How to Calculate Income Tax 2025: Complete Guide
Learn to calculate your 2025 Income Tax step by step. Updated tax brackets, deductions, and practical tips to avoid mistakes with the Federal Revenue.
Income Tax 2025 is already approaching, and it’s essential to know exactly how to calculate the amount owed to avoid problems with the Federal Revenue Service. Millions of Brazilians need to do this calculation annually, but many still make mistakes that can result in fines or unnecessary payments.
The good news is that IR follows clear and objective rules. With the income tax calculator and correct information about tax rates and deductions, you can determine the exact amount without complications.
What is Income Tax 2025
The Individual Income Tax (IRPF - individual income tax) 2025 is a federal tax levied on income earned in 2024. Unlike other taxes, IR considers your ability to pay - the more you earn, the higher the rate applied.
Who must file
The obligation to file IR in 2025 follows specific criteria established by the Federal Revenue Service:
- Taxable income above R$ 30,639.90 in 2024
- Tax-exempt income exceeding R$ 200,000.00
- Rural activity with gross revenue greater than R$ 153,199.50
- Ownership of assets valued above R$ 800,000.00
- Stock market operations (regardless of amount)
Important deadlines
The IR 2025 calendar has crucial dates you cannot miss:
- March 2025: Start of filing period
- May 31, 2025: Final deadline for submission
- September 2025: Last refund batch
- Late penalty: 1% per month on tax owed (minimum R$ 165.74)
2025 Tax Rate Table
The IR 2025 progressive table maintains the same brackets as 2024, with inflation adjustments. Each bracket has its specific rate and deduction amount.
Tax brackets
| Monthly Income (R$) | Rate | Deduction Amount (R$) |
|---|---|---|
| Up to 2,259.20 | Exempt | - |
| 2,259.21 to 2,826.65 | 7.5% | 169.44 |
| 2,826.66 to 3,751.05 | 15% | 381.44 |
| 3,751.06 to 4,664.68 | 22.5% | 662.77 |
| Above 4,664.68 | 27.5% | 896.00 |
Deduction amount
The deduction amount simplifies the progressive calculation. Instead of calculating each bracket separately, you apply the maximum rate to all income and subtract the corresponding amount.
Example: Income of R$ 5,000 → 5,000 × 27.5% = R$ 1,375 → 1,375 - 896 = R$ 479 in IR
How to Calculate IR Step by Step
Correct IR calculation involves three main steps: identify taxable income, apply allowed deductions, and use the progressive table.
Taxable income
Income that enters the IR calculation includes:
- Salaries and 13th salary (minus INSS - social security)
- Rent received (full amount)
- Alimony received
- Investment returns (CDB, LCI, LCA with IOF)
- Pro-labore and taxable profit distribution
Allowed deductions
Main deductions that reduce the tax base are:
- INSS: Up to R$ 908.85 per month in 2024
- Alimony: Full amount paid by court order
- Dependents: R$ 2,275.08 per dependent/year
- Medical expenses: No limit
- Education: Up to R$ 3,561.50 per person/year
- Private pension: Up to 12% of taxable income
Practical Calculation Example
Let’s calculate the IR for a professional with the following 2024 information:
Taxpayer data:
- Annual salary: R$ 60,000
- INSS deduction: R$ 6,600
- One dependent
- Medical expenses: R$ 2,400
- Education expenses: R$ 3,000
Step 1 - Tax base:
Income: R$ 60,000 Less INSS: R$ 6,600 Less dependent: R$ 2,275.08 Less medical: R$ 2,400 Less education: R$ 3,000 Taxable base: R$ 45,724.92
Step 2 - Tax calculation:
Annual base: R$ 45,724.92 Rate: 27.5% Gross tax: R$ 12,574.35 Less deduction: R$ 10,752.00 IR owed: R$ 1,822.35
Step 3 - IR already withheld:
If employer withheld R$ 2,100 during the year Refund: R$ 277.65
Tips to Reduce Tax
There are legal strategies to reduce IR owed without violating tax legislation.
Maximize deductions
- Organize all medical receipts (appointments, exams, surgeries)
- Prove education expenses (tuition, professional courses)
- Contribute to private pension (up to 12% of income)
- Include eligible dependents (children up to 21, spouse without income)
Plan investments
- Prefer tax-exempt investments (LCI, LCA, CRA, Treasury IPCA+)
- Use private pension as deduction
- Consider equity funds for capital gains exempt up to R$ 20,000/month
Use the calculator
The income tax calculator allows you to simulate different scenarios and find the best strategy for your specific situation.
Frequently Asked Questions
How do I know if I need to file IR in 2025?
You must file if you had taxable income above R$ 30,639.90 in 2024, tax-exempt income exceeding R$ 200,000, or if you own assets above R$ 800,000. It’s also mandatory for those who made stock market operations.
Can I deduct medical expenses without limit?
Yes, there is no limit for medical and hospital expense deductions. You can deduct appointments, exams, surgeries, hospitalizations, orthopedic devices, and even health plans, as long as you have receipts.
How much can I deduct per dependent?
Each dependent allows deduction of R$ 2,275.08 per year (R$ 189.59 per month). This includes children up to 21, spouse without own income, parents over 65 without income, among other specific cases.
What happens if I file late?
The late penalty is 1% per month on tax owed, with minimum value of R$ 165.74. If you’re entitled to a refund, you lose the Selic rate correction and go to the end of the payment line.
Can I amend the return after submission?
Yes, you can amend as many times as you want until the final deadline (May 31). After this date, amendment is still possible, but with possible penalty payment if there’s tax owed.
How does the INSS deduction work in the calculation?
INSS deducted from salary reduces the taxable base for IR. For example, if you earn R$ 5,000 and have R$ 550 INSS deduction, IR is calculated on R$ 4,450. It’s an automatic and mandatory deduction.
Do I need to declare savings account returns?
No, savings account returns are completely tax-exempt and don’t need to be declared. This applies to both interest and monetary correction received during the year.