How to File Quarterly Taxes for the First Time (Step-by-Step)

Quarterly estimated taxes are due four times per year: April 15, June 16, September 15, and January 15. If you expect to owe at least $1,000 in federal taxes for the year (after withholding), you must make quarterly payments or face an underpayment penalty. The simplest approach for first-timers is the "safe harbor" rule: pay 25% of last year's total tax bill each quarter — no penalty regardless of what you actually owe.

How to file quarterly taxes first time

1. Determine if you need to pay — if you expect to owe $1,000+ in federal tax for the year (after withholding), quarterly payments are required. This threshold is easily hit with $5,000–$10,000 of freelance income.
2. Choose your calculation method — either safe harbor (25% of last year's total tax, cleanest for first-timers) or 90% of current year's expected tax, divided into four payments.
3. Calculate the amount — if last year's total federal tax was $8,000, pay $2,000 each quarter. First year as self-employed? Use 90% of estimated current year tax ÷ 4.
4. Pay through IRS Direct Pay — at pay.irs.gov. Free, no account needed, instant confirmation. Select "Estimated Tax" as payment type and the appropriate year.
5. Set calendar reminders — the four due dates: April 15, June 16, September 15, and January 15. Missing a date triggers a penalty on that quarter's underpayment.

The safe harbor rule: the easiest approach for first-timers

The safe harbor rule eliminates underpayment penalties regardless of how much you actually owe for the year:

• Pay at least 100% of your prior year's total tax over four equal quarterly payments (25% each), OR
• Pay at least 90% of your current year's actual tax liability over four payments.
• If your prior year AGI exceeded $150,000, the safe harbor is 110% of prior year tax (not 100%).

For someone who just transitioned to self-employment, the 100%/110% prior year method is the safest: it is based on known information from last year's return, not an estimate of this year's income. Even if you earn significantly more this year, you will not be penalised as long as you matched last year's total tax.

How to estimate your current year tax if you are new to self-employment

The underpayment penalty: what you actually risk

The underpayment penalty is calculated quarterly on the shortfall between what you paid and the required amount. The rate is the federal short-term rate plus 3% — approximately 7–8% annualised in 2025. This means:

• If you underpay by $2,000 for the full year, the penalty is approximately $140–$160.
• The penalty applies even if you pay the full balance when you file in April.
• Following the safe harbor rule eliminates the penalty entirely — even if you owe $10,000+ in April.

The underpayment penalty is rarely catastrophic on its own — but it adds insult to a large April tax bill. The bigger risk of not paying quarterly is the April cash flow shock: owing $15,000+ in a single payment is manageable if you expected it, painful if you spent the money.

State quarterly taxes: don't forget these

Most states with income tax also require quarterly estimated tax payments if you have self-employment income. The threshold and safe harbor rules vary by state. Key points:

• Due dates align with federal dates in most states, but not all.
• Pay through your state's revenue department website (search "[state] estimated tax payment").
• States with no income tax (Texas, Florida, Nevada, etc.): no state quarterly payment required.
• California uses different due dates: April 15, June 15, January 15, and April 15 — the fourth quarter is due in April of the same tax year.

How much to set aside monthly for taxes

A practical rule of thumb for full-time freelancers: set aside 25–30% of gross self-employment income into a separate savings account each month. This covers:

• Federal self-employment tax (~15.3%)
• Federal income tax (22–24% bracket for most full-time freelancers)
• State income tax (varies)
• Buffer for deductions that reduce the final bill

At the 25–30% rule, most freelancers will have a modest surplus after paying their annual tax bill — extra savings rather than a frightening shortfall.

Authoritative sources

• IRS — Estimated Taxes — Official IRS guidance on who must pay estimated taxes, the safe harbor rule, how to calculate payments, and the current underpayment penalty rate.
• IRS — Form 1040-ES (Estimated Tax for Individuals) — The official form with worksheets for calculating quarterly estimated tax payments, including the annualised income method for uneven income streams.

Key takeaways

• Quarterly estimated taxes are due April 15, June 16, September 15, and January 15. The quarterly periods are not equal — Q2 covers only May and June (2 months).
• The safe harbor rule: pay 100% of last year's total tax (110% if prior AGI > $150,000) divided into four equal payments. This avoids the underpayment penalty entirely, regardless of your actual current year liability.
• Pay through IRS Direct Pay at pay.irs.gov — free, no account needed, instant email confirmation, available 24/7. Select "Estimated Tax" and the correct tax year.
• The underpayment penalty is approximately 7–8% annualised — typically $100–$200 for a moderate shortfall. The real risk is the April cash shock of a large unexpected bill, not the penalty itself.
• Set aside 25–30% of gross freelance income monthly in a separate savings account. Most freelancers who follow this rule have a modest surplus — not a shortfall — after the annual tax payment.
• State quarterly payments are also required in most income tax states. California has different due dates. Check your state's revenue department for state-specific rules and payment portal. Understanding your 1099-NEC obligations — income reporting and expense deduction — is the foundation before calculating quarterly amounts.

Frequently asked questions

When are quarterly estimated taxes due?

The four quarterly estimated tax due dates in 2025 are: April 15 (Q1), June 16 (Q2), September 15 (Q3), and January 15, 2026 (Q4). Note that Q2 is only 2 months (May–June) and the periods are unequal. If a due date falls on a weekend or federal holiday, it moves to the next business day.

How do I calculate quarterly estimated taxes?

Three methods: (1) Safe harbor — pay 100% of last year's total tax bill (110% if your prior year AGI exceeded $150,000) divided by 4. This avoids underpayment penalties regardless of what you owe. (2) Annualised income method — estimate your actual income and deductions each quarter. (3) 90% of current year — estimate current year tax and pay 25% each quarter. Safe harbor is simplest for first-timers.

What happens if I don't pay quarterly taxes?

If you underpay quarterly estimated taxes, the IRS charges an underpayment penalty — currently the federal short-term rate plus 3%, calculated quarterly. For 2025, this is approximately 7–8% annualised. The penalty applies even if you pay the full amount when you file in April. The penalty is typically small (hundreds of dollars) but avoidable by following the safe harbor rule.

How do I actually pay quarterly estimated taxes?

The easiest methods: (1) IRS Direct Pay at pay.gov — free, no account needed, pay from checking/savings. (2) EFTPS (Electronic Federal Tax Payment System) — free, requires enrollment, but allows scheduling payments in advance. (3) IRS2Go mobile app. (4) Mail Form 1040-ES with a check. Most self-employed people use IRS Direct Pay or EFTPS. State quarterly taxes (where required) are paid through your state's revenue department website.

Do I need to file quarterly taxes if I also have a W-2 job?

If you have both W-2 employment and self-employment income, you may be able to avoid quarterly estimated payments by increasing your W-2 withholding to cover the additional tax from self-employment. Ask your employer to withhold extra from each paycheck (Form W-4, extra withholding line). If your W-2 withholding plus self-employment taxes owed is within the safe harbor amounts, no quarterly payments are required.