Most likely to catch you out
- 1“Temporary Visitor” status bars income-earning — and that reaches free accommodation given for care, so an unpaid sit isn't clearly outside it; answer border questions truthfully, and weigh that before you commit.
- 2A routine medicine cabinet can mean trouble at customs — pseudoephedrine cold remedies (Sudafed, some Vicks inhalers) and ADHD stimulants like Adderall are banned or need an import certificate obtained before you fly.
- 3Driving needs a 1949-Geneva international permit (the 1968 type is invalid here), the drink-drive limit is near-zero — and a passenger, the car's owner, and whoever served the drink can all be charged.
- 4Carry your passport at all times — a short-stay visitor must, and the police can ask to see it; a photocopy doesn't count.
Where you sit changes what matters
The same law lands differently depending on which chair you're in.
- “Temporary Visitor” status bars income-earning, and that reaches free accommodation given for care — so an unpaid sit isn't clearly outside it. No sitter case is on record, but enforcement is strict: answer border questions truthfully, and weigh that before you commit.
- Check your medicine cabinet before you fly — pseudoephedrine cold remedies (Sudafed, some Vicks inhalers) and ADHD stimulants like Adderall are banned or need an import certificate, and a foreign prescription doesn't make them legal here.
- Driving needs a 1949-Geneva international permit (a UK one is right; the 1968 type is invalid), and the drink-drive limit is near-zero — with a passenger, the car's owner and whoever served the drink all liable. And there's no reciprocal healthcare, so carry insurance with evacuation.
- Once the pet's in your care its welfare is your legal duty — cruelty is a serious crime that reaches anyone, not just the owner. The relief: Japan is rabies-free, so a bite from a registered pet is low-risk (still clean and watch it).
- A dated, rent-free sit is a loan-for-use, outside Japan's strong tenancy law — but if a sitter overstays you still can't change the locks; recovery is a court matter. Keep it dated and genuinely rent-free.
- Disclose any camera — recording is lighter here than on the Continent (one-party consent), but a hidden camera in a bedroom or bathroom is a serious crime.
- Check whether your motor policy covers another driver before you leave the keys — many Japanese policies are limited to family or carry an age condition, so a sitter may not be covered unless you confirm it or add them.
- Leave written authorisation for emergency vet care with a spending cap — no rule lets a sitter authorise treatment alone, and Japanese vets are cautious about euthanasia, so spell out who decides.
The things worth getting right
Where the honest answer is “it depends”, we say so, and point you to the official source.
Immigration & “is sitting work?”
Japan admits most visitors visa-free for up to 90 days as a “Temporary Visitor,” but that status is for tourism — and because the work bar reaches payment in kind, free accommodation given in exchange for care isn't clearly outside it.
UK and many Western visitors enter visa-free as “Temporary Visitor” for up to 90 days — a status that, in the government's own words, is for people “not going to be engaged in income-earning activities.” Crucially, the prohibition reaches compensation that is “both financial and material,” so free accommodation given in exchange for pet and home care sits inside it, not safely outside. It's a genuine grey area — no rule squarely addresses housesitting, no case of a sitter being stopped is on record — but enforcement here is strict, so answer border questions truthfully, and weigh that before you commit. The 2024 digital-nomad status is for remote work paid by a foreign employer, not local sitting.
Cameras, recording & privacy
Japan is effectively one-party consent: a person who is part of a conversation may record it (the Supreme Court has upheld this), so a sitter can record their own handover. Recording or bugging a conversation you are NOT part of isn't a crime here — it's a civil wrong (a privacy tort) the other person can sue over — Japan has no general criminal eavesdropping law. The hard criminal line is narrower and about images: secretly filming someone's intimate areas or a sexual act is a crime under the 2023 “photography” law (up to three years), so a hidden camera in a bathroom or bedroom is squarely criminal. A home security camera for personal use is largely outside the data law, but the clean course is to disclose every camera and keep them out of the sitter's private space.
Consent: One-party for participants; disclose cameras; no hidden cameras in private spaces. Most camera disputes here are handled civilly — but a camera in a private space is criminal almost everywhere.
