Mexico Income Tax Calculator (ISR + IMSS Estimate)
Use this calculator to estimate annual income tax in Mexico, including progressive ISR and an employee IMSS estimate.
If you are searching for a practical Mexico tax calculator, you are probably trying to answer one key question: how much of my income will I actually keep? This page gives you a quick, usable estimate and then explains exactly how the numbers work so you can make better financial decisions.
How this Mexico tax calculator works
The calculator follows a simple flow that mirrors real-world tax logic:
1) Estimate annual gross income
We start with monthly salary, then annualize it by multiplying by 12. We also add your aguinaldo and any other taxable annual income.
- Annual salary = monthly salary × 12
- Aguinaldo estimate = monthly salary × (aguinaldo days ÷ 30)
- Total gross annual income = annual salary + aguinaldo + other income
2) Subtract deductible expenses
From your gross income, the calculator subtracts annual deductible expenses that you enter. This produces your estimated taxable base for ISR.
3) Apply progressive ISR brackets
Mexico uses a progressive tax structure for individuals. Each bracket has a fixed quota plus a percentage on the excess over the lower limit. As income rises, the marginal rate increases.
4) Add employee IMSS estimate
Payroll in Mexico often includes social security withholding. Since this varies by salary structure and legal caps, this calculator lets you set an estimated IMSS percentage to better approximate take-home pay.
ISR brackets used in this calculator (annual model)
These are the annual brackets used in the calculation logic for planning purposes:
| Lower Limit (MXN) | Upper Limit (MXN) | Fixed Quota (MXN) | Rate on Excess |
|---|---|---|---|
| 0.01 | 8,952.49 | 0.00 | 1.92% |
| 8,952.50 | 75,984.55 | 171.88 | 6.40% |
| 75,984.56 | 133,536.07 | 4,461.94 | 10.88% |
| 133,536.08 | 155,229.80 | 10,723.55 | 16.00% |
| 155,229.81 | 185,852.57 | 14,194.54 | 17.92% |
| 185,852.58 | 374,837.88 | 19,682.13 | 21.36% |
| 374,837.89 | 590,795.99 | 60,049.40 | 23.52% |
| 590,796.00 | 1,127,926.84 | 110,842.74 | 30.00% |
| 1,127,926.85 | 1,503,902.46 | 272,981.99 | 32.00% |
| 1,503,902.47 | 4,511,707.37 | 392,294.17 | 34.00% |
| 4,511,707.38 | And above | 1,414,947.85 | 35.00% |
What counts as deductible expenses in Mexico?
Depending on your tax situation, common personal deductions may include specific medical expenses, qualified education expenses, mortgage interest, retirement contributions, and certain insurance premiums. Limits and eligibility rules apply, so always verify against current SAT guidance.
- Medical and dental services from authorized providers
- Hospital expenses and prescription medicines billed by hospitals
- Real mortgage interest (for qualifying home loans)
- Retirement and pension savings contributions
- Tuition payments under established annual caps
Employee vs freelancer tax planning
If you are a salaried employee, payroll withholding usually covers your ISR and social security contributions during the year. If you are a contractor or freelancer, cash-flow planning becomes even more important because you may need monthly provisional payments and a yearly regularization.
For freelancers and small business owners, keeping disciplined records is essential. Track invoices, deductible expenses, and tax receipts every month so your annual filing is smoother and your estimate from any Mexico income tax calculator stays close to reality.
Ways to legally reduce your tax burden
- Document all eligible deductions with proper CFDI invoices.
- Contribute to retirement plans that offer tax advantages.
- Review your tax regime and activity codes for proper classification.
- Avoid last-minute filing by doing quarterly or monthly checkups.
- Work with a qualified contador if your income sources are complex.
Frequently asked questions
Is this an official SAT calculator?
No. This is an educational calculator for planning and budgeting. For filing decisions, cross-check with SAT tools and professional advice.
Why is my payroll different from the estimate?
Real payroll can include exemptions, benefits integration, employment subsidy rules, caps, and company-specific calculations that may not be fully reflected in a simplified model.
Can I use this for annual tax return preparation?
Use it as a first-pass estimate only. Before filing, reconcile with your official records, CFDI payroll receipts, and your accountant’s review.
Final note
A good Mexico tax calculator helps you move from guesswork to planning. Even a quick estimate of ISR, IMSS, and effective tax rate can improve salary negotiations, freelance pricing, savings goals, and year-end tax readiness.