April 17, the deadline for filing a 2017 tax return.
Single-member LLC (sole proprietorship)
If you're a sole proprietor who formed an LLC with just yourself as a member, you'll file Schedule C with your Form 1040 and include all LLC income and deductions there.
Where do I enter Schedule C?
See this link for more information
LLC Tax Filing Rules
The tax Year 2017 Calendar: Important Dates and Deadlines
https://ttlc.intuit.com/replies/3302298
