Where is the rest of my federal refund?

Your refund could be offset.

The IRS and State Governments have the ability to offset a refund to pay for certain past due debts.  You generally will receive a letter stating what the offset was for.   

The IRS provides a toll-free number, (800) 304-3107, to call for information about tax offsets.

MY REFUND WAS LESS THAN I EXPECTED

https://ttlc.intuit.com/community/refunds/help/why-is-my-direct-deposited-refund-or-check-lower-than-the-amount-in-turbotax/00/25594

There can be a number of reasons why your refund was less than the amount you expected. First of all, look carefully at your actual tax returns. Next——check the IRS refund site https://www.irs.gov/refunds to see what the IRS says they issued for your refund.  Sometimes the IRS reduces your refund. If the IRS reduced your refund they will send you a letter in several weeks.

There is sometimes confusion about the amount of refund to expect when users misinterpret the “summary” they saw in TurboTax. The amount of your refund is on your tax return.  Federal refund is on line 35a on Form 1040  State tax forms are all different so we cannot tell you what line to look at on your state form.  BUT it is important to actually LOOK at your tax return forms yourself and see the amounts of your tax refunds and/or tax due.  A lot of confusion would be avoided by doing that.

Be aware also that your Federal refund and state refund do NOT come together.  Federal and state tax returns are processed by two completely separate entities.  There is no rule as to which one will come first,

It is also possible that your state reduced your refund for debts owed in your state—if the state reduced your state refund you will receive a letter from the state.

Did you choose to have TT fees deducted from your Federal refund?  (Remember that if you did that, you also agreed to an extra refund processing fee of $40 or $45  in CA)

How can I see my TurboTax  fees?  

https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-account-billing/review-fees-turbotax-online/L1XnIzgzg_US_en_US?uid=m682vq7k

 refund offset.

https://www.irs.gov/uac/tax-refund-offsets-pay-unpaid-debts

 IRS Treasury Offset Program Call Center at 1-800-304-3107

 https://www.irs.gov/uac/tax-refund-offsets-pay-unpaid-debts

https://ttlc.intuit.com/community/refunds/help/what-is-a-refund-offset/00/26301

Reduced Refund      https://www.irs.gov/taxtopics/tc203

What is Refund Processing Service?

Santa Barbara Tax Products Group, LLC  (SBTPG) is the bank that handles the Refund Processing Service when you choose to have your TurboTax fees deducted from your refund. This option also has an additional charge from the bank that processes the transaction. 

You can contact them SBTPG, toll-free, at 1-877-908-7228 or go to their secure website www.sbtpg.com