India ELSS Calculator (SIP/Lump Sum Growth + Section 80C Benefit)

This calculator is built for Indian investors evaluating an Equity Linked Savings Scheme (ELSS) — a category of equity mutual fund that is unique in India for combining two things at once: market-linked equity growth, and eligibility for a Section 80C tax deduction. All figures are in Indian Rupees (₹); this calculator is specific to Indian tax law and does not apply elsewhere.

ELSS funds carry a mandatory 3-year lock-in period, the shortest lock-in of any Section 80C-eligible instrument (compare this to the Public Provident Fund's 15-year term or a 5-year tax-saving fixed deposit). This makes ELSS the most liquid of the traditional 80C options, though "liquid" is relative — the lock-in is not waivable under any circumstance, unlike some other instruments that allow hardship withdrawals. For a Systematic Investment Plan (SIP), a critical and frequently misunderstood detail is that the lock-in applies per installment, not to the whole SIP as one block: each monthly SIP installment carries its own independent 3-year lock-in starting from that specific installment's allotment date. A SIP that started 1 January 2025 and continues monthly has its first installment unlock on 1 January 2028, but its installment from, say, December 2027 does not unlock until December 2030 — the SIP as a whole is not "done" locking in until three years after its very last installment.

The Section 80C deduction — up to ₹1,50,000 per year, shared across all 80C instruments combined (PF, life insurance premium, principal repayment on a home loan, PPF, other ELSS, etc.) — is available only under the old tax regime. India's new tax regime, the default since FY 2023-24 and further revised by Budget 2025 with wider slabs and a higher Section 87A rebate threshold, does not permit Section 80C or most other Chapter VI-A deductions at all. An investor who has switched to (or defaults into) the new regime still gets the market-linked growth and still faces the same 3-year lock-in on an ELSS investment, but gets zero upfront tax benefit from it — a distinction this calculator makes explicit rather than assuming the deduction always applies.

Growth (SIP mode): Modeled as a fixed monthly payment annuity-due (SIP installments are typically debited at the start of each month), solved via the standard time-value-of-money future-value formula with monthly compounding:

$$FV = PMT \times \frac{(1+i)^n - 1}{i} \times (1 + i)$$

where $i$ is the monthly rate (annual rate ÷ 12) and $n$ is the number of months.

Growth (lump sum mode): Simple annual compounding:

$$FV = \text{Lump Sum} \times (1 + \text{Annual Return Rate})^{\text{Years}}$$

Section 80C benefit (old regime only):

$$\text{Remaining Cap} = \max(0,\ ₹1{,}50{,}000 - \text{Other Section 80C Used This Year})$$ $$\text{Eligible Contribution} = \min(\text{This Year's Contribution},\ \text{Remaining Cap})$$ $$\text{Tax Saved} = \text{Eligible Contribution} \times \text{Marginal Slab Rate}$$

Under the new regime, tax saved is always ₹0 regardless of contribution size.

An investor contributes ₹12,500 every month via SIP for 10 years, assumes a 12% annual return, files under the old regime, and has ₹10,00,000 of other taxable income (placing them in the 20% slab), with no other Section 80C usage.

• Future value = ₹12,500 monthly SIP compounded over 120 months at 1% monthly (12% ÷ 12) with annuity-due timing = ₹29,04,238.45.
• Total invested = ₹12,500 × 120 = ₹15,00,000. Total growth = ₹29,04,238.45 − ₹15,00,000 = ₹14,04,238.45.
• Lock-in check: a 10-year horizon comfortably satisfies the mandatory 3-year lock-in.
• This year's contribution = ₹12,500 × 12 = ₹1,50,000, exactly at the ₹1,50,000 annual 80C cap, so the full amount is eligible.
• Tax saved (this year) = ₹1,50,000 × 20% = ₹30,000.

If the same investor had instead been filing under the new regime, the growth projection would be identical (₹29,04,238.45 at maturity), but the Section 80C tax-saved figure would be ₹0 — the deduction simply isn't available, a fact this calculator surfaces explicitly rather than silently assuming the old regime.

This calculator projects growth using a single constant assumed annual return; ELSS funds are equity-linked and their actual returns are volatile and not guaranteed, unlike a fixed-income instrument. It computes the Section 80C tax benefit for a single year's contribution pattern; it does not project the benefit forward across the entire investment horizon assuming you keep contributing at the same level every year (in practice, the benefit recurs annually as long as you keep contributing and remain in the old regime with cap headroom available). It does not model the tax treatment of the ELSS units themselves at redemption — gains on ELSS units, being equity-oriented mutual fund units, are subject to the same Section 112A long-term capital gains rules (12.5% above the ₹1,25,000 annual exemption) covered by this platform's separate India Equity LTCG/STCG Calculator, which this growth-focused tool does not compute. It does not model exit loads (ELSS funds typically have none, given the lock-in makes them redundant, but this is not universal) or expense ratios, both of which would reduce the net return below the gross assumed rate. It does not account for a change in tax regime between the year of investment and the year of redemption, or for the Section 87A rebate, which can make the marginal-rate benefit calculation moot for taxpayers whose total income falls below the rebate threshold.

• Assuming the SIP lock-in is 3 years from the first installment. Each installment has its own 3-year lock-in from its own date; the last installment in a long-running SIP doesn't unlock until 3 years after it was invested, not 3 years after the SIP started.
• Forgetting the new regime blocks 80C entirely. Many investors default into the new regime (it's the default since FY 2023-24) without realizing this eliminates the tax-saving half of ELSS's value proposition, even though the growth and lock-in are unaffected.
• Treating the ₹1,50,000 cap as ELSS-specific. It's a combined cap across all Section 80C instruments — PF, insurance, principal repayment, PPF, and ELSS all draw from the same ₹1,50,000 annual bucket.
• Comparing ELSS to PPF purely on lock-in length without weighing the return profile. ELSS's 3-year lock-in is much shorter than PPF's 15-year term, but ELSS is market-linked equity (volatile, no guaranteed return) while PPF is a fixed, government-guaranteed rate — the comparison is not apples-to-apples on risk.
• Assuming ELSS redemption after the lock-in is tax-free. Only the 3-year lock-in expires; the redemption gain is still subject to Section 112A LTCG tax exactly like any other equity mutual fund unit held long-term.

• SEBI (Mutual Funds) Regulations, 1996, and associated Equity Linked Savings Scheme framework (3-year mandatory lock-in).
• Section 80C of the Income-