As a counter to Gemini
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As a reply, it's partly persuasive but overstated. The main weakness is the last sentence:
"Those countries have made an exit tax work."
That goes beyond what the preceding evidence shows.
The list demonstrates that many countries have enacted some form of exit tax, but it does not demonstrate that those taxes have been successful or "work" in the sense of achieving their policy objectives.
A good critique would be:
Your examples show that a number of countries have introduced some form of exit tax. They don't show that those taxes have been successful, raised the expected revenue, reduced tax avoidance, or avoided unintended consequences such as capital flight or discouraging investment. Adoption is evidence that a policy exists, not that it works well.
You could also point out that the examples are not directly comparable:
Many only apply to specific assets (e.g. shares).
Several have high thresholds (Japan, Norway, France).
Germany's rules primarily target people with substantial shareholdings, not ordinary investors.
Australia's and Canada's systems contain important exemptions and deferral mechanisms.
The scope and purpose vary considerably between countries.
So grouping them together as if they all have the same broad exit tax is misleading.
The strongest criticism is the leap from "exists" to "works." To justify that conclusion, you would need evidence such as:
revenue raised;
compliance rates;
impact on emigration or investment;
evidence that avoidance was reduced;
economic costs versus benefits.
Without that evidence, "many countries have an exit tax" is a factual observation, but "they have made it work" is an unsupported conclusion.
A concise response could be:
That shows these countries have adopted some form of exit tax; it doesn't show they've made it work. To support that claim you'd need evidence that the tax has met its objectives without causing disproportionate economic costs. Existence isn't the same as success.
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Copilot:
As an argument, it's fairly strong because it uses multiple concrete examples and demonstrates that exit taxes are not merely theoretical. However, I think there are some weaknesses in both accuracy and robustness.
Strengths
Correctly identifies that many countries have exit-tax style regimes
Canada's departure tax is real.
Australia's deemed disposal rules are real.
Several European countries do impose exit taxes on individuals in certain circumstances.
Japan has a departure tax on certain high-net-worth residents.
Provides specific thresholds and conditions
Mentioning Germany's 1% shareholding rule.
Mentioning France's asset thresholds.
Mentioning Japan's ¥100 million threshold.
This makes the argument appear evidence-based rather than merely rhetorical.
Accuracy concerns
- "Most of the EU" is overstated
The statement:
"Under the EU's ATAD, member states must enforce exit taxes on unrealized capital gains."
is potentially misleading.
ATAD primarily requires exit-tax provisions for companies, not a uniform individual exit tax applying to ordinary citizens. While many EU countries do have individual exit-tax regimes, they vary enormously in scope, thresholds, assets covered, payment deferrals, and applicability.
A critic could fairly say the argument conflates:
corporate exit taxes,
individual exit taxes,
and shareholding-specific regimes.
- Austria is presented too broadly
The claim:
"Austria has a very broad exit tax with no minimum asset threshold"
needs qualification.
The scope of assets, reliefs, and treaty interactions matter. Saying it applies whenever residency is lost risks overstating how comprehensive it is.
- Germany and France are niche examples
Germany and France actually strengthen a counterargument:
Germany primarily targets substantial shareholdings.
France targets substantial wealth holdings.
These examples show that many exit-tax systems are aimed at wealthier taxpayers rather than everyone.
A sceptic could therefore argue:
"Your own examples demonstrate that most countries do not tax every emigrant. They target specific classes of assets or wealthy individuals."
Missing UK comparison
The biggest weakness is that the argument jumps from:
"These countries made exit taxes work"
to
"Why isn't the UK doing it?"
without addressing that the UK has a different anti-avoidance model.
A robust argument should acknowledge:
"The UK does not generally impose a deemed-disposal exit tax but instead relies on temporary non-residence rules and taxation of UK-situs assets."
Without that acknowledgement, critics can dismiss the argument as comparing unlike systems.
Logical weakness
The statement:
"Those countries have made an exit tax work."
is asserted rather than demonstrated.
To prove an exit tax "works" you would need evidence that it:
raises meaningful revenue,
reduces tax-motivated emigration,
survives legal challenge,
is administratively practical,
does not cause excessive capital flight.
The examples only establish that:
"Other countries have implemented exit taxes."
That is weaker than proving they are successful.
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I personally think Norway is probably the best example to look at if you want to understand what the impact of introducing a wealth tax on individuals in the ways you are suggesting. The jury is still out on that one. Some wealthy people and capital have left Norway, but it's too early to know the long term impact.
It's not just wealth leaving that matters. It's also about keeping and attracting entrepreneurs. They don't just pay tax. They build businesses, create jobs and generate future tax revenues. Fewer businesses is likely to mean less of all of those things.
If we're going to tax excessive wealth, it will take far more creativity, skill and precision than a snake oil salesman wielding a sledgehammer while peddling the latest edition of the politics of envy to his acolytes.