E-E-A-T TECHNICAL METHODOLOGY 2026 Effective: January 2026

Calculation Methodology, Formulas & Data Sources

VSK-IS operates with complete algorithmic and legal transparency. This document details the exact mathematical formulas, statutory frameworks, and public data sources that power all calculators on this portal.

Statutory Basis: All calculation modules are directly audited against Icelandic Value Added Tax Act No. 50/1988, Customs Act No. 88/2005, Income Tax Act No. 90/2003, and Central Bank of Iceland currency benchmark indices.

1 Value Added Tax: Mathematical Formulas (24% Standard & 11% Reduced)

Iceland applies two statutory VAT brackets pursuant to Article 8 of Act No. 50/1988: the 24% standard rate (applied to most commercial products and services) and the 11% reduced rate (applied to foodstuffs, hotels, books, and public transport).

A. Forward VAT Calculation (Net → Gross Total)

VAT Amount (24%) = Net Base × 0.24
Gross Total = Net Base × 1.24

Example: If taxable services are invoiced at 10,000 ISK net, 2,400 ISK output VAT is added, totaling 12,400 ISK gross.

B. Backward VAT Extraction (Gross Total → Net Base & VAT)

Net Base = Gross Total / 1.24
Included VAT = Gross Total × (24 / 124) ≈ 19.3548%

For 11% items: Gross × (11 / 111) ≈ 9.9099%. Example: A retail price of 10,000 ISK includes 1,935 ISK VAT and a net base of 8,065 ISK.

2 Customs Valuation (CIF) & Import Duties (Customs Act No. 88/2005)

In accordance with Article 14 of Customs Act No. 88/2005, Iceland assesses import tariffs on the CIF basis (Cost, Insurance, and Freight). Customs duties and VAT are never levied solely on retail purchase value:

Statutory Calculation Sequence:
  1. CIF Value in ISK: (Product Cost in Foreign Currency + Shipping) × Central Bank Customs Rate
  2. Customs Duty: CIF Value × Statutory Tariff Rate (0% to 20%)
  3. VAT Assessment Base: CIF Value + Customs Duty + applicable excise taxes
  4. Value Added Tax (24%): VAT Base × 0.24
  5. Total Landed Cost: CIF Value + Duty + VAT + Courier Customs Clearance Fee

3 Official Data Sources & Audit Schedule

🏛️ Skatturinn (Iceland Revenue & Customs)

Official Icelandic Customs Tariff (HS codes), VAT guidelines, and employer payroll tax thresholds. Re-audited immediately upon regulatory updates.

📈 Central Bank of Iceland (Seðlabanki Íslands)

Official monthly customs exchange rates and live interbank exchange rates updated every business day at 16:15 GMT.

⚖️ Alþingi (The Parliament of Iceland)

Primary statutes: Acts No. 50/1988, 88/2005, 90/2003, and the annual parliamentary state budget (Fjárlög).