But promises matter too.
Sometimes voters care less about what a government ultimately does and more about whether it does what it said it would do.
That is why the latest agreement between Labor and the Greens has triggered such a fierce political reaction.
The debate is no longer just about tax reform.
It is about trust.
And trust can be far more difficult to rebuild than any budget measure.

After weeks of negotiations, the Albanese government secured support from the Greens to pass key elements of its tax reform agenda through the Senate. The agreement includes changes affecting capital gains tax arrangements, negative gearing rules and new restrictions on self-managed super funds using borrowing arrangements to purchase residential property.
For the government, the deal represents a practical solution to a political reality.
Without support in the Senate, major reforms can stall indefinitely.
Governments of all political persuasions have often been forced to negotiate with minor parties and crossbench senators to secure legislation.
Labor argues that the reforms are designed to improve housing affordability, modernise aspects of the tax system and deliver elements of its broader economic agenda.
But critics see the situation very differently.
They argue the issue is not merely the substance of the deal.
It is the perception that Labor previously ruled out entering exactly this type of arrangement.
That criticism has become a central theme of the political fallout now unfolding in Canberra. Commentators and opposition figures have pointed to earlier statements from Labor leaders rejecting suggestions of formal cooperation with the Greens on major policy initiatives.
The dispute highlights a challenge faced by governments around the world.
Election campaigns are often built around clear messages and simple commitments.
Governing, however, frequently requires compromise.
When legislation encounters resistance in upper houses or divided parliaments, negotiations become unavoidable.
The question voters often ask is where compromise ends and broken promises begin.
That question rarely has a universally accepted answer.
Supporters of the government argue that adapting to parliamentary realities is part of governing responsibly.
Opponents argue that voters deserve consistency between campaign rhetoric and governing decisions.
Both positions resonate with different sections of the electorate.
The timing of the controversy has amplified its impact.
Australians are already engaged in intense debates about housing affordability, taxation, migration, cost-of-living pressures and economic opportunity.
As a result, any major policy shift involving housing or tax settings attracts immediate attention.
The reforms themselves have become only part of the story.
The political consequences may ultimately receive even greater scrutiny.Politics
Political trust remains one of the most valuable assets any government possesses.
When voters believe leaders are delivering what they promised, governments often receive greater flexibility to pursue difficult reforms.
When doubts emerge, every subsequent decision can face increased scepticism.
That dynamic explains why accusations of policy backflips frequently become more damaging than arguments over the policies themselves.
The debate has also placed renewed focus on the growing influence of minor parties in Australian politics.
With the Senate often fragmented, governments increasingly rely on negotiations with crossbench representatives to pass legislation.
That reality means parties such as the Greens can exert significant influence even when they are not part of government.
Whether voters view that influence positively or negatively often depends on the policy being debated.
For Labor, the immediate goal was securing passage of its reforms.
For critics, the bigger issue is whether the government paid a political price in the process.
That answer may not become clear for some time.
But one lesson from Australian political history remains consistent.
Voters can forgive unpopular decisions.
They can even forgive policy mistakes.
What they often struggle to forgive is the belief that they were promised one thing and later given something else.
As the argument over the Labor-Greens agreement continues, that may prove to be the question that matters most.
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