The Bank of England is withdrawing the paper £10 note which features a portrait of Charles Darwin on the back after March 1.
After this time, businesses and the public no longer have to accept them as payment or receive them as change.
They are being replaced by the new polymer £10 which features Jane Austen on the back introduced in September.
If you still have an old paper £10 after March 1, The Bank of England has said some retailers, banks and building societies may still accept them, however it will be at their own discretion.
Alternatively The Bank of England will always exchange its old-series notes. Notes may be presented for payment either in person or sent by post to: Dept NEX, Bank of England, Threadneedle Street, London EC2R 8AH.