Not All of the Rise in Trade Wages Is Real. That's the Part We Can Actually Fix.

By Aiden Garrison

Everyone already knows labour costs are driving up construction prices. The part worth arguing about is how much of that wage increase reflects genuine value, and how much is just the price of scarcity, because that distinction points to a fix that doesn't require cutting anyone's take-home pay.

It's not news that a shortage of qualified tradespeople is pushing up construction costs. What's less discussed is that not all of that wage increase reflects the value of the work being done. Part of it is a scarcity premium, a price paid purely because there aren't enough workers to go around, and that distinction matters because it points to a policy lever most of the current debate ignores: shrink the scarcity, not the wage, and use the tax system to make sure workers don't lose out either way.

The wage is a market price. But it isn't a clean one.

A wage is, technically, a market price. It reflects supply, demand, and the value both sides place on the transaction. Nobody is arguing otherwise. The argument here is narrower: in a severely constrained labour market, that price contains a scarcity premium, and that premium can push construction costs well above what a longer-run, better-supplied equilibrium would imply.

Consider a simple scenario. Employer A offers a tradesperson a dollar an hour. Employer B, short of workers and desperate to keep a job moving, offers $1.30. The worker moves. Employer A now has to match it or lose their own workforce to the next bidder. Labour costs across the sector ratchet up, not because productivity rose or the work got harder, but because there are more jobs than people to do them.

That's the mechanism worth separating out: part of the wage is genuine compensation for skill and effort, and part of it is a premium that exists purely because supply can't keep pace with demand. The two get bundled together in the headline wage figure, but they behave very differently: the second component is exactly the part a well-targeted supply-side policy can address without touching the first.

What a shortage actually does to housing supply

It's tempting to assume employers simply pass wage increases straight through to the customer. In practice the effect is messier, and arguably a bigger problem for housing supply than a straight price pass-through would be.

The more realistic chain runs: labour shortage → wage pressure → higher construction costs → some combination of higher prices, thinner margins, delayed projects, and developments that no longer stack up financially → less housing actually gets built. Builders don't have unlimited pricing power. They're constrained by what buyers can pay and by competition from other builders, so a meaningful share of the cost increase shows up as projects being shelved or slowed rather than fully passed on. Either way, the outcome is the same: fewer homes delivered into a market that's already short of them.

That's the real cost of the scarcity premium. It isn't just "prices go up." It's "supply gets choked at exactly the point Australia needs it flowing."

An illustration, not a measurement

To see how much a modest change in labour supply can shift this dynamic, it helps to work through a hypothetical. Imagine, for illustration, that the residential construction industry has only 50% of the labour capacity it actually requires: five qualified workers available for every ten jobs needing to be filled. That's a deep enough shortfall that employers are bidding aggressively against each other just to keep projects staffed, because losing a worker can mean a project stalls entirely.

Now imagine that shortfall narrows to 85%, or 8.5 workers for every ten jobs. There's still a shortage. Workers remain, on balance, in the stronger negotiating position. What changes is the intensity of the bidding war. Employers have more workers to draw from and don't need to outbid each other by as wide a margin just to keep a job moving. Wages likely keep rising, since there's still genuine scarcity, but the rate of increase should decelerate toward something closer to ordinary, productivity-driven wage growth rather than a scarcity auction.

To be clear: 50% and 85% are illustrative figures chosen to make the mechanism easy to follow. They are not measured figures from the Australian construction labour market, and any real policy proposal would need to be built on actual vacancy and workforce data for the specific trades involved, not on these placeholder numbers.

A targeted, time-limited supply response, not open-ended migration

The lever that closes a labour supply gap fastest is migration, because domestic apprenticeship pipelines take several years to produce a qualified tradesperson, while a targeted visa pathway can bring in already-qualified workers in a fraction of that time. This is not an argument for loosening migration settings broadly. It's a case for a narrow, specific intervention:

- Occupation-specific intake: carpenters, electricians, plumbers, and other trades with verified, documented shortages, not a general increase to net overseas migration.

- Verified shortages, assessed against real vacancy and workforce data, not assumed ones.

- Regional targeting where the shortage is most acute, rather than a blanket national settings change.

- Faster entry pathways and streamlined skills recognition specifically for qualified trades already holding recognised qualifications.

- A bridge, not a permanent substitute: migration fills the gap while domestic training capacity (apprenticeships, TAFE places, employer-sponsored training) is scaled up to meet the same shortfall over the medium term.

The point isn't "more migrants." It's "the fastest available way to close a specific, documented labour supply gap while the slower domestic fix catches up."

The tax lever: protecting income, not suppressing wages

This is where the proposal's two claims need to be separated clearly, because they are doing different jobs and stand or fall on different grounds.

The economic claim: increase skilled-trade labour supply → reduce the scarcity premium → lower construction costs → increase housing supply. This is the argument made in the sections above.

