The old £10 note needs to be spent by March next year, the Bank of England has revealed.
The old currency will cease to be legal tender by 11.59pm on Thursday, March 1 after the new notes featuring Jane Austen were released earlier this year.
Old notes can still be spent before this cut-off date and exchanged at the Bank once this point has passed.
The Bank introduced the paper £10 note featuring naturalist Charles Darwin on November 7, 2000.
About 55% of the £10 notes in circulation are made from polymer, while 359 million are paper.
The new £10 banknote, which was introduced on September 14 and features a picture of Jane Austin, is the first Bank of England note with a tactile feature to help blind and partially-sighted users.