ISA added labour/social insurance records and tax certificates, among other attachments, to the SSW periodic report, with a grace period allowing certain certificates to be submitted after 31 May.
On 20 May 2026 (Reiwa 8), the Immigration Services Agency (ISA) published a follow-up to its earlier announcement that the SSW periodic report moved to an annual filing. 「今年度から、特定技能制度における定期届出の提出は、年4回の提出から年1回の提出に運用が変更となり、4月1日から5月31日の間に提出することとなりました。」 ("From this fiscal year, the periodic report under the Specified Skilled Worker (特定技能) system has moved from four filings a year to one, to be submitted between 1 April and 31 May.")
Accepting organisations and registered support organisations should identify early which attachments have been added and which items qualify for the grace period.
Source: Immigration Services Agency (notice) / Periodic reporting system page