How to Pay Quarterly Taxes: 2026 Contractor Guide for Trades Leaving W-2 Withholding Behind

If you spent years getting a W-2 from someone else's shop and just started pulling your own plumbing or HVAC jobs, the first change that hits isn't the work — it's that no one is withholding for you anymore. Withholding was automatic when you had a W-2. Now it's gone, and the IRS still expects its money during the year, not just at filing time. The replacement mechanism is quarterly taxes. This guide walks through exactly when those payments are due, how much to send, and the safe harbor rule that makes the number fixed and knowable even when your income swings with the bid calendar.

For a broader view of how quarterly taxes fit into the rest of your contractor tax picture — entity choice, deductions, retirement — our contractor tax planning hub pulls it all together.

What are quarterly taxes and why do I have to pay them?

Quarterly taxes are estimated tax payments you send to the IRS four times a year because no employer is withholding — the tax code requires you to pay as you earn, not in one lump at filing. The rule lives in IRC §6654, and it applies to sole proprietors, single-member LLCs, partners in multi-member LLCs, and S-Corp owners alike. The business structure changes where the profit shows up on your return, but the estimated-tax obligation follows the person every time.

When you had a W-2, your employer sent tax to the IRS out of every paycheck automatically. Now that you're the business, that mechanism is gone. If you're a sole proprietor or single-member LLC, your business profit lands on Schedule C, and you owe both income tax and self-employment tax on that profit as you earn it.

If you elected S-Corp status, the mechanics split. You pay yourself W-2 wages through payroll, and federal and state income tax plus FICA gets withheld from those paychecks just like any employee. But the remaining profit comes to you as distributions, and no tax is withheld on them. You still owe income tax on that profit, and if the distribution is large enough, you'll need to make estimated payments to cover it. In our experience representing contractors in audits, a salary of roughly one-third of net profit is the level that consistently holds up; the rest passes through as distributions and needs estimated tax coverage. You can read more about that split in our LLC vs S-Corp for contractors breakdown.

For partners in a multi-member LLC, the partnership itself pays no income tax; the profit lands on your personal return instead, and you receive a K-1 showing your slice of the profit to report. The partnership may make estimated payments on your behalf, but if it doesn't (or doesn't cover enough), you're on the hook personally.

When are the 2026 quarterly tax deadlines?

The four estimated-tax payment deadlines for 2026 are April 15, June 15, and September 15 of 2026, and January 15 of 2027. These are not spaced in clean three-month intervals — the gap between Q1 and Q2 is only two months, which catches people every year.

• Q1 payment: April 15, 2026 — covers January through March
• Q2 payment: June 15, 2026 — covers April and May
• Q3 payment: September 15, 2026 — covers June through August
• Q4 payment: January 15, 2027 — covers September through December

If January 15 falls on a weekend or holiday, the deadline shifts to the next business day. If you file your full tax return by the end of January and pay everything you owe, you can skip the Q4 payment entirely — the return itself counts as the final settlement.

How much should I pay each quarter?

The exact amount depends on your profit, your filing status, and your state, but the IRS gives you two ways to calculate it — and one of them makes the number fixed and knowable. You can use either method, and you can switch methods quarter to quarter.

The first method is the current-year estimate: you project what your full-year profit will be, calculate the total tax on that profit, and send one-fourth each quarter. This works well when income is steady and predictable. For a contractor whose jobs are booked months out, that might be manageable. For one whose income swings with weather and bid cycles, guessing wrong means either overpaying (tying up cash) or underpaying (triggering a penalty).

The second method is the safe harbor: a payment target you hit during the year so the underpayment penalty can't touch you, even if you still owe at filing. This is where IRC §6654 hands you a deal most contractors don't know they're being offered. You owe no underpayment penalty if your payments during the year hit the lesser of 90% of this year's total tax or 100% of last year's total tax. If your adjusted gross income topped $150,000 on last year's return, that 100% jumps to 110%. And if you owe under $1,000 at filing after subtracting your payments and withholding, there's no penalty at all regardless of which method you used.

For a business whose income swings with the weather and the bid calendar, the prior-year safe harbor turns quarterly taxes into a fixed, knowable number set every April. You don't have to predict a volatile year. Every April, take last year's total tax from your Form 1040, multiply by 1.0 (or 1.1 if your AGI was over $150,000), divide by four — that's your safe-harbor schedule for the year, done. The underpayment penalty question is settled no matter how big this year turns out. You might still owe a large balance at filing if income jumps, but you won't owe penalties on top of it.

