I'm not going to pretend I've never bought rubbish. I've bought a treadmill that became a wardrobe, a "keep your to-dos and your weather in one place" gadget that confused my to-dos and my weather, and more novelty socks than a man with two feet could wear in a lifetime. The shame isn't that I bought these things — it's that I bought them on impulse, the way I'd buy a song I heard on the radio, without a single thought for what the money could have been doing instead. So after decades of this, I built a small checklist. Five questions. Ten seconds. Run it before any non-essential purchase, and I'd say it stops about four out of five impulse buys cold. Let me walk you through it.
The 5-Question Crap Test
Here's the whole thing in one glance. Details below.
- 1.Need or want? Am I buying this because I need it, or because I want the feeling of buying it?
- 2.Use it in a year? Will I genuinely still use this twelve months from now?
- 3.Fixing a feeling? Am I buying this to feel better about something else — boredom, stress, a bad day?
- 4.Cheaper alternative? Is there a free or much cheaper thing that does the same job?
- 5.Invest the difference? What could this money grow into if I invested it instead?
Question 1 — Do I need it, or do I just want the feeling of buying it?
This is the question that separates a purchase from an impulse. "Need" is simple: it's the new coat because your old one has a hole, the new phone because yours stopped holding a charge. "Want" is trickier, because what you're often buying isn't the object at all — it's the feeling. The small thrill of a parcel arriving. The brief status of a new thing. The comfort of treating yourself on a hard day. If I'm honest, a staggering amount of what I used to buy was never bought for the thing. It was bought for the thirty seconds of pleasant anticipation between clicking "place order" and the novelty wearing off. Ask yourself which one you're really after, and a lot of purchases quietly dissolve on their own.
Question 2 — Will I still be using this in a year?
Here's a brutal little test with an almost perfect track record: if you can't picture yourself still owning — let alone using — this in twelve months, you almost certainly won't. Gym gear you've never gym'd in. Specialist kitchen gadgets that do one thing you do once a year. "Investments" in hobby equipment for hobbies you haven't started. The stuff you buy today and trip over in six months is the clearest signal you could ask for that the purchase was never about the item. If the honest answer to "will I use this in a year?" is "no" or even "probably not," that's a near-certain skip. If it's a confident yes — genuinely, not wishfully — then it's probably a keeper.
Question 3 — Am I trying to fix a feeling?
Retail therapy is real, and it doesn't work. There's a reason the trolley is emptier and the mood is the same after a "treat yourself" browse: buying things doesn't fix feelings. It just adds a package to the feeling. When I'm bored, stressed, or having a down day, my finger hovers over the buy button far more readily than when I'm content. The honest fix for those moments isn't a healthier new purchase — it's a walk, a phone call to a friend, a decent night's sleep. If the thing you're about to buy is really a mood, the mood won't be soothed by the thing, and you'll be left with the thing and the mood. That's the worst of both worlds. Spotting that you're buying a feeling, not an object, is the single most powerful money habit I've ever built.
Question 4 — Is there a cheaper or free alternative?
Most of the things we buy have a much cheaper cousin that does the same job. The £4 daily coffee versus the kettle. The £40-a-month gym you don't go to versus walks that are free. The branded anything versus the own-brand everything. If there's a decent free or cheap option and the pricey one isn't meaningfully better for how you'll actually use it, that's not being tight — that's being smart. It's also worth a pause: is this thing actually filling a gap at all, or am I buying it because an ad told me the gap existed? The best alternative to a lot of purchases is simply not buying them, and the money quietly not leaving your account is the most stress-free saving there is.
Where the checklist lives on this site
This whole angle is the point of Buy Less Crap, so I've built dedicated tools around it. The Crap Test is a standalone interactive quiz version of exactly these questions. The 24-Hour Rule is the pause mechanism that works with it — wait overnight, then buy if you still want it. And Before You Buy Anything is a dedicated daily-use page that walks you through all five questions step by step. Start with whichever suits you — they're all the same common sense in different packaging.
Question 5 — What could this money grow into if I invested it instead?
This is the question that turns the checklist from "spend less" into "earn more," and it's the one that finally rewired me. Because a single impulse buy — say, £30 — sounds trivial on its own. But that £30 isn't the number that matters. The number that matters is what £30 becomes after a couple of decades of compound interest in a broad index fund. Plug any sum into the compound interest calculator and you'll see it: a £30 habit once a week isn't an inconvenience, it's potentially tens of thousands of pounds of future freedom. Every time I'm tempted by a shiny thing, I remind myself that the price tag isn't the real cost. The real cost is everything that money could have been — if I'd just given it some time in the market instead of handing it over for a thing I'll forget.
The bonus rule: sleep on it
Run all five questions, and you've still got one more layer of armour against yourself: don't buy today. Put it in the basket. Add it to a wishlist. Close the tab. Tell yourself you'll come back tomorrow — and if it's genuinely still a need, still worth it, and still the best option in the cold light of morning, you can buy it then. But nine times out of ten, the thing that felt essential at 10pm on a scrolling-through-Amazon Tuesday feels utterly forgettable by Wednesday lunchtime. Letting the impulse cool for a day costs you nothing — and it stops more wasteful purchases than any amount of willpower ever will. That's the whole trick behind the 24-hour rule, in one sentence.
A real example, so you can see the machine run
Say I'm tempted by a £49 "electric lunchbox" because a video told me it would revolutionise packed lunches. Q1: do I need it? No — I have a microwave and a tub. Q2: use it in a year? Be honest — probably not. Q3: fixing a feeling? Yes, I'm bored with my packed lunch and want the novelty of a gadget. Q4: cheaper alternative? A £1 plastic tub and the office kitchen. Q5: the £49 invested instead? At a rough 7% average over 20 years, that's over £180 of future value growth I'd be trading for a gadget that lives in a cupboard. Verdict: skip it, and redirect the money into my ISA. The checklist sounds simple because it is. Simple is the point.
What to do with the money you now aren't spending
The whole reason to buy less crap isn't to live miserably on nothing — it's to put that reclaimed money to work. So here's the satisfying part: the £20 here, the £30 there, the impulse buy you talked yourself out of — have it moved automatically. Set up a monthly direct debit into a low-cost global or S&P 500 ETF inside a Stocks and Shares ISA, ideally on the same day your salary lands, so the money is gone before you can be tempted to spend it. If you're brand new to all of this, Start Here is the friendliest on-ramp I've built, and it'll walk you through the ISA, the platforms, and the first transfer in plain English.
Once the money is going in automatically, resist the urge to keep an eagle eye on your balance — checking it daily just feeds the anxiety that drives impulse spending in the first place. And when temptation reappears (it will), run the checklist again, remind yourself what the money is for now, and know that saying no to a thing you didn't need is a tiny win for the future you who'll be glad you did.
For educational purposes only. Nothing in this article is financial advice or a recommendation to buy or sell any specific product or to make any particular financial decision. Everything here is what I do with my own money, and your situation is different from mine. Investing carries risk, including the risk of losing money. Past performance does not guarantee future results. Always do your own research and, where appropriate, speak to a qualified financial adviser.