It depends. If the withholding from your W2 matched your tax liability exactly then yes box 17 would be the correct entry. However that is pretty rare due to items mentioned in earlier posts.
Normally there is either a tax owed when the state return is completed and so the taxpayer ultimately paid more than box 17 or there is a refund meaning the taxpayer ultimately paid less than the box 17 amount.
Therefore one must look at the prior year state return to see what the ultimate tax liability paid was.
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