Staff of International Organisations
The tax situation of UN personnel and staff of other international organisations sits at the intersection of international law, German income tax law and double taxation treaties. Every case is individual — and must be treated as such.
What is tax-exempt for UN staff is subject to the full German income tax liability for GIZ staff. What was tax-exempt in the country of origin may become a declarable item after relocation. We assess first — and advise concretely only then.
Bonn — UN Campus
UN institutions are based at the Bonn UN Campus — including UNFCCC (~450 staff), UN Volunteers (~300) and UNCCD. According to the German Federal Foreign Office, close to 1,000 employees work there in total. As a Bonn-based firm, we have long-standing practical experience with the specific tax characteristics of this client group.
01 — Tax Exemption
Who is exempt from German income tax — and who is not?
The tax exemption on the salaries and emoluments of UN staff derives not from German income tax legislation but from international law: Art. V Section 18(b) of the Convention on the Privileges and Immunities of the United Nations of 13 February 1946 (General Convention) exempts UN staff members from national income tax on their emoluments. Germany ratified the Convention by Act of 16 August 1980 (BGBl. II S. 941). For the Bonn-based UN organisations, the respective Headquarters Agreements (HCAs) apply in addition: UNV (BGBl. 1996 II S. 903), UNFCCC (BGBl. 1997 II S. 1054) and UNCCD (Agreement BGBl. 1998 II S. 2695; Implementing Act BGBl. 1999 II S. 218, BT-Drs. 14/228).
§ 3 No. 29 EStG — a common misconception: This provision applies exclusively to diplomats and career consular officers of foreign states, not to staff of international organisations. The exemption for IO personnel derives exclusively from the relevant specialised international agreements. Whether tax privileges continue to apply after a lengthy period of residence in Germany depends on the specific organisational legal status, the applicable legal basis and the individual’s personal circumstances. The concept of “permanent residency” (ständige Ansässigkeit) is not a fixed time threshold but involves an overall assessment (Cologne Tax Court, 12 K 7040/98 of 24 January 2001).
For GIZ (Gesellschaft für Internationale Zusammenarbeit GmbH), the exemption provisions do not apply: as a federal GmbH under German law, it holds no status under international law and has not concluded an exemption agreement with Germany. GIZ staff are subject to the regular German income tax and, as a general rule, to mandatory social security contributions.
All categories at a glance
Who is affected and how — six categories at a glance
| Category | Income Tax on Emoluments | Progression Clause | Social Security | Value Added Tax (VAT) | Health Insurance on Return | DTT Relevance |
|---|---|---|---|---|---|---|
| UN OfficialArt. V Sec. 17–18 UN Convention | Tax-exempt under Art. V Sec. 18(b) and HCA — individual assessment after lengthy residence | Generally not applicable — international law basis for exemption; classification to be verified according to the applicable exemption ground | UNJSPF instead of GRV — exemption from German mandatory contributions possible; special assessment required | Individual assessment required | GKV § 9 SGB V: 3-month deadline on return; otherwise PKV — UNHIC/CIGNA ends with active service | Privilege regime takes precedence; DTT applies subsidiarily to other income |
| Expert on Mission / ConsultantArt. VI Sec. 22 UN Convention | No automatic exemption — § 18 EStG; status and contractual basis must be assessed separately | Relevant — taxable fee income is subject to the regular progressive rate | IO-specific rules may apply — check separately; no automatic UNJSPF enrolment | Individual assessment (§ 3a UStG: place of supply, entrepreneur status of recipient, nature of supply) | Same as self-employed persons — GKV/PKV; no IO system coverage as standard | Art. 15 OECD-MC may apply; check privilege regime first |
| National Professional Officer (NPO)UN principal organs — 1946 General Convention, Art. V Sec. 17–18 | Tax-exempt as UN Official — NPOs at UNFCCC, UNV, UNCCD are Officials within the meaning of Section 17; German nationals also covered | Generally not applicable — same exemption basis as UN Official; individual assessment | UNJSPF or comparable IO system — exemption from German GRV possible; check | Not relevant (employee) | GKV § 9 SGB V: 3-month deadline on return; check IO health insurance | Privilege regime takes precedence; DTT applies subsidiarily |
