Not sure what you men bt dummy SMLLC, but if it's not an active business the expenses are not deductible,.
correct. so in that case (when expenses are not deductible) can I skip filing Schedule C? what will I enter in it anyway? think of it as I am still setting up my business and have no customers.
If you are in the process of setting up your business, then all your expenses are capitalized as either:
Once you begin your business activity, then you will amortize those expenses.
Nothing needs to be filed with your federal tax return until then.
You will not file a SCH C until the tax year your LLC is actually "open for business". All expenses incurred prior to being open for business are start up expenses, and can not be claimed/reported until the tax year you are open for business. It does not matter if the statup expenses were incurred in prior tax years either. Point is, nothing can be claimed until the tax year you are actually open for business.