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What does maximising Section 80C actually save for a 30%-slab old-regime filer?

Scenario

Old-regime filer in 30% slab, ₹15 lakh income, contributing the full ₹1.5 lakh under 80C through a combination of PPF ₹50K + ELSS ₹50K + life insurance premium ₹30K + already-counted home loan principal ₹20K

Inputs

Slab %
30
Income INR
15,00,000
Section 80c amount INR
1,50,000

Calculation

  1. 1.

    Without 80C: taxable income (after ₹75K standard deduction)

    ₹15L − ₹75K₹14.25 L

  2. 2.

    Without 80C: tax under old regime slabs

    ₹12.5K + 20% × ₹5L + 30% × ₹4.25L₹2.40 L

  3. 3.

    With 80C ₹1.5L: taxable income

    ₹15L − ₹75K − ₹1.5L₹12.75 L

  4. 4.

    With 80C ₹1.5L: tax under old regime slabs

    ₹12.5K + 20% × ₹5L + 30% × ₹2.75L₹1.95 L

  5. 5.

    Tax saving from 80C

    ₹2.4L − ₹1.95L₹45,000

Conclusion

Maxing the ₹1.5L 80C cap saves ₹45,000 in tax annually for a 30%-slab old-regime filer — effectively a 30% upfront subsidy on the contribution. The benefit shrinks to ₹30K at 20% slab, ₹7.5K at 5% slab, and zero in the new regime.

Tradeoffs

The ₹45K saving is real but small versus structural choices: direct vs regular plan TER drag over 25 years (₹35L), index vs active fund choice (₹10-50L), home loan prepay vs invest math (₹20-50L). Don't let 80C optimisation drive bad instrument choices — buying ULIPs or endowment plans under 80C pressure typically destroys more value than the deduction saves.

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