Yes. That assumes that the estimated tax payments plus any withholding you have during the year will cover within $1,000 your entire tax liability for the year. If $11,250 per quarter is not sufficient to do that after factoring all of your other income and tax withholding, you'll probably have a small underpayment penalty. You might want to overestimate your tax liability slightly and make slightly larger quarterly estimated tax payments for the first few quarters. You can always reduce your later estimated tax payments if you find that you will have paid too much otherwise. For example, make $12,000 estimated tax payments for the first three quarters, then at the end of the year after you generally know your entire tax liability, adjust your 4th quarter payment.
