You don't need to ratify a treaty through reconciliation. There's no need for this to be done with a formal treaty. It could simply be each of the nations passing laws that do the same thing.

If the Senate passes a law that changes the corporate tax rate to a certain amount, that is a budgetary measure that could absolutely be passed with reconciliation.

Yes, this law wouldn't be a treaty, but it could have a similar effect.

> If the Senate passes a law that changes the corporate tax rate to a certain amount, that is a budgetary measure that could absolutely be passed with reconciliation.

If it was revenue-neutral, sure. That is unlikely to be the case with changes to corporate tax rates. And even then, you are going to have a hard time getting even 50 votes.

> If it was revenue-neutral, sure.

No, revenue-neutrality doesn't weigh in favor of being eligible for reconciliation; a measure must principally address either spending, revenue, or the debt limit to be eligible for that process.

That’s an incorrect description of the budget reconciliation process.

One of the budget reconciliation categories is explicitly for revenue, which means being revenue-neutral would make it harder to pass under reconciliation.

Being an aspect that explicitly impacts revenue makes it much easier to pass under the revenue reconciliation process. In fact, adjusting those rates would be a pretty straight-down-the-middle use of reconciliation.

https://en.m.wikipedia.org/wiki/Reconciliation_(United_State...

> You are not going to ratify a treaty with the required 2/3 votes in the Senate via reconciliation

Which is among the reasons this won’t technically be a treaty in US law (even if it is in international law), but a Congressional-executive agreement [0].

[0] https://legal-dictionary.thefreedictionary.com/Congressional...