Animals & the law
You need no certificate to mind a pet, but Japan's Act on Welfare and Management of Animals puts the proper-care duty on “the owner or possessor,” so a sitter in charge is bound — and the cruelty offences reach “a person,” not just the owner: killing or injuring an animal without due cause carries up to five years' imprisonment or a ¥5 million fine, neglect or abandonment up to one year. The good news on health: Japan is rabies-free (no case in animals since 1957) and keeps it that way with strict import quarantine, so a bite from a registered pet is low-risk — clean it and watch it, but the rabies fear that haunts much of Asia doesn't apply here. (A dog must by law be registered and vaccinated every spring; that's the owner's job, though the vaccination duty can technically fall on whoever is keeping the dog — rarely an issue on a short sit.)
Driving the owner's car
You need an International Driving Permit issued under the 1949 Geneva Convention — Japan does NOT accept the 1968 Vienna type. A UK permit is the right one; French, German, Swiss, Belgian, Monégasque and Taiwanese licences aren't (those drivers need an official Japanese translation instead). Valid one year from entry; Japan drives on the LEFT.
Japan's compulsory insurance (jibaiseki) covers injury to other people only — never the car or property; the owner's VOLUNTARY policy covers those. The catch for a sitter: Japanese voluntary policies are often limited to the owner and family or carry an age condition, and a sitter is neither family nor automatically covered — so confirm the policy allows any driver (or have yourself added), and check the age terms, before you drive.
Drink-drive limit: 0.03% (0.15 mg/L breath). That near-zero limit is a crime, not a fine-and-points matter: up to five years' imprisonment or a ¥1 million fine in the worst tier. And it reaches further than the driver — a passenger who rides with a drinking driver, whoever lent the car, and whoever served the alcohol can each be charged in their own right. So behind someone else's wheel the safe number is none — and don't get in, either.
The home — licence, not tenancy
Japan protects tenants strongly — under the Act on Land and Building Leases a landlord needs “just cause” to refuse renewal, and eviction is genuinely hard. But that law only attaches to a LEASE. A rent-free housesit is a “loan for use” (shiyō taishaku, Civil Code), to which those tenant protections don't apply: the owner can end it on the agreed date or when its purpose is done, and may end it at any time if no period or purpose was fixed (Civil Code art. 597–598). The line is rent: take money and it becomes a lease, and the strong protections attach. As everywhere, there's no lawful self-help — an owner can't change the locks or remove belongings; recovering possession from someone who won't leave is a court matter (months). So keep it dated, rent-free, and documented as a temporary care arrangement.
Safeguard: A dated, written, rent-free agreement reciting no rent, a fixed end date and the care purpose — it keeps the sit a loan-for-use (outside the strong tenancy law) and proves the occupancy was temporary and by permission.
Courts, claims & “is it worth pursuing?”
Japan has a genuinely quick small-claims track — money claims up to ¥600,000 decided in a single-day trial in the Summary Court (above that, up to ¥1.4 million, an ordinary Summary Court claim). It's cheap and fast against someone still in Japan with reachable assets. Against a departed sitter it's impractical — not because Japan won't take the case, but because serving someone abroad has to go through slow formal channels that defeat the one-day design, and enforcing a Japanese judgment overseas dwarfs a sitting-sized sum. For a sum this size a court rarely pays its way, so what helps most is agreeing clearly in writing before the sit.
Small Claims Litigation (少額訴訟) in the Summary Court — a one-day trial — claims up to ¥600,000 (the Summary Court handles ordinary civil up to ¥1.4 million).
At home vs. across a border
A handful of these answers flip entirely depending on whether you’re local or visiting from abroad. The rest bind whoever’s standing there.
Sitting at home (a resident)
No immigration question. Your own healthcare and cover. A small money dispute is a quick one-day Summary Court trial — cheap against someone still in Japan.
Visiting from abroad
The “is this work?” question is real but unsettled, and there’s no reciprocal healthcare, so carry insurance — and a dispute that crosses back out of Japan is slow and uncertain to enforce. If the sit is unpaid, take your signed agreement with you. It shows what the two of you actually agreed.
The next tier
Tax & money
Free accommodation has no specific Japanese tax ruling for an informal sit, and a short-stay visitor with no Japan-source income owes no Japanese income tax. Only local pay would be taxable (and an immigration breach on top).
Emergencies & healthcare
No reciprocal healthcare with the UK — Japan's national insurance is for residents, so a visitor pays the whole cost, often up front, and a hospital can decline non-urgent care without proof you can pay. Care is excellent but expensive; travel insurance covering treatment and medical evacuation is essential.
