I have one member LLC in CA, and no income from it. I created last year a schedule k1 for myself. This year I see it's easier just to report on Schedule C my lost. Can I just delete the Schedule k1, which came from last year from my TurboTax file without penalty, and keep going with Schedule C?
What kind of LLC do you have? You might need to amend 2018 and take off the K-1 and fill out schedule C for your LLC. Unless you have a Single Member LLC and selected to be an S corp. Then you have to file a 1120 S business return, then you will get a K-1 or W2 from the 1120 S. That is a whole other situation and you will need help.
If you have a SMLLC that is not an S corp it is a disregarded entity and you file it on Schedule C.
Try deleting it this way. Go to the K-1 interview section here
Federal on the left
Wages and Income
Then scroll way down to Business Items (or S-Corps, Partnerships, Trusts)
Schedule K-1 - Click the Start or Revisit button
If the first screen says "Do you want to review Schedule K-1?". You have to answer yes and then click Update by the Schedule K-1 type (LLC, S corp, trust). The next screen is the Summary screen listing all of the K-1 entered for that type of entity. You can review, edit or delete it there.
Sounds like you may need to amend your 2018 tax return. A single member LLC is reported on SCH C as a physical part of your personal 1040 tax return. But first:
Back in 2018 or before did you file IRS Form 2553 to treat your single member LLC "like an S-Corp"? Or did you file IRS Form 8832 to treat your single member LLC "like a C-Corp"? If you did either, then you flat out can not report your business income/expenses on SCH C. You are required to report all business income/expenses on 1120 for a C-Corp or 1120-S for an S-Corp. Then (and only then) would the C-Corp or S-Corp issue you any kind of tax reporting document.