It's expected the Manannan will be replaced by a new fast craft in 2030.
That's according to the Steam Packet's business plan for 2024.
It also shows that almost £2m will have been spent on refurbishing the Manannan, despite having a previous budget of £250,000.
The company also plans to spend £370,000 on work to its booking system and development of a mobile app.
Appeal launched after fly-tipper filmed dumping rubbish
Prepare your pets for Bonfire Night, says Manx charity
Manx Care bringing in mobile translation machine
Steam Packet says it would get too many Freedom of Information requests
Vintage TT trophies on sale for £5,000
TT merchandise company still owes government over £100k
Manx Care's annual assessment shows £15.6m deficit
House of Keys to sit this morning