With apologies for a long reply, but a useful answer has to address a few problem's you didn't mention.

First, to your query: The tax estimate is probably "very close." From 2006 on, your federal tax rate is calculated as if there were no "foreign earned income exclusion", i.e. in your situation a 25% tax rate on the income above the exclusion amount.

So, you'd owe (approximately) US $10K less a credit for CH taxes paid on the "top portion", i.e. on the amount above US $91,400 for 2009. (You do not get a tax credit for all CH taxes if you also claim the earned income exclusion.)

This assumes, of course, that at least $91k or your income qualifies under the "earned income" definition.

Honestly, there is no way to be sure unless you sit down with the tax forms, and ruin a weekend by figuring them out (which you certainly can do for yourself, if your blood pressure can handle the aggravation).

The real problems are these:

First, the IRS amnesty has passed, and if you file prior years' tax returns now, you will face a 25% penalty for late filing, plus interest (avg 8% per year). So, this can get expensive rather quickly.

Secondly, you will face the $10k per year penalty for not filing the FBAR. (I assume you didn't, since the IRS hasn't matched the FBAR against the non-filed tax returns, and written to inquire.)

Further, if you (a) suddenly start filing returns, and are over 25 years of age, or (b) you renounce your US citizenship, which is reported now to the IRS, then they are quite likely to realize you haven't been filing for a very long time, and will send you a cordial letter. Or two.

Net: Unless there is some urgency, you may wish to wait for another "amnesty" program.

IMVHO, no. From your post, there is nothing overly complicated about your tax returns, you need merely look for a CPA who is familiar with the "foreign earned income exclusion" and with the forms for foreign tax credits (in short: find a CPA with many US expats as clients).

There is an American CPA in Zurich who would have exactly the right experience to help you: Steven E. Kraft (he's in the 'phone book).

TurboTax is very useful, but honestly you clearly can understand the forms etc yourself, and I would not trust TurboTax for non-resident returns and the tax credit (too unusual for their clientele).