| General Service / Local StaffNot Professional Officer status; possibly Specialized Agencies (1947 Convention) | Individual assessment — dependent on classification, Convention (1946 vs. 1947) and HCA | Individual assessment based on income tax treatment | Dependent on IO status and contract type | Not relevant (employee) | GKV/PKV depending on specific status | Art. 15 OECD-MC; check privilege regime first |
| GIZ StaffFederal GmbH, no status under international law | Regular German income tax — check Foreign Activities Decree (ATE) for states without DTT (since tax year 2023: actual taxation required) | Relevant | German mandatory social security as general rule; for secondments check A1 certificate and bilateral agreements | Not relevant (employee) | GKV/PKV; for overseas secondments clarify insurance position in the country of activity | Art. 15 OECD-MC; ATE where no DTT exists |
| UNJSPF Pension RecipientFormer UN Official in retirement | UNJSPF pension taxable — § 22 No. 1 s. 3 lit. a(aa) EStG; taxable proportion per cohort model (Federal Fiscal Court, BFH X R 50/14) | May be relevant for income received alongside the pension | Check voluntary GRV contributions; UNJSPF pension ≠ GRV pension; no automatic GRV entitlement from UNJSPF membership | Not relevant | UNHIC/CIGNA typically ends with active service; GKV § 9 SGB V: observe 3-month deadline — otherwise PKV | Art. 18 OECD-MC (pensions) may apply — individual assessment |
● Generally favourable / tax-exempt · ● Tax liability / requirement · ● Individual assessment required · All information is provided for orientation purposes only and does not substitute for individual tax advice.
02 — UN Consultants
Experts on Mission — two tax pitfalls for freelancers
1. Income tax: The tax exemption under Art. V Section 18(b) of the General Convention applies exclusively to staff members classified as “officials” within the meaning of Section 17. Consultants and Experts on Mission fall under Art. VI Section 22 of the Convention — which provides for functional privileges but no general income tax exemption. Fee income in Germany is typically subject to regular income tax as income from self-employment (§ 18 EStG).
2. VAT — a frequently overlooked risk: International organisations are generally not regarded as entrepreneurs (Unternehmer) for VAT purposes within the meaning of § 2 UStG (German VAT Act) when acting in a sovereign capacity — with the consequence that the B2B place-of-supply rule under § 3a(2) UStG often does not apply. Instead, § 3a(1) UStG may apply: the place of supply is then the registered office of the supplying consultant — i.e. Germany. Incorrectly worded invoices can lead to additional assessments including interest charges.
Standard procedure for services rendered to IOs based in Germany (UNFCCC, UNV, UNCCD):
- KWS / adviser issues invoice with VAT — the supplying entrepreneur remains the tax debtor.
- The IO submits a refund application to the Federal Central Tax Office (BZSt) under the VAT Refund Regulation (UStErstV, BGBl. 1988 I S. 1780) in conjunction with the exemption clauses of the applicable Headquarters Agreement (UNFCCC Art. 5, UNCCD Art. 5 etc.).
- Direct zero-rate invoicing is not possible — § 4 No. 7 UStG applies exclusively to IOs based in other EU Member States, not to IOs based in Germany such as UNFCCC, UNV or UNCCD.
We clarify the correct VAT treatment — place of supply, tax liability, invoice structure — before invoices are issued to international organisations.
- Income tax: status must be assessed separatelyConsultants and Experts on Mission are not automatically Officials (Art. V vs. Art. VI UN Convention) — exemption only after individual assessment
- VAT: check place of supply, recipient status, nature of supply§ 3a UStG: place of supply depends on the VAT classification of the IO as the recipient of the supply — no schematic assessment possible
- Reverse charge and exemptions — individual case§ 13b UStG and possible exemption provisions must be assessed on a case-by-case basis; blanket statements on the entrepreneur status of IOs are not reliable
- Invoice structure must be correctIncorrectly worded invoices without the correct VAT disclosure can lead to additional assessments, late-payment interest and penalties
- VAT refund procedure (UStErstV)IOs may claim a refund of VAT paid via the VAT Refund Regulation (UStErstV) from the Federal Central Tax Office (BZSt) — this does not relieve the consultant of the obligation to verify correct invoicing
- Trade tax for commercial activitiesFor technical services or activities of a commercial character: assess the distinction between § 15 EStG and § 18 EStG and any trade tax liability
03 — Tax Liability & Foreign Assignment
German Tax Liability During Foreign Assignment
Those who retain their residence in Germany — even during a multi-year posting abroad — remain subject to unlimited German income tax liability (§ 1(1) EStG in conjunction with §§ 8 and 9 AO). Germany taxes worldwide income.
