Yes, if there is a problem with these things that can delay or reduce your refund, the IRS will send a letter and depending on the reason your refund status on the IRS website will mention it:
Also, by law, the IRS cannot issue refunds for people claiming the Earned Income Tax Credit (EITC) or Additional Child Tax Credit (ACTC) before mid-February 2018.
- The law requires the IRS to hold the entire refund — even the portion not associated with EITC or ACTC.
The IRS expects the earliest EITC/ACTC related refunds to be available in taxpayer bank accounts or debit cards starting on Feb. 27, 2018, if direct deposit was used and there are no other issues with the tax return.