The one catch: the safe harbor uses last year's total tax, which only works if you actually filed last year. If this is your first year self-employed, there's no prior-year number to anchor to, and you'll need to estimate current-year tax and pay 90% of it to avoid the penalty.

How do I calculate my quarterly payment if it's my first year?

First-year contractors have no prior-year tax to fall back on, so you estimate current-year profit and pay 90% of the projected tax in four installments. The math breaks down into three pieces: income tax, self-employment tax, and state tax.

Start with your expected net profit. That's gross receipts minus all business expenses. If you're using cash basis, that's the money you actually received minus the money you actually spent.

From that profit, self-employment tax runs 15.3% on the first $184,500 of net earnings under IRC §1401. That $184,500 is the 2026 Social Security wage base. Above that line, the SE tax rate drops to 2.9%, covering only the Medicare portion. You get to deduct half of your SE tax against your income, which softens the blow slightly.

Then layer on federal income tax at your marginal rate. For 2026, the 22% bracket for married filing jointly tops out at $211,400 of taxable income. For single filers, the 22% bracket tops out at $105,700. The standard deduction is $32,200 for married filing jointly in 2026. For single filers, it's $16,100.

Our standing advice to trade contractors: sweep 25 to 30 cents of every net dollar into a separate tax account the day you take the draw. In a no-income-tax state, 25% of net income covers the federal bill. In California, make it 30% to account for state income tax. California also charges a 1.3% SDI rate with no wage ceiling, which is baked into that 30%. In an unusually profitable year, push it to 35% or higher. Higher profit pushes you into higher brackets, and the set-aside needs to keep pace. Always apply this to net income, never gross — your materials and subcontractor costs aren't taxable to you. You can see the full breakdown of that set-aside logic in our how much to set aside for taxes guide.

How do I actually send the payment to the IRS?

The fastest method is IRS Direct Pay, a free online bank-transfer tool at IRS.gov that lets you schedule a payment up to 30 days in advance. You select the tax year (2026), the payment type (estimated tax), and the quarter, and the money moves from your checking account with no fee. You get an immediate confirmation, and you can set up all four quarters in one sitting if you want.

If you prefer to pay by card, the IRS approves a small number of payment processors that charge a processing fee based on the payment amount. For a typical quarterly payment, the fee runs roughly 2% — worth it if you need the cash-flow flexibility of a credit card, otherwise stick with Direct Pay.

You can also mail a check with a Form 1040-ES payment voucher. The voucher has the correct mailing address for your state printed on it. This works, but it's the slowest method and gives you no electronic confirmation — if the check gets lost, you won't know until a notice arrives.

For businesses, EFTPS is the equivalent tool. If you're running payroll for your S-Corp, you'll already have an EFTPS account for federal tax deposits, and you can use it for your personal estimated payments too.

Don't forget your state. California's FTB runs its own Web Pay system, separate from the IRS. Most states with an income tax have an equivalent online portal. If you're in a no-income-tax state — Texas, Florida, Nevada, Washington, and a few others — there's no state estimated payment to worry about, only federal.

What happens if I miss a quarterly payment or pay late?

The IRS calculates the underpayment penalty as interest on the shortfall for each quarter it was underpaid. The rate is the federal short-term rate plus 3 percentage points, set quarterly under IRC §6621, so it moves with prevailing interest rates. On a $3,000 underpayment for one quarter, the penalty is a fraction of that amount — not catastrophic, but not free money either, and it compounds each quarter the shortfall continues.

The penalty is calculated on Form 2210, which the IRS prepares automatically if they think you owe it and sends you the bill. You can also file Form 2210 yourself to show that your income was unevenly distributed through the year — the annualized income installment method — which can reduce or eliminate the penalty if you earned most of your income in the second half of the year. That's common for contractors whose busy season is summer and fall.

If you do get hit with a penalty and you have a clean three-year filing history, penalty abatement is available — that means asking the IRS to erase a penalty, and with a clean three-year history, they routinely say yes. The IRS routinely grants first-time relief on request. Starting summer 2026, this becomes even easier: the IRS is rolling out the Automatic Exemption from Penalty (AEP), where qualifying taxpayers simply won't be assessed the penalty at all — no request needed. You can check eligibility details at IRS.gov.

