late K-1 - question as to what to do

I'm hoping someone can help.

I am expecting a K-1 but it is late, I don't think I'll get it in time to file today. It likely will show about 2k income.

I am also needing to file a 2210 as I didn't withhold enough last year, so I really need to file today.

 

Suggestions? Should I take a guess at the 2210 numbers and amend it later? Leave the 2210 out altogether and file an amended return later? I want to avoid filing for an extension as that will only add to the penalty on the 2210, but right now I don't see any good options.

 

Thanks for any ideas.