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To answer that would need a similar sized state/economy to use as the yardstick.
Would Scotland be a contributor or a recipient of EU funding?
Dammit-
Ultimately an Indy Scotland has no choice but to join the EU. So while I don't think it will be the smooth process that many assume, Scotland will just have to do whatever they have to. The UK is now in a weaker economic position outside the EU and that's while being in NATO, having a seat on the Security Council and being exceptionally wealthy. Scotland would have none of those advantages.
Also this narrow use of "higher earners" isn't very useful. It's similar to those vapid presenters who reference higher earners' tax contributions when discussing billionaires. You need lots of people earning a decent chunk >£40k. The government taking half of a tenner over the higher tax rate isn't a tax windfall.
hugo7
And this is sustainable?