What the Minpaku 180-Day Rule Actually Means

If you have spent any time researching whether to run an akiya as an Airbnb, you have probably come across the phrase "180-day rule." It sounds straightforward. In reality, the details matter, and those details are where many buyers get caught out.

Here's what the Minpaku 180-Day Rule actually means.

Where the Rule Comes From

The cap comes from Japan's Housing Accommodation Business Act (住宅宿泊事業法), which took effect in June 2018.

Before this law, short-term rentals existed in a legal grey area. The government introduced a framework that made home-sharing legal while imposing a significant limitation: a registered minpaku may host paying guests for up to 180 nights per year.

That trade-off sits at the center of Japan's minpaku system.

How the Minpaku 180-Day Rule Is Counted

This is the part that surprises many people.

The 180-day limit is not based on the calendar year. Instead, the minpaku year runs from April 1 through March 31.

In addition, a "day" is generally counted from noon to noon.

That means a guest who checks in one afternoon and leaves the following morning still uses one of your 180 permitted nights.

Operators are required to maintain proper records and monitor their usage carefully. Exceeding the limit is not simply bending a guideline—it means operating outside the legal framework.

The 180-Day Rule Is a Ceiling, Not a Floor

The most misunderstood aspect of the Minpaku 180-Day Rule is that 180 days is the national maximum.

Local governments are allowed to impose stricter restrictions, but they cannot permit more than 180 days.

Many municipalities do exactly that.

Examples include:

• Residential areas in Kyoto that are effectively limited to specific seasons.

• Certain Tokyo wards that restrict operating days or periods of the year.

• Municipalities that have introduced weekday bans or lower operating caps.

As a result, the practical number of nights you can legally rent may be far lower than 180.

The actual limit depends on the municipality where the property is located, making local research essential before purchasing an akiya.

What the 180-Day Rule Does to the Numbers

A standard minpaku can only operate for roughly half of the available nights in a year.

Compared with a property that can operate year-round, that creates a structural ceiling on potential revenue before accounting for:

• Occupancy rates

• Seasonal demand

• Cleaning costs

• Utilities

• Management expenses

• Maintenance and repairs

This does not automatically make a minpaku investment unprofitable.

It does mean that buyers should perform realistic financial projections before purchasing a property rather than assuming Airbnb income will cover the costs later.

Three Ways Owners Deal With the 180-Day Limit

There are essentially three approaches.

1. Accept the Cap

Many owners simply operate within the 180-night limit and use the property personally during the remaining months.

Others switch to longer-term rentals during periods when short-term operation is not permitted.

2. Obtain a Hotel Business License

Another option is obtaining a license under the Hotel Business Act (旅館業法), commonly through the Simple Lodging Permit (簡易宿所) route.

This removes the 180-day cap and allows year-round operation.

However, the requirements are considerably stricter and often include:

• Enhanced fire safety systems

• Additional facility standards

• Compliance with local zoning requirements

• Higher setup and compliance costs

For some properties, obtaining this permit may be difficult or impossible.

3. Operate in a Special Zone

Certain National Strategic Special Zones (特区民泊) permit year-round operation.

These special-zone minpaku generally allow 365-day operation, although they typically require a minimum stay of at least two nights.

However, the number of active special-zone areas has become increasingly limited.

As of 2026, active areas include parts of Tokyo's Ota Ward as well as areas in Kitakyushu and Niigata, while Osaka has suspended new special-zone applications and many surrounding municipalities have followed suit.

Because special-zone policies can change, it is important to verify current eligibility before making investment decisions.

Final Thoughts

The Minpaku 180-Day Rule is one of the most important factors in determining whether an akiya works as a short-term rental investment.

Almost every revenue projection depends on understanding:

• The 180-night cap

• How nights are counted

• Local ordinance restrictions

• Alternative licensing options

• Special-zone opportunities

Before buying any property, make sure you understand which rules apply in that specific municipality—not just what the national law allows.

Get the Full Breakdown

My Akiya & Airbnb in Japan | The Reality Guide goes deeper into the rules that most buyers miss, including:

• The 180-day cap explained in plain English

• Local ordinance traps that can drastically reduce rental days

• The differences between Minpaku, Simple Lodging, and Special Zone permits

• Real-world implications for revenue and operating costs

If you're considering buying an akiya for Airbnb income, understanding these details before you purchase can save you significant time, money, and frustration.

Disclaimer

This article is for general informational purposes only and does not constitute legal, tax, or professional advice.

Minpaku regulations vary by municipality and may change over time. Always verify current requirements with the local government office responsible for the property and consult qualified legal, tax, or licensing professionals before purchasing or operating a property.