Advance Tax, TDS & NPS:
The High-Cost Traps of Switching Tax Regimes

Your employer's TDS calculation is not the same thing as your final tax liability. This matters when you start the year under one tax regime and later realise that the other regime is better.

For example, you may have initially declared:

• HRA;
• home-loan interest;
• 80C investments; or
• other old-regime deductions

to your employer, so payroll calculates TDS under the old regime. Later, you may discover that the new tax regime gives you a lower final tax bill.

That can raise several questions:

• Can you change the regime when filing your ITR?
• Should you pay advance tax if your employer is already deducting TDS?
• Will advance tax stop or reduce salary TDS?
• What happens if payroll later removes an HRA exemption?
• How does NPS work under the two regimes?
• Is the 14% NPS limit available if the employer contributes only 10%?
• What other legitimate tax-saving opportunities should you review?

The clean way to think about the problem is:

For a salaried taxpayer without business/professional income, the regime can generally be changed each year in the ITR, subject to the statutory filing conditions. The new regime is the default regime.

1. Old regime vs new regime: start with the numbers

For AY 2026-27 / FY 2025-26, the new regime has substantially lower slab rates and a higher Section 87A rebate threshold than the old regime. The Income Tax Department's AY 2026-27 guidance shows the new-regime slabs beginning at ₹4 lakh and the rebate applying up to ₹12 lakh of total income, subject to the statutory conditions.

For Tax Year 2026-27 / FY 2026-27, the Income-tax Act, 2025 applies. The Department confirms that the basic tax-payment framework continues under the new Act, while the new Act reorganises the statutory provisions.

The practical lesson

Do not choose the old regime merely because:

"I have deductions."

And do not choose the new regime merely because:

"Its tax slabs are lower."

Calculate both.

2. If your employer uses the old regime, are you locked into it?

Not if you are a non-business salaried taxpayer and the statutory conditions are met. The Income Tax Department specifically states that, in non-business cases, the taxpayer can change the tax-regime choice every year directly in the ITR, provided the return is filed within the Section 139(1) due date.

There is an important distinction between:

Telling your employer

You tell payroll which regime you intend to use so that it can calculate salary TDS.

Exercising the tax-regime option in the ITR

For a non-business taxpayer, the final choice is made in the return, subject to the statutory conditions. The Department expressly says that informing the employer does not by itself constitute the formal exercise of the option to opt out of the new regime.

Business/professional income is different

If you have business or professional income, the regime-switching rules are more restrictive and Form 10-IEA may be relevant. Do not apply the simple salaried-employee rule to a person who also has business/professional income.

3. What if your employer is deducting too much TDS because of HRA?

Suppose your employer initially considered HRA exemption.

Later you realise that:

• you cannot substantiate the exemption;
• the exemption amount is lower than expected; or
• you are ultimately going to choose the new regime, where HRA exemption is not available.

Under the new regime, HRA exemption under Section 10(13A) is not available. Payroll can therefore recalculate salary TDS based on the correct projected taxable salary. Section 192 permits the employer to make appropriate adjustments for excess or short deduction during the financial year.

Do not panic if TDS suddenly increases

A higher payroll deduction is not a new tax. It is simply more tax being collected through TDS during the year.

Your final liability is still determined in the ITR after considering:

actual income + eligible deductions/exemptions + tax already paid.

4. Can you pay advance tax even though your employer is deducting TDS?

Yes, if advance tax is actually payable. Broadly, an individual is liable to pay advance tax where the tax payable during the year is ₹10,000 or more, subject to statutory exceptions.

For most individual taxpayers, the cumulative instalments are:

Tax paid by 31 March is treated as advance tax for the relevant year.

When does this matter for a salaried employee?

Usually when TDS will not cover the final liability because of:

• interest income;
• rental income;
• capital gains;
• freelance income;
• a large bonus;
• other taxable receipts; or
• a change in the tax regime/deductions.

5. Does advance tax reduce your employer's TDS?

Not automatically. This is one of the most important distinctions.

Salary TDS

Employer → deducts TDS

Advance tax

You → pay advance tax

Final ITR

TDS + advance tax + other eligible tax credits → adjusted against final tax liability So if you pay ₹1 lakh as advance tax, do not assume that your employer will automatically reduce future salary TDS by ₹1 lakh. The two mechanisms operate separately. If the total tax paid eventually exceeds your final liability, the excess may result in a refund after return processing.

6. How much advance tax should you pay?

Do not pay an arbitrary amount. Prepare a full-year estimate.

Add expected income

• salary;
• bonus;
• interest;
• dividends;
• rent;
• capital gains;
• freelance/business income;
• other taxable income.

Calculate under both regimes

Compare:

Old regime tax vs New regime tax

Reduce taxes already expected to be paid

• TDS already deducted;
• expected remaining TDS;
• TDS/TCS credits, where applicable;
• advance tax already paid.