Guests & registration
There's no routine short-stay registration for a private sit (residence registration is for longer stays; hotels register their guests, but a housesit doesn't). One real duty does attach to the visitor, though: a short-stay foreigner must carry their PASSPORT at all times and show it to a police or immigration officer on request — a photocopy doesn't satisfy it, and not carrying it is itself an offence.
Your data & privacy
Privacy law: APPI (Personal Information Protection Commission). Japan is one-party consent — a participant may record a conversation they’re in; recording others is a civil wrong, not a crime — but a hidden camera in a private space is criminal.
Tall tales, checked
Sorted into myth, part true and true. The ones particular to this country each carry a source; the last two are about how agreements work everywhere.
“Your cold medicine could get you arrested.”
James packs for three weeks minding Sarah's Osaka flat and drops his usual Sudafed and his ADHD tablets into his wash bag. At customs both are flagged — the pseudoephedrine as a banned “stimulant raw material,” the ADHD medicine as a prohibited stimulant — and no prescription saves either. The sit begins with a customs interview instead of a key handover.
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Most travel medicine is fine, but Japan bans specific everyday drugs that are legal elsewhere. Cold and allergy medicines containing more than 10% pseudoephedrine (which catches some Sudafed and Vicks inhaler products) count as “stimulant raw materials” and can't be brought in, and stimulant ADHD medicines such as Adderall (amphetamines) are banned outright — they can't be brought in even with a prescription or an import certificate. For permitted medicines, broadly up to a month's prescription supply (or a couple of months of over-the-counter) may be carried without paperwork; beyond that you need an import certificate (a Yunyu Kakunin-sho), applied for online before you fly. Customs makes no on-the-spot exceptions, and bringing a prohibited drug risks detention.
US Embassy Japan · bringing medication into Japan ↗“You can be arrested just for being the passenger of a drink-driver.”
After the handover dinner Sarah offers James a lift back to the house and orders a second beer with her meal. James, stone-sober, climbs into the passenger seat. In Japan that single choice can put him in the dock beside her — knowingly riding with a driver who's been drinking is its own offence.
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Japan's Road Traffic Act punishes not just drink-driving but three “surrounding” acts, each a separate crime since the 2007 amendment: lending the car, supplying the alcohol, and accepting or asking for a ride from someone you know has been drinking. The passenger and the drink-supplier face up to two or three years; whoever provided the vehicle is punished as harshly as the driver (up to five years or a ¥1 million fine). With a near-zero limit, the lesson is blunt: if the driver's been drinking, don't pour it, don't lend the car, and don't get in.
OIST · drink-driving law in Japan ↗“Your international driving permit won't work in Japan.”
James (British) and his friend Pierre (French) plan to share the driving on Sarah's rural sit. James's UK international permit waves him through the rental counter; Pierre's French one is worthless here — and without an official Japanese translation of his licence, Pierre simply can't drive.
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Japan recognises only International Driving Permits issued under the 1949 Geneva Convention. The UK issues that type, so a British visitor is fine. But France, Germany, Switzerland, Belgium, Monaco and Taiwan don't issue 1949 permits — their drivers can't use an IDP at all and instead need an official Japanese translation of their home licence (from the motoring federation JAF or their embassy). Either route is valid for one year from the date you enter Japan. Turning up with the wrong permit means driving unlicensed.
JAF · driving in Japan (which IDP is valid) ↗“Japan has no rabies, so a dog bite is nothing to worry about.”
Sarah's elderly terrier nips James on day two and he shrugs it off — “Japan's rabies-free.” The rabies part is true; the bite still needs cleaning and watching, because ordinary wound infection doesn't care about national statistics.
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Japan genuinely is rabies-free — no animal case since 1957, no local human case since 1956 — kept that way by the Rabies Prevention Act and strict import quarantine (an arriving pet can face up to 180 days if the paperwork isn't done in advance). So a bite from a registered Japanese pet carries none of the rabies risk it would in much of Asia. But “nothing to worry about” overstates it: any bite can become infected, and the rabies-free status is maintained by law — every dog must be registered and vaccinated each spring, with a fine for failing.
MAFF Animal Quarantine Service · importing pets (rabies control) ↗“It's illegal to take a silent photo — every phone has to make a shutter sound.”
