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How Much Tax Does a Self-Employed Construction Contractor Pay: Income Tax, SE Tax, and Withholding

Taxes are one of the biggest financial surprises for contractors who go independent for the first time. When you were an employee, taxes came out automatically. Now you're responsible for calculating and paying them yourself — quarterly. Understanding how the system works prevents unexpected bills and penalties.

The two main taxes you'll pay

1. Self-employment (SE) tax

This is the biggest tax surprise for new independent contractors. When you're employed, your employer pays half of Social Security and Medicare taxes (FICA) — you pay the other half. When you're self-employed, you pay both halves: 15.3% of your net self-employment income.

The breakdown: 12.4% Social Security (on earnings up to the annual cap, which is $168,600 in 2024) + 2.9% Medicare (no income cap) = 15.3% total.

The good news: you can deduct half of the SE tax from your gross income when calculating your federal income tax. This doesn't eliminate the SE tax, but it reduces your income tax.

2. Federal income tax

Your net profit from construction work (after business deductions) is added to any other income you have and taxed at the progressive federal rates:

Taxable income (single filer, 2024)	Tax rate
$0 – $11,600	10%
$11,600 – $47,150	12%
$47,150 – $100,525	22%
$100,525 – $191,950	24%
$191,950 – $243,725	32%
Over $243,725	35–37%

Married filing jointly thresholds are roughly double. The rates are marginal — each bracket only applies to income within that range, not to all your income.

3. State income tax

Varies significantly by state:

No state income tax: Florida, Texas, Nevada, Washington, Wyoming, South Dakota, Alaska.
Low (under 5%): several states.
High (5–13%): California (up to 13.3%), New York, New Jersey, Oregon.

For contractors in high-tax states, state income tax can add 5–10% to the total effective tax rate on business income.

Quarterly estimated taxes: the system you must use

Since no employer withholds taxes from your contractor payments, you must pay taxes yourself four times per year via estimated tax payments.

Payment schedule:

Q1 (Jan–Mar): due April 15
Q2 (Apr–May): due June 17
Q3 (Jun–Aug): due September 16
Q4 (Sep–Dec): due January 15 of next year

How to pay: IRS Direct Pay at IRS.gov/payments or EFTPS (Electronic Federal Tax Payment System). Most states have a similar online system.

How much to pay: the IRS won't penalize you if you pay at least:

100% of last year's total tax liability, or
90% of the current year's actual tax liability.

Easiest approach for new contractors: pay 25-30% of every invoice received into a dedicated tax savings account, then pay quarterly from that account. This is rarely exactly right but keeps you in the safe range.

What your effective tax rate actually looks like

Let's work through a realistic example for a remodeling contractor:

Annual gross revenue: $85,000 Business expenses (materials, vehicle 50%, tools, insurance, phone 50%, accounting): $35,000 Net profit from business: $50,000

Self-employment tax: 15.3% × $50,000 × 92.35% (SE tax adjustment) = ~$7,065 SE tax deduction: half of SE tax = $3,532

Adjusted gross income: $50,000 – $3,532 = $46,468 Standard deduction (2024, single): $14,600 Taxable income: $31,868

Federal income tax on $31,868:

10% on first $11,600 = $1,160
12% on $11,600–$31,868 = $2,432
Total federal income tax: ~$3,592

Total taxes: $7,065 SE tax + $3,592 federal income tax = ~$10,657

Effective total federal tax rate on $85,000 gross: ~12.5%. It feels larger because it comes out of your net profit, not your revenue.

The QBI deduction: a significant tax break for contractors

The Qualified Business Income (QBI) deduction (Section 199A) lets most self-employed contractors deduct up to 20% of their qualified business income from taxable income. For a net profit of $50,000, that could be a $10,000 deduction.

There are income limits and phase-outs. Most contractors with income below $200,000 (single) qualify for the full 20% deduction. This is one of the most valuable tax breaks available to self-employed workers — make sure your accountant applies it.

Withholding from clients: when it happens

Most residential remodeling work with homeowners does not involve withholding. However, if you work as a subcontractor for a general contractor or a business entity, backup withholding can apply if you haven't provided a proper W-9, or certain backup withholding situations exist.

If a payer withholds money from your payment, they'll provide a 1099-NEC at year-end showing what was paid and any federal income tax withheld. That withheld amount gets credited against your total tax liability on your annual return.

Annual filing: Form 1040 + Schedule C

Each year you file:

Schedule C: business income and expenses.
Schedule SE: calculation of self-employment tax.
Form 1040: your complete personal tax return.

If you made quarterly estimated payments, they're credited against your total liability. The result is either a balance due (pay by April 15) or a refund.

The one-page summary

Tax	Rate	When paid
Self-employment tax	15.3% of net earnings	Quarterly estimated + annual return
Federal income tax	10–37% (marginal)	Quarterly estimated + annual return
State income tax	0–13%+	Quarterly + annual (varies by state)

Reserve 25–30% of all income received for taxes. Pay quarterly. Keep clean records of all expenses.

How Presupix keeps you organized

Presupix invoices generate a complete record of your revenue for the year — by project, by date, by amount. When it's time to sit down with your accountant or fill out Schedule C yourself, you have the income side already documented. Combine that with your expense records and you're ready.