The balance gives you a better estimate of the additional tax payment required. If your income changes later, revise the estimate and adjust subsequent advance-tax instalments accordingly. The Department's guidance expressly recognises that advance-tax estimates can change during the year.

7. What about NPS? The 14% rule needs careful reading

The 14% figure is an employer-contribution limit under Section 80CCD(2). For the new regime, the Department's current AY 2026-27 validation rules permit an eligible employee deduction for employer NPS contribution up to 14% of salary, subject to the statutory conditions.

This does not mean:

Employer contributes 10% + employee contributes 4% = 14% employer contribution.

That is incorrect.

Example

Eligible salary for the NPS calculation:

₹10 lakh

Employer contribution:

10% = ₹1 lakh

You cannot claim:

14% = ₹1.40 lakh unless the employer actually makes the additional eligible contribution. The deduction is based on the actual eligible employer contribution, subject to the applicable percentage limit.

8. What happens to your own NPS contribution?

This is separate from employer contribution.

Under the old regime, an employee's own NPS contribution can potentially qualify under:

• Section 80CCD(1), subject to conditions; and
• Section 80CCD(1B), including the additional deduction of up to ₹50,000.

Under the new regime, the employee-side deductions under 80CCD(1) and 80CCD(1B) are not available. The major NPS deduction that survives under the new regime is the eligible employer contribution under Section 80CCD(2).

Practical conclusion

If you are deciding between regimes, do not count your own ₹50,000 NPS contribution as a new-regime deduction. But do include eligible employer NPS contributions in the new-regime comparison.

9. The best tax-saving opportunities under the new regime

The new regime is not simply "no deductions." Several tax-efficient items remain relevant.

1. Employer NPS contribution

This is one of the most important surviving deductions. An eligible employer contribution to NPS under Section 80CCD(2) can be deducted within the statutory limit. For the new regime, the current limit is up to 14% of salary, subject to the conditions.

Planning tip: If your employer offers NPS as part of your compensation structure, compare the tax benefit before finalising your salary structure.

2. Standard deduction

The standard deduction is available under the new regime as well. For AY 2026-27, the Department's validation rules show a maximum standard deduction of ₹75,000 for employees under the new regime. This makes the new regime substantially more attractive for many salaried taxpayers even when they do not have large deductions.

3. Employer-provided benefits and salary restructuring

Not every tax-saving decision requires an investment. Review whether your employer offers tax-efficient components or benefits permitted under the applicable regime and salary-TDS rules.

The important principle is:

A ₹1 tax saving is not worth spending ₹1 unnecessarily.

4. HRA - only if the old regime is actually better

HRA exemption is available under the old regime subject to the statutory conditions. It is not available under the new regime.

Therefore, if HRA is your main reason for selecting the old regime, compare:

Actual HRA exemption against Additional tax payable under the old regime because of higher slab rates. Do not assume HRA automatically makes the old regime better.

5. Home-loan interest

For a self-occupied house, the old regime can provide a deduction for eligible interest on borrowed capital, subject to the statutory limits and conditions. The new regime does not allow the normal self-occupied-house interest deduction under Section 24(b). Therefore, a taxpayer with a substantial home-loan interest deduction should run an old-vs-new comparison rather than choosing a regime based on salary alone.

10. Other tax-saving opportunities under the old regime

If the old regime is financially better, review the deductions you can actually qualify for.

Section 80C

Potential eligible investments/payments include items such as:

• EPF;
• PPF;
• eligible life-insurance premiums;
• ELSS;
• children's tuition fees;
• eligible home-loan principal repayment; and
• other qualifying investments/payments.

Do not invest ₹1.50 lakh simply because the limit exists. Invest only where the underlying product fits your financial plan.

Section 80D

Eligible health-insurance premiums can provide a deduction under Section 80D, subject to the applicable limits and conditions. This is a useful example of a deduction that can have both financial-protection and tax-planning value.

Section 80CCD(1B)

If you are under the old regime, your own NPS contribution can potentially provide the additional deduction of up to ₹50,000, subject to the statutory conditions.

Section 80G

Eligible donations can qualify for deduction, but not every donation is deductible and not every eligible donation gives a 100% deduction. Check the donee's eligibility and the applicable payment/documentation requirements before assuming a tax benefit. The Department specifically cautions taxpayers that not all donations qualify for 100% deduction.

Education-loan interest

Eligible interest on an education loan may qualify for deduction under Section 80E, subject to the statutory conditions. This can be relevant for taxpayers repaying higher-education loans.

Home-loan principal and other eligible payments

Where the old regime is selected, review eligible principal repayments and other qualifying payments under the applicable provisions. Again, do not create an investment solely for the deduction.

11. Tax-saving tips that are not "invest more"

Good tax planning is not simply buying more products before 31 March.

Tip 1: Compare regimes before investing

Do not invest ₹1.5 lakh under 80C first and compare the regimes later. Calculate first. Then invest only if the old regime remains preferable and the investment makes financial sense.

