Estimated Taxes in Your First Year of Business

Starting a business or going freelance is exciting — right up until the moment you realize no employer is withholding tax from your income anymore. That responsibility is now yours, and the IRS expects you to pay as you earn, not in one lump sum next April. Understanding first year estimated taxes is one of the most important — and most commonly mishandled — parts of running a new US business, and getting it wrong can trigger penalties before you even file your first return.

First year estimated taxes are quarterly payments new business owners and freelancers make to the IRS to cover income and self-employment tax that no employer withholds. In your first year you usually owe if you’ll owe $1,000 or more, paid in four installments across the year.

Why first-year business owners owe estimated taxes

The US tax system is “pay-as-you-go.” When you were an employee, your employer withheld federal income tax, Social Security, and Medicare from every paycheck and sent it to the IRS for you. The moment you become self-employed — a sole proprietor, single-member LLC, freelancer, or partner — that withholding disappears. You now owe income tax and self-employment tax (which covers Social Security and Medicare) on your net profit, and you’re responsible for sending it in yourself.

Generally, the IRS expects estimated payments if you expect to owe at least $1,000 in tax for the year after subtracting any withholding and refundable credits. Most first-year founders cross that line quickly, because self-employment tax alone is 15.3% on net earnings up to the annual Social Security wage base (for the 2025 tax year), on top of regular income tax. Solid bookkeeping from day one is what makes these numbers knowable rather than guesswork.

The no-prior-year safe-harbor challenge

Here’s what makes the first year genuinely different. In normal years, taxpayers lean on a “safe harbor”: pay at least 100% of last year’s tax liability (110% if your prior-year adjusted gross income was over $150,000), and the IRS won’t charge an underpayment penalty even if you end up owing more. It’s a comfortable cushion — you just match what you paid before.

But in your first year of business, there is no prior-year return to anchor to. If last year you were a W-2 employee with full withholding, your prior-year “self-employed” tax was effectively zero — but you can’t rely on a zero prior year to justify paying nothing, because the prior-year safe harbor generally requires that you actually filed a 12-month return showing a tax liability. That removes the easy escape hatch and pushes you toward the other safe harbor: paying 90% of the current year’s actual tax. And to hit 90% of a number you don’t know yet, you have to forecast. This forecasting burden is the single biggest reason first-year owners get caught out.

Estimating income when you don’t know it yet

Forecasting income in year one feels impossible — you may not have a single client when you start. The practical approach is to estimate conservatively, then revise. Build a simple projection:

1. Estimate your expected net profit (revenue minus deductible business expenses), not gross revenue.
2. Apply self-employment tax of 15.3% to roughly 92.35% of that net profit.
3. Estimate income tax on your net profit, accounting for the deduction for one-half of self-employment tax and your standard or itemized deduction.
4. Add the two together, divide by four, and that’s your starting quarterly payment.

The IRS provides Form 1040-ES, which includes a worksheet that walks you through exactly this calculation for the current tax year. Recalculate it each quarter as real numbers replace estimates. Smart tax planning in year one isn’t about perfect prediction — it’s about setting aside enough and adjusting often.

The percentage-to-set-aside rule of thumb

Until your projection is dialed in, a working rule of thumb is to set aside 25% to 30% of every dollar of net profit in a separate savings account dedicated to taxes. Higher earners, or those in states with their own income tax, should lean toward 30–35%. This isn’t a precise figure — your actual rate depends on your total income, filing status, deductions, and state — but it keeps cash reserved so a quarterly bill never blindsides you.

Treat that tax account as untouchable. The most common cash-flow mistake new owners make is spending money that was never really theirs because the tax on it hadn’t been paid yet. Moving your set-aside percentage the day each client pays you turns a scary quarterly bill into a non-event.

The quarterly schedule

Federal estimated taxes are due in four installments. For the 2025 tax year the deadlines fall on approximately April 15, June 15, and September 15 of 2025, and January 15 of 2026 (dates shift to the next business day if they land on a weekend or holiday). Note the quarters are not equal three-month chunks — the periods are uneven, which surprises many first-timers. Always confirm the exact dates for your tax year on IRS.gov, because they can move.

If you launch your business mid-year, you generally start making estimated payments for the quarter in which you began earning self-employment income — you don’t owe for quarters that already passed before you had any business income.

How to pay your first year estimated taxes

The IRS makes payment straightforward, and you don’t need to mail a paper voucher. Your main options are:

• IRS Direct Pay — free bank-account transfer, no registration required.
• Electronic Federal Tax Payment System (EFTPS) — free, requires enrollment, good for businesses that want a payment history dashboard.
• Your IRS Online Account — pay and track balances in one place.
• Debit/credit card or digital wallet — processed by third parties, which charge a fee.
• Mailing Form 1040-ES vouchers with a check, if you prefer paper.

