How to Decide What to Keep: Rules for Things That Are Hard to Let Go
- In the classic 1990 experiment on the endowment effect, students given a coffee mug wanted a median of $5.25 to sell it, while students without one offered $2.25 to $2.75 to buy it.
- Money already spent is gone whether the item stays or goes, so the only live question is whether it earns its space from now on.
- HMRC asks most people who file a Self Assessment return to keep records for at least 22 months after the end of the tax year, and self-employed people for at least 5 years after the 31 January deadline.
- The IRS advises keeping tax records for 3 years in most cases, 6 years if income was under-reported by more than 25%, and 7 years after a claim for worthless securities or bad debt.
- In a field study at a donation drive, prompting people to photograph sentimental items first increased the number they donated.
Nine-tenths of a clear-out is easy. The lidless tubs, the dead chargers and the jeans from two sizes ago more or less sort themselves. Then you reach the fondue set from your late aunt, the £400 coat worn twice and a carrier bag of bank statements from 2014, and the whole project stops.
This guide is about that last tenth. It sets out a rule for each of the six categories that stall people, the record-keeping periods that HMRC and the IRS publish, and a holding-box method for anything you still cannot call. If you have not started yet, the room-by-room decluttering plan comes first.
Why is it so hard to get rid of things?
Partly because owning a thing changes what you think it is worth. Economists call this the endowment effect, and the best-known demonstration is a 1990 paper by Daniel Kahneman, Jack Knetsch and Richard Thaler.
In one of its experiments, 44 Cornell students sat in a classroom and half were handed a university coffee mug. Owners were asked what they would sell it for, and the others what they would pay.
The mugs were identical and had been owned for minutes. Across four rounds, the median seller wanted $5.25 and the median buyer offered between $2.25 and $2.75. When students traded tokens with a fixed cash value instead, trading ran as predicted, which suggests the effect belongs to objects people can imagine using.
These were undergraduates, the stakes were a few dollars, and a classroom is not a loft. Still, the result matches what happens at a wardrobe door: the jacket you would walk past in a shop for £15 becomes, once it is yours, far too good to give away.
Which questions should you ask?
One question does not suit every category. These are the ones that work, with a default for when you are still stuck after 30 seconds.
| Category | Ask this | If still stuck |
|---|---|---|
| Sentimental items | Is this the best single object from that person or time, or one of twenty? | Keep the best one to three, photograph the others |
| Gifts | Would the giver want me to keep something I do not use out of obligation? | Rehome it; the thanks were the transaction |
| "Might need it" | Could I replace it for under £20 or $25 within a day? When did I last need it? | Holding box with a six-month date |
| Expensive mistakes | If I did not own this, would I buy it today at its resale price? | List it for sale for 14 days, then donate |
| Paperwork | Does a tax authority, insurer, lender or warranty still require it? | Scan it, then keep the original until the period in the paperwork table has passed |
| Inherited things | Do I like it and have a place for it, or am I storing it on behalf of the dead? | Offer it round the family with a deadline, then sell or donate |
What do you do with sentimental items?
Do them last, and do them by selection. The memory is attached to the person or the time, and one good object carries it as well as a crate of middling ones. Choose the one to three best things from each person or period: the recipe book in your grandmother's handwriting, not her six saucepans.
Set a physical limit before you start. One lidded box per person in the household, around 60 litres, is generous and still fits on a wardrobe shelf. When the box is full, something has to come out before something else goes in.
Photograph the things you release. There is some evidence that this helps: in a study published in the Journal of Marketing, a donation drive that encouraged people to photograph sentimental possessions before giving them away collected more donations than one that did not.
The researchers' explanation was that the photo preserves the memory, so parting with the object feels less like losing part of yourself. It was a study of donation behaviour, not of how people felt a year later, so take it as a useful nudge and no more.
Is it rude to get rid of a gift?
