Perth commuters will be able to use credit cards, phones and smart watches to pay for public transport fares from next month.

The initiative, more than a year behind schedule and more than $10 million over budget, is set to roll out from December 8.

WA Transport Minister Rita Saffioti said a four-week trial on ferries, buses and trains earlier this year had gone well.

Tap payment system on WA public transport due by year's end

A long-awaited overhaul to WA's public transport system, allowing users to pay with their phones and bank cards, is slated to rollout across the entire network by the end of the year.

"This is something that I think the public are very keen on," she said on Thursday.

"This will give people more flexibility and more choice, in particular for tourists … who might

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