Working Schedule
Non-Billable Time
Admin time covers marketing, invoicing, bookkeeping, and business development. The 2026 SE tax rate is 15.3% (12.4% Social Security + 2.9% Medicare).
Annual Income Breakdown
Enter your day rate and schedule and click calculate.
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Introduction
Contractors who price themselves by the day often miss the single most expensive line item in their business: the days they are not working. According to HMRC's IR35 and contractor guidance, UK contractors average only 220 billable days per year after accounting for holidays, sick days, between-contract gaps, and business development time. In the US, self-employed workers lose another 15.3% of gross income to self-employment tax before a single business expense. A day rate that looks equivalent to a salaried package rarely is. This calculator converts your daily contract rate into a true annualised income figure by accounting for actual working days, vacation, gaps between contracts, self-employment tax, business expenses, and benefits you must self-fund. It gives you a net income number, not a gross one, so you can make an honest comparison to any salaried role.
What This Calculator Does
This day rate to annual income calculator converts a daily contractor or freelance rate into a realistic net annual income. Enter your day rate, the number of billable days per week, weeks worked per year (after holidays and gaps), self-employment or income tax rate, annual business expenses, and benefits costs you self-fund (health insurance, retirement). The calculator returns gross annual income, pre-tax profit after expenses, estimated tax liability, and true net annual income. It also shows the equivalent salaried gross needed to match your net contractor income.
The Formula
Billable days per year equals weekly days multiplied by working weeks (typically 46 to 48 weeks for contractors allowing for gaps and holidays). Annual gross is the product of day rate and billable days. Business expenses (software, equipment, insurance, professional fees) are deducted to arrive at taxable profit. Self-employment tax (15.3% in the US on 92.35% of net earnings) and income tax are applied to taxable profit. Benefits costs paid out of pocket, such as health insurance and retirement contributions, are deducted from the after-tax figure to arrive at true net income.
Step-by-Step Example
Enter your day rate
Input your current or target daily rate. Example: $650/day. If you charge hourly, multiply by the hours you bill per day (typically 7 to 8 hours).
Set billable days
Enter weekly billable days (typically 5) and working weeks per year. Allow for 4 weeks of holiday, 1 week of sick time, and 2 to 4 weeks of between-contract gaps. A realistic figure is 44 to 47 working weeks, yielding 220 to 235 billable days.
Add expenses and benefits
Enter annual business expenses. Example: $8,000 for software, equipment, professional development, accounting fees, and insurance. Add self-funded benefits: health insurance ($7,200/year individual, $21,000 family) and retirement contributions.
Review net income and salary equivalent
At $650/day x 230 days = $149,500 gross. After $8,000 expenses, SE tax ($19,550), income tax ($28,500), and $7,200 health insurance, net income is approximately $86,250. The equivalent salaried gross needed to produce the same net (with employer-paid benefits) is approximately $105,000.
Real-World Use Cases
Contract-vs-Salary Decision
A developer offered a $600/day contract alongside a $110,000 salaried role with full benefits runs both through the calculator. At 230 billable days and self-funded health insurance, the contract nets $78,000 versus $78,400 salary net. The salaried role is marginally better on net, but the contract offers more flexibility, making it a true trade-off rather than an obvious winner.
Day Rate Negotiation
A consultant targeting $95,000 net income works backward: accounting for 225 billable days, SE tax, $10,000 expenses, and $8,000 in self-funded benefits, the required gross is $162,500, meaning the minimum viable day rate is $722. They can use this floor to negotiate confidently.
Annual Income Planning
A freelancer who took on multiple short contracts last year uses the calculator to model the full-year impact of adding one extra day per week of billable work. Going from 3 to 4 billable days at $500/day adds approximately $22,000 gross and $13,500 net per year.
Comparison
| Day Rate | Billable Days | Gross Annual | After SE Tax & Expenses | Net (incl. benefits) |
|---|---|---|---|---|
| $400/day | 220 | $88,000 | $63,500 | $54,300 |
| $500/day | 220 | $110,000 | $79,800 | $70,600 |
| $600/day | 230 | $138,000 | $100,100 | $90,900 |
| $700/day | 230 | $161,000 | $116,700 | $107,500 |
| $800/day | 235 | $188,000 | $136,300 | $127,100 |
Common Mistakes to Avoid
Treating gross day rate income as equivalent to a gross salary. A $700/day contractor and a $145,000 salaried employee do not take home the same amount. The contractor pays both sides of payroll tax, self-funds benefits, and absorbs unpaid gaps.
Using 260 working days as the billable day assumption. After public holidays (11 in the US), vacation (10 to 20 days), sick leave, and between-contract gaps, most contractors bill 210 to 240 days realistically.
Ignoring self-employment tax. US self-employed workers pay 15.3% SE tax on 92.35% of net earnings before income tax. On $100,000 net profit, that is $14,130 in SE tax alone.
Not factoring in pension contributions. Salaried employees typically receive 3% to 6% employer retirement matching. Contractors must fund their own, reducing spendable net income further.
Frequently Asked Questions
Accuracy and Disclaimer
This calculator provides estimates for financial planning purposes. Actual tax liability depends on your jurisdiction, filing status, deductions, and applicable tax treaties. Self-employment tax rules vary by country. Consult a licensed accountant or tax professional for personalised income and tax planning advice.
Conclusion
Run the numbers before accepting or quoting a day rate. A $700/day contract that generates 200 billable days yields $140,000 gross but may net under $90,000 after self-employment tax, health insurance, pension contributions, and gaps. If you are comparing this to a $95,000 salaried role with benefits, the salaried role may be worth more. Once you have your net figure, use the Consulting Rate Calculator to sanity-check whether your rate covers your actual floor, or the Hourly Rate Calculator to convert in the other direction.
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