When you file your US tax return (if you are a Nonresident Alien, you can NOT use TurboTax), that will determine your actual taxes. You could get some or all of the $489 refunded, or you may owe more taxes.
If you ALSO owe taxes on that money to the Czech Republic, you may be able to get a "Foreign Tax Credit" that would reduce or eliminate any taxes owed on that money.
At any rate, you will need to file a US tax return. If you are a Nonresident Alien or a Dual Status Alien, TurboTax does not do those types of tax returns, and I highly recommend going to a tax professional.
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