Australia's AAA credit rating has been locked in as the Reserve Bank governor plays down a surprise jump in unemployment.

Ratings agency Fitch maintained its full-marks assessment of the nation's financial position overnight on Tuesday citing Australia's strong institutions, resilient growth outlook and improving government deficits.

Treasurer Jim Chalmers and Finance Minister Katy Gallagher said the call was a "powerful endorsement" of Labor's economic management.

"We are realistic about the challenges facing our economy including growing global uncertainty, but our AAA rating is further proof Australia is coming at these challenges from a position of genuine economic strength," they said in a joint statement.

While Australia maintained its perfect credit score among all three ratings

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