You have to compare this year with last year’s return LINE BY LINE and see what changed. Maybe you’ll spot something you left out or entered wrong. Common things are leaving the decimal point out or typing a comma for a decimal point, or typing an extra digit. Getting the wrong taxable amount on a 1099R entry or entering the 1099R wrong and getting hit with a penalty. Missing the qualified dividends in 1099-DIV box 2a. I could go on and on.
Why did your refund go down this year?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-refund/refund-go-compared-last-year/...
