Don’t know about the deadline for your K-l information, but the Federal law requires both W-2’s AND 1099’s to be in the mail to you no later than January 31 of each year.
I am a life long bookkeeper. I have carried as many as 19 clients at a time, and did this alone—no employees. I never missed a deadline for either W-2’s or 1099’s.
There is a serious fine against those who do not get the info out on time.
I have portfolios with JP Morgan, Fidelity and Hilltop Securities... all three sent notes saying the final ones won't be ready until 3/16.
My accountant says this is quite normal for most these days... that's just the way it is.