In a move described as a ''policy dump'' by their opponents, the Liberals announced no fewer than 20 election commitments yesterday as part of a five-point plan for ''better local services and lower rates and charges.''

Opposition Leader Zed Seselja said the promises, which include halving stamp duty for first homeowners on properties up to $500,000 and $340 million for a sub-acute hospital in north Canberra, represented the ''most comprehensive solution ever presented by an Opposition in Canberra''.

But Chief Minister Katy Gallagher and the ACT Greens described the plan as a ''fairytale'' and warned it could not be paid for without cuts to jobs or services.

Mr Seselja defended the package yesterday afternoon and said ''absolutely not, there will be no public service job cuts'' to fund it.

He said the Opposition's policies would cost $170 million in new recurrent funding over the forward estimates and $360 million in new capital funding, while the remainder of the costs would be funded through savings and the existing budget.

In an address to media and to Liberal Party supporters yesterday, Mr Seselja said the party had decided to ''do something different to most oppositions'' and make key announcements in the areas of health, education, roads and transport, services and cost of living, early in the campaign.

''The reason we have gone out with this in the way we have is because we want to give Canberrans a clear choice,'' he said.

''They will have a clear choice between the Labor Party and the Greens who want to triple rates and who have failed us when it comes to service delivery.

''The Liberal Party has a plan for local services without tripling rates.

''We want to put that choice out there front and centre.''

Among the raft of measures, Mr Seselja promised cuts to unit tax by reducing the Lease Variation Charge to 2011-12 levels, at a cost of $12.6 million over four years.

The Liberals would abolish Treasurer Andrew Barr's tax reforms, halving stamp duty for first home owners, reinstating the first home buyers concession scheme to include established homes and protecting home owners from a ''tripling in rates''.

Mr Seselja pledged $340 million to build the proposed sub-acute hospital on land at the University of Canberra.

He also promised an extra $125 million for Canberra's roads, $204 million for capital upgrades at government schools and said a Liberal government would supply the city with ''thousands'' of new parking spaces.

The Opposition Leader said the spending spree and tax cuts would be paid for by ''identifying savings'', including changes to the Treasurer's Advance.

''We're not adopting all of the government's policies in terms of the number of policies, and the tens of millions of dollars that the government has promised,'' he said.

''There is unallocated capital within the budget that we have used to fund much of the capital promises.''

But Ms Gallagher said the Canberra Liberals' plan was ''unbelievable''.

''You can't earn less and spend more without some secret plan to cut services or jobs,'' she said.

''The package today really should be a red flag to 20,000 ACT government employees who will have to bear the brunt of paying for this plan as it was laid out today.'' Mr Barr said the Liberals' tax plan was ''fundamentally regressive in that they ask poor people to pay more and give a big tax cut to rich people.''

The Treasurer said the Opposition's claim that Labor's tax reforms would lead to a tripling in rates was from ''the same place at the bottom of the garden that they've come up with this overall package.'' Greens Leader Meredith Hunter said Canberrans should look at the commitments ''very, very closely''.

''I'd question how you can lower rates and charges and provide enhanced and more services,'' she said.

''It sounds like magic pudding, fantasy or a fairytale approach to budgeting.''