Ainsworth Game Technology, one of the world's biggest suppliers of gaming machines and software for casinos and clubs, received its $US2.7 million ($A3.9 million) repayment on June 30.
The group's US business had paid the tariffs imposed under the Trump administration's international emergency powers act.
The refund, which it revealed on Friday, represented "substantially all" of the tariffs it paid, Ainsworth said.
The return prompted it to reconsider some of its forecasts.
Underlying pre-tax profit is now forecast at between $5 million and $17 million in the first half of calendar 2026, compared to $1 million previously.
Its total revenue expectation remains at $116 million, down about 24 per cent.
However, it expects to pay down some of its debt, with net debt falling to around $8 million, down from $11.8 million at the end of December.
"The reduction in net debt was attributable to the tariff refunds ... and stronger cash collection than anticipated," Ainsworth told the stock exchange.
The refund for Ainsworth follows the US president's shock announcement in April 2025 that he would use the act to apply tariffs of between 10 per cent and 50 per cent on goods being imported into America from other countries, including Australia.
The plan sparked multiple rounds of court action in the states.
In May 2025, the US Court of International Trade blocked the imposts, saying Mr Trump had overstepped his authority.
Then, in August, the US Court of Appeals upheld that decision, and the Trump administration appealed to the US Supreme Court.
Legal challenges began in November before the Supreme Court finally struck down the tariffs as unconstitutional.
While the US government changed course and introduced a new global tariff, it still faces paying out more than $US160 billion ($A231 billion) in refunds, plus interest.
The legal case against the tariffs was started by a group of US small businesses.
Ainsworth will reveal its first-half results around August 25.
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