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Solomon Islands Corporate Tax Guide: CIT 30% Standard Rate 2026

Solomon Islands Corporate Income Tax (CIT) is set at a standard rate of 30%. There is no reduced rate for small businesses, though a special mining tax regime exists for resource companies. The logging and fishing industries, which dominate the economy, are subject to specific sectoral tax arrangements. Here is how corporate tax works in 2026.

Corporate Income Tax in Solomon Islands is governed by the Income Tax Act and administered by the Inland Revenue Division (IRD). The standard CIT rate of 30% applies to all resident companies and non-resident companies with a permanent establishment in Solomon Islands. The tax year is the calendar year. Companies must file annual CIT returns by March 31 of the following year. Compare this to regional peers: Australia 30% (25% for small business), Fiji 20%, Papua New Guinea 30%, and New Zealand 28%. Filing and compliance guide →

Real-world example: A Honiara-based trading company with annual turnover of SBD 5,000,000 and taxable profit of SBD 800,000 pays CIT at 30% = SBD 240,000. A logging company under the forestry sector tax regime may have different effective rates under the Forestry Act. A mining company with a mining development contract may benefit from a negotiated tax regime. Compare this to Papua New Guinea where CIT is also 30%, and Fiji where the rate is 20%. Cross-border taxation →

Corporate Tax Rate Structure

  • 30% (standard): All resident companies and non-resident companies with a PE in Solomon Islands
  • Mining tax regime: Negotiated rates under the Mines and Minerals Act with specific fiscal stability clauses
  • Logging and forestry: Specific tax arrangements under the Forestry Act including export duties and license fees
  • Insurance companies: Premium-based tax alternative may apply

Solomon Islands does not have a reduced CIT rate for small businesses or micro-enterprises. All companies are subject to the standard 30% rate unless covered by a specific sectoral regime or negotiated investment agreement.

Taxable Income and Deductions

Corporate taxable income is calculated as accounting profit adjusted for tax purposes. Key rules include:

  • Depreciation: Standard rates apply — buildings 5%, machinery 10-20%, vehicles 20%, computers 30%
  • Interest deductibility: Thin capitalization rules may limit interest deductions
  • Loss carryforward: Tax losses can be carried forward for up to 6 years
  • Capital gains: Treated as ordinary income and taxed at standard CIT rate
  • Dividends: Dividends received from resident companies are generally exempt

Transfer pricing rules apply for transactions with related parties. Solomon Islands follows international standards for transfer pricing documentation. Cross-border taxation →

Withholding Taxes on Outbound Payments

Solomon Islands imposes withholding tax on certain payments to non-residents:

  • Dividends: 0% WHT — no withholding tax on dividends to non-residents
  • Interest: 10-15% WHT depending on recipient type
  • Royalties: 10% WHT

WHT rates may be reduced under Solomon Islands' limited Double Taxation Treaties (Australia, New Zealand, UK, and a few others). Investment income guide →

Special Sectoral Regimes

  • Mining: The Mines and Minerals Act provides for negotiated fiscal stability agreements. Mining companies may have customized CIT rates, royalty arrangements, and investment allowances
  • Logging: Forestry companies are subject to export duties, license fees, and specific tax arrangements under the Forestry Act. Logging is a major revenue source
  • Fishing: Fishing license fees and specific tax arrangements for commercial fishing operations, another key economic sector
  • Foreign aid projects: Goods and services provided under foreign aid agreements may have specific tax exemptions

Solomon Islands' economy relies heavily on natural resources (logging, fishing) and foreign aid. Sectoral tax regimes reflect these economic realities.

Who needs to register for CIT in Solomon Islands?

All legal entities (companies, partnerships, branches of foreign entities) must register for CIT with the IRD. Registration is required before starting business operations. Non-resident companies with a permanent establishment in Solomon Islands are also subject to CIT on SI-source income.

What is the filing deadline for corporate tax?

Annual CIT returns must be filed by March 31 of the following year. Tax is paid in quarterly installment payments during the year based on estimated current-year liability, with a final settlement upon filing. Late filing penalties apply.

Are there any regional or provincial taxes?

No. Solomon Islands has a unitary tax system with no regional or provincial corporate taxes. The 30% CIT is the only corporate-level income tax. Provincial governments may impose license fees and service charges but not income taxes.

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