One of the most financially dangerous moments in a contractor’s life is the first time they receive a large tax bill they didn’t see coming. Self-employment is financially rewarding — but nobody withholds taxes from your checks. You’re responsible for estimating your tax liability and setting aside money throughout the year. Fail to do this, and April brings a bill you can’t pay. This guide tells you exactly how much to set aside for taxes as a California contractor — and how to make sure the money is there when you need it.
Why Contractors Pay More in Taxes Than Employees
When you work for someone else, your employer withholds income taxes and pays half of your Social Security and Medicare (FICA) taxes. When you’re self-employed, you pay both the employee and employer shares of FICA — a combined 15.3% on net self-employment income up to $160,200 (2023), then 2.9% above that. On top of self-employment tax, you pay federal income tax and California state income tax on your net profit. The total effective tax rate for a profitable sole proprietor in California can easily be 35–45% of net profit.
The 30–35% Rule of Thumb
A good starting point for most California contractors is to set aside 30–35% of every payment received for taxes. This covers federal self-employment tax (15.3% on most of your net income), federal income tax (22–24% marginal rate for many small business income levels), and California state income tax (9.3% marginal rate for income over $66,295 in 2023). At 30%, you’re likely slightly under-saving for higher income levels — bump to 35% if you’re consistently profitable at $150,000+ in net income, or if you’ve owed large balances in prior years. At 30%, you’re comfortable for most contractors earning $50,000–$150,000 in net profit.
Set Aside from Gross Revenue, Not Net Profit
Set aside a percentage of every payment you receive, not your estimated net profit. This is simpler and safer. If you receive $10,000 from a client, move $3,000–$3,500 to your tax savings account immediately. You don’t need to know your exact profit from that job to set aside a consistent percentage. The total amount you set aside throughout the year will be close to (or slightly more than) what you owe — and any overage becomes a tax refund or estimated payment credit.
Quarterly Estimated Tax Payments
The IRS and California FTB require self-employed individuals and business owners to make quarterly estimated tax payments if they expect to owe $1,000 or more in federal taxes for the year. Missing or underpaying estimated taxes triggers underpayment penalties. Federal due dates are April 15, June 15, September 15, and January 15. California FTB due dates are slightly different: April 15, June 15, September 15, and January 15 (same as federal). From the tax savings account you’ve been filling each month, send your quarterly estimated payments on time. Your CPA or bookkeeper can calculate the appropriate amounts each quarter based on your actual income and deductions to date.
How the S-Corp Can Reduce Your Tax Set-Aside
One of the primary benefits of electing S-Corp tax status is reducing the amount of income subject to self-employment taxes. As an S-Corp, only your reasonable salary is subject to payroll taxes — not distributions. This can meaningfully reduce your effective tax rate and therefore the percentage you need to set aside. A contractor who nets $200,000 and takes a $90,000 S-Corp salary is only paying payroll taxes on $90,000 instead of $200,000 — saving roughly $16,000 in self-employment taxes. This effectively lowers your combined tax rate and improves cash flow throughout the year.
Building a Tax Savings System
Open a dedicated, separate bank account labeled “Tax Savings” — not your general savings account, not your operating account. Every time you receive a payment from a client, immediately transfer your 30–35% to the tax savings account. Make this automatic if your bank allows it. Never spend from this account for operating expenses. Treat this account as untouchable until your quarterly estimated tax payments are due. With this simple system, you’ll always have your taxes covered and you’ll never have an April surprise again.
Frequently Asked Questions
What if I’ve already spent my tax money?
If you’ve already spent money you should have saved for taxes, pay what you can by the tax deadline and set up an IRS installment agreement for the remainder. The IRS generally accepts installment agreements for amounts up to $50,000. California FTB has similar programs. Interest and penalties accrue on unpaid balances, so paying as much as possible upfront minimizes the total cost. Going forward, implement the tax savings account system immediately to prevent this from happening again.
Can I reduce what I need to set aside with deductions?
Yes. Every legitimate business deduction reduces your taxable income, which reduces your tax liability. Maximizing deductions (vehicles, equipment, home office, retirement contributions) can significantly reduce the effective amount you owe. Work with a CPA and bookkeeper who know contractor deductions to ensure you’re capturing everything. But don’t count on deductions to save you from taxes you haven’t set aside — set aside 30–35% first, then deductions will create a tax refund or credit rather than determining whether you can pay your bill.
For more information, see our guide on tax deductions for California contractors.
For more information, see our guide on prepare for a business tax audit.
For more information, see our guide on IRS red flags that trigger audits.
For more information, see our guide on choosing the right business structure.
Bookkeeping Champs Helps You Stay Ahead of Taxes
Bookkeeping Champs provides quarterly tax planning for contractors throughout Los Angeles and Ventura County — helping you set aside the right amount, make timely estimated payments, and maximize deductions so you never face an unexpected tax bill. Call (818) 679-4451 today.
Leave a Reply