Should I pay equal amounts each quarter or adjust based on income?

Equal payments are simpler and satisfy the safe harbor, but if your income is seasonal, the annualized income method can lower your penalty if you end up owing one. The tradeoff is simplicity versus precision.

If you're using the prior-year safe harbor, four equal payments is the whole point — one number, divided by four, done. You send the same amount each quarter regardless of what you earned that period. If income drops, you've overpaid but you'll get it back at filing. If income spikes, you may owe a balance at filing but no penalty.

If you're using the current-year estimate and your income is lumpy — say, $20,000 in Q1 and $80,000 in Q3 — you can use Form 2210's annualized income method to tie each payment to the income actually earned by that point. This front-loads less money in slow quarters and more in busy ones, which helps cash flow. The downside is that you have to run the calculation each quarter and file Form 2210 with your return, which adds complexity. For most contractors in their first few years, equal payments under the safe harbor are the better trade — the simplicity is worth more than the interest you'd save.

For a deeper look at how self-employment tax interacts with your quarterly payments — the 15.3% calculation, the wage base, and the deduction for half your SE tax — see our self-employment tax for contractors guide.

How does my business entity change my quarterly tax obligations?

The entity you operate through changes where the profit shows up and whether any tax is withheld along the way, but the underlying obligation to pay tax during the year is the same in every case.

As a sole proprietor or single-member LLC, all profit is on Schedule C. No tax is withheld anywhere. You make estimated payments covering both income tax and self-employment tax on the full profit. This is the simplest structure for estimated taxes — one set of payments, one person, one return.

As an S-Corp owner, you're on payroll for your W-2 wages, and withholding from those paychecks covers the tax on the wage portion. But the distribution portion has no withholding, so you still need estimated payments to cover the income tax on that profit. If your distributions are small relative to your wages, your paycheck withholding might be enough to cover everything. If distributions are large, you'll need to either increase your W-2 withholding or make separate estimated payments. Our threshold: when net profit clears $80,000 to $100,000 and looks repeatable, it's time to run the S-Corp math — below that, the payroll and compliance costs eat the savings. More on that decision in our S-Corp income trigger post.

As a partner in a multi-member LLC, the partnership files Form 1065 and issues you a K-1. The partnership can make estimated payments on your behalf, but most small partnerships don't — each partner makes their own payments based on their K-1 share. If the partnership does make payments, they're credited to your account and reduce what you owe personally.

What records should I keep for quarterly tax payments?

Keep every confirmation number, bank statement showing the debit, and the dated Form 1040-ES vouchers if you mail checks. When you file your return, you'll total these payments on the estimated-tax line of your Form 1040, and the IRS matches them against their records. If a payment doesn't show up in their system — which happens occasionally with mailed checks — your confirmation is the proof you need to resolve it without a fight.

Run your bookkeeping on cash basis so your profit number matches what's actually in the bank. Reconciliation should happen monthly so your quarterly estimate is based on real numbers, not guesses. If your books are a mess, you'll either overpay (scared of underpaying) or underpay (flying blind). Our guide to cash vs accrual accounting for contractors walks through why cash basis is almost always the right choice for trades.

What's the simplest system to stay on track every quarter?

Open a separate savings account labeled "tax" and move your set-aside percentage into it every time you take a draw or deposit a client check. When the quarterly deadline arrives, the money is already there — you're not scrambling to pull together $8,000 from the operating account on April 14. Our standing rule is 25% to 30% of net income — 25% in no-income-tax states, 30% in California, 35% in an unusually profitable year — swept the day the money hits your account, not the day the deadline looms.

Set four recurring calendar reminders for the payment deadlines, two weeks ahead of each one. Use IRS Direct Pay and schedule the payment when you get the reminder — it takes five minutes. If you're using the prior-year safe harbor, the amount is the same every quarter, so after the first payment the rest are just a repeat. If your income is growing and you want to get ahead of a large April balance, add extra to the Q3 or Q4 payment once you see the year trending higher than last year.

If you want a second set of eyes on your quarterly plan — whether you're in your first year with no prior-year anchor, or you've elected S-Corp status and need to figure out the split between withholding and estimated payments — book a meeting with our office. We'll look at your actual numbers, set your safe-harbor target, and make sure the four payments are right before the first deadline hits.