But IoM Post Office claims it's still 'competitive'
The cost of sending a standard letter will increase by five pence next month to 67p.
Isle of Man Post Office is blaming Brexit, customs changes and increased fuel and aircraft costs for the jump in stamp prices.
It says sending a local, or UK, letter is still 'highly competitive' and claims it represents 'excellent value for money' when compared to prices elsewhere.
The change will come into effect from 25 October.