Money · Credit · New Zealand
Where does money actually come from?
Most of us use money every day without ever needing to ask where it comes from. Once you do ask, the answer changes the way you think about banking, debt, infrastructure and what a country can afford to build.
We get paid. We transfer money. We borrow. We save. We pay tax.
It is easy to imagine that money simply moves around: one person saves it, a bank lends it, somebody else spends it.
That is not the full picture of a modern monetary system.
Most of the money we use is bank deposits
The Reserve Bank of New Zealand explains that there are several forms of money. It directly creates the monetary base — physical notes and coins and settlement cash held by banks at the Reserve Bank.
But that is only a small part of the money supply. The Reserve Bank says bank deposits make up about 98% of broad money in the New Zealand economy.
So where do all those bank deposits come from?
The Reserve Bank's answer is straightforward: bank deposits are created through the bank lending process.
Reserve Bank: Money creation in New Zealand ↗
What happens when a bank makes a loan?
Imagine a bank makes an $800,000 mortgage loan.
On the bank's balance sheet, the loan becomes an asset because the borrower owes the bank $800,000. At the same time, a corresponding deposit is created in the banking system as a liability of the bank.
That deposit is spendable money.
The Reserve Bank uses this kind of balance-sheet example to explain how broad money increases when banks lend. As loan principal is repaid, the corresponding broad money is reduced again.
Loan created → deposit created → money enters broad circulation.
Loan principal repaid → deposit money is extinguished.
This is not a fringe theory. It is part of the Reserve Bank's own explanation of money creation in New Zealand.
That does not mean banks can create unlimited money
They cannot.
Banks still operate within real constraints. They have to assess whether borrowers can repay. They have to manage credit risk, liquidity and funding. They must hold capital and comply with prudential requirements. Interest rates affect demand for credit, and borrowers have to be willing and able to take on debt.
The Reserve Bank also uses monetary policy to influence financial conditions and inflation.
So the serious point is not that money is unlimited.
The serious point is that money creation and credit allocation are part of the architecture of the financial system.
That changes the question
Once you understand that deposits and credit are created inside the financial system, a bigger question appears:
When New Zealand says we "cannot afford" something, what is the actual constraint?
Sometimes the answer really is financial. Debt servicing matters. Interest costs matter. Fiscal credibility matters.
But there are also physical limits.
If New Zealand decided tomorrow to build ten new hospitals, money alone would not create ten times as many doctors, nurses, engineers, electricians, builders, medical devices, tonnes of steel or cubic metres of concrete.
If financial demand grows faster than the economy can provide the labour, materials and services being demanded, inflation can follow.
That means the useful question is not:
"Can we create unlimited money?"
We cannot.
The useful question is:
"What financial capacity do we have, what real productive capacity do we have, and how should we combine them?"
Investment is not the same as day-to-day spending
This distinction matters when public money creates an asset that may serve New Zealanders for decades.
Treasury's 2025 Investment Statement distinguishes investment in Crown assets from ordinary operating expenditure. It notes that government investment can be funded from revenue or through debt, and that debt can spread the cost of long-lived assets across the generations that receive their benefits.
Treasury: He Puna Hao Pātiki — Investment Statement 2025 ↗
Treasury's 2025 Long-term Fiscal Statement also says there can be a case for borrowing to finance long-lived infrastructure — particularly where investment supports growth, avoids productivity constraints, or allows future New Zealanders who benefit from infrastructure to contribute to its cost.
Treasury: He Tirohanga Mokopuna — Long-term Fiscal Statement 2025 ↗
That does not make every project a good investment. Poor investment can leave future generations with debt and weak assets.
It means we should examine both sides of the balance sheet.
What did we borrow?
And what did we build with it?
New Zealand already has an infrastructure question
Treasury reported in its 2025 Investment Statement that Crown hospital and healthcare buildings were, on average, 45 years old against a typical life of around 50 years. It also reported that about one-third of roughly 16,000 education buildings were more than 50 years old.
Those are not abstract entries in a spreadsheet.
They are hospitals where people receive treatment and schools where children learn.
Treasury also reported Crown assets of about $571 billion and liabilities of about $380 billion.
So when we discuss public investment, perhaps the conversation should go beyond:
"How much does it cost?"
Cost matters. But so do the asset being created, the economic capacity it enables, the risks attached to the financing, and the cost of doing nothing.
Better questions
What are we building?
How long will it last?
What will it produce or enable?
Who benefits from it?
What workers, materials and energy will it require?
How should it be financed?
What inflation, debt and execution risks does it create?
What safeguards make sure financial capacity is used productively rather than recklessly?
Before we decide what New Zealand can and cannot build, we should understand how New Zealand's money and credit system actually works.
Where I want to go next
This is the first piece in a series about money, credit and New Zealand.
Next I want to look more closely at what actually happens on a bank's balance sheet when it creates a loan, why reserves are different from bank deposits, what really constrains lending, and what all of that means for the way we think about national investment.
I am not interested in slogans about "free money" or pretending financial constraints do not exist.
I am interested in understanding the system properly — because once we understand the machinery, we can ask much better questions about what we choose to build with it.
Primary sources
Reserve Bank of New Zealand — Money creation in New Zealand ↗
Reserve Bank of New Zealand — Money and credit aggregates ↗