The distributional claim: if gross wages subsequently grow more slowly as a result, use tax policy to protect workers' net incomes, so the benefit of the supply-side fix doesn't come at the worker's expense.

The distributional claim rests on a distinction that's easy to state and easy to lose track of in most wage debates:

- Gross labour cost to the employer: what a business pays per hour of trade labour, inclusive of the scarcity premium described above.

- Net disposable income to the worker: what the worker actually keeps after tax, which is what determines their living standards.

Those are two different things, and the distinction matters. A supply-side fix that softens gross wage growth doesn't have to reduce what a worker actually lives on, provided the tax side is adjusted to compensate. That's the entire logic of the proposal in one sentence: address the cost side through labour supply, and address the income side through the tax system, rather than expecting one lever to solve both problems.

Purely as an illustration, and not a costed estimate, imagine a well-targeted increase in labour supply softens the growth rate of gross wages by something in the order of 15% relative to where they'd otherwise land. A tax-free threshold increase could, in principle, be calibrated to offset that gap in take-home pay. But calibrated is the key word: a higher threshold does not automatically preserve take-home pay after a given gross wage reduction. The size of the increase needed would have to be calculated against the actual wage distribution of the affected trades and their relevant marginal tax rates, since a flat threshold change will over-compensate some workers and under-compensate others depending on where they sit in that distribution. This is a design detail that would need real modelling before implementation, not a mechanism that works automatically at any threshold level.

This decouples two things that usually get conflated in wage debates, what the worker receives and what the employer pays, and lets each be addressed with the tool best suited to it: labour supply for the cost side, tax policy for the income side.

Why this could look more expensive to Treasury than it turns out to be

Treasury, like the UK's OBR or the US's CBO, tends to apply conservative assumptions when costing measures like this. That's not a flaw unique to this proposal. It reflects the fact that the second- and third-round effects of a policy like targeted migration plus a tax offset depend on genuinely uncertain assumptions: how labour supply actually responds, how much investment and construction activity gets unlocked, how many additional projects become financially viable, what the relevant tax elasticities are, and how large the flow-on economic multipliers turn out to be.

Because those effects are uncertain, they may not receive full fiscal credit in a budget costing. The practical consequence is that a policy like this could look more expensive on a static, first-round basis than its eventual real-world fiscal impact, not because a costing would be dishonest, but because the conventional approach is structurally cautious about crediting effects that can't be confidently quantified in advance.

The dynamic case for revenue, stated carefully

There is a case that some or all of the static revenue cost gets clawed back through a larger economic base, but it depends on a chain of effects holding together, not on a single leap from "cheaper labour" to "more tax."

The chain runs: lower construction costs → more projects become financially viable → more construction activity actually happens → more employment in the sector → more downstream activity in materials and logistics → additional GST, PAYG and company tax collected across that activity a larger overall economic base to tax.

Each link in that chain is plausible. None of them is guaranteed, and the size of the eventual effect is genuinely uncertain: it depends on how responsive the construction sector is to lower labour costs, how much latent demand for housing gets unlocked, and how much of the resulting activity is genuinely additional rather than activity that would have happened anyway. The honest position is that this dynamic effect is a real possibility worth factoring into how the policy is judged, not a guarantee that the policy pays for itself.

What the policy actually is

The objective isn't to suppress trade wages. It is to increase labour supply enough to reduce the extreme scarcity premium currently embedded in construction costs, while protecting workers' real disposable incomes through the tax system.

Put simply, the policy is not "make trades cheaper." It's "make the trades market less severely scarce," and use the tax system, not wage suppression, to make sure workers don't carry the cost of that adjustment.

This is a supply-side housing policy, not a migration debate

This isn't a left-versus-right argument about migration levels, and it shouldn't be read as one. It's a supply-side response to a housing shortage. If Australia needs more houses, it needs more people capable of building them. The real question is how to increase that supply, through migration, training, or both, without unnecessarily reducing the living standards of the workers already in the trades.

The case, in short

- Trade wages are genuine market prices, but in a severely constrained labour market they carry a scarcity premium on top of the value of the work itself.

- That premium doesn't just raise prices. It also thins margins and stalls projects, directly reducing housing supply.

- A meaningful narrowing of the labour supply gap, illustrated, not measured, at 50% moving to 85%, can materially cool wage growth without requiring an oversupplied market.

- Targeted, occupation-specific, verified-shortage migration is the fastest available bridge while domestic training capacity scales up. It is not a case for loosening migration broadly.

- A targeted tax-free threshold increase, properly calibrated against actual wage distributions and marginal tax rates, can protect workers' real take-home pay even as the scarcity premium in gross wages comes down.

- Treasury's conservative approach to uncertain behavioural and second-round effects means a policy like this could look more expensive on a static basis than its eventual fiscal impact, depending on how much additional construction and employment it generates.

- The goal throughout is reducing structural scarcity, not suppressing wages, and doing it as a housing supply policy, not a migration argument.