It could be anywhere from 0% (qualified dividend) up to about 24% (non-qualified dividend) and you're subject to the Net Invesment Income Tax). the rate will also vary depending on your filing status and other income.
if you want to be safe from federal underpayment penalties the easiest way is to make sure withholding and timely estimated tax payments equal or exceed 100% of you 2023 tax. That rises to 110% if your adjusted gross income for 2023 was $150,000 or more.
Another option is for withholding and estimated tax payments to equal or exceed 90% of your 2024 tax
If you are subject to state income taxes their laws vary so we would need to know the state.