No. A gift does its work at the moment it is given: someone thought of you, you thanked them, and the exchange was complete. Nothing in that obliges you to store a scented candle you dislike for a decade.
Three practical rules help. Wait until the occasion has passed and thank-yous are done. Rehome it outside the giver's circle: a charity shop in the next town, not the school fair. If a particular relative checks on their gifts, keep that one vase and bring it out for visits.
What about things you might need one day?
"Just in case" is the largest category in most homes, and the hardest to argue with, because one day you might indeed need a third colander. Two numbers settle most of it: the cost to replace and the date last used.
If you could replace the item for under £20 or $25 within a day, and you have not used it for a year, let it go. A version of this rule was popularised by the writers behind The Minimalists, who use $20 and 20 minutes.
The logic is insurance: you are paying, in space and clutter, to insure against a small, unlikely expense. Spare cables, duplicate utensils, odd screws, old phone boxes and most of the "useful" jars fall here.
Keep things that fail the cost test but pass a realistic-use test: the drill, the camping stove, the formal outfit, a basic tool kit, a torch and the spare key. Keep one spare of consumables you would be stuck without, such as a light bulb of each fitting. Kit for a hobby untouched in three years will sell.
What about expensive things you never use?
This is the sunk cost problem. You paid £400 for the coat, £250 for the exercise bike or $600 for the stand mixer, you do not use it, and getting rid of it feels like admitting the money was wasted.
The money was spent on the day you bought it. Keeping the item does not bring any of it back, and the cupboard space it occupies is a second, continuing cost.
Look up what the item sells for secondhand today. Search completed listings, not asking prices. That figure, not the receipt, is what the item is worth to your household. Then ask the buyer's question: would you pay that for it now? If yes, start using it this week. If no, sell it.
Expect 20% to 50% of the new price for clothing and small appliances in good condition, and less for anything bulky or dated. These are rough working figures from watching resale listings, not survey data. Give the listing 14 days, drop the price once, then donate.
How long should you keep paperwork?
Shorter than most people think, with a few exceptions that matter. The periods below come from the tax authorities' own pages. They are minimums, and they are general information: if your affairs are complicated or you are in a dispute, ask an accountant before shredding anything.
| Situation | UK (HMRC) | US (IRS) |
|---|---|---|
| Standard personal tax return | At least 22 months after the end of the tax year the return is for (15 months from sending it, if you filed late) | 3 years in most cases |
| Self-employed or business records | At least 5 years after the 31 January submission deadline for that tax year | 3 years in most cases; employment tax records at least 4 years |
| Special cases | Self-employed and more than 4 years late with the return: 15 months after sending it | 6 years if you did not report income that was more than 25% of the gross income on your return; 7 years after a claim for worthless securities or bad debt; indefinitely if no return was filed |
| Property and investments | Not covered on the pages cited here. A sensible default is to keep purchase and improvement records for as long as you own the asset, and to ask an adviser about capital gains | Keep until the period of limitations expires for the year in which you dispose of the property |
The UK figures are from gov.uk's guidance on pay and tax records and its page for the self-employed. The US figures are from the IRS page on how long to keep records.
As a worked example, records for the 2024 to 2025 tax year, filed on time, should be kept until at least the end of January 2027 if you are employed and file a return, and until at least the end of January 2031 if you are self-employed.
Beyond tax, keep for life: birth, marriage and divorce certificates, wills, pension statements, property deeds, and anything showing national insurance or social security contributions. Keep while current: insurance policies, tenancy or mortgage agreements, warranties and the receipt stapled to them, vehicle documents.
Almost everything else (utility bills, routine bank statements available online, appliance manuals that exist as PDFs) can be scanned and shredded once it is a year or two old. Shred anything with an account number or your date of birth on it.
What do you do with inherited things?
Inherited belongings combine every difficulty above: sentiment, obligation, and sometimes real money. Give yourself time. Nothing has to be decided in the first months after a death unless a property must be cleared, and decisions made in the first weeks are the ones people most often regret in either direction.
