Why did my tax refund drop from $9k to $4k after e-filing with a solar credit? Expected over $9k but only got $4k. Is it a filing error or IRS adjustment?

only the iRS can answer your question. you should get a notice in a few weeks explaining the change and what to do if you disagree.

you can also call the irs for an explanation

1. Call 1-800-829-1040 between the hours of 7:00 AM – 7:00 PM local time.
2. Press “1” for English or “2” for Spanish.
3. Press “2” for “answers about your personal income taxes.”
4. Press “1” for “questions about a form you have already submitted or a payment or to order a tax transcript.”
5. Press “3” for “all other questions about your tax history or payment.”
6. Press “2” for “all other questions about your tax history or payment.”
7. Do not input your Social Security Number when the recording tells you to.
8. Press “2” for “personal- or individual-tax related question.”
9. Press “3” for “all other inquiries.”
10. Wait to be connected to someone at the IRS. the wait may be long or you may not get through or you may be disconnected.