When you work for an employer, taxes are simple: they take them out of your check, and you file a return in April. When you are self-employed, nothing is automatic. You owe taxes on your profit, you are responsible for making payments throughout the year, and you carry the full burden of payroll taxes that an employer would normally split with you. Understanding how self-employed taxes work — and how to legally reduce them — is one of the most valuable things you can do for your business finances.
The Two Taxes Self-Employed People Pay
Most self-employed people are surprised to discover they owe two separate taxes on their net business income:
1. Self-Employment (SE) Tax
Self-employment tax is the self-employed equivalent of FICA — Social Security and Medicare taxes. When you have a W-2 job, you pay 7.65% and your employer pays 7.65%, for a combined 15.3%. When you are self-employed, you pay both halves: the full 15.3% on your net self-employment income up to $176,100 (2025 Social Security wage base), then 2.9% on everything above that.
On $80,000 of net profit, that is approximately $11,304 in SE tax before any deductions. This is the tax that catches most new self-employed people off guard — they budget for income tax and forget SE tax entirely.
The one partial relief: you can deduct half of your SE tax on your income tax return (Schedule 1, Line 15). This does not reduce the SE tax itself, but it reduces the income subject to regular income tax.
2. Federal (and State) Income Tax
On top of SE tax, you owe federal income tax on your net profit at your marginal rate — the same tax brackets that apply to W-2 income. Net profit from your Schedule C flows directly onto your Form 1040 and gets taxed alongside any other income you or your spouse has.
If you live in Florida, you pay no state income tax — a significant advantage compared to states like California or New York where state income tax can add another 9–13% on top.
Quarterly Estimated Tax Payments
Because no employer is withholding taxes from your income, the IRS requires self-employed individuals to pay taxes throughout the year via quarterly estimated tax payments. These are due four times per year:
- Q1: April 15
- Q2: June 16
- Q3: September 15
- Q4: January 15 (of the following year)
If you do not pay enough throughout the year, the IRS charges an underpayment penalty — currently around 7–8% annualized on the shortfall. You are generally safe from the penalty if you pay at least 90% of the current year's tax liability, or 100% of the prior year's liability (110% if your AGI exceeds $150,000).
As a rough rule of thumb, setting aside 25–30% of net profit each quarter covers most self-employed people's combined SE tax and federal income tax liability. Read our detailed guide on how much to set aside for taxes for a more precise calculation based on your income level.
Deductions That Reduce Self-Employment Income
The good news: every legitimate business expense you deduct reduces both your income tax and your SE tax. The deduction comes off net profit — which is the base for both taxes. A $5,000 deduction at a 22% income tax rate plus 15.3% SE tax saves you roughly $1,865 in combined tax.
Key deductions for self-employed individuals:
- Home office deduction: The portion of your home exclusively used for business — either the simplified method ($5 per sq ft, up to 300 sq ft) or the regular method based on actual home expenses
- Vehicle expenses: Either the standard mileage rate (70 cents per mile in 2025) or actual vehicle expenses — requires a mileage log either way
- Health insurance premiums: Self-employed individuals can deduct 100% of health, dental, and vision insurance premiums paid for themselves and their family — directly on Schedule 1, not as an itemized deduction
- Retirement contributions: Contributions to a SEP-IRA (up to 25% of net self-employment income, max $70,000 in 2025) or Solo 401(k) reduce taxable income dollar for dollar
- Business equipment and software: Section 179 allows immediate expensing of business equipment rather than depreciating over several years
- Professional services: Bookkeeping, tax preparation, legal fees related to the business are fully deductible
- Business portion of phone and internet: The percentage used for business is deductible
The Single Biggest Tax Reduction Strategy: The S-Corp Election
Once your net self-employment income consistently exceeds $60,000–$80,000, the most significant legal tax reduction available is the S-Corp election. By electing S-Corp status for your LLC, you split your income into a W-2 salary (subject to payroll taxes) and distributions (not subject to SE tax).
On $120,000 of net income, paying yourself a $65,000 salary and taking $55,000 as a distribution can save $8,000–$10,000 in SE taxes annually — far exceeding the cost of the payroll administration the election requires. This strategy requires proper setup and a defensible reasonable salary; the IRS scrutinizes S-Corp arrangements where the salary is disproportionately low relative to the distributions.
The S-Corp election is not right for every situation or income level. A tax consulting session is the right starting point to run the numbers for your specific income, state, and business structure.
Retirement Accounts: Tax-Deferred Growth and Current-Year Deductions
Self-employed individuals have access to retirement accounts with contribution limits that far exceed what W-2 employees can contribute through a standard 401(k):
- SEP-IRA: Contribute up to 25% of net self-employment income, maximum $70,000 in 2025. Simple to set up, no annual filing requirement. Must contribute the same percentage for any employees.
- Solo 401(k): Employee contribution up to $23,500 plus employer profit-sharing contribution up to 25% of net SE income. Total limit $70,000. More complex but allows higher contributions at lower income levels than a SEP-IRA. Requires Form 5500-EZ once the plan exceeds $250,000 in assets.
- SIMPLE IRA: Available to businesses with 100 or fewer employees. Employee deferrals up to $16,500 plus employer match.
A maxed-out SEP-IRA or Solo 401(k) can eliminate a significant portion of your taxable income in high-revenue years. This is one of the most underutilized tax reduction tools among self-employed individuals.
Keeping Your Books Clean Is Non-Negotiable
Every deduction strategy above requires clean records to claim. The IRS does not accept reconstructed expenses, vague bank statements, or “I think I spent about X” as documentation. Without organized books, you end up paying more in taxes than you legally owe — or overstating deductions you cannot substantiate and running audit risk.
For most self-employed individuals, the combination of clean monthly bookkeeping and a tax professional who understands self-employment pays for itself many times over in deductions identified and taxes avoided. At Simple Books Now, Luisa N. Victoria is a Federally authorized Enrolled Agent who works with self-employed clients and small business owners to build tax strategies around their actual numbers — not generic advice.
If you are self-employed and not confident you are claiming every deduction available to you, reach out for a tax consulting session before your next quarterly payment is due.
