If you did not receive the stimulus payment, on your 2020 federal tax return you will be able to enter the amount of the payment that you are eligible to receive on the Form 1040 Line 30.
"In essence, the 2019 stimulus check acts as an advance of your 2020 income tax refund. This means when you prepare your 2020 income tax return, there will be a line to include the section 6428 credit. The credit on your 2020 return is subtracted by any amount received as a stimulus check in 2020. If the amount you received as a stimulus check is less than the credit you are due, the difference will be included as part of your 2020 refund. If you have been overpaid by receiving the stimulus check, however, you will not be required to return any excess amount".
@bhmayton - the responses presume you file a tax return for 2020. I kinda got the sense from your question that you were a 'non-filer' in 2018-2019 (where did you enter your information? it was otherwise automatically calculated by the IRS from your 2018 or 2019 tax return).
Look at Line 30 of Form 1040 on your 2020 return - that is where any additional stimulus credit due will appear.
I filed for both '18 and '19. I was just under the $75K individual limit for both years and have 2 children, 5 and 8. My employer directed me to the IRS get my payment website to ensure my information was up to date.
@bhmayton - when you complete your tax return in the next few months, look critically at line 30 on Form 1040. That is where any stimulus due to you will show up. Understand that the credit is based on your 2020 income level. Last spring, 2018 / 2019 incomes were used as an estimate; this is the way the law was passed.
you mentioned the $75,000 threshold for income if you file single, which is correct, but if you file Head of Household (you mentioned two children who I assume are your dependents), the threshold is $112,500 before the stimulus begins to phase out.
"100% my dependents" means that they live with you more than half the year (you are the custodial parent) and only you claim them on your tax return.
There is a special rule in the case of divorced & separated (including never married) parents. When the non-custodial parent is claiming the child as a dependent/exemption/child tax credit; the custodial parent is still allowed to claim the same child for Earned Income Credit, Head of Household filing status, and day care credit. This "splitting of the child" is not available to parents who lived together at any time during the last 6 months of the year; then only one of you can claim the child for any tax reasons. The tax benefits may not be split in any other manner.
Note in particular that the non-custodial parent can never claim the Earned Income Credit, Head of Household filing status or the day care credit, based on that child, even when the custodial parent has released the dependency to him.
So, it's good idea to let the other parent know that you will be claiming those items, as many first time divorced parents are not aware of this rule and may try to claim those items, which will cause the IRS to send out letters.
Scroll down to "Children of divorced or separated parents (or parents who live apart)"
You can if you are the custodial parent. The IRS goes by physical custody, not legal custody. The custodial parent is the parent the child lived with for more than 182 nights in the tax year.