Singapore → Vietnam

In plain termsSingapore generally taxes Singapore-earned income; Vietnam residents are taxed worldwide. That mismatch is the overlay. IR21 is an exit gate on the Singapore side.

1. Territorial vs worldwide

   Singapore tax residents are taxed on Singapore-earned income (

   yes

   Source IRAS Working out my tax residency — tax residents taxed on all income earned in Singapore

   Checked Aug 2026 · Band low · Status fresh

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   Method: figures past 2× SLA hide. See /method · /status · /changelog.

   ). Remitted foreign income is generally exempt (
   yes

   Source IRAS Working out my tax residency — tax residents: foreign-sourced income brought into Singapore is tax-exempt (except received through partnerships in Singapore)

   Checked Aug 2026 · Band med · Status fresh

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   Method: figures past 2× SLA hide. See /method · /status · /changelog.

   ). Once Vietnam residence switches on, foreign remote pay can be in scope. Read Vietnam tax residency, then the tax overlay.

2. IR21 on the way out

   IR21 tax clearance exists (

   yes

   Source IRAS Tax Clearance for Foreign & SPR Employees (IR21) — employer files when non-citizen ceases employment / overseas posting / leave >3 months

   Checked Aug 2026 · Band med · Status fresh

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   Method: figures past 2× SLA hide. See /method · /status · /changelog.

   ). Leave-threshold months:
   3 months

   Source IRAS IR21 — leave Singapore for more than three months triggers employer tax-clearance duty (with other triggers)

   Checked Aug 2026 · Band med · Status fresh

   Method: figures past 2× SLA hide. See /method · /status · /changelog.

   . That is not a Vietnam form.

3. CPF follows status

   CPF membership turns on SC / SPR status (

   yes

   Source CPF Board — CPF contributions apply to Singapore Citizens and Singapore Permanent Residents; relocating to Vietnam while remaining SC/SPR does not itself close CPF

   Checked Aug 2026 · Band low · Status fresh

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   Method: figures past 2× SLA hide. See /method · /status · /changelog.

   ), not geography. Mere relocation while still SC does not unlock (
   yes

   Source CPF Board leave pages key closure to loss of SC/SPR status — not to physical relocation alone while remaining a citizen

   Checked Aug 2026 · Band med · Status fresh

   Method: figures past 2× SLA hide. See /method · /status · /changelog.

   ). Singapore–Vietnam social security agreement in force:
   no

   Source Singapore has no bilateral social security / CPF totalisation agreement with Vietnam; CPF membership turns on SC/SPR status (CPF Board), not a VN SSA certificate path

   Checked Aug 2026 · Band med · Status fresh

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   Method: figures past 2× SLA hide. See /method · /status · /changelog.

   .

Also: visa & stay · decide.