Go through the 'Other Tax Situations' section your TurboTax return to complete your 2018 estimated taxes or use TurboTax's Taxcaster tool to complete your estimated taxes. Both will take into account your total income (wages and self-employment), filing status, dependents and other expected events for the 2018 tax year.
Depending on how much self-employment income your wife has, you could also adjust your W-4 withholding to spread some of that tax payment more widely than quarterly.
TurboTax TaxCaster
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