Samoa's political establishment is set for an electoral overhaul in a step to form control of a new national government.

On the back of the recent dissolution of the Samoan parliament ahead of the nation's first snap election in four decades, Prime Minister Fiame Naomi Mata'afa was unable to pass the recent budget which brought down the minority government, forcing voters to go to the polls.

Opposition leader Tuilaepa Sailele Malielegaoi defended his decision to vote against the government's proposed budget on principle, insisting there is already sufficient funding available to keep essential services running for the Samoan people.

The Human Rights Protection Party leader said despite concerns raised about how it will impact ministries, the existing budget can support government operations.

"There is money – there are other funds available," Malielegaoi said in a statement.

"When the budget falls, we can still use 25 per cent from the current budget for the (next) financial year.

"I know there is a lot of money – hundreds of millions — still left."

Mata'afa, formerly the leader of the Samoa United in Faith party, has since intended to lead a new party after the Samoan Uniting Party was registered with the Office of the Electoral Commissioner.

Caretaker Minister for Public Enterprises, Leatinuu Wayne Sooialo, confirmed the sitting Prime Minster, along with her 14 cabinet members, will remain the core candidate base for the Samoa Uniting Party following a meeting of the new party's founding members this week.

"It was unanimously agreed that all 15 would register with Samoa Uniting," Sooialo said.

The Samoa Uniting Party is expected to start rolling out its list of candidates in the coming weeks, after nearly twice as many ruling figures than cabinet members were counted at the electoral office to process the formal registration of the newly established party.

A list of other parties from an incorporated societies registry also indicate the Samoa Tula'i Party in addition to the Samoa Labour Party are registering.

There is expected to be at least five new parties running in the election.

Parliament's formal dissolution on Tuesday also allowed candidates to confirm their loyalty to a chosen party for the next election.

The Samoan constitution requires an election to be held within the next three months.

As of Tuesday, no election date has been announced.

Some MPs have reportedly told the Samoa Observer they would also need to return to their constituencies for their blessing before confirming their political path.