The "Where's My Payment" tool is now active.
My check is due to be deposited next week. Unfortunately, it will almost assuredly be based on my 2019 tax return, rather than on my 2020 return. That means a $1,400 difference to me - for 2020 I can claim an adult dependent, but could not for 2019. The IRS still hasn't processed the Daughter's 2019 tax forms yet so she will get nothing in this round, just as happened with round 2. (I really do believe they lost the forms, but apparently there's well over a million unprocessed 2019 tax returns sitting at the IRS still. So maybe not.) Technically, I should be the one getting the payment for her, as she's an adult dependent, which disqualifies her from getting a payment on her own anyway.
I had pretty much settled on sending in an amended return after they finally do process my already-submitted-but-not-processed 2020 paperwork; however, according to an article in Kiplinger dated 11 March: Under the law, if your 2020 tax return isn't filed and processed by the time the IRS starts processing your third stimulus check, the tax agency will use your 2019 tax return to get the information it needs to calculate your payment. If your 2020 return is already filed and processed, then your stimulus check will be based on your 2020 return. If your 2020 return is filed and/or processed after the IRS sends you a stimulus check, but before July 15, 2021 (or September 1 if the April 15 filing deadline is pushed back), the IRS will send you a second payment for the difference between what your payment should have been if based on your 2020 return and any payment actually sent based on your 2019 return.
So the "dependent" payment should just show up automatically at some point this summer.
I will be ~so~ happy to be able to file electronically next year! And just have a bog-standard 1040.