You can read the official guidance on paying estimated taxes on IRS.gov. Keep a record of every confirmation number — you’ll reconcile these against your return next spring.

Adjusting as the year unfolds

Your first quarterly payment is a best guess. By the second quarter you’ll have real revenue, and you should re-run the 1040-ES worksheet with updated numbers. If a big project lands and your income jumps, increase the remaining payments. If a slow summer means you over-projected, you can scale back. Because the safe harbor is based on the full year’s actual tax, what matters is that your total payments across all four quarters land close to your real liability. Re-forecasting quarterly is how first-year owners avoid both penalties and tying up cash they didn’t need to.

Don’t forget state estimated taxes

Federal is only half the picture. Most US states with an income tax also require their own estimated payments, with their own forms, thresholds, and due dates — which often, but not always, mirror the federal calendar. A handful of states (such as Florida, Texas, and Washington) have no personal income tax, so residents there only deal with federal. Check your specific state’s department of revenue early, because missing a state estimate carries its own separate penalty on top of any federal one.

The underpayment penalty

If you don’t pay enough during the year, the IRS charges an underpayment penalty calculated like interest on the shortfall for the period it was unpaid — it is not a flat fine. The interest rate is set quarterly and has been meaningfully high in recent years, so the cost of underpaying is no longer trivial. The penalty applies even if you pay your full balance by the April filing deadline, because the issue is when you paid, not just whether you eventually paid. Paying your quarterly installments on time and in the right amount is the only way to avoid it.

Step-by-step: handling your first year estimated taxes

1. Confirm you owe. Will you owe $1,000 or more after withholding? If yes, you’re in.
2. Project your net profit for the year, conservatively.
3. Calculate self-employment tax plus income tax using Form 1040-ES.
4. Divide by four (or by remaining quarters if you started mid-year).
5. Open a dedicated tax savings account and move 25–30% of each payment you receive.
6. Pay each installment on time via Direct Pay or EFTPS.
7. Re-forecast every quarter and adjust the next payment.
8. Check your state’s separate estimated-tax requirements.
9. Keep every confirmation to reconcile on your annual return.

Mistakes to avoid

• Assuming you owe nothing because it’s year one. The lack of a prior-year safe harbor cuts the other way — it makes you more exposed, not less.
• Saving against gross revenue instead of net profit — or worse, not saving at all until April.
• Forgetting self-employment tax and budgeting only for income tax. The 15.3% catches many first-timers off guard.
• Ignoring state estimates until you get a separate state penalty notice.
• Treating the four quarters as equal calendar quarters — they’re not, and the deadlines aren’t 3 months apart.
• Spending the tax money because it’s sitting in your operating account.

Frequently asked questions

Do I really have to pay first year estimated taxes if my business is brand new?

Yes, if you expect to owe $1,000 or more in tax for the year after withholding and credits. Being newly self-employed doesn’t exempt you — in fact, without an employer withholding for you, new business owners are among the most likely to need to make estimated payments.

What happens if I underpay or skip a quarter?

The IRS may charge an underpayment penalty, calculated as interest on the amount you underpaid for the time it stayed unpaid. Paying the full balance in April does not erase a penalty for paying too little earlier in the year.

How much should I set aside for taxes in my first year?

A common starting point is 25–30% of your net profit, moved into a separate tax savings account as you get paid. Adjust upward if you’re a higher earner or live in a state with income tax, and refine the figure once you’ve run Form 1040-ES.

I started my business in July — do I owe for the earlier quarters?

Generally no. You begin making estimated payments for the quarter in which you first earned self-employment income. You aren’t expected to pay estimated tax on income you hadn’t yet earned, but confirm the timing for your tax year on IRS.gov.

Can I just pay everything at the end of the year instead?

You can pay your balance in April, but because the system is pay-as-you-go, paying late can still trigger an underpayment penalty for the earlier quarters. Spreading payments across the year is how you stay penalty-free.

Get expert help with your first year estimated taxes

Year one is the worst time to learn estimated taxes the hard way — and the best time to set up a system that runs smoothly for years. Tranzesta’s US & UK tax specialists will project your liability, build your quarterly payment plan, handle the federal and state filings, and make sure you never overpay or face a penalty. Book a free consultation and start your first year on solid footing.

Disclaimer: This is general information, not personalised tax advice. Tax rules, rates, thresholds, and deadlines change and depend on your individual circumstances — always confirm current figures on IRS.gov and speak to a qualified accountant about your situation.