Industry Super Australia analysis of the latest tax data found:

The average underpayment per worker was $1347 in Braddon and $1321 in Bass, totalling $14 million in Braddon and $15.3 million in Bass.

It meant 26 per cent of workers in Braddon and 28 per cent in Bass were missing out.

Industry Super said people in Bass being "dudded on super" were at risk of retiring with up to $60,000 less.

It was a similar story around the nation.

Industry Super's Super Scandalous report said unpaid super affected more than a quarter of employees nationally, costing them an average of $1700 per year.

It said Australian workers missed out on $5 billion in employer super contributions in 2018-19 alone.

Young workers, workers on low wages and those working in construction, transport, the trades, hospitality and accommodation were the most likely to be underpaid.

It said that left them with less money to retire on and a greater reliance on the age pension, paid for by taxpayers.

"One in four North Tasmanian workers suffered a $15 million ripoff, yet many of them remain unaware, assuming super is being paid when it appears on their payslip," Industry Super chief executive Bernie Dean said.

"Super is your money.

"You should get it paid at the same time you get your wages.

"By not mandating the payment of super with wages, politicians are stopping millions getting what they are owed.

"Labor's commitment to beef up ATO compliance and make it easier for workers to recover unpaid super is a step in the right direction, but it won't amount to much until they go the next step to require employers to pay super with workers' wages, just like all federal politicians get."

Industry Super said most workers did not know super payments could be made just four times a year and not with their wages, regardless of what payslips said.

"Paying super with wages would level the playing field for all employers by stopping those seeking an unfair commercial advantage by not paying their workers' full entitlements," it said.