How long do tins last? What the best before date means

Best before dates on tins are about quality, not safety: the Food Standards Agency says food is usually safe to eat after the date, though it may not taste as good. How long it stays acceptable depends on the product, storage and brand. The real risk is a bulging, rusty or badly dented tin: bin those.

The slightly longer answer

The Food Standards Agency’s home food fact checker says how long canned food stays acceptable after its best before date depends on the product, the storage conditions and the brand (checked 26 Aug 2026). In other words, there is no single cliff edge. A cool, dry cupboard and an undamaged tin are what matter, not the day the date passes.

Government food labelling guidance makes the principle explicit: “after the best before date, the food is usually safe to eat but may not be of the same quality”. For best before foods you can use your senses, the same guidance says, the way you’d look for visible mould on bread or smell dairy that might have soured. A tin that looks sound and smells normal when opened is telling you something useful.

The date printed is the manufacturer’s judgement of peak quality for that product, which is why one brand’s tomatoes carry a different date to another’s. Storage is your half of the bargain: keep tins somewhere cool and dry, not over the hob or in a damp shed.

Best before or use by: what’s the difference?

The guidance draws one line: “use-by dates relate to the safety of food, whereas best before dates relate to quality”. Use-by dates sit on fast-spoiling food such as fresh meat and ready meals, and eating food after a use-by date could make you ill, so those dates are firm.

Tins, dried goods and other long-life food carry best before dates instead. The same guidance adds a caveat that applies to both: food stored badly can go wrong before either kind of date, so the printed date only holds if you keep the food as the label says.

How to store and rotate tins

Write the purchase month on each tin with a marker and put new tins at the back. Check the cupboard when the clocks change in March and October, move anything within six months of its date into the week’s meals, and replace it on the next shop. This is painless if you followed the advice in emergency food for normal people and only bought tins you actually like.

Once a tin is open it stops being long-life food. The FSA says you should not store food in an opened tin, because once the contents are exposed to air the tin from the can transfers to the food more quickly. Decant leftovers into a covered container, refrigerate, and follow the label’s advice on how long the open product keeps.

What about a dented tin?

The FSA’s fact checker is reassuring about small knocks: food “should remain fit to eat if a can is dented, providing the denting of the can is shallow and there are no other obvious signs that the can is damaged”. A deep dent, especially on a seam, can compromise the seal, and a rusty tin should be thrown away.

The firm line is bulging. The FSA says you should avoid eating food from a visibly bulging can, and that a can spurting when opened may be the result of gas build-up in the food. Those tins go in the bin, whatever the date says. This is the sense in which damage, not time, is the real risk with a tin in your emergency kit.

Related questions

Can I eat food from a tin after its best before date?

Usually, yes. The FSA treats best before as a quality marker, and how long canned food stays acceptable after it depends on the product, storage and brand. Check the tin is undamaged, open it, and use your eyes and nose. If anything seems wrong, or the can spurts, bin it.

Is it safe to keep leftovers in the opened tin?

No. The FSA advises against storing food in an opened tin, because air contact speeds the transfer of tin from the can into the food. Move leftovers to a covered bowl or tub, put it in the fridge, and treat it like any other opened perishable food.

Do I need to rotate the tins in my emergency cupboard?

Yes, gently. Check the cupboard twice a year when the clocks change, eat anything approaching its date and replace it on a normal shop. Buying only tins you’d happily eat on an ordinary Tuesday makes rotation cost nothing, which is the core idea of our emergency food guide.

What should I do with a tin that spurts when opened?

Don’t eat it. The FSA says spurting can result from gas build-up in the food, and that visibly bulging cans should be avoided altogether. Bin the tin and its contents. The same goes for tins that are rusty or deeply dented, particularly along a seam or the lid.

Sources & review

• GOV.UK: Understanding food labelling: best before and use-by dates (where Food Standards Agency date-label guidance now lives; food.gov.uk redirects here). Checked 26 August 2026. Safety versus quality distinction, sensory checks, storage caveat.
• Food Standards Agency: Home food fact checker. Checked 26 August 2026. Canned food after best before, dented, rusty, bulging and spurting cans, storing food in opened tins.

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