Watterson says the challenge ahead is "to do better with less money".
Juan Watterson has declared his intension to stand for Rushen in the General Election.
In 2016, the former accountant became the youngest politician to be elected as Speaker of the House of Keys.
Mr Watterson said the next five years will be "dominated by financial pressures, and the fall-out from the pandemic".
He added: "We will need to instill confidence that the government can still provide a great place to live and work despite this turbulence.
"I believe over my fifteen years of service I have a strong record of doing better with less money".
Douglas rates see below-inflation rise
Should people without driveways install EV chargers?
House of Keys Speaker meets Indian PM
Last chance for music festival entries tomorrow
Manx Care looking for new board member
Need for dementia treatment to be raised in Keys
£99k cocaine plotter to appeal sentence
Salon premises on the market