UK, EU, and Other Social Security Treaties with Japan

UK Japan pension treaty questions share one starting rule with every other non-US bilateral: read your own country's row and borrow nothing from a neighbor's.¹ The United Kingdom, Germany, Korea, and Brazil each hold an agreement with Japan, but scope and procedure differ per text.¹

Confirm current details with official sources

Procedures, fees, and requirements can change. Confirm current details at the Japan Pension Service English pages. This article is general information, not legal, tax, or immigration advice; for your specific case, consult a licensed social insurance labor consultant (sharoushi) for your bilateral scope.

Overview

Japan's non-US treaties follow the same two-function shape as the US one: posting relief for temporary transfers plus totalization of periods toward vesting.¹ The similarity ends at the shape. Covered risks, posting caps, and totalization boundaries vary, so each section below stands alone for its own bilateral.¹

US readers belong in the US-Japan companion guide, not here. No section below generalizes to the 2005 US agreement.¹

UK-Japan specifics

The United Kingdom agreement with Japan covers old-age, disability, and survivors.¹² It eliminates double contributions for postings of up to five years and permits totalization of United Kingdom and Japanese periods toward each country's minimum.¹

The United Kingdom-side document is issued through HMRC channels for outbound assignments.² The transferee routes it through the Japanese employer to the pension office, which records the Japan-side exemption for the posting window.²³

Germany-Japan specifics

The Germany agreement with Japan is similarly comprehensive, with posting relief through the Certificate of Coverage and totalization permitted toward each side's minimum.¹⁴ Salaried postings use the standard certificate flow rather than a separate bilateral form.⁴³

The German-side issue runs through the pension insurance or competent fund path for the posting type.⁴ As with the United Kingdom flow, the certificate must be on file before Japan payroll treats the transferee as exempt.³

Korea-Japan specifics

The Korea agreement with Japan covers posting relief during the transfer window.¹⁵ On the totalization side, the documented Japan Pension Service summary limits coverage to Employees Pension, which matters for residents whose Japan history sits in National Pension only.¹⁵

National Pension-only periods fall outside that totalization side on the published summary (limitation: line-item scope follows the per-country PDF).¹ Korea-Japan readers with mixed 国民年金 (kokumin nenkin, "National Pension") and 厚生年金 (kōsei nenkin, "Employees Pension") histories should confirm their row before counting months.¹⁵

Pair	Posting relief	Totalization boundary	Survivors and disability
UK-Japan	Yes, up to 5 years1	Yes1	Old-age, disability, survivors1
Germany-Japan	Yes1	Yes1	Comprehensive1
Korea-Japan	Yes1	Employees Pension side1	Limited1
Brazil-Japan	Yes1	Yes1	Comprehensive1

The table states each bilateral at article level. Country detail behind any cell is confirmed against the per-country page, not against another row.¹

Brazil-Japan specifics

The Brazil agreement with Japan is comprehensive and reflects the historical Nikkei worker flow between the two states.¹⁶ Both posting relief and totalization apply under the documented scope, which makes it the closest non-European analogue to the United Kingdom and Germany rows.¹⁶

Brazilian nationals with long Japan factory and construction histories use totalization most: Japan months that alone miss vesting can combine with Brazilian periods toward each side's minimum.¹⁶

The shared posting document

Across all four bilaterals, the home-country social security office issues the Certificate of Coverage and the transferee presents it through the Japanese employer.³ The Japan pension office records the exemption only after that filing lands.³

Without the document on file, Japan-side enrollment proceeds by default. The posting is then funding two systems for the gap until the waiver clears, with recovery only through the withdrawal-side rules at departure.³

Confirm the home office and form name for your state

SSA, HMRC, Deutsche Rentenversicherung, and the Korean and Brazilian offices each use their own request channel. A United States form sent to a United Kingdom office buys delay, not coverage.²⁴³

Good to know

A Germany answer is not a Korea answer

Treaty rows are bilateral bargains, not regional policy. Reasoning from the Germany pattern to the Korea case, or from the United Kingdom to Brazil, produces filing errors.¹

Posting relief needs home-office issue before Japan payroll

Retroactive issue is limited under most flows. Payroll set without the certificate accrues Japan contributions first and reconciles later, if at all.³

Survivors and disability scope varies while old-age looks similar

Old-age totalization can exist where survivors or disability cover does not. Read the per-country row for the exact benefit before assuming a deceased or disabled family member is covered.¹

See also

• Non-US Residents in Japan: UK, EU, Australian, and Canadian Tax Rules
• Hiring a Cross-Border Tax Advisor
• Departure Checklist: The 90-Day Run-Up
• Repatriating Pension and Investment Balances at Departure
• Japan Social Security Treaty Countries: The 2026 Map
• US-Japan Totalization Agreement: Rules for US Persons

References

Footnotes

1. Japan Pension Service. Social Security Agreements hub and per-country pages (UK, Germany, Korea, Brazil scope). https://www.nenkin.go.jp/international/english/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶ ↩²⁷ ↩²⁸ ↩²⁹ ↩³⁰

2. UK Government. National Insurance abroad and Japan social security guidance (HMRC issue of coverage documents). https://www.gov.uk/national-insurance-if-you-go-abroad ↩ ↩² ↩³ ↩⁴

3. Japan Pension Service. Certificate of Coverage as the posting document across treaties (home office issues). https://www.nenkin.go.jp/international/english/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

4. Deutsche Rentenversicherung (German Pension Insurance). Postings to Japan and certificate issue notes. https://www.deutsche-rentenversicherung.de/ ↩ ↩² ↩³ ↩⁴

5. National Pension Service of Korea. Korea-Japan agreement notes (Employees Pension scope on totalization side). Cited via JPS hub for scope existence. https://www.nps.or.kr/ ↩ ↩² ↩³

6. Ministry of Health, Labour and Welfare. Brazil-Japan agreement notes (Nikkei worker flow; comprehensive scope). Cited via JPS hub. https://www.mhlw.go.jp/english/policy/social-security/ ↩ ↩² ↩³