Hi, I would like to split the part of the return that I'm receiving as a result of my 3 children with my husband. Is there a way to figure out what portion that would be?

[Critter]

If you are filing a joint return AND using the online program then that will be difficult. I guess you could compute the return with him filing separately and then switch to jointly and then keep adding one child at a time to see the differences in the refund with each adjustment ... not sure if it is worth the effort.  

[xmasbaby0]

".......with my husband"

Sort of....but how did you file?  Did you file married filing separately or a joint return?  If you filed MFS you lose a lot of child-related credits like earned income credit, childcare credit and education credit.   If you file a joint return you are eligible for all of the child-related credits and they will be in your one joint refund.

Look at your 2019 Form 1040 to see the child-related credits you received

PREVIEW 1040

https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing

Child Tax Credit line 13a

Credit for Other Dependents line 13a

Earned Income Credit line 18a

Additional Child Tax Credit line 18b

Child and Dependent Care Credit line 18d