REASONS YOU MAY HAVE RECEIVED THE WRONG AMOUNT
For example, if your income was significantly higher or you didn’t claim a dependent on your 2020 tax return, you might get a lower amount than you should this year based on the prior figures.
Also, if your family didn’t get a July payment, but your first arrived in August, the total advance credit will be divided over five months instead of six months, resulting in larger monthly payments.
You could also receive a potential overpayment if your income went up this year, meaning the IRS is sending you too much money based on old information.
The IRS said you should be able to sign in to the Update Portal to make the appropriate adjustments at some point in September.