Australia's biggest wine company Treasury Wine Estates will boost shareholder returns and reward staff with a one-off bonus payment to recognise their contribution.

Treasury revealed the cash splash on Thursday, when it announced that net profit after tax jumped 55 per cent in fiscal 2017 to $269.1 million and unveiled a $300 million buyback.

The special payment will be paid to eligible staff in cash in October. Treasury declined to say how much its workers would receive, exactly how many would get it, or the total cost to the business. It is the first time the wine company has made a one-off payment to workers.

Instead the company relied on a statement in its accounts which said; Having delivered strong financial results and significant shareholder value over the past three years, Treasury Wine Estates will recognise team members not eligible for the company's short term incentive program (STIP) with a one-off nominal payment, to all these employees, for their contribution to TWE's success to date. The reward will be funded by TWE's existing STIP program for fiscal 2017."