My 9 year old daughter got her SSN last year. Should I replace her ITIN for the SSN in my 2020 tax return?

[BillM223 · Accepted solution]

Yes, absolutely!

Certain benefits are not available on dependents with ITINs instead of an SSN, so overwrite the ITIN with the SSN every place you see it.

[NCperson]

one of those benefits is you should see $1100 on Line 30 for the first two stimulus payments. 

[DanielV01]

Benefits available for the Social Security Number vs. the ITIN:

• Child tax credit.  You can receive $2000 for your 9-year old daughter instead of $500 (if you qualify otherwise).  A dependent with an ITIN cannot receive this benefit.
• Recovery Rebate Credit.  This credit is discussed by @NCperson
• Earned Income Credit calculation.  Whether or not you receive earned income credit will depend on whether you (and your spouse, if married) also have a Social Security Number, as well as the amount of earned income you claim in 2020.

No additional benefits are available to a dependent with an ITIN as compared to a Social Security Number.  But even if there were no other benefits, once an individual receives a Social Security Number, their ITIN is no longer valid.  So to claim your daughter as a dependent for any benefit, you must use her Social Security Number, because her ITIN is no longer valid.