Estimate your expected annual income, deductions, credits, and tax liability
Determine whether you need to make quarterly estimated tax payments
Use IRS Form 1040-ES or your country’s equivalent estimated tax form
Calculate each quarterly payment based on your expected annual tax
Set aside money for federal, state, and local taxes if applicable
Pay online through the IRS Direct Pay system, EFTPS, or your tax authority’s payment portal
Pay by mail with a voucher if allowed
Submit payments by the quarterly due dates
Keep records of each payment and confirmation number
Adjust future payments if your income changes during the year
Review penalties for underpayment or late payment
Consult a tax professional if your income is irregular or complex