Dual residence — a classic Bonn scenario: The family remains in the house in Bonn or the Rhine-Sieg region while the UN staff member rotates to Geneva, New York or Nairobi. In this case, residences exist in two states simultaneously. For emoluments from international organisations, the primary question is whether the applicable privilege regime or Headquarters Agreement independently governs the taxation. Only alongside this does the tie-breaker rule of the applicable DTT (Art. 4(2) OECD-MC) determine residence for treaty purposes — the decisive factor being the “centre of vital interests”.
If you hold a shareholding in a corporation (at ≥ 1 % at any point within the preceding 5 years), relocation of residence abroad requires an assessment of exit tax under § 6 AStG. The ATAD Implementation Act of 25 June 2021 fundamentally tightened the provisions. The JStG 2024 (BGBl. 2024 I No. 387, 2 December 2024) extended the scope from 1 January 2025 to include holdings in (special) investment funds (> 1 % or acquisition cost ≥ EUR 500,000 per fund). The return exemption under § 6(3) AStG: those who leave with the intention to return and do so within seven years may have the exit tax extinguished retroactively.
- Dual Residence & Tie-BreakerFamily in Bonn, duty station abroad → Art. 4(2) OECD-MC: centre of vital interests determines the primary taxing right
- Retain or relinquish German residence?Tax consequences of residence planning — exemption vs. credit method depending on the applicable DTT
- Identify the applicable DTTWhich treaty governs the relationship between Germany and the country of activity — and which taxing right belongs to which state?
- No DTT: § 34c EStGAvoidance of actual double taxation through credit of foreign tax against German income tax
- § 6 AStG — Exit Tax (shareholdings ≥ 1 % + investment funds from 2025)Immediate assessment on unrealised gains; 7-year instalment option on request; return exemption: tax extinguished retroactively. JStG 2024 (BGBl. 2024 I No. 387): scope extended to (special) investment funds (> 1 % or acquisition cost ≥ EUR 500,000 per fund) from 1 January 2025.
- “Permanent Residency” (ständige Ansässigkeit) — may become relevant after lengthy residenceThe decisive factors are status, legal basis and actual personal circumstances; no fixed time threshold. The Foreign Office administrative benchmark (approx. 10 years) is not a legal norm (Cologne Tax Court, 12 K 7040/98)
04 — Social Security & Retirement Provision
UNJSPF, German Statutory Pension Insurance and Retirement Planning
UN staff are largely exempt from the German social security system and instead participate in the United Nations Joint Staff Pension Fund (UNJSPF). The contribution rate is 7.9 % (employee) and 15.8 % (employer — i.e. the UN organisation) of the “pensionable remuneration”.
UNJSPF retirement pension and taxation: Per Federal Fiscal Court (BFH) judgment X R 50/14 of 5 April 2017, UNJSPF retirement pensions are subject to deferred income taxation under § 22 No. 1 s. 3 lit. a(aa) EStG — regardless of the fact that emoluments were tax-exempt during the active period. The taxable proportion is determined by the year in which pension payments commence (cohort model).
Lump-Sum Commutation vs. annuity pension: The tax treatment of lump-sum payments from the UNJSPF is not conclusively settled by BFH case law or BMF guidance. Per BFH X R 28/23 and X R 25/23 (30 October 2025, occupational pension line), it must be assumed that the One-Fifth Rule (§ 34 EStG) does not apply where the option to commute to a lump sum — as under the UNJSPF (Art. 28(g)) — was already incorporated in the original pension arrangements. [S3 — individual advice recommended; no direct BFH ruling on UNJSPF] For large capital amounts, a binding advance ruling under § 89(2) AO is additionally recommended. We advise you before the decision — not after.
