What is the 85% waiver for for form 2210?

[KristinaK]

This is a newly introduced percentage for an underpayment penalty waiver. In prior years, if your tax liability for the year was over $1000, the penalty would have been waived if you paid either 100% of prior year's tax liability or 90% of current year's liability. 

Due to changes in the law, a lot of people underpaid their tax liability for 2018. To offer some relief, the IRS came up with a change in the percentage and now, instead of 90%, it is 85% of the current year's liability. 

Also, see this answer for some additional information: https://ttlc.intuit.com/questions/4622891 

UPDATE: The IRS now reduced the percentage down to 80%.