Income Tax Calculator 2026: New Regime vs Old Regime — Which Saves More?

From April 2024, India's new income tax regime became the default option. Unless you explicitly opt for the old regime at the time of filing, the new regime's rates and rules apply automatically. For home loan borrowers, investors with PPF and ELSS, and HRA claimants — this choice can mean Rs 50,000 to Rs 2 lakh+ in annual tax difference.

This guide provides a clear framework to calculate which regime saves more tax for your specific income and deduction profile.

Old vs New Tax Regime: Rates at a Glance

Old Regime Tax Slabs (FY 2025-26)

Section 87A Rebate: Tax nil if total income ≤ Rs 5 lakh (old regime)

New Regime Tax Slabs (FY 2025-26)

Section 87A Rebate: Tax nil if total income ≤ Rs 7 lakh (new regime)

Deductions: Old Regime vs New Regime

The Break-Even Analysis: When Old Regime Wins

The break-even point is the total deductions level at which old regime tax = new regime tax.

For different income levels, the break-even total deductions are approximately:

Interpretation: If your income is Rs 15 lakh and your total deductions exceed Rs 3,50,000, the old regime saves more. If your deductions are below this threshold, the new regime saves more.

Typical deduction stack for home loan borrower:

• Standard deduction: Rs 75,000
• Section 80C (PPF + ELSS): Rs 1,50,000
• Section 24(b) home loan interest: Rs 2,00,000
• Section 80D (family health insurance): Rs 25,000
• Total: Rs 4,50,000

At Rs 15 lakh income with these deductions, the old regime saves money for most salaried borrowers.

Worked Examples: Old vs New Regime Tax Calculation

Example 1: Income Rs 10 lakh, Home Loan Borrower

Old Regime:

• Gross income: Rs 10,00,000
• Less standard deduction: (Rs 50,000)
• Less 80C: (Rs 1,50,000)
• Less 24(b) home loan interest: (Rs 1,80,000) [actual interest paid]
• Less 80D health insurance: (Rs 25,000)
• Taxable income: Rs 5,95,000
• Tax: Rs 22,500 + 20% × (5,95,000 - 5,00,000) = Rs 22,500 + Rs 19,000 = Rs 41,500
• Plus 4% cess: Rs 1,660
• Total tax: Rs 43,160

New Regime:

• Gross income: Rs 10,00,000
• Less standard deduction: (Rs 75,000)
• Taxable income: Rs 9,25,000
• Tax: 5% × Rs 4,00,000 + 10% × Rs 2,25,000 = Rs 20,000 + Rs 22,500 = Rs 42,500
• Plus 4% cess: Rs 1,700
• Total tax: Rs 44,200

Old regime saves: Rs 1,040 (marginal advantage at this income level with these deductions)

Example 2: Income Rs 15 lakh, Home Loan Borrower with Maximum Deductions

Old Regime:

• Gross income: Rs 15,00,000
• Less standard deduction: (Rs 50,000)
• Less 80C: (Rs 1,50,000)
• Less 24(b) interest: (Rs 2,00,000)
• Less 80D: (Rs 50,000) [senior parent premium]
• Taxable income: Rs 11,00,000
• Tax: Rs 1,12,500 + 30% × (11,00,000 - 10,00,000) = Rs 1,12,500 + Rs 30,000 = Rs 1,42,500
• Plus 4% cess: Rs 5,700
• Total tax: Rs 1,48,200

New Regime:

• Gross income: Rs 15,00,000
• Less standard deduction: (Rs 75,000)
• Taxable income: Rs 14,25,000
• Tax: 5% × Rs 4,00,000 + 10% × Rs 3,00,000 + 15% × Rs 2,00,000 + 20% × Rs 1,25,000 = Rs 20,000 + Rs 30,000 + Rs 30,000 + Rs 25,000 = Rs 1,05,000
• Plus 4% cess: Rs 4,200
• Total tax: Rs 1,09,200

New regime saves: Rs 39,000 at this income level even with all deductions claimed.

Example 3: Income Rs 20 lakh, Maximum Deductions

Old Regime:

• Gross income: Rs 20,00,000
• Deductions: Standard Rs 50,000 + 80C Rs 1,50,000 + 24(b) Rs 2,00,000 + 80D Rs 50,000 = Rs 4,50,000
• Taxable: Rs 15,50,000
• Tax: Rs 1,12,500 + 30% × Rs 5,50,000 = Rs 2,77,500
• Plus 4% cess: Rs 11,100
• Old Regime Tax: Rs 2,88,600

New Regime:

• Gross income: Rs 20,00,000
• Standard deduction: (Rs 75,000) → Taxable: Rs 19,25,000
• Tax: 20% × Rs 3,00,000 + 30% × Rs 4,25,000 = Rs 60,000 + Rs 1,27,500 = Rs 1,87,500 + lower slab amounts ≈ Rs 2,82,500
• Plus 4% cess: Rs 11,300
• New Regime Tax: Rs 2,93,800

Old regime saves: Rs 5,200 at Rs 20 lakh income with maximum deductions.

The Home Loan Impact: Critical Analysis

For home loan borrowers, the new regime's elimination of Section 24(b) (up to Rs 2 lakh interest deduction) is the biggest disadvantage:

This Rs 40,000-60,000 annual tax saving from home loan interest deduction is a strong argument for the old regime, especially for borrowers in the 30% tax bracket.

For detailed home loan tax deduction planning, see our home loan tax benefits guide.

Decision Framework: Which Regime for You?

Choose the NEW regime if:

• Income is below Rs 7 lakh (zero tax regardless)
• Total deductions are below Rs 2.5 lakh (income up to Rs 12 lakh)
• You are young with limited investments and no home loan
• You prefer simplicity and don't want to track deductions
• Your employer is your only income source with no business income

Choose the OLD regime if:

• You have a home loan and are paying Rs 1.5 lakh+ in interest
• You maximise 80C (PPF, ELSS, LIC) at Rs 1.5 lakh
• You claim HRA (metro city rent)
• You pay health insurance premiums above Rs 25,000
• Your combined deductions exceed the break-even threshold

Action step: Calculate your tax under both regimes each April. The regime that minimises your tax liability is the right choice — and the optimal answer can change from year to year. Many salaried employees switch to the old regime in years when they have high home loan interest deductions.

For personalised tax planning integrated with your home loan financial plan, contact Money Matrix Hub.