If the IRS reduced your refund they will mail you a letter. Check IRS Where's my refund to see what they sent you.
https://www.irs.gov/refunds/
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.
https://www.irs.gov/uac/tax-refund-offsets-pay-unpaid-debts
IRS Treasury Offset Program Call Center at 1-800-304-3107
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,
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 $39.99)
How can I see my TurboTax fees?
https://ttlc.intuit.com/questions/2565973-how-do-i-review-my-fees-in-turbotax-online
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
NOTE: You can contact the IRS Treasury Offset Program Call Center at 1-800-304-3107 to ask if they have an offset for you on file. TurboTax would not have that information.
https://turbotax.intuit.com/tax-tips/tax-payments/who-can-garnish-an-income-tax-refund/L7cPPzDyc
