Line 26 is correct, and I sent all payments in on time, using the vouchers IRS supplied. No to all your other questions.
FYI, when I was filing online with Turbotax, my initial estimated refund was $0. However, when we reviewed my deductions I was asked if I had received the second Recovery Rebate. When I replied no, my expected refund changed to $1200. Thats why we filed for $1200 refund.
