Why does Australia tax you for moving house?

The tax is on the transaction

Transfer duty is triggered by a dutiable transaction. In a normal residential purchase, that means the legal transfer of the property from one owner to another. The house does not need to become more productive, the land does not need to increase in size and the government does not need to provide a new service specifically because the sale occurred.

The event being taxed is the transfer itself.

That makes stamp duty different from a tax such as GST on consumption or income tax on earnings. It also makes the design unusually visible to a property buyer because the bill arrives around the same time as the deposit, settlement costs and mortgage.

The name is historical. Australian stamp duties were originally evidenced by physical stamps attached to or impressed on legal documents. The stamps disappeared, but some of the tax obligations survived.

The important feature is not the word “stamp”. It is that government revenue is tied to something changing hands.

There are good reasons a government would like this tax

The criticism of stamp duty can make it sound as if the tax exists by accident. It does not. From a government's perspective, property transactions have several useful characteristics.

The assets are difficult to hide, their values are large and the transfer already passes through a formal legal and registration process. That gives the state an obvious point at which to assess and collect tax. One transaction can also produce a large amount of revenue without sending every household an additional annual bill.

That last point matters politically. A person may buy a home only a handful of times in their life. Charging a large amount at those moments concentrates the tax on a smaller number of visible transactions rather than spreading a smaller recurring charge across every property owner.

There is a weakness, however. Revenue from property transactions moves with the property market. When prices and transaction volumes rise, receipts can rise sharply. When activity slows, that revenue can fall. A tax can therefore be administratively convenient without being especially predictable.

Still, once a state budget has become accustomed to a large stream of transaction-tax revenue, removing it creates another problem immediately: what replaces the money?

The economic problem is that stamp duty taxes movement

The strongest criticism is not simply that buyers dislike paying it. Nobody particularly enjoys paying tax. The problem is what the tax can make people do differently.

Suppose a household would prefer to move closer to work, downsize after children leave home or buy a larger property after having children. Without transaction costs, the decision is mostly about whether the new home is worth more to them than the old one. Stamp duty adds another hurdle that exists only if the move happens.

That changes the calculation. The household may decide the better house is not better by enough to justify another tax bill. Someone can therefore remain in a property that no longer suits them because staying put has become artificially cheaper than moving.

The Australian Government's major tax review reached the same basic conclusion. Australia's Future Tax System described property conveyance duties as highly inefficient because they discourage turnover and can stop property moving towards its most valuable use. The review argued there should ideally be no role for stamp duties in a modern Australian tax system and linked reform to broader, more efficient state tax bases such as land.

This effect can reach beyond housing preference. Moving house can also be connected to taking a different job, changing cities or reorganising a household after retirement or separation. The review specifically identified lower labour mobility, longer commuting and reluctance to downsize among the consequences of taxing property transfers.

A tax can raise money and still create a cost by changing behaviour. Stamp duty's problem is that the behaviour it discourages is the transaction itself.

“Abolish stamp duty” leaves out the difficult part

If the argument ended there, reform would be easy. Remove the inefficient tax and let people move more freely.

The problem is that state governments still need revenue. Removing transfer duty does not remove the hospitals, schools, roads, public transport and other services funded from the broader budget. Unless spending falls by the same amount, another tax has to increase or a new one has to appear.

This is where the discussion usually turns to land tax or a broader property tax. Instead of waiting for a property to be sold and charging the buyer a large amount at that moment, government can tax the underlying land on a recurring basis.

The difference sounds technical, but the incentives are completely different. A recurring land tax is payable whether the owner sells this year or stays for another decade. Moving therefore stops creating the tax event.

That is why broad taxes on land are generally considered more efficient than narrow taxes on property transactions. Land cannot move somewhere else because the tax rate changed, and taxing its value does not require somebody to buy or sell it first.

Land tax solves one problem and creates a much more visible bill

Replacing stamp duty with land tax is not the same as making homeowners better off by the amount of duty they no longer pay. It changes who pays, when they pay and how visible the tax becomes.

Under stamp duty, the burden is concentrated on people who transact. Someone who remains in the same home for 30 years can avoid another transfer-duty bill for those 30 years. Someone who moves several times can pay repeatedly.

A broad annual land tax spreads the burden across owners instead. That reduces the penalty on moving, but it also means people who were used to paying no recurring property tax of that type suddenly receive a bill every year.

The distributional argument therefore changes. A retiree may own valuable land but have relatively little cash income. A recent buyer may reasonably object that they already paid a large amount of stamp duty and are now being asked to start paying the replacement tax as well. Governments can design deferrals, credits and long transition periods to deal with those problems, but every concession also makes the reform more complicated.

The ACT provides the clearest Australian example of this trade-off. In 2012 it began a 20-year reform program designed to abolish inefficient taxes including property-transfer duty and replace the lost revenue through the rates system. The change has been deliberately gradual, which demonstrates that replacement is possible but also why it is normally measured in decades rather than months.

Reform is economically neat and politically awkward

There is another reason stamp duty survives: the replacement is usually more visible.

A large tax paid during a property purchase is painful, but it is bundled into an unusually expensive moment. Buyers are already thinking about hundreds of thousands of dollars, mortgage approvals and settlement adjustments. Some effectively fund the cost from savings that were accumulated for the purchase.

An annual property-tax bill is different. It arrives again next year. Then the year after that. Even if the reform is designed to raise the same total revenue more efficiently, a recurring bill can feel like a new tax to households that have not recently paid stamp duty.

That creates a political asymmetry. The people who benefit from removing stamp duty include future buyers and people who might move more often. The people who see the replacement tax are existing owners, including many who were not planning to sell anyway.

A government can therefore face immediate opposition from a large group in exchange for benefits that are spread across future transactions and the broader economy. The economics of reform may be sensible while the politics remain unattractive.

The existing tax survives partly because the replacement forces the trade-off into the open.

So why does stamp duty survive?

Stamp duty survives because the question is not whether it has weaknesses. Those weaknesses are well known. The harder question is whether a government can replace a large source of revenue with something more efficient without creating a group of obvious losers during the transition.

From the buyer's perspective, the system looks strange because a large bill can arise when the same house simply moves from one name to another. From the government's perspective, the transaction is easy to identify, difficult to hide and capable of producing substantial revenue at a convenient collection point.

Both can be true.

The design problem appears when the tax begins affecting the decision it taxes. A household that stays in the wrong home to avoid another five-figure bill is not an intended public service. It is a behavioural response to the tax system.

A broad land tax largely removes that transaction penalty, but it does so by making property taxation more regular and more visible. That is a better explanation for the persistence of stamp duty than assuming nobody has noticed the problem.

Stamp duty is difficult to kill because an inefficient tax with an established revenue stream can be easier to live with than an efficient replacement that sends everyone a bill.