What date would I use as start date for S-corp if we haven't conducted any business yet? We are still building an eCommerce website that has not bought or sold anything.

[cmam23]

We incorporated in 2017 to begin building the website for future sales, but have not publicly launched the site yet for business.  So I am not sure what to put for the start date if it is a future date.

[ToddL]

Your "start date" can be either the date you incorporated or the date when you first report either income or expenses on your tax return (Form 1120-S). 

You are not required to file a business tax return until you have business income and/or  business expenses, deductions or tax credits.