Key Questions — Active Staff & Pensioners
- Is mandatory German social security membership required — or is an exemption applicable due to UNJSPF membership?
- Is voluntary German statutory pension insurance (GRV) contribution worthwhile despite UNJSPF membership — and from what point does it become financially beneficial?
- What is the taxable proportion of the UNJSPF pension — and which cohort taxable proportion applies from which year of pension commencement?
- Are the employee’s own contribution shares taken into account as a tax-reducing factor under the cohort model?
- Lump-Sum Commutation or annuity? Tax consequences of the choice between a Lump-Sum Commutation and an annuity pension — check applicability of the One-Fifth Rule (§ 34 EStG)
05 — Health Insurance
Health Insurance on Return — an underestimated risk
UN staff are covered during their active service by IO-operated health insurance schemes — for example through UNHIC (UN Health Insurance Committee / CIGNA). On returning to Germany, a coverage gap arises that is frequently underestimated.
Those returning to Germany after a lengthy period abroad who wish to join the statutory health insurance scheme must satisfy the conditions for voluntary membership of the GKV (§ 9 SGB V, Social Code Book V). The right to join exists within three months of the end of the foreign insurance cover. If this deadline is missed, private health insurance (PKV) is generally the only remaining option — with considerably higher premiums for older returnees.
- GKV entry right — observe the 3-month deadlineAfter the end of foreign insurance cover, a time-limited right to voluntary GKV membership exists (§ 9 SGB V) — missing the deadline generally results in private health insurance (PKV)
- Private health insurance (PKV) as the alternativeIf the annual earnings threshold is exceeded or after the deadline has passed: private health insurance — premiums are age-dependent and substantial in retirement
- Check family coverage eligibilityCo-insurance of spouse and children under the GKV (§ 10 SGB V) only within income limits — after a long absence, prior insurance periods must be checked
- IO health insurance schemes and pension receiptUNHIC/CIGNA schemes generally cover only active staff — no automatic continuation in retirement; coordination with UNJSPF pension required
- IO cost-reimbursement schemesSome organisations provide a residual cost reimbursement to retired staff — clarify the distinction from German GKV/PKV and the tax treatment of such reimbursements
06 — Relocating to Germany
Tax matters to address on relocation to Germany
On relocating to Germany from abroad, tax action points arise that need to be addressed promptly. We manage the process from the date of relocation — including correspondence with the competent Tax Office and coordination with the country of origin through our partner network.
- Commencement of German tax liabilityFrom which date does unlimited income tax liability begin — and which income is covered from that point?
- Prior-year income from abroadHow is income earned in the country of origin treated in the year of relocation — exemption or credit?
- Tax exemption from the date of relocationDoes an exemption apply based on organisational status — from exactly when, and how is it claimed before the Tax Office?
- First German income tax returnWhich forms, schedules, documents and supporting evidence are required?
- Residual obligations in the country of departureAre there outstanding tax declaration or payment obligations there — and how are these coordinated with the German side?
- Tax identification number and jurisdiction of the competent Tax OfficeRegistration with the competent Tax Office, including clarification of local jurisdiction for Bonn-based UN organisations
07 — Our Services
What We Handle for You
Specialist tax advisory for UN personnel, IO staff and expatriates at the Bonn location — nationwide.
Frequently Asked Questions
Questions for Our Tax Advisers
Answers to the questions our clients in the context of international organisations ask most frequently — precise and with the level of legal detail the subject demands.
As a general rule yes — for staff members falling under Art. V Section 18(b) of the 1946 UN General Convention. The exemption does not apply automatically to all contract types. The decisive factors are the specific status (Official vs. Consultant), the applicable Headquarters Agreement and the individual employment relationship.
Not covered are Consultants and Experts on Mission (Art. VI Section 22), General Service Staff without Professional Officer status, and staff of federal GmbHs such as GIZ.
