# Estimated Tax Payments and Withholding: What You Need to Know
The IRS requires certain taxpayers to pay federal income taxes throughout the year rather than waiting until April. These payments come in two forms: estimated tax payments and withholding from paychecks or other income sources.
Estimated tax payments apply if you're self-employed, have investment income, receive rental income, or earn money that doesn't have taxes withheld automatically. You must file Form 1040-ES and make quarterly payments by April 15, June 15, September 15, and January 15. Missing these deadlines triggers penalties and interest, even if you ultimately owe nothing or receive a refund.
The amount you pay depends on your projected annual income and tax liability. Underestimating can result in penalties, so many people base their 2024 estimates on last year's actual tax bill or calculate their current year earnings carefully.
Withholding works differently. Employees complete Form W-4 when hired, telling their employer how much federal tax to remove from each paycheck. The withholding depends on filing status, number of dependents, expected income, and other income sources. Updating your W-4 prevents surprises at tax time.
The key difference matters for your cash flow. Employees with proper withholding spread their tax liability across the year automatically. Self-employed people and investors must write checks themselves, which requires discipline and planning.
If you're employed and have self-employment income on the side, you might need to file estimated payments for the additional earnings while relying on withholding for your job income. Combining both methods gets complicated fast.
The penalties for underpayment aren't small. The IRS charges interest plus a failure-to-pay penalty. For 2024, the interest rate sits at 8% annually, comp