The Edition
C2C vs. W-2 vs. 1099 for engineers: the tax math, the trade-offs, and how to pick
This is general education on engagement models, not tax advice. The numbers below illustrate the structure; your specific return depends on your state, deductions, and accountant. Talk to a CPA before you file or before you switch engagement models.
If you’ve ever taken a contract engineering role, someone — probably a recruiter — has asked whether you want it on W-2, 1099, or C2C. Many engineers pick whichever the firm steers them toward, then discover months later that they could have taken home thousands of dollars more (or less) by picking differently.
This piece walks through what each model actually costs in taxes, who each one is for, and the specific math that decides between them. We’ll use real numbers throughout — not because your situation is exactly like our example, but because the structure of the math is the same regardless of your rate.
The short version, if you only read this far:
- W-2 is the simplest. Lowest take-home rate, but no business setup, no quarterly taxes, and the staffing firm absorbs payroll-tax liability. Right answer if you don’t want to think about it.
- 1099 is rare in engineering for a reason. The IRS reclassification risk is real, the self-employment tax is brutal, and several states (CA, NJ, MA, IL) make it nearly impossible to do legitimately for full-time contract work. Avoid unless you genuinely run multiple short engagements.
- C2C with an S-Corp election is the highest take-home model — typically 5-15% more than W-2 at the same bill rate — but only after you’ve cleared roughly $40-60K in net business income, and only if you’re willing to run the LLC like a real business.
The rest of this piece shows you why.
The three models, mechanically
W-2 (employee of the staffing firm)
You’re an employee of the staffing firm. They invoice the client; the client pays them; they pay you a paycheck after withholding.
What the staffing firm does on your behalf:
- Withholds federal and state income tax
- Withholds your half of FICA (Social Security 6.2% + Medicare 1.45% = 7.65%)
- Pays the employer half of FICA (another 7.65%) out of the bill rate
- Pays federal and state unemployment tax (FUTA + SUTA)
- Carries workers’ compensation insurance
- Often offers health insurance, sometimes 401(k) (varies — many staffing firms offer thin or no benefits)
- Issues a W-2 at year end
What you do: Show up, do the work, file a normal W-2 tax return.
1099 (independent contractor)
You’re not anyone’s employee. The staffing firm pays you the full bill rate; nothing is withheld. At year-end, they send you (and the IRS) a 1099-NEC showing what they paid.
What you owe:
- Federal income tax (paid via quarterly estimated taxes)
- State income tax (also quarterly)
- Self-employment tax: 15.3% on net earnings up to ~$168,600 (2024 Social Security wage base; 2026 cap is around $176K — verify with current IRS thresholds), and 2.9% Medicare on everything above that, plus an extra 0.9% Medicare on income above $200K single / $250K married
- No employer-paid benefits, no workers’ comp, no PTO
Why it’s brutal: Self-employment tax is the full 15.3% — both halves of FICA — because there’s no employer to split it with. On a $200K gross, that’s roughly $26K right off the top, before income tax.
C2C (Corp-to-Corp)
You form a business entity (almost always a single-member LLC, often with an S-Corp tax election once profitable). The staffing firm pays your LLC. Your LLC pays you.
Two flavors:
a) C2C with default LLC tax treatment (pass-through): The IRS treats your single-member LLC as a “disregarded entity” — taxes flow through to your personal return as if you were a 1099. Same self-employment-tax problem.
b) C2C with S-Corp election (the actual win): You file IRS Form 2553 to have the LLC taxed as an S-Corporation. Now you split income two ways:
- A “reasonable salary” to yourself (W-2 from your own LLC) — this part is subject to FICA (you pay both halves, ~15.3%)
- The remainder as distributions — this part is NOT subject to FICA, only to income tax
The S-Corp split is the only legal way to reduce self-employment tax materially. The “reasonable salary” part is required by the IRS — you can’t pay yourself $1 in salary and $200K in distributions. Most accountants benchmark the salary at 40-60% of total compensation for engineering roles, depending on stack and seniority.
The math: same engineer, same role, three engagement models
Let’s say you’re a Senior Backend Engineer with five years of experience, working a full-year contract at the same client. The client is paying the same total dollars to the staffing firm regardless of how the firm pays you. The firm needs roughly the same gross margin (~25-30%) regardless of model — so what you see as the headline rate changes by model.
Assumed:
- Client pays staffing firm: $140/hr (the “client bill rate”)
- 2,080 hours/year (40 hr × 52 weeks; ignoring PTO/holidays for the round numbers)
- The engineer lives in Texas (no state income tax). We’ll mention what changes for high-tax states.
- 2026 federal tax brackets (rough; verify against current IRS schedules)
We compare what you take home in each model. The staffing firm’s gross margin is roughly the same across all three because their total cost (your pay + their employer-side payroll burden) ends up similar — only the split between “your check” and “burden costs” differs.
