Why Freelancers Must Pay Taxes During the Year

The United States tax system operates on a pay-as-you-go basis. The IRS expects taxpayers to pay income tax throughout the year as income is earned, not in one lump sum at filing time. For W-2 employees, this happens automatically through payroll withholding. Every paycheck has federal income tax, Social Security tax, and Medicare tax deducted before the employee ever sees the money. The employer sends those withholdings to the IRS on the employee’s behalf, so by April 15 the employee has already paid most or all of the tax they owe.

Freelancers, independent contractors, sole proprietors, and other self-employed individuals do not have an employer withholding taxes from their income. When a client pays a freelancer, the full gross amount arrives with no taxes removed. This means the freelancer is responsible for sending tax payments to the IRS on their own throughout the year. These payments are called estimated tax payments, and they serve the exact same purpose as payroll withholding: they are a prepayment of the taxes that will ultimately be calculated on the annual tax return.

Estimated Taxes Are a Prepayment of Your Tax Return Balance

A common misconception is that estimated tax payments are a separate or additional tax. They are not. Estimated payments are simply advance installments toward the total tax liability that will be computed on Form 1040 at year-end. When your tax return is prepared, line 24 shows your total tax for the year. Line 37 shows the total payments and credits applied against that tax, which includes all estimated tax payments made during the year plus any other withholding. If your payments exceed your total tax, you receive a refund. If your payments fall short, you owe a balance due.

Think of it this way: the tax return is the final accounting. Estimated payments are deposits made in advance toward that final bill. The IRS requires these deposits throughout the year because they fund ongoing government operations and because the tax code was designed around the principle that taxes are paid as income is earned.

The Quarterly Payment Schedule

The IRS divides the tax year into four unequal payment periods. Estimated tax payments are due on April 15, June 15, September 15, and January 15 of the following year. Each payment covers income earned during the preceding period. Many freelancers find it helpful to set aside 25 to 30 percent of each payment they receive from clients into a dedicated savings account, then transfer the accumulated amount to the IRS on each quarterly due date.

Payments can be made online through IRS Direct Pay, through the Electronic Federal Tax Payment System (EFTPS), or by mailing Form 1040-ES with a check. Most states with an income tax also require separate quarterly estimated payments to the state tax authority.

The Underpayment Penalty and How It Works

If a freelancer does not pay enough estimated tax during the year, the IRS imposes an underpayment penalty under IRC Section 6654. This penalty is essentially interest charged on the amount that should have been paid by each quarterly deadline but was not. The penalty rate fluctuates with federal short-term interest rates and is assessed separately for each quarter. It is not a flat fine but rather a daily interest calculation, which means the longer the underpayment persists, the larger the penalty grows.

The underpayment penalty is calculated automatically when the tax return is filed if total payments fall short of what was required. It appears on Form 2210, which can be attached to the return. In many cases, taxpayers are surprised to see this penalty because they assumed paying everything at filing time was acceptable. The IRS does not treat April 15 as the only payment deadline for self-employed individuals.

The Safe Harbor Rule: How to Avoid the Underpayment Penalty

The IRS provides a safe harbor rule that allows taxpayers to avoid the underpayment penalty entirely, even if they end up owing a balance when they file. There are two primary safe harbor thresholds:

• 100% of prior year tax: If your total estimated payments and withholding during the current year equal at least 100% of the total tax shown on your prior year return (the previous year’s Form 1040, line 24), you will not owe an underpayment penalty regardless of how much you owe on the current year return.
• 110% rule for higher earners: If your adjusted gross income (AGI) on the prior year return exceeded $150,000 (or $75,000 if married filing separately), the safe harbor threshold increases to 110% of the prior year tax. You must pay at least 110% of last year’s total tax through quarterly payments to be protected from the penalty.
• 90% of current year tax: Alternatively, if your payments equal at least 90% of the tax shown on the current year return, you also avoid the penalty. This option requires accurately estimating current-year income, which can be difficult for freelancers with variable income.

For most freelancers, the safest and simplest approach is the prior-year safe harbor. You already know exactly what last year’s tax was because it appeared on your filed return. Dividing that amount by four and paying each quarter guarantees penalty avoidance, even if your income increases substantially during the current year. At The Reed Corporation, we routinely calculate safe harbor amounts for our clients so they know the minimum quarterly payment needed to stay penalty-free.

Who Is Required to Make Estimated Payments

The IRS generally requires estimated payments from any taxpayer who expects to owe $1,000 or more in tax after subtracting withholding and credits. This threshold is low enough that most freelancers earning even modest self-employment income will exceed it. If you earned $10,000 or more in freelance income during the year, it is almost certain that your combined income tax and self-employment tax will exceed $1,000.

Certain taxpayers may be exempt from the requirement even if they owe tax at filing time. For example, if you had no tax liability in the prior year and were a U.S. citizen or resident for the entire year, you may not owe a penalty. However, this exception rarely applies to established freelancers who have been earning self-employment income for multiple years.

Practical Tips for Managing Estimated Payments

At The Reed Corporation, we advise freelance clients to treat estimated taxes as a non-negotiable business expense rather than an optional savings goal. Setting aside funds immediately when client payments arrive prevents the common problem of spending money that was never truly available. Opening a separate high-yield savings account specifically for tax reserves creates a clear psychological and practical boundary between earned income and tax obligations.

For clients with highly variable income, we often recommend the annualized income installment method, which allows each quarterly payment to be based on income actually earned during that specific quarter rather than a flat one-fourth of the annual estimate. This method requires more calculation but prevents overpayment during slow quarters and underpayment during busy ones. The calculation is done on Schedule AI of Form 2210.

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