Two Northern Irish banks have announced that they are switching to £ 5 and £ 10 banknotes.
The new Danske Bank and the Bank of Ireland currency will be circulated in February 2019.
The four banks of Northern Ireland can print their own money, and three of them are now ready for change.
In 2017, Ulster Bank announced that it was turning from plastic to cash following the leadership of Bank of England in 2016.
The first plastic was introduced by Northern Bank in 1999 by £ 5, Northern Ireland: two million special edition notes for a thousand thousand years.
It is said that there are Northern Irish banknotes with circa 2.5 billion pounds in circulation.
But most will be replaced now.
Danske Bank's new € 10 polymer grade will carry a portrait of inventor John Dunlop, similar to the current inventor's note in its design.
Although born in Scotland, the developer of the tire spent most of his working life in Belfast.
The Bank of Ireland will produce new £ 5 and £ 10 banknotes with the polymer versions of Bushmills Distillery in County Antrim.
Both banks will introduce £ 20 notes in 2020 or 2021 polymer.
The Irish Bank said the statement was "the biggest change in the memory" for Northern Ireland.
Paper note equivalents do not say that they will not stop accepting, but they will be taken gradually from the circulation.