No. Unlike DTT-exempt income, emoluments exempt under international law (UN General Convention, Headquarters Agreements) are not subject to the progression clause (Progressionsvorbehalt) of § 32b EStG. They do not increase the tax rate on other income.
Yes. Per Federal Fiscal Court (BFH) judgment X R 50/14 of 5 April 2017, UNJSPF retirement pensions are subject to income taxation under § 22 No. 1 s. 3 lit. a(aa) EStG — regardless of the fact that emoluments were tax-exempt during the active period.
The taxable proportion is determined by the year in which pension payments commence (cohort model). Pensioners entering retirement from 2040 onwards will have 100 % of their pension subject to income tax.
Since UN emoluments are not subject to the progression clause, they are not included in the splitting base for joint assessment (§ 26b EStG). A UN staff member with a tax-exempt salary and a spouse who is fully subject to German income tax are treated as if the UN staff member earned no income — the taxable spouse begins the progressive tax scale from the basic personal allowance.
UN Consultants (Experts on Mission) are not Officials within the meaning of Art. V Section 17 of the 1946 General Convention — they fall under Art. VI Section 22. No automatic income tax exemption applies; fee income is typically subject to German income tax as income from self-employment (§ 18 EStG).
Additionally, a VAT risk exists: international organisations are frequently not regarded as entrepreneurs (Unternehmer) within the meaning of § 2 UStG when acting in a sovereign capacity — with the consequence that the B2B place-of-supply rule under § 3a(2) UStG does not apply and VAT may be chargeable in Germany.
The concept of “permanent residency” (ständige Ansässigkeit) is not a fixed time threshold but involves an overall assessment. The administrative practice (German Federal Foreign Office circular of 15 September 2015) uses approximately ten years as a benchmark, but case law (Cologne Tax Court, 12 K 7040/98 of 24 January 2001) shows that even shorter periods with sufficient integration of personal life into Germany can constitute permanent residency.
UN staff are covered during their active service by IO-operated health insurance schemes (e.g. UNHIC/CIGNA). On returning to Germany, the right to voluntary GKV membership (§ 9 SGB V) exists only within three months of the end of the foreign insurance cover. If this deadline is missed, private health insurance (PKV) is generally the only remaining option.
For spouses and children, separate entry deadlines and family coverage eligibility checks under § 10 SGB V apply. This matter should be addressed no later than six months before a planned return.
KWS International Steuerberatungsgesellschaft mbH in Bonn specialises in international tax law and advises UN staff, IO employees and expatriates at the UN location Bonn. The firm is based directly in Bonn and is thoroughly familiar with the specific tax characteristics of the Bonn-based UN organisations (UNFCCC, UNV, UNCCD and others).
Have further questions about your specific situation? We assess your situation and tell you in advance whether and how we can specifically help you.
Request Initial ConsultationYour Point of Contact for International Tax Law & UN Mandates
Advisory by Recognised Expertise
International Tax Law · UN Mandates · Bonn
Martin Blesgen
Dipl.-Volkswirt · LL.M. (International Tax Law, WU Vienna) · Tax Adviser Managing Director, KWS International Steuerberatungsgesellschaft mbH
Publications- Editor: “Transfer Pricing in Germany”, Otto Schmidt Publishers, Cologne
- Author: German VAT Chapter, EU VAT Compass, IBFD Amsterdam
- Contribution to European Taxation, IBFD Amsterdam
- “Permanent Establishments of Insurance Companies”, in: “Permanent Establishments in International Tax Law”, Linde Publisher, Vienna
Initial Contact
We tell you in advance whether and how we can specifically help you.
No generic initial consultation. We assess your situation and give you an honest first assessment — before any engagement is entered into.
Note: This page provides general information only and does not constitute individual tax advice. Tax regulations are subject to change; the applicable law depends on the specific facts and circumstances of each case. The tax treatment of emoluments from international organisations depends on individual status, the applicable legal basis and personal circumstances. Binding conclusions regarding your own tax situation always require individual professional advice. KWS International Steuerberatungsgesellschaft mbH, Kaufmannstraße 52, 53115 Bonn.