Dopamine and debt: The brain science behind why we spend

The rush you feel when clicking “buy now” or tapping to pay isn’t just excitement – it’s chemistry.

A hormone and neurotransmitter called dopamine is released, rewarding us with a little hit of happy… it’s like a gold star for achievement.

“Well done, good job,” it whispers as we walk out of the store, shopping bags swinging.

But here’s the catch: we also experience this same buzz even when spending money we don’t have.

So, when the credit card statement lands, what was once dopamine is now debt.

Here’s why understanding how our brains react to spending can save you money and help you stay focused on your financial goals.

Retail therapy in a cost-of-living crisis?

As power bills climb, rents outpace inflation, and interest rates bite – you’d expect Australians to be tightening their purse strings.

Not quite.

According to The Australian Bureau of Statistics, household spending rose about 6.3 per cent in late 2025, the fastest pace since 2023. Even more telling, much of the growth came from non-essential categories such as furniture, fashion, and leisure.

At the same time, Compare the Market research (where I am Economic Director) shows just how much money concerns are derailing Australians. Almost half say financial worries are affecting their mental health, with many feeling anxious or down about it. Another CTM survey also found three-quarters of respondents have lost sleep over financial stress.

And yet, we’re leaning further into debt.

Credit card spending hit a record $38.7 billion in December 2025, with almost half of those balances accruing interest… a sign many households are relying on credit while budgets remain stretched.

Put the two together: high stress levels and spending, and it paints a picture of a nation reaching for consumer comfort when it can’t control bigger economic conditions.

So why do we spend when we’re stressed? The brain science behind it is truly fascinating.

Money mind games

Dopamine, the reward chemical I mentioned earlier, spikes when it senses something good is coming. That could be food, a compliment, a text from a friend, or… a purchase.

But what’s most interesting to me, is when it is released. It peaks not when we get the reward, but before it even arrives.

So it’s the scroll, the price comparing, the adding to cart when the magic really happens.

Shopping ticks many neurological boxes that excite us:

Novelty: something new.
Anticipation: waiting for it to arrive.
Control: you get to choose.
Identity reinforcement: this is who I am – or who I want to be.

Click, buy, regret

Online shopping is particularly tempting … it’s basically dopamine on demand.

There’s no closing time, and no pause between wanting and having. Algorithms also feed you suggestions based on what you’ve searched and then there are things like sale countdown clocks (“only two left in stock”) to keep you hooked.

The layered reward system is also delicious, delivering multiple happy hormones (dopamine, endorphins and serotonin) as you pass through the stages – searching – add to cart, buy now – and … delivery!

When might it be a problem?

Online shopping feels good, but it can become a problem if:

You feel guilty very soon after the rush.
Parcels arriving lift your mood more than what’s inside them.
You hide purchases or downplay spending.
You often rely on credit to fund “treats”.
You shop when stressed or upset as an emotional coping tool.

Why the high fades so quickly

Have you noticed after your parcel arrives, that you can soon forget about it?

Psychologists call this ‘hedonic adaptation’ where we quickly get used to new things. The shoes become just shoes. The gadget becomes household clutter. The new rug becomes old.

Then guess what happens?

We seek another small hit.

Add to cart.

Ways to beat dopamine at its own game

Now that we understand how our brain chemistry works when it comes to spending, particularly online, we can take back control.

The goal isn’t to stop purchasing altogether. It’s to add space between impulse and action, so your logical brain can ask: “Do I really need this?” “Will I regret it?”

I suggest the following:

The 24-hour rule: Leave the item in your cart for a day. Dopamine thrives on urgency. Time weakens it. If you still want it tomorrow and it fits your budget, then that’s a more considered decision.
Track your purchases: Not to shame yourself, but to spot patterns. Do you shop after stressful workdays? After arguments? Late at night? Awareness reduces autopilot behaviour.
Remove saved credit card details: Remove snap buying functionality. Force yourself to manually enter your card – it will give you some much-needed time to think.
Find alternative sources of dopamine: Exercise, social connection, or even tidying your space can all trigger reward pathways without the financial fallout.