Can I make a tax payment for 2017 prior to filing return and if so, what form and will it save me penalty. Is there a date were if paid I will not be penalized?

[hardav14]

I underpaid 2017 federal taxes by $6,000. I can't file until I receive K-1. Can I make a tax payment of $6,000 for 2017 prior to filing return and if so, what form and will it save me penalty. Is there a date were if paid I will not be penalized?

[fanfare]

wow. visit www.irs.gov/directpay. Click "Make a payment"

select Extension. 

Your payment of $6,000 (or any amount) will automatically give you six months more to file, 
April 15th is the payment deadline, that never changes.