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I would like to use my 2017 tax return and estimate my 2018 taxes.
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You would have to manually enter the 2017 tax data to get estimated taxes owed or estimated tax refund for 2018 using the calculator TaxCaster - https://turbotax.intuit.com/tax-tools/calculators/taxcaster/
If you were using the TurboTax desktop editions then use the What-If worksheet in Forms mode. The What-If worksheet uses the tax data from the 2017 tax return and the 2018 tax code for estimates.
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