Inputs
Tax model v2025.8
Amount
Side gigs, commissions, tips, rental, one-off bonuses. Each line can have expense % (for freelancers).
Deductions & contributions
Results
Updated: —Net monthly
$0
Effective tax rate
0%
Charts
12‑month projection
| Month | Gross | Tax | Other deductions | Net | Cumulative net |
|---|---|---|---|---|---|
| Total | $0 | $0 | $0 | $0 |
How to calculate monthly income
This calculator converts income from any pay frequency into a transparent monthly breakdown. The core formula is:
Monthly Gross = Σ(Incomei × Frequency Factori × (1 − Expense%i)) + OvertimeTaxable Income = max(0, Monthly Gross − Pre‑tax Contributions − Monthly Standard Deduction)Tax = Flat(Taxable) or Progressive(Annualized Taxable)/12 − Monthly CreditsOther Deductions = Social + Pension + Health + Post‑taxNet Monthly = Monthly Gross − Tax − Other Deductions
| Frequency | Factor → monthly |
|---|---|
| Hourly | (Hours/Week × Weeks/Year × Rate) / 12 |
| Daily | (Days/Week × Weeks/Year × Rate) / 12 |
| Weekly | Rate × 52 / 12 |
| Bi‑weekly | Rate × 26 / 12 |
| Semi‑monthly | Rate × 2 |
| Monthly | Rate |
| Annual | Rate / 12 |
| One‑time | Rate / 12 (if prorated) |
| Component | Description |
|---|---|
| Pre‑tax | Retirement or benefits deducted before tax. Lowers taxable income. |
| Credits | Reduce tax bill directly. Enter as annual amount. |
| Social/Pension | Employer or employee social security style contributions. |
| Health | Fixed monthly health premium. |
| Post‑tax | Other after‑tax deductions such as union dues. |
Assumptions and transparency
Rates are user‑editable. Progressive mode annualizes taxable income to apply brackets then de‑annualizes the result to a monthly amount. This keeps outcomes consistent with typical tax systems.
Frequently Asked Questions
Yes. Enter your rate and working schedule. The calculator annualizes then splits into monthly amounts and applies deductions and your chosen tax model.
Use “Additional income sources”. Each line accepts amount, frequency, and an optional expense percentage if you are self‑employed.
They reduce the taxable base or the final tax. Enter the annual figures; the calculator converts them to monthly impacts.
No. This tool is for educational purposes. Please verify rates with official sources or a qualified professional.