Earthquake Insurance in Japan (地震保険)

Most foreign residents in Japan assume that the home insurance bundled with their apartment lease will cover earthquake damage. It usually does not. Earthquake coverage in Japan is a separate, government-backed product called 地震保険 (jishin hoken), and you have to add it on deliberately. In a country this seismically active, it is worth understanding exactly what it does and does not cover before you decide.

Your fire insurance does not cover earthquakes

Standard home insurance in Japan is 火災保険 (kasai hoken), or fire insurance. Despite the broad-sounding name, it specifically excludes damage caused by earthquakes, eruptions, and the tsunami that follow them — including fires that start because of an earthquake. To be covered for those, you need to add earthquake insurance.

How 地震保険 works

Earthquake insurance in Japan is a national scheme, backed by the government and offered through private insurers on standardized terms. Two key rules follow from that:

• It is an add-on to fire insurance. You cannot buy 地震保険 on its own — it must be attached to an existing 火災保険 policy.
• Coverage is capped at 30–50% of your fire insurance amount, within national limits of up to ¥50 million for a building and ¥10 million for contents (家財). It is designed to help you restart life after a disaster, not to fully rebuild.

What it covers — and what it doesn't

Covered:

• Damage to your building and/or household contents caused by an earthquake.
• Fire caused by an earthquake (which ordinary fire insurance excludes).
• Damage from tsunami and volcanic eruptions triggered by seismic events.

Generally not covered:

• Vehicles (cars are covered under separate auto insurance, if at all).
• Temporary housing or living costs while you are displaced.
• Business property and certain high-value items.

Renters: insure your contents (家財)

If you rent, you do not own the building, so building coverage is the landlord's concern. What you can and should consider insuring is your 家財 (household contents) — furniture, appliances, electronics, and belongings. Renters typically take out a 火災保険 contents policy and add 地震保険 for the contents portion.

The 4-tier damage scale

Payouts are based on a standardized four-level assessment of the damage rather than itemized repair costs:

• 全損 (total loss) — the highest payout tier.
• 大半損 (major half loss)
• 小半損 (minor half loss)
• 一部損 (partial loss) — the lowest payout tier.

Each tier pays a set percentage of your insured amount, which makes claims faster to settle after a large disaster.

What does it cost?

Premiums depend heavily on your prefecture (seismic risk) and your building's structure and age, but a rough range is around ¥10,000 to ¥30,000 per year for typical residential coverage. Higher-risk regions and wooden buildings cost more; newer, earthquake-resistant buildings can qualify for discounts.

There's a tax deduction

Earthquake insurance premiums qualify for the 地震保険料控除 (earthquake insurance premium deduction), which can reduce your income tax. The deduction is worth up to ¥50,000 of premiums against national income tax (with a separate, smaller amount for resident tax). Keep the certificate your insurer sends and claim it on your year-end adjustment or tax return.

Is it worth it?

If you live in a higher-risk area — much of the Pacific coast, Tokyo, Tokai, and Nankai trough regions — and you own valuable contents or your home, earthquake insurance is generally worth serious consideration. The payout will not make you whole, but it can be the difference between a manageable restart and a financial catastrophe. Weigh the annual premium against what you would lose, and remember the tax deduction offsets part of the cost.