Making an estimated tax payment would be a good idea -- and, the larger the amount of tax you'll owe, the better of an idea it is. The IRS levies underpayment penalties if you don't withhold or pay enough tax on income received during each quarter.
You can use the IRS website to arrange your payments, but TurboTax can also help you do what you need. The 1040ES worksheet is helpful, but using TurboTax can make the process much easier.
See the TurboTax Help articles Do I need to make estimated tax payments to the IRS? and Can TurboTax calculate next year's federal estimated taxes? for more information.
You wouldn't need to notify the IRS of your intention to make payments.