James wants a quiet shot of Sarah's sleeping cat and is annoyed his phone clicks loudly — he's heard the shutter sound is “the law” in Japan. It isn't; no statute requires it. What the law does punish, hard, is the behaviour the loud click was meant to deter.
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No Japanese law mandates a camera shutter sound — it's voluntary industry self-regulation, phones sold in Japan ship with a non-silenceable click to deter sneak photography (an imported handset may be silent). Taking a quiet photo isn't a crime. What IS a crime, nationwide since 2023, is secretly photographing someone's intimate areas or a sexual act without consent — up to three years, or five for sharing the images. So the click is a custom; the real rule is about hidden cameras in private moments.
Tokyo Weekender · why you can't silence the shutter (it's self-regulation) ↗“Borrowing the owner's bike is harmless — bikes aren't really regulated here.”
James borrows Sarah's bicycle for the evening and has a couple of beers at a local izakaya before pedalling home, reasoning a bike isn't a car. In Japan it more or less is: a bicycle is a “light vehicle,” and riding it after drinking is the same family of offence as drink-driving.
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Japanese law treats a bicycle as a light vehicle under the Road Traffic Act, so the drink-drive rules apply — drunk cycling can carry serious penalties. Recent reforms have sharpened this: from late 2024 there are explicit penalties for using a smartphone while cycling, and from 2026 a new fixed-penalty (“blue ticket”) system covers minor cycling offences like riding on the pavement or wearing earphones. A sitter who uses the owner's bike should ride it as carefully as the car.
The Japan Times · road-traffic-law revisions for cyclists ↗“You must carry your passport everywhere, and the police can stop you for it.”
Three days in, James leaves his passport in the flat's safe and walks to the convenience store. A routine police check stops him on the way back — and as a short-term visitor he was legally required to have that passport on him. Leaving it “somewhere safe” is itself the offence.
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Under the Immigration Control Act a short-stay visitor must carry their actual passport, not a copy, and show it when a police or immigration officer asks. Failing to carry it, or refusing to show it, is a criminal offence punishable by a fine of up to ¥100,000. (Longer-term residents carry a residence card instead, and refusing to show that can mean up to a year's imprisonment.) Routine street checks of foreigners do happen, so keep it on you.
Immigration Control and Refugee Recognition Act, art. 23 (official translation) ↗“It's unpaid and nothing's in writing, so there's no real agreement — and nothing's enforceable.”
James agrees to mind Sarah's flat and her two cats for a fortnight while she's away — no money, nothing signed, just a few texts and a chat at the door. Sarah comes home, blames him for a scratched table, and insists there was never a 'real' agreement to break. But there was: each of them gave the other something they wanted — James's care in return for Sarah's keys and a roof over his head — and that swap is exactly what the law treats as a deal, cash or no cash. What Sarah would struggle to pin down isn't the missing money; it's what the two of them actually agreed in the first place.
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Money isn't the test. Across legal systems, what makes an arrangement binding is that two people genuinely agreed to it and meant it to count — not whether cash changed hands or anything was signed, and it can be spoken or shown by conduct rather than written down. (Some systems look for something given on each side — here, James's care for Sarah's keys and a roof; others ask only that the promise was seriously meant. A housesit clears either bar.) So 'no cash, nothing signed' is the wrong line everywhere. The subtler, equally universal catch: a purely social favour can fall short of an intended legal commitment, and even a binding deal is painful to prove once memories differ. Agreeing clear terms up front helps with both, which is the point of agreeing them.
“A handshake or a few texts can't be a real contract — it has to be a formal signed document.”
Sarah and James set the whole sit up over WhatsApp — the dates, the dog's walks, who covers the heating — and because nothing's signed, James assumes none of it really counts. It does. A deal struck by text, or with a nod at the door, can bind just as tightly as a printed page. The paperwork was never the magic; it's the receipt, so neither of them can later 'remember' it differently.
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In most systems an agreement can be oral or formed by conduct; a signature and a formal document aren't what make it binding. What's hard about an informal deal isn't its validity — it's proving what was actually agreed once memories differ. Writing the terms down doesn't create the obligation; it records it, so nobody has to argue about it later.
Read another country
Same shape everywhere — the things most likely to catch you out, wherever you’re headed.