The third round of EIP or stimulus payments began mid-March 2021. Individuals could have received up to $1,400 and $2,800 for married couples filing a joint return. Qualifying dependents may have also received $1,400. Unlike the first two payments, EIP3 was not limited to children under 17-years. Families may have received the payment based on all of the qualifying dependents claimed on the tax return. Most families received $1,400 per person, meaning, a single person with no dependents may have received $1,400 while a family of four may have received $5,600. Notice 1444-C was sent following the payments and Letter 6475 will be issued in January 2022 with a combined total. 
If you no longer have Notice 1444-C, or have not received Letter 6475, log in to your IRS Online Account to get the accurate amount of EIP3 received. 
1. Go to irs.gov.
2. Select “View Your Account Information.”
3. Select “Log in to your Online Account” and follow the prompts provided.