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Treaty Lookup Methodology

Compiled by the crossborderfreelance.com editorial team. Reference data last reviewed 2 August 2026. We do not provide individual tax, legal, or financial advice — see disclaimer below.

Informational only — not tax or legal advice

The output is a reference card showing whether the two selected countries have a tax treaty in force, when it was signed, and where to read the source treaty document. It does NOT interpret the treaty, apply tie-breaker rules, calculate withholding for you, or tell you that a particular treaty article applies to your situation. Treaty interpretation is highly fact-specific. Consult an international tax specialist for your situation.

Data last verified 2 Aug 2026 — methodology

TL;DR

We source treaty data exclusively from the OECD treaty database and official country revenue authority websites. We never use third-party blogs. Every withholding rate is published with its conditions. We do NOT interpret treaties or calculate your actual tax obligations.

What the tool does

  • Surfaces structured treaty data: status, dates, taxes covered, withholding rates with conditions
  • Links to official treaty PDFs where publicly hosted
  • Cites source URLs (OECD or country revenue authority)
  • Flags data as 'seed' (unverified) or 'verified' (cross-checked)

What the tool does NOT do

  • Interpret treaty articles for your situation
  • Apply tie-breaker rules when two countries claim you as a tax resident
  • Calculate your actual withholding rate for a specific transaction
  • Claim you are "covered" by a treaty
  • Recommend a payment structure or entity type

All of the above require treaty interpretation — which is highly fact-specific. Consult an international tax specialist for your situation.

Data sources

OECD Double Taxation Convention Database

The primary source for treaty status, signing dates, entered-in-force dates, and treaty text links. The OECD maintains the most comprehensive public database of bilateral tax treaties.

Source: https://www.oecd.org/tax/treaties/

Country Revenue Authorities

Where the OECD database lacks detail (e.g., specific withholding rate conditions), we supplement with data from official country revenue authority websites (IRS for the US, HMRC for the UK, ATO for Australia, etc.).

Examples: IRS International Tax Treaties, HMCTS Treaties

We do NOT use

Third-party tax blogs, personal websites, or non-authoritative sources. If a source is not an official government publication or OECD database, it is not used.

How withholding rates are presented

Every withholding rate on this site is paired with:

  • Rate: The percentage published in the treaty text
  • Condition: The specific circumstances under which this rate applies (e.g., "if recipient holds ≥10% of voting shares")
  • Source Article: The treaty article reference (e.g., "Article 10 — Dividends")

⚠️ We never present a withholding rate as a bare number without its condition. A rate without conditions is meaningless — it could apply or not depending on your specific facts.

Data verification process

Seed All treaty records begin as dataStatus: 'seed'. They are structurally complete (all required fields populated) but have not been manually verified against primary sources.
Verified When a record is manually cross-checked against OECD publications and/or country authority websites, dataStatus is updated to 'verified' and lastVerified is set to today's date.
Priority Verification priority: (1) Estonia pairs (EE-X combinations) — benchmark dataset, (2) US-X pairs — highest search volume, (3) EU-pair grid — foundational pairs.

Need treaty interpretation for your situation?

The tool shows treaty structure and published rates — but whether a treaty applies to your situation, which articles govern, and what your actual withholding rate is, requires specialist analysis.

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