Money · Credit · New Zealand · Part 5
Is government debt always bad?
Debt can weaken a country. Debt can also finance assets that make a country stronger. The word itself does not tell us which one is happening.
Public debate often treats government debt as though it is automatically evidence of failure.
Sometimes it is a warning sign.
But sometimes borrowing is exactly how a government spreads the cost of a long-lived asset across the generations that will use it.
The right question is not simply: how much debt do we have? It is: what did we borrow for, what did we build, and can we carry the obligation?
Debt is a liability — but look at the other side
When the Crown borrows, a liability is created.
That matters. Interest must be paid. Principal eventually has to be refinanced or repaid. Higher debt can reduce the Government's room to respond to recessions, natural disasters and other shocks.
But a balance sheet has two sides.
If borrowing finances an asset that adds lasting economic or public value, the Crown may also be creating or improving an asset at the same time.
Treasury's 2025 Investment Statement makes this distinction explicit. It says the Government invests in assets to provide services and funds part of that investment by issuing debt.
Treasury — He Puna Hao Pātiki: Investment Statement 2025 ↗
Borrowing for an asset is different from borrowing to cover a permanent operating gap
Suppose the Government borrows $1 billion.
That number alone tells us very little.
If the $1 billion is used to cover recurring operating expenses with no credible plan to bring revenue and expenses back into balance, the Crown has a growing liability without necessarily adding a lasting asset.
If the same borrowing funds resilient electricity infrastructure, a hospital, water assets or transport capacity with a long useful life, the fiscal and economic proposition is different.
That does not make the second project automatically worthwhile.
The asset could still be badly designed, overpriced, delayed or fail to produce the expected benefits.
But the analytical question is different.
Borrowing for consumption and borrowing for productive capital should not be treated as though they are economically identical.
Treasury explicitly recognises this
Treasury's Investment Statement says its recommended fiscal framework allows borrowing to finance long-term investments while maintaining headroom beneath a prudent debt ceiling.
It also notes that net investment grows the Crown's capital stock, meaning an increase in debt used for investment can be matched by an increase in assets.
That is why public debt cannot be evaluated sensibly without also looking at Crown assets, net worth and the quality of investment.
But debt used for operating deficits is different
Treasury also warns that persistent operating deficits weaken the Crown balance sheet.
Its 2025 Investment Statement projects liabilities rising faster than assets under current policy settings, with net worth declining as borrowing is used not only for investment but also to finance ongoing operating deficits.
This is an important distinction.
If today's services are persistently being funded by tomorrow's borrowing, the Government is shifting costs forward without necessarily leaving a corresponding productive asset behind.
That can reduce fiscal resilience.
How much debt does New Zealand currently have?
The most recent Treasury interim financial statements available as at 29 August 2026 reported net core Crown debt of $186.0 billion at 31 May 2026, equal to 41.3% of GDP.
Treasury — Interim Financial Statements to 31 May 2026 ↗
Budget 2026 forecasts net core Crown debt rising further before falling: from 42.4% of GDP in 2025/26 to a peak of 46.1% in 2027/28, then declining to 44.4% by 2029/30.
Treasury — Budget Economic and Fiscal Update 2026 ↗
The Government's current fiscal strategy is to put net core Crown debt on a downward path toward 40% of GDP, and once below that level, maintain it within a 20% to 40% range in normal times, subject to economic shocks.
Why does the debt ratio matter?
Debt is usually discussed relative to GDP because the size of an obligation means something different in a $50 billion economy than in a $500 billion economy.
A debt-to-GDP ratio gives a rough indication of the size of sovereign debt relative to the economy that ultimately supports the tax base.
But it is not a complete measure of fiscal strength.
Treasury also looks at net worth, financial net worth, the operating balance, debt-service costs, the maturity structure of debt and the Crown's ability to withstand shocks.
A country with valuable assets, reliable revenue and a productive economy may be able to sustain more debt than a country with the same debt ratio but weaker institutions and poor growth prospects.
Interest costs are real
Government borrowing is not free.
New Zealand Government Bonds pay interest to investors.
As the stock of debt increases, or as borrowing rates rise, debt-servicing costs can consume a larger share of government revenue.
That creates an opportunity cost.
Money spent servicing debt cannot simultaneously be spent somewhere else.
So the test for new borrowing should be demanding.
What is the expected return?
Is the return financial, economic, social or a combination?
Will the asset reduce future costs?
Will it increase productivity?
Will it improve resilience?
Could it be financed more efficiently another way?
And can the Crown afford the interest under less favourable economic conditions?
Debt also preserves or consumes future choices
One reason governments maintain debt headroom is that crises happen.
Earthquakes happen.
Pandemics happen.
Recessions happen.
Financial shocks happen.
If the Crown enters a crisis already heavily constrained, it has fewer options.
Treasury therefore treats fiscal resilience as a reason to maintain prudent debt levels rather than simply maximising borrowing whenever markets are willing to lend.
Borrowing capacity is itself a national asset. Using it badly today can remove choices tomorrow.
But refusing to invest also carries a cost
This is the other side of the argument.
Governments can preserve a low debt ratio by delaying investment.
But if that means hospitals deteriorate, transport bottlenecks deepen, water networks fail, electricity constraints emerge or schools become increasingly expensive to maintain, the country has not escaped a cost.
It has deferred one.
Deferred maintenance can turn a manageable capital programme into a much larger future liability.
Infrastructure shortages can also limit productivity and private investment.
So fiscal prudence cannot simply mean minimising debt.
It has to mean managing both liabilities and assets well.
Intergenerational fairness cuts both ways
Borrowing for an asset that will serve people for fifty years can allow future users to share part of its cost.
That can be fairer than requiring today's taxpayers to fund the entire project immediately.
But borrowing to maintain today's consumption while passing the debt forward is the opposite proposition.
Future generations receive the bill without necessarily receiving the asset.
That is why the purpose and quality of borrowing matter.
A better test for government debt
Instead of asking whether debt is good or bad, I think every major borrowing decision should have to answer a clearer set of questions:
What exactly are we financing?
What asset or capability will exist afterward?
How long will it last?
What measurable public or economic value should it create?
What is the total financing cost?
What happens if interest rates, construction costs or growth assumptions move against us?
Does the project strengthen or weaken Crown net worth?
And what opportunity are we giving up by using borrowing capacity here?
Debt should be governed as capital, not treated as either a moral failure or free money.
The political argument is usually too shallow
"Debt is bad" is too simple.
"The Government can always borrow more" is also too simple.
New Zealand needs a more disciplined distinction:
bad debt: borrowing that creates weak assets, funds persistent structural deficits or cannot reasonably be serviced.
potentially productive debt: borrowing used for well-governed assets or investments that strengthen capacity, resilience or long-term economic performance.
Whether a particular project belongs in either category has to be demonstrated, not assumed.
So is government debt always bad?
No.
But neither is it harmless.
Government debt is a financing tool.
Used badly, it can erode fiscal resilience and leave future generations carrying the cost of decisions that produced little lasting value.
Used carefully, it can help finance assets that future generations will use and benefit from.
The question is not whether a government borrowed.
The question is whether the borrowing made the country's balance sheet, productive capacity and public infrastructure stronger or weaker.
Next
That leads directly to the next question:
What does "we can't afford it" actually mean?
Because sometimes the constraint is debt.
Sometimes it is inflation.
Sometimes it is labour, land, materials or energy.
Sometimes it is a weak business case.
And sometimes it is simply a political choice about priorities.
Part 6 will separate financial constraints from real-resource constraints and ask how New Zealand should tell the difference.
Primary sources
Treasury — He Puna Hao Pātiki: Investment Statement 2025 ↗