Solomon Islands Tax Residency Guide: 183-Day Rule, DTTs 2026
Solomon Islands determines tax residency based primarily on the 183-day physical presence test. Individuals present in Solomon Islands for 183 days or more in a tax year are considered tax residents and taxed on worldwide income. Solomon Islands has a limited network of Double Taxation Treaties (Australia, New Zealand, UK, and a few others). Here is how tax residency works in 2026.
Tax residency in Solomon Islands is governed by the Income Tax Act and determines an individual's or company's obligation to pay tax on worldwide versus Solomon Islands-source income. The rules follow international standards (OECD Model Tax Convention). The IRD is responsible for determining residency status and issuing Certificates of Residency for treaty purposes. Personal income tax →
Real-world example: An Australian expatriate working on a development project spends 200 days in Solomon Islands and 165 days in Australia. Since they exceed the 183-day threshold, they become a Solomon Islands tax resident and are taxable on worldwide income in Solomon Islands. Under the Australia-Solomon Islands DTT, tie-breaker rules (permanent home, center of vital interests, habitual abode) determine which country has primary taxing rights. Filing requirements for residents →
Individual Tax Residency Criteria
- 183-day rule: An individual is resident if present in Solomon Islands for 183 days or more in a tax year
- Permanent home: If an individual has a permanent home available in Solomon Islands, they may be resident even if spending fewer than 183 days
- Habitual abode: Whereabouts and pattern of physical presence are considered
- Ordinary residence: An individual may be treated as resident if they have a regular and habitual mode of life in Solomon Islands
Solomon Islands tax residents are taxed on worldwide income. Non-residents are taxed only on SI-source income. The tax year is the calendar year.
Corporate Tax Residency
- Place of incorporation: A company is resident in Solomon Islands if it is incorporated under Solomon Islands law
- Place of effective management: A company is also resident if its place of effective management is in Solomon Islands, even if incorporated elsewhere
- Permanent establishment: Non-resident companies with a PE in Solomon Islands are taxed on PE-attributable income
Corporate residency determines whether a company is taxed on worldwide income (resident) or only SI-source income (non-resident with PE).
Double Taxation Treaties
Solomon Islands has a limited network of Double Taxation Treaties. Key treaty partners include:
- Australia — comprehensive DTT covering all major income types
- New Zealand — comprehensive DTT
- United Kingdom — limited treaty covering certain income types
- Other — a small number of additional treaties with key trading partners
Treaties generally follow the OECD Model Convention and provide for: reduced withholding tax rates on dividends, interest, and royalties; elimination of double taxation (exemption or credit method); and tie-breaker rules for dual residency. Due to the limited treaty network, non-treaty countries rely on domestic law for cross-border taxation. Cross-border tax guide →
Certificate of Residency
A Certificate of Tax Residency can be obtained from the IRD to prove Solomon Islands tax residency for treaty purposes. The certificate is typically issued for a specific tax year and states that the individual or company is a resident of Solomon Islands for tax purposes. The application requires: tax identification number, proof of physical presence (for individuals), and confirmation of tax filings. Processing time is typically 10-20 business days.
Can I be resident in Solomon Islands and another country?
Yes, dual residency is possible. The applicable DTT's tie-breaker clause determines which country has primary taxing rights. The tie-breaker tests are applied in order: permanent home, center of vital interests, habitual abode, and nationality. The country where you are not treaty-resident may still tax you on local-source income.
What happens if I spend less than 183 days in Solomon Islands?
If you spend fewer than 183 days in Solomon Islands and do not have a permanent home or center of vital interests, you are generally a non-resident. You are taxed only on SI-source income. However, you must still file a tax return for any SI-source income.