What Are Quarterly Estimated Taxes?

How quarterly estimated taxes works

Quarterly estimated taxes require US freelancers to pay income tax and self-employment tax in four installments due April 15, June 15, September 15, and January 15, because no employer withholds tax from a 1099 income. The IRS charges a penalty when a freelancer underpays during the year, so paying quarterly is not optional once tax liability exceeds $1,000. The safe-harbor rule eliminates penalty risk: a freelancer who pays either 90% of the current year's tax or 100% of last year's tax (110% if adjusted gross income exceeds $150,000) owes no underpayment penalty. Self-employment tax alone runs 15.3% on net earnings, and federal income tax stacks on top, which is why setting aside 25-30% of every client payment covers most freelancers at moderate income levels. The freelancer calculates each installment using Form 1040-ES and remits it through IRS Direct Pay or EFTPS. The pricing implication is direct: the rate a freelancer quotes is pre-tax revenue, not take-home pay. A $10,000 project does not put $10,000 in the bank; roughly $2,500-$3,000 leaves for taxes. A freelancer who prices as if the full invoice is income underprices the work and faces a cash shortfall every quarter. Building the tax set-aside into the rate, and parking it in a separate account the moment each invoice clears, turns the quarterly payment into a non-event instead of a crisis.