Suspended tax treaties: what happens when a treaty stops working

Double tax treaties are agreements between states and can be suspended, denounced or renegotiated by them. When that happens, arrangements built on the treaty stop working, and the change usually takes effect from a stated date rather than prospectively from when you find out.

What suspension actually removes

• Reduced withholding rates on dividends, interest and royalties, which revert to domestic rates — frequently several times higher.
• Allocation rules that assigned income to one country, so both may now tax it.
• The residence tie-breaker, which is the provision that resolves dual residence. Without it, two countries can each treat you as resident with no mechanism to decide.
• Relief mechanisms, though unilateral domestic credit relief usually survives in some form and is the fallback.

Who is affected and how quickly

• Anyone receiving cross-border investment income between the two states, immediately at the next payment date.
• Anyone relying on the tie-breaker to establish a single residence, which is the most serious effect and the least visible.
• Companies, where a permanent establishment article or a management-and-control test was doing structural work.

What to do when it happens

• Establish the effective date, which may precede the announcement, and identify which payments fall either side of it.
• Check domestic unilateral relief in your country of residence. Most systems credit foreign tax paid even without a treaty, at some level.
• Re-examine residence. Without a tie-breaker, the facts have to do the work the treaty was doing — days, home, family, economic centre — and ambiguity that was tolerable becomes expensive.
• Review holding structures whose viability depended on treaty rates.

The planning lesson

A treaty is not a property of your arrangement; it is a bilateral relationship that can change for reasons having nothing to do with you. Structures whose economics depend entirely on a single treaty are structures with a political dependency, and the sensible position is to know which treaty each part of your position relies on and what the fallback is without it.