Gold miner issued with tax bill for historical corporate income tax for period between 2000 and 2017.
The government said the miner owes $40 billion in unpaid taxes and $150 billion in penalties and interest.
The assessments were issued over the alleged under-declared export revenues.
Tanzania has slapped Acacia Mining with a $190 billion tax bill, potentially escalating the dispute over royalties the government says it is owed.
The firm said it received a notice on the tax bill Monday from the Tanzania Revenue Authority (TRA) for historical corporate income tax, covering the last 17 years.
TRA claims Acacia, the biggest gold miner in the country, owes the government $154 billion from its Bulyanhulu mine and $36 billion from Buzwagi.
The government said the miner owes $40 billion in unpaid taxes and $150 billion in penalties and interest.
The London-listed company however disputes the assessments.
“The assessments are issued in respect of alleged under-declared export revenues, and appear to follow on from the findings of the First Presidential Committee announced on 24 May 2017 and the Second Presidential Committee announced on 12 June 2017. As we have stated previously, Acacia refutes each set of findings and re-iterates that it has fully declared all revenues,” it said.
Acacia has referred the disputes for international arbitration.