When you are ready, separate two things that tend to get blurred. Keeping the person's memory is served by a few chosen objects and photographs. Respecting their wishes is served by offering items to the people they would have wanted to have them. Circulate photos to family with a clear date, and take silence as a no.
For furniture, check two things before you try to pass it on. In the UK, charities such as the British Heart Foundation cannot sell upholstered furniture without a fire safety label attached, so a 1970s sofa without one will be refused. Furniture made before 1950 is exempt from those rules and may interest an auction house instead.
In the US, Habitat for Humanity ReStores accept furniture and household goods, and many offer free pickup of large items. For jewellery, watches, silver or art, pay for one independent valuation before doing anything.
If letting go feels impossible
Finding this hard is ordinary. Being unable to discard anything, to the point where rooms cannot be used and the subject causes real distress, can be a sign of hoarding disorder, which the NHS recognises as a mental health condition that can be helped with talking therapy.
Speak to a GP in the UK, or your doctor or a licensed mental health professional in the US. If a bereavement is what has stopped you, a GP or doctor can also point you towards bereavement support.
How does a holding box work?
The holding box is for everything that survives the questions above without an answer. It turns a decision you cannot make today into a test that runs by itself.
1. Box it
Use one box with a lid, no larger than about 60 litres. Put the undecided items in. If the box fills up, you are avoiding decisions, so take the easiest five things back out and decide on them now.
2. Date it
Seal it with tape. Write a date six months ahead on the lid in marker pen, and put the same date in your phone calendar. Six months covers both a summer and a winter's worth of "I might need it". Do not write a contents list: if you cannot remember what is inside, that is the result of the test.
3. Store it somewhere slightly inconvenient
The top of a wardrobe or the back of the garage is about right. If you need something, open the box, take that item out and give it a permanent place. It has passed.
4. On the date, do not open it
Take the sealed box to the charity shop or donation centre. Opening it restarts the endowment effect, and you will find yourself holding a garlic press and feeling that it has always been dear to you.
One box at a time per household is the rule. Used once, this clears the last tenth of a declutter. Used as a habit, it becomes a slower way of keeping everything.
Questions readers ask
What is the 90/90 rule for decluttering?
It asks whether you have used an item in the past 90 days and whether you will in the next 90. If both answers are no, it goes. It suits clothes, kitchen equipment and toiletries. It suits seasonal things such as a winter coat or a tent badly, so use a 12-month window for those.
How do I decide which of my children's artwork and schoolwork to keep?
Keep a fixed number per school year, two or three pieces, chosen with the child if they are old enough. Photograph the others, and date the photos in an album on your phone. Store the keepers flat in one A3 folder per child. By age 18 that is around 40 to 50 pieces, which someone might look through one day.
What if I regret getting rid of something?
It happens occasionally, and it is usually survivable: most regretted items cost under £30 or $40 to replace. Weigh one or two small regrets against the hundreds of things you will never think about again. For anything irreplaceable, the holding box and the photograph exist to make regret unlikely.
Sources
- Kahneman D, Knetsch JL, Thaler RH. Experimental tests of the endowment effect and the Coase theorem. Journal of Political Economy. 1990;98(6):1325–1348.
- Winterich KP, Reczek RW, Irwin JR. Keeping the memory but not the possession: memory preservation mitigates identity loss from product disposition. Journal of Marketing. 2017;81(5):104–120.
- GOV.UK. Keeping your pay and tax records: how long to keep your records.
- GOV.UK. Business records if you're self-employed: how long to keep your records.
- Internal Revenue Service. How long should I keep records?
- British Heart Foundation. Book a free furniture and electrical goods collection.
- Business Companion (Chartered Trading Standards Institute). Second-hand upholstered furniture: fire safety. Reviewed October 2025.
- Habitat for Humanity. Donate goods to Habitat ReStore.
- NHS. Hoarding disorder.
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