2025 Tax Return with payment and voucher now "missing" by USPS Advantage Ground
Good Morning
My 2025 Tax Return is now "missing" by USPS Advantage Ground as it was too heavy for regular certified. I mailed it in at the post office on March 19th so I do have a tracking number and it is insured. My personal check for underpayment and voucher were enclosed. I filed a missing mail search request and got an email a few days later saying there was "delivery exception". Deadline is fast approaching and I am worried. If the return is delayed past the April 15th deadline, or it is actually lost and not just delayed, I may not know until long after the April 15th deadline. Can I just pay the amount owed, about $950, now online so I do not get fined and pay a penalty in case it never shows up? I will than mail my paper return a second time and hope it gets there. Does that make sense? If I can do that what happens to the original check I sent in with my first return if that return does show up somehow later on ? Will the IRS cash it and than I will have paid my tax twice or will the IRS figure it out and not charge me twice ? What do you think I should do ? Thank you, frank