Model 1: W-2 at $80/hr
The firm pays you $80/hr W-2. The remaining $60 of the $140 client bill covers their employer-side payroll burden (FICA employer portion, workers’ comp, FUTA/SUTA, optional benefits, recruiter commission, profit margin).
| Item | Amount |
|---|---|
| Gross W-2 wages | $80 × 2,080 = $166,400 |
| Employee FICA (7.65%) | -$12,729 |
| Federal income tax (single, 2026 brackets, standard deduction) | ~$28,500 |
| State income tax (Texas) | $0 |
| Take-home | ~$125,170 |
| Net take-home as % of gross | ~75% |
If you’re in California (top marginal ~13.3%): subtract another ~$15K. Take-home: ~$110K.
Model 2: 1099 at $95/hr
The firm pays you the full $95/hr; nothing withheld. They keep the rest of the $140 bill rate. The premium over W-2 is meant to compensate you for the employer-side payroll taxes you now eat yourself.
| Item | Amount |
|---|---|
| Gross 1099 income | $95 × 2,080 = $197,600 |
| Self-employment tax (15.3% on first $168,600 + 2.9% on rest = $25,996 + $841 + 0.9% above $200K=0) | ~$26,837 |
| Half of SE tax deductible above the line | -$13,418 deduction → reduces taxable income |
| Business deductions (laptop, home office, etc., realistic) | ~$8,000 |
| Adjusted gross income | $197,600 - $13,418 - $8,000 = $176,182 |
| Federal income tax on AGI (single, 2026 brackets) | ~$32,000 |
| State income tax (Texas) | $0 |
| Take-home | ~$197,600 - $26,837 - $32,000 = ~$138,763 |
| Net as % of gross | ~70% |
Better than W-2 by roughly $13,500. But you bought your own equipment, you have no PTO, no health insurance subsidy, no 401(k) match, no workers’ comp. If you take two weeks unpaid to recover from a back injury, you eat $7,600.
The bigger problem with 1099: the IRS often disagrees that you’re actually an independent contractor. If the staffing firm tells you when to work, what to work on, gives you a laptop, requires you to attend their meetings, and you work for them full-time, the IRS will likely classify the relationship as employer/employee under the common-law test or DOL’s economic reality test. If they reclassify you, the staffing firm pays back-taxes and penalties; you may owe additional tax on previously-untaxed-as-employee income. It happens.
State-by-state 1099 reality:
- California (AB5): the ABC test makes 1099 classification almost impossible for full-time contract work. The B-prong (“worker performs work outside the usual course of the hiring entity’s business”) is fatal: a staffing firm placing engineers as 1099s can’t credibly argue their core business is something other than placing engineers.
- New Jersey, Massachusetts, Illinois: similar ABC-test rules. Avoid 1099 in these states.
- Texas, Florida, most other states: standard IRS common-law test. Tighter than people assume but workable for genuinely independent engineers.
This is why most legitimate staffing firms don’t offer 1099 for long-term contract roles. We don’t either, except in very specific situations (short engagements, multi-client genuine independents).
Model 3: C2C with S-Corp election at $105/hr
You have an LLC with an S-Corp tax election. The firm pays your LLC $105/hr. The premium over W-2 reflects that the firm doesn’t pay employer-side payroll taxes for you (you’re not their employee) and doesn’t carry your workers’ comp insurance.
| Item | Amount |
|---|---|
| Gross paid to your LLC | $105 × 2,080 = $218,400 |
| LLC operating costs (registered agent, accountant, business banking, software) | ~$3,000 |
| Net business income | ~$215,400 |
| You take this as: “Reasonable salary” $90,000 + S-Corp distribution $125,400 | |
| Salary FICA (employer + employee, paid by the LLC) | $90,000 × 15.3% = $13,770 |
| Federal income tax on $90K salary + $125,400 distribution + $0 W-2 deductions | ~$48,000 |
| State income tax (Texas) | $0 |
| Take-home | ~$215,400 - $13,770 - $48,000 = ~$153,630 |
| Net as % of gross | ~70% |
Better than W-2 by ~$28,500. Better than 1099 by ~$15,000. The S-Corp savings are real.
Why C2C with S-Corp wins: the $125,400 distribution component is NOT subject to the 15.3% self-employment tax. On 1099, that same amount would have cost you ~$19K in additional SE tax. That’s the entire savings.
The catch: the S-Corp election only makes sense once you have meaningful net business income. Below ~$40-50K profit, the LLC overhead (registered agent, accountant, separate bank account, payroll software, quarterly filings) eats the savings. Above ~$60K, the S-Corp election typically saves $5K-$15K per year. At full-time engineering rates, you’re well above that threshold.
Side-by-side summary
| Model | Bill rate | Gross to engineer | Take-home (TX) | Take-home (CA) | Setup |
|---|---|---|---|---|---|
| W-2 at $80/hr | $140 | $166,400 | ~$125K | ~$110K | None — easiest |
| 1099 at $95/hr | $140 | $197,600 | ~$139K | ~$120K | Quarterly taxes; classification risk |
| C2C + S-Corp at $105/hr | $140 | $215,400 | ~$154K | ~$135K | LLC + S-Corp election + accountant |
Same client bill rate. Different take-home by roughly $30K depending on engagement model.
So why doesn’t every engineer just go C2C with an S-Corp?
Because the C2C path has real costs that the simple math hides.
Setup costs:
- LLC formation: $300-$800 in your state (Texas LLC is $300; California LLC is $70 filing + $800/yr franchise tax)
- Registered agent: $50-$300/yr if not using your home address
- Business bank account: free at most online banks (Mercury, Relay)
- Accountant for S-Corp setup + quarterly filings: $1,000-$2,500/yr
- Payroll software (Gusto for the W-2-to-yourself part): $40-80/mo
- Time to learn how to run the entity: ~10-20 hours
Compliance costs:
- File quarterly federal estimated taxes (Form 1040-ES)
- File state quarterly estimated taxes
- File LLC’s annual federal Form 1120-S (S-Corp return)
- File Schedule K-1 to yourself
- File state LLC annual reports (varies by state)
- Run W-2 payroll for yourself monthly or quarterly
- Track business expenses separately from personal
Risk costs:
- IRS scrutiny is higher on S-Corps. Reasonable-salary determinations are subjective.
- If the client or staffing firm requires W-2 (some VMS programs do), your LLC can’t take the gig.
- Some clients are bureaucratic enough to refuse C2C entirely and only work with W-2.
When C2C makes sense:
- You’re committed to running it like a real business for at least 2-3 years (LLC + S-Corp doesn’t pay back at 6-month timelines)
- Your annual compensation will reliably clear $150K (S-Corp savings need scale)
- You’ll likely have multiple engagements (LLC supports rotating between clients without re-setup)
- You’re comfortable with quarterly tax filings or you have an accountant who is
When W-2 makes sense:
- You want simplicity above all
- Your role might convert to full-time (W-2 is much easier to convert from)
- You’re risk-averse about IRS classification
- Health insurance through the staffing firm is competitive
When 1099 makes sense:
- You have multiple genuinely independent clients (not one staffing firm full-time)
- You’re in a state where the classification test isn’t ABC
- The engagement is short (3 months or less)
- For most engineering work, none of the above usually applies, which is why we don’t recommend 1099 for full-time contract roles
The single most-overlooked variable: state classification rules
If you’re going to remember one thing from this piece: where you physically work matters more than where the staffing firm is.
If you’re a 1099 contractor on a remote engagement, but you live in California, AB5’s ABC test applies to your work. The fact that the staffing firm is in Texas doesn’t help you. If the IRS or California’s EDD audits and reclassifies, the firm owes back-taxes for the period you should have been a W-2 employee, and you may owe additional tax on income that should have been reported as wages.
For C2C, similar rules apply but they’re applied to your LLC’s status, not to you personally. If your LLC contracts with a Texas staffing firm but you (as an individual) live and work in California, California still wants its income tax, and the LLC may have nexus in California (which can require a separate California LLC registration and franchise tax).
The honest version for engineers in CA, NJ, MA, IL: stick with W-2 for staffing-firm engagements unless you have a strong reason and an accountant who knows your state. The math savings from C2C/1099 don’t survive the compliance complexity.
How to pick, in 60 seconds
Three questions:
1. Is your annual contract income reliably above $150K?
- No → W-2 (the savings from C2C don’t justify the overhead)
- Yes → continue
2. Are you in CA, NJ, MA, or IL?
- Yes → W-2 unless you have an accountant explicitly green-lighting otherwise
- No → continue
3. Are you willing to run an LLC like a real business for 2+ years?
- No → W-2 (C2C without commitment becomes a tax mess)
- Yes → C2C with S-Corp election is probably your best take-home option
If you got to “C2C” via this flowchart, you’re not done — talk to a CPA. The $1,500 you’ll spend on a good accountant in year one is the highest-ROI dollar you’ll spend as a contractor.
What we do at Edition Technologies
We run all three models. When a client wants a contractor on W-2, we make it W-2. When a candidate has an LLC and prefers C2C, we make it C2C (in states where the rules permit). When the engagement is genuinely short and the candidate is genuinely independent, 1099 can work.
What we don’t do is steer you toward whichever model is cheapest for us. If you ask why a particular role is W-2 only, we’ll tell you the actual reason — usually the client’s VMS program requires it, or the state’s classification rules don’t permit C2C, or our parent vendor requires W-2. That’s the conversation, not a sales pitch.
If you’re an engineer and you’ve ever felt like the engagement model was decided for you without explanation, that’s worth pushing back on. Ask the firm:
- “What’s the bill rate, and what’s the difference between W-2 and C2C bill rates here?”
- “Why isn’t this engagement available as C2C?”
- “What’s your gross margin on this role?”
A good staffing firm will answer all three. A bad one will deflect.
This piece is part of The Edition, a monthly newsletter on engineering hiring from Edition Technologies — a US-wide engineering placement firm based in Austin. If you’re an engineer thinking about your next role, join our talent network. If you’re hiring engineers and want a different kind of conversation, start one here. Already have an offer and need a payroll vehicle? See Edition Payrolling.
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