In the Indian payroll ecosystem, TDS (Tax Deducted at Source) is often the largest deduction on an employee's payslip. For an employer, it isn't just a calculation — it's a fiduciary responsibility. Under Section 192 of the Income Tax Act, employers are mandated to estimate an employee's annual income, apply the relevant tax slabs, and deduct tax proportionately every month.
With the introduction of the New Tax Regime as the default and shifting slabs for FY 2025-26, calculating TDS accurately across various salary components has become a high-precision task.
1. What is TDS and Why is it Necessary?
Tax Deducted at Source (TDS) is a mechanism introduced by the Government of India to collect taxes at the very point of income generation.
Why the Government Mandates TDS
- Timely Revenue: It ensures a steady flow of tax revenue throughout the financial year rather than a lump sum at the end.
- Prevents Tax Evasion: Since the tax is deducted by the payer (employer) and tied to the recipient's (employee) PAN, it creates an unalterable digital trail.
- Ease for Employees: It prevents the "tax shock" of paying a massive amount during ITR filing by spreading the liability over 12 months.
2. Component-Wise TDS Calculation
To calculate TDS accurately, you must categorise salary components into Taxable, Exempt, and Perquisites.
A. Fully Taxable Components
- Basic Pay & Dearness Allowance (DA): These form the core of the taxable salary.
- Bonus & Commissions: Fully taxable in the year they are received.
- Special Allowances: Most flat monthly allowances (unless specifically exempt) are added to taxable income.
B. Exemptions & Deductions (The Reducers)
This is where most calculation errors occur. Accurate TDS requires subtracting:
| Deduction | New Tax Regime (Default) | Old Tax Regime |
|---|---|---|
| Standard Deduction | ₹75,000 (w.e.f. AY 2025-26) | ₹50,000 |
| HRA Exemption (Section 10(13A)) | Not Available | Available (based on actual rent) |
| Chapter VI-A (80C, 80D, etc.) | Not Available | Up to ₹1.5 Lakhs under Section 80C |
Check out our Detailed Guide on HRA Exemptions and Rules.
3. The Consequences: What Happens if TDS is Not Deducted?
Failure to deduct or deposit TDS is a serious compliance breach that triggers three layers of penalties.
I. Financial Interest
- Non-Deduction: 1% interest per month from the date the tax was deductible to the date it is actually deducted.
- Non-Payment (After Deduction): 1.5% interest per month from the date of deduction to the date of actual payment to the government.
II. Disallowance of Expenses
Under Section 40(a)(ia), if an employer fails to deduct TDS on a resident's salary, 30% of that salary expense is disallowed as a business deduction. This effectively increases the employer's own corporate tax liability.
III. Penalties & Prosecution
Assessing Officers can levy a penalty equal to the amount of tax failed to be deducted (Section 271C). In cases of wilful default, Section 276B allows for rigorous imprisonment ranging from 3 months to 7 years.
4. Remedies for TDS Defaults
If you have missed a deduction or made an error, immediate corrective action is the only way to minimise interest.
Immediate Deposit
Deposit the principal tax amount via Challan ITNS 281 as soon as the error is spotted. Every day of delay adds to the interest liability.
Calculate & Pay Interest
Compute the 1% or 1.5% interest and pay it voluntarily before a notice is issued. Voluntary payment significantly reduces the risk of prosecution.
File Revised Returns
If the original quarterly Form 24Q has already been filed, you must file a Correction Statement via the TRACES portal to reflect the new payment.
Section 201(1) Relief
If the employee has already paid the tax on that income and filed their ITR, the employer may be treated as a "deductor not in default" provided they obtain a certificate in Form 26A from a Chartered Accountant.
How ZiacPay Automates TDS Precision
Manually managing two tax regimes and monthly VDA-linked salary changes is a recipe for Spreadsheet Errors. ZiacPay's statutory engine handles the complexity for you.
- Dual-Regime Simulator: Allow employees to choose between Old and New regimes; ZiacPay automatically applies the correct slabs and deductions — including the enhanced ₹75,000 standard deduction under the New Regime.
- Automated Interest Calculation: If a payment is delayed, ZiacPay calculates the exact interest liability (1% or 1.5%) to ensure your challan is accurate and voluntary payment is prompt.
- Direct Form 24Q Generation: Export error-free FVU files for quarterly returns directly from the payroll data, ensuring what you deduct is exactly what you report.
Pro-Tip: With the 2025 budget updates, the New Tax Regime is the default. If your employees don't submit a declaration, ZiacPay automatically switches to the New Regime to keep you compliant with the latest CBDT circulars.
Conclusion: Precision is Non-Negotiable
TDS on salary is one area of payroll where errors have immediate, compounding consequences — from interest payments to potential prosecution. The complexity of dual tax regimes, component-wise exemptions, and quarterly reconciliation makes automation not just convenient but essential for risk management.