If you’re a salaried employee, the amount credited to your bank account each month may be lower than your gross salary because of tax deductions. This is where Tax Deducted at Source (TDS) on salary comes in. Your employer estimates your annual taxable income and deducts tax from your salary during the year.
An income tax calculator can help you estimate your overall tax liability based on your income and eligible deductions. It can also help you understand whether the tax being deducted from your salary is broadly in line with your expected annual liability.
So, how does the calculation work? Let’s break it down in simple terms.
What is TDS on salary?
TDS means tax is deducted before the income reaches you. For salary, the employer is responsible for deducting the applicable tax and depositing it with the government.
For Tax Year 2026-27, salary TDS is governed by the provisions of the Income Tax Act, 2025. The Income Tax Department states that employers must reset their TDS calculation from April 1, 2026, taking projected income, eligible deductions and the employee’s chosen tax regime into account.
So, if you’re wondering why your monthly salary has a TDS deduction, that’s the basic reason.
How does your employer calculate TDS on salary?
The calculation isn’t simply a fixed percentage of your monthly salary.
Your employer generally looks at your expected income for the entire tax year and works out the estimated tax liability. The calculation can take into account salary, applicable exemptions or deductions, and other information you provide to your employer.
This means your TDS can change if your salary changes during the year or if you provide additional eligible information. For example, suppose your salary increases during the year. Your employer may need to recalculate the projected annual income and adjust the remaining monthly TDS accordingly.
That’s why the TDS shown on your payslip isn’t necessarily the final tax you will pay for the year.
Where does an income tax calculator help?
An income tax calculator gives you a way to estimate your tax before you get to the end of the financial year.
The Income Tax Department’s calculator allows taxpayers to enter details such as annual income and applicable deductions. It can also provide a comparison between the old and new tax regimes where relevant.
You can use the calculator to get a clearer picture of:
- Your estimated taxable income
- Your estimated tax liability
- Applicable deductions or exemptions
- The impact of choosing a tax regime
- The approximate amount of tax already deducted
This can be particularly useful when you’re checking whether your monthly salary deductions are broadly matching your expected tax liability.
Step 1: Start with your annual salary
Don’t calculate your tax only from the monthly amount credited to your bank account.
Start with your expected annual salary. This may include your basic salary, allowances, bonuses and other taxable components, depending on your salary structure.
For instance, if your monthly gross salary is ₹75,000, you shouldn’t simply multiply the amount and assume that ₹9 lakh is automatically your taxable income.
Your salary structure and applicable tax rules matter.
The Income Tax Department’s tax calculator allows users to enter relevant income details to arrive at a tax calculation.
Step 2: Check your tax regime
The tax regime you use can affect your tax calculation.
When using an income tax calculator, select the applicable tax regime and enter the required details. The Income Tax Department’s calculator also provides a comparison of tax under the available regimes.
Don’t assume that the regime selected by your employer automatically tells you what your final tax liability will be. Your personal circumstances and applicable provisions matter.
Step 3: Add eligible deductions and other details
Depending on the tax regime and the rules applicable to you, certain deductions or exemptions may affect your taxable income.
The Income Tax Department’s calculator allows relevant deduction details to be entered. Its advanced calculator also covers income from sources such as salary, house property, capital gains, business or profession and other sources.
If you’ve made eligible investments or have other deductible expenses, keep the supporting documents handy. Your employer may ask you to submit the relevant declarations or evidence while calculating TDS.
For salaried employees, Form 12BB is used to provide an employer with particulars of eligible claims such as HRA, home-loan interest and certain tax-saving investments or payments.
Step 4: Compare the estimated tax with TDS
Now comes the useful part.
Once you’ve estimated your annual tax liability, compare it with the TDS on salary already deducted or expected to be deducted. Let’s say your estimated annual tax liability is ₹60,000 and your employer expects to deduct around ₹5,000 per month. Over 12 months, that would amount to ₹60,000.
The figures broadly match. But if your estimated liability is different from the projected TDS, don’t panic. Your employer may adjust the deductions in the remaining months based on updated salary information or eligible declarations.
The idea is to spot a possible difference early rather than discover it only when you file your tax return.
Step 5: Check Form 16 at the end of the year
Once the financial year is over, Form 16 becomes an important document for salaried taxpayers.
It provides details of your salary income, applicable deductions or exemptions and TDS deducted by your employer.
Compare these details with your salary slips and tax records. If something doesn’t look right, contact your employer or payroll team and get it clarified.
Also remember that TDS is not a separate tax. It’s a way of collecting tax during the year.
Why can TDS and final tax liability be different?
This is a common point of confusion.
The TDS deducted by your employer is based on the information and projections available to the employer during the year. Your final tax liability is determined when your complete income and eligible claims are considered.
You may also have income from sources outside your salary, such as interest, capital gains or rental income. The Income Tax Department’s tax tools allow taxpayers to account for different income sources when estimating their tax.
So, don’t assume that the TDS shown on your payslip is the final amount of tax you owe.
A simple example
Let’s say you’re earning a salary of ₹10 lakh a year.
You enter your salary details into an income tax calculator, select the relevant tax regime and provide applicable deduction details.
The calculator gives you an estimated annual tax liability. You can then divide that amount across the remaining salary months to get a rough idea of the monthly tax deduction required. Your employer’s actual TDS calculation may differ because it is based on the employer’s payroll calculation and the information you’ve submitted.
As your salary, deductions or other income change, the estimate can change too.
Keep an eye on your payslip
You don’t need to calculate your taxes every month.
But checking your payslip regularly is a good habit. Look at your gross salary, deductions and net salary, and keep an eye on the TDS amount.
If there’s a significant change in your salary, bonus, deductions or other income, revisit your tax estimate. An income tax calculator is useful for this because you can update the figures and see how the estimated tax changes.
Ending note
Calculating TDS on salary doesn’t have to be complicated. Start with your expected annual income, check the applicable tax regime, consider eligible deductions and use an income tax calculator to estimate your overall tax liability.
Then compare that estimate with the TDS being deducted from your salary. If the numbers don’t match exactly, check what assumptions or income details are being used before drawing a conclusion.
The important thing is to keep your salary details, tax declarations and supporting documents updated. A quick check during the year can help you understand your take-home pay better and avoid surprises when it is time to file your income tax return.
