Self-Employed Taxes in California (1099 Guide)
Federal, state and self-employment tax for California freelancers — and the deductions that cut all three
If you're a freelancer, gig worker or 1099 contractor in California, no one is withholding tax for you — which means you are, in effect, your own payroll department. And in the state with the highest income tax in the country, the cost of getting it wrong is higher than almost anywhere else. The flip side: every deduction you capture works harder here.
This guide breaks your taxes into the three layers every California freelancer pays, then the deductions that cut across all of them.
General information only, not personal tax advice. Rates and thresholds change — verify with the IRS (irs.gov), the California Franchise Tax Board (ftb.ca.gov), or a licensed tax professional.
The three layers you actually pay
Self-employed Californians face tax on three fronts. Understanding them separately makes the whole thing manageable:
- Federal income tax — at the usual federal brackets, on your net profit.
- Self-employment (SE) tax — 15.3% (Social Security + Medicare) on your net self-employment earnings. This is the one that shocks new freelancers, because an employee only pays half (the employer pays the rest); you pay both halves.
- California state income tax — California uses progressive brackets that top out higher than any other state (verify the current top rate and brackets).
Step 1 — Report your business on Schedule C
Your freelance income and expenses go on Schedule C (Profit or Loss from Business). Your net profit (income minus deductible expenses) is what flows into both income tax and SE tax — which is exactly why deductions are so powerful: they reduce all of it.
Step 2 — Calculate self-employment tax on Schedule SE
SE tax of 15.3% applies to your net earnings. Two pieces of good news: you can deduct half of your SE tax against your income tax, and the Social Security portion only applies up to an annual wage-base cap (verify the current cap).
Step 3 — Pay quarterly estimated taxes (don't skip this)
Because no employer withholds for you, the IRS and California expect quarterly estimated payments (federal Form 1040-ES; California has its own). Miss them and you can owe underpayment penalties even if you pay in full at year-end. The federal due dates fall roughly in April, June, September and January (verify exact dates each year). This is the single most common, most expensive mistake new freelancers make.
Step 4 — File your annual returns
Federal return (with Schedule C and SE) plus your California return. If you operate as an LLC, note California's annual LLC tax/fee may apply — check the FTB.
The deductions that move the needle
Every dollar of legitimate deduction reduces federal income tax, SE tax and California tax. The big ones:
- Mileage / vehicle — the standard mileage rate per business mile (verify the current ¢/mile) or actual costs. Track every business mile.
- Home office — the simplified method ($/sq ft up to 300 sq ft) or actual-expense method.
- Phone, internet & software — the business-use portion.
- Equipment — Section 179 / bonus depreciation can let you expense big purchases up front.
- Self-employed health insurance — premiums may be deductible above the line.
- Qualified Business Income (QBI) deduction — up to 20% of qualified business income, subject to income thresholds.
- Retirement — SEP-IRA or solo 401(k) contributions reduce taxable income while building your future.
- Plus the everyday: supplies, professional fees, advertising, business meals (partial), education.
Worked example: a Los Angeles freelancer
Dana earns $90,000 freelancing and has $15,000 of legitimate business expenses, leaving $75,000 net profit.
- SE tax: roughly 15.3% on net earnings (with the standard adjustment) — a substantial figure, half of which she deducts.
- Federal income tax: on her net profit after the SE-tax-half and QBI deductions.
- California income tax: on top, at CA's progressive rates.
The lesson isn't the exact dollars (verify with current rates) — it's that her $15,000 of expenses cut all three taxes at once, and that splitting her bill into four quarterly payments avoided penalties and a brutal April. The freelancer beside her who didn't track expenses or pay quarterly paid more tax and a penalty on top.
How TaxBot helps California freelancers
TaxBot scans your receipts and sorts them into Schedule C categories automatically, tracks your business mileage, and keeps a running picture of your net profit — so you know what to set aside for each quarterly payment and never miss a deduction that could cut your federal, SE and California tax together.