SSW Periodic Reports Changed in 2026: Annual Filing, Attachment Checks, and the May 31 Deadline

Japan's Specified Skilled Worker periodic reporting system is now an annual filing system. The key date is April 1, 2026: from that date, the rules for 定期届出 changed substantially.

This is not just a paperwork clean-up. For companies employing Specified Skilled Worker employees, the risk is simple: if your notifications are not properly handled, you may become unable to accept SSW workers.

Who's affected

This mainly affects:

• Specified Skilled Worker host organizations — companies or sole proprietors that employ SSW workers
• Registered support organizations that have been entrusted with all support for SSW Type 1 workers
• HR, immigration, and admin teams preparing annual SSW filings
• SSW workers indirectly, because employer filing problems can affect the employer's ability to keep accepting SSW staff

The filing duty sits with the host organization. Even if support is outsourced to a registered support organization, Immigration makes clear that the host organization is the one submitting the periodic notification.

What changed

The old quarterly cycle has been replaced by an annual cycle.

Immigration's notice says the final quarterly periodic filing was the one to be submitted by April 15, 2025. The next periodic filing is from April 2026 onward, and after that a periodic report is required once a year.

The current annual structure is:

• Covered period: April 1 to March 31 of the following year
• Submission deadline: May 31 of the following year
• If May 31 is a weekend or public holiday: submit by the next Immigration office business day
• Submitter: the Specified Skilled Worker host organization
• Documents: check the official submission-document list and the periodic-report preparation guide

Immigration also published and updated practical materials around the new system:

• the periodic notification preparation guide, published on January 26, 2026
• revised submission-document lists, including updates on February 12, 2026
• online filing explanation videos, published on April 28, 2026
• a collection of common mistakes, published on May 8, 2026
• a Q&A and a notice on attachment documents for periodic reports, published on May 20, 2026

The attachment-document trap

The headline change is annual filing, but the practical headache is the supporting documents.

Immigration points employers to the official submission-document list and preparation guide for what must be filed. That matters because the annual report is not just a form saying "we still employ this person." It covers the status of acceptance, activities, and support implementation.

If the host organization has outsourced all support to a registered support organization, the host organization must also compile and submit the registered support organization's support-implementation status.

For registered support organizations, the required periodic materials include:

1. the form on the status of acceptance, activities, and support implementation
2. the signature-page form for the notification on that status

There is one important filing-method distinction: where the filing is not online and the host organization has outsourced all support to one registered support organization, Immigration says the signature-page form listed above is not required.

The risk for employers

Immigration states the consequence directly: if notifications from a Specified Skilled Worker host organization are not properly fulfilled, the organization may become unable to accept SSW workers.

That is a serious operational risk. It can affect recruitment, renewals, transfers, and the basic ability to keep using the SSW system.

There is also a risk on the support-provider side. If the host organization does not submit the support status from the registered support organization, the registered support organization's registration may be revoked.

What registered support organizations need to do

If you are a registered support organization entrusted with all support for SSW Type 1 workers, do not wait until the employer asks in May.

You should:

• prepare the support-implementation materials early
• confirm whether the host organization will file online or on paper
• confirm whether support is outsourced to one registered support organization or more than one
• provide the required materials to the host organization in time for the May 31 deadline
• keep your internal records aligned with the forms and preparation guide

The official structure makes you dependent on the host organization's filing, but your registration risk can still be affected if support-status materials are not submitted.

What host organizations should do now

Build an annual filing calendar around March 31 and May 31.

At minimum:

• identify every SSW worker covered during the April 1–March 31 period
• confirm which registered support organization, if any, handled support
• collect support-implementation materials before the deadline rush
• use the latest official submission-document list, not an old quarterly template
• check the common-mistakes material before filing
• consider using the online filing guidance videos if you file electronically

The biggest mistake would be assuming "annual" means "less important." It means fewer filing windows — and fewer chances to notice that your documents are wrong before the deadline.

Bottom line

From April 1, 2026, SSW periodic reporting is an annual compliance event with a May 31 filing deadline. The host organization owns the filing duty, even where a registered support organization performs all support work.

If you employ SSW workers, treat this as a yearly immigration audit pack: gather the acceptance, activity, and support records early, check the latest attachment-document list, and do not rely on old quarterly filing habits.

Sources: Immigration Services Agency — Notifications by SSW host organizations and registered support organizations · Immigration Services Agency — Specified Skilled Worker system

Common questions