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Calculating Freelancer Invoices
As a freelancer, getting your invoices right is critical — it’s how you get paid. Whether you bill hourly or per project, understanding how to calculate totals with tax ensures you charge accurately and maintain professional relationships with clients.
The Hourly Invoice Formula
For time-based billing, the formula is simple:
Subtotal = Hourly Rate × Hours Worked
Tax = Subtotal × (Tax Rate / 100)
Total = Subtotal + Tax
Example: Web Development Project
You charge $85/hour and worked 32 hours with a 10% sales tax:
Subtotal = 85 × 32 = $2,720.00
Tax = 2,720 × 0.10 = $272.00
Total = 2,720 + 272 = $2,992.00
Setting Your Hourly Rate
To determine a fair hourly rate, consider:
- Target annual income: How much you want to earn
- Billable hours: Typically 60-70% of your work time is billable
- Expenses: Software, equipment, insurance, taxes
Desired salary = $80,000
Billable hours/year = 1,200 (about 25 hours/week)
Expenses/year = $10,000
Self-employment tax = 15%
Rate = ($80,000 + $10,000) / (1 - 0.15) / 1,200
Rate = $105,882 / 1,200
Rate ≈ $88/hour
Common Freelance Tax Rates
Tax obligations vary by location, but common rates include:
| Type | Typical Rate |
|---|---|
| US Self-Employment Tax | 15.3% |
| VAT (EU) | 19-25% |
| GST (Australia) | 10% |
| HST (Canada) | 13-15% |
Tips for Better Invoicing
- Track time accurately: Use time tracking tools and round to the nearest 15 minutes
- Include payment terms: Net 15 or Net 30 days
- Itemize services: Break down hours by task type
- Add late payment fees: Typically 1-2% per month
Free Invoice Calculator
Calculate your freelance invoice total with tax.
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Example
$75/hour × 40 hours with 8% tax:
Subtotal = 75 × 40 = $3,000.00
Tax = 3,000 × 0.08 = $240.00
Total = $3,240.00
Frequently Asked Questions
How do I calculate my freelance hourly rate?
Start with your desired annual income, add business expenses, account for self-employment taxes (typically 15.3% in the US), then divide by the number of billable hours you expect per year. Most freelancers bill around 1,000 to 1,200 hours annually, which accounts for non-billable time like marketing and administration.
Should I charge hourly or per project?
Both have advantages. Hourly billing is simpler and protects against scope creep. Project-based pricing rewards efficiency and can be more profitable. Many experienced freelancers use project-based pricing once they can accurately estimate the time required.
What should I include on a freelance invoice?
Include your name and contact details, the client’s information, a unique invoice number, itemized list of services with hours and rates, subtotal, applicable taxes, total due, payment terms (Net 15 or Net 30), and your preferred payment method.
Need to calculate profit margins on your freelance projects? Try our profit margin calculator. For understanding how your savings grow over time, check the compound interest calculator.
Calculate Invoices in Notes Calculator
Notes Calculator’s variables, percentages, and total function make it a natural fit for freelance invoicing:
# Client: Acme Corp — February 2026
hourly rate = $85
// Week 1
Design work: 12 hours
Development: 20 hours
hours worked = 12 + 20
subtotal = hourly rate * hours worked
// Tax & total
tax rate = 10%
tax = subtotal * tax rate
total = subtotal + tax
Use tabs to keep one tab per client, and headings (#) to separate months or projects. The total keyword sums all consecutive numbers above it — perfect for adding up line items. Notes Calculator also supports currency symbols and converts between 100+ currencies, so you can type $2720 in € to quote international clients.
See how it compares to spreadsheets in our notepad calculator vs spreadsheet guide.