Without seeing your last tax return, you may have had to pay an underpayment penalty. Or, you very well could have had to pay the extra self-employment tax on self-employment income if you received a 1099-NEC for consulting work.
We recommend reaching out to TurboTax Live experts to discuss your individual situation further, and to use the TurboTax TaxCaster to determine if you should make an estimated tax payment.