All the Reserve was saying was that diverting a lump of the tax cut from high-income earners to middle and low earners wouldn’t make much difference to the degree of stimulus. Why wasn’t it worried about a $20 billion inflationary stimulus? Because it had known it was coming for years, and had already taken account of it, increasing interest rates sufficiently to counter its future inflationary effect.

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Get it? Had there been no huge tax cut in the offing, interest rates would now be lower than they are, and causing less cost-of-living pain.

As the Grattan Institute’s Brendan Coates and Kate Griffiths have reminded us, the big loser from the stage 3 tax cuts – whether the original or the revised version – is the budget.

The budget has done surprisingly well from the return to full employment, the effect of continuing high commodity prices on miners’ payments of company tax and from wage inflation’s effect on bracket creep. So much so that it returned to a healthy surplus last financial year. It may well stay in surplus this financial year.

Great. But next year it’s likely to return to deficit and stay there for the foreseeable future. Why? Because we can’t afford to give ourselves a $20 billion annual tax cut at this time. As if we didn’t have enough debt already, we’ll be borrowing to pay for our tax cut.

In theory, of course, we could pay for it with a $20 billion-a-year cut in government spending. But, as the Coalition was supposed to have learnt in 2014 – when voters reacted badly to its plans for big spending cuts, and it had to drop them post-haste – this is a pipe dream.

No, in truth, what voters are demanding is more spending, not less. The previous government went for years using fair means or foul – robo-debt, finding excuses to suspend people’s dole payments, neglecting aged care, allowing waiting lists to build up – to hold back government spending as part of its delusional claim to be able to reduce taxes.

As Dr Mike Keating, a former top econocrat, has said, we keep forgetting that the purpose of taxation is to pay for the services that our society demands, and which are best financed collectively.

So when we award ourselves a tax cut we can’t afford, the first thing we do is condemn ourselves to continuing unsatisfactory existing services, and few of the additional services we need.

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Those additional services include education – from early education to university – healthcare, childcare, aged care, disability care and defence. (Another thing the Libs didn’t foresee in 2018: our desperate need to acquire nuclear subs.)

But don’t hold your breath waiting for any politician from either major party to explain that home truth to the punters. No, much better to keep playing the crazy game where the Libs unceasingly claim to be the party of “lower, simpler and fairer taxes” and Labor says “I’ll see you and raise you”.

Anyone who knows the first thing about tax reform knows that achieving that trifecta is impossible. But if the Liberal lightweights realise how stupid repeating that nonsense makes them seem to the economically literate, they don’t care.

All they know is that the punters lap up that kind of self-delusion. Which, of course, is why Labor never calls them out on their nonsense.

The other thing we do by pressing on with tax cuts we can’t afford is sign up for more deficits and debt. Coates and Griffiths remind us that the high commodity prices the budget is benefitting from surely can’t last forever.

If you exclude this temporary benefit, Grattan estimates that we’re running a “structural” budget deficit of close to 2 per cent of gross domestic product, or about $50 billion a year in today’s dollars.

We’re ignoring it now, but one day we’ll have to at least start covering the extra interest we’ll be paying. How? By increasing taxes. How else? Ideally, we’d introduce new taxes that improved our economic efficiency or the system’s fairness. Far more likely, we’ll just be given back less bracket creep.

It’s the pollies’ bipartite policy of not stopping bracket creep by indexing the income tax scales each year that makes their unceasing talk of lower tax so dishonest and hypocritical. They’ve demonised all new taxes or overt increases in existing taxes, while keeping bracket creep hidden in their back pocket.

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Which is not to argue we must eradicate it. Most of the tax reform we’ve had – notably, the introduction of the goods and services tax – has come with the political sweetener of a big, bracket-creep-funded cut in income tax. (Would-be reformers, please note.)

Another name for bracket creep is “automatic stabiliser”. When spending is growing strongly and inflation pressure is building, bracket creep is one of the budget’s main instruments working automatically to help restrain demand by causing people’s after-tax income to rise by a lower percentage than their pre-tax income.

The pollies can’t just let bracket creep roll on for forever. You have to use the occasional tax cut to return some of the proceeds. But July 2024 turned out to be quite the wrong time to do it.

So even if the Reserve starts to cut interest rates towards the end of this year, the tax cuts mean rates will stay higher for longer than they needed to.

Ross Gittins is the economics editor.

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