Side Project Revenue Calculator
A side project must earn more than your time is worth to be financially rational. This calculator finds your effective hourly rate, net after-tax income, and compares it to your primary employment hourly rate so you can decide whether your side hustle deserves the time investment. Enter your gross revenue, direct costs, hours worked, and your income tax rate to see the full picture.
Side project net income formula
Net Earnings = Gross Revenue - Direct Costs
SE Tax = Net Earnings x 0.9235 x 0.153
SE Tax Deduction = SE Tax / 2
Taxable Income = Net Earnings - SE Tax Deduction
Income Tax = Taxable Income x Income Tax Rate
Net After Tax = Net Earnings - SE Tax - Income Tax
Annual Hours = Hours/Week x 52
Effective Hourly Rate = Net After Tax / Annual Hours
SE tax is calculated per IRS Schedule SE: 15.3% applies to 92.35% of net self-employment earnings. You may deduct one-half of SE tax from gross income before calculating income tax, per IRC Section 164(f).
When does a side project make financial sense?
- If the effective hourly rate exceeds your primary job rate, the side project is financially efficient for your time.
- Many side projects start below the primary job rate but scale: fixed costs remain constant as revenue grows, improving the effective rate over time.
- Track quarterly: a project generating $500/month in year 1 may reach $5,000/month in year 3 with the same weekly effort if it has network effects or compounds through SEO and referrals.
- Non-financial value also matters: a side project may build skills, portfolio, and personal brand that increase your primary employment rate or lead to full-time business opportunities.
- Deductible expenses reduce your taxable income and SE tax: keep receipts for all business costs per IRS Publication 334.
Side project revenue: frequently asked questions
How do I calculate the effective hourly rate from a side project?
Effective Hourly Rate = (Annual Revenue - Annual Costs) / Annual Hours Worked. This is your true compensation per hour from the side project. Compare it to your primary employment hourly rate to see whether the side project is financially competitive for your time.
What costs should I include in a side project calculation?
Include: software subscriptions, domain and hosting, marketing and advertising, payment processing fees (typically 2.9% + $0.30 per transaction for Stripe/PayPal), any contract labour, materials, and the self-employment tax on net earnings (15.3% on 92.35% of net self-employment income per IRS Schedule SE).
Do I need to pay self-employment tax on side project income?
Yes. If your net self-employment income from a side project exceeds $400 in a calendar year, you are required to file Schedule SE and pay self-employment tax of 15.3% on 92.35% of net earnings, per IRS Publication 334. You may deduct business expenses on Schedule C to reduce net earnings.
When should I make a side project my full-time business?
A common benchmark is when your side project generates 50 to 75% of your current employment take-home pay consistently for 3 to 6 months, and you have 6 months of living expenses in reserve. The transition also depends on benefits replacement cost and tax planning.
What is the IRS Schedule C and when does it apply to a side project?
IRS Schedule C (Profit or Loss from Business) is the tax form self-employed individuals and sole proprietors use to report business income and deductible expenses. It applies to any side project conducted with profit intent, per IRS Publication 334. Net Schedule C income flows to Schedule SE for self-employment tax calculation.
Official sources
- IRS Publication 334, Tax Guide for Small Business (Schedule C): irs.gov/publications/p334.
- IRS, Self-Employment Tax (Schedule SE): irs.gov self-employment tax.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.