WordNet
estimated tax
n. income tax paid periodically on income that is not subject to withholding taxes; based on the taxpayer's predicted tax liability
Usage examples of "estimated tax".
He also gave Andrew Wiggin a thirty-day pass, allowing him the freedom of Sorelledolce as long as he logged in daily with the tax service and turned in a full tax form and paid the estimated tax within that thirty-day period, and promised not to leave the planet until his tax form had been evaluated and confirmed.