has reached almost $12 million. 

RNZ's blaming a mix of one-off costs and overspending, and is expected to cut 58 jobs.

Herald editor-at-large Shayne Currie says it's unfathomable Paul Thompson didn't have a firm grip on the finances.

"Paul is a very renowned operator, he's been chief executive for 13 years, he knows full well how that organisation runs."

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