Tip 2: Check employer benefits early

If your employer offers:

• NPS;
• eligible salary components;
• reimbursement structures; or
• other permitted benefits,

review them before the payroll year is almost over. Some opportunities are easier to implement prospectively than retrospectively.

Tip 3: Track capital gains during the year

A large equity, mutual-fund, property or other investment sale can create an unexpected tax liability. Do not wait until March to discover that TDS on salary does not cover the capital-gains tax. Estimate advance tax when gains arise.

Tip 4: Track interest income

Bank and FD interest is often overlooked because there is already TDS on some interest.

Remember:

Reconcile interest income with Form 26AS/AIS and bank certificates.

Tip 5: Use the correct tax regime for the year

The new regime is the default, but non-business taxpayers can generally choose the old regime each year through the ITR, subject to the filing conditions. Do not carry forward last year's regime choice blindly.

Tip 6: Keep documentation

The ITR is generally annexure-less, but taxpayers should retain supporting documents for exemptions, deductions, investments, tax payments and other claims. The Department specifically advises taxpayers to retain such records for possible assessment or inquiry.

12. A simple old-vs-new decision framework

Use this sequence.

Step 1 - Calculate salary income

Include:

• basic salary;
• allowances;
• bonus;
• perquisites;
• employer NPS contribution where relevant.

Step 2 - Add other income

Include:

• interest;
• rent;
• dividends;
• capital gains;
• freelance/business income;
• other taxable receipts.

Step 3 - Calculate old-regime taxable income

Apply only deductions/exemptions you actually qualify for.

Step 4 - Calculate new-regime taxable income

Apply the deductions permitted under the new regime, including eligible employer NPS contribution and standard deduction.

Step 5 - Compare final tax

Do not compare gross deductions. Compare actual final tax payable.

Step 6 - Compare tax already paid

Subtract:

• TDS;
• advance tax;
• TDS/TCS credits.

Step 7 - Decide whether advance tax is required

If the remaining liability crosses the statutory threshold, calculate the required instalment.

13. A numerical illustration

Assume an employee has:

• salary and other taxable income: ₹18 lakh
• old-regime deductions/exemptions: ₹4 lakh
• eligible employer NPS contribution: ₹1.4 lakh
• TDS already deducted: ₹2 lakh

The correct approach is not:

"I have ₹4 lakh deductions, so old regime must be better."

Instead, calculate:

Old regime

Taxable income after eligible old-regime deductions/exemptions.

New regime

Taxable income after permitted new-regime deductions, including standard deduction and eligible employer NPS contribution. Then compare the actual tax after rebate, surcharge and cess, where applicable. If the new regime produces a lower liability but TDS was calculated under the old regime, the difference is simply reconciled through the final tax computation.

14. The five mistakes that cost salaried taxpayers money

1. Choosing the regime based on TDS

Payroll TDS is not the final tax computation.

2. Buying investments solely for 80C

A tax deduction does not make a poor investment good.

3. Ignoring employer NPS

Under the new regime, employer NPS can be one of the most valuable remaining tax-planning tools.

4. Treating personal NPS as employer NPS

The 14% limit does not work that way.

5. Ignoring other income

Interest and capital gains can create advance-tax liability even when salary TDS is being deducted correctly.

15. Your year-round tax checklist

April-June

July-September

October-December

January-March

Before filing the ITR

The Income Tax Department itself recommends checking AIS, Form 26AS, TDS and tax-paid details before filing.

The bottom line

For most salaried taxpayers, the right question is not:

"How much can I save under the old regime?"

It is:

"Which regime gives me the lowest legitimate tax after considering my actual income, deductions, employer NPS and other sources of income?"

Remember the four separate concepts:

Tax regime → determines how your income is taxed
TDS → tax collected by your employer
Advance tax → tax paid by you during the year
Final ITR → reconciles your actual liability with all taxes already paid

And for NPS:

The most effective tax planning is usually early, data-driven and based on the full-year picture - not a last-week-of-March rush to buy investments.

Want to know which regime is actually better for you?

Anmol Aniket and Associates can help with:

• Old vs new regime comparison
• Salary TDS review
• Advance-tax computation
• NPS tax planning
• HRA and home-loan analysis
• Capital-gains and other-income tax planning
• Year-end tax optimisation
• ITR filing and regime selection

Official references

• Income Tax Department - Salaried Individuals for AY 2026-27.
• Income Tax Department - New Tax vs Old Tax Regime FAQs.
• Income Tax Department - Tax Payments / Advance Tax under the Income-tax Act, 2025.
• Income Tax Department - ITR-1 FAQs and advance-tax guidance.
• CBDT - AY 2026-27 ITR-1 validation rules, including ₹75,000 standard deduction and 14% employer NPS limit.
• Income Tax Department - TDS compliance and transition to the Income-tax Act, 2025.