To claim the 80% waiver, you must complete IRS Form 2210 and file page 1 of the form with your 2018 tax return. The form can be filed with a return filed electronically or on paper. You’ll need ...

IRS Form 2210 helps taxpayers determine if they owe a penalty, often calculated automatically by most tax software. To avoid penalties, ensure withholdings and estimated taxes meet the required ...

The IRS guidance finally arrived in a long memo ... My advice would be, on that Form 2210, there's a box where you can check to say, "I request that you waive this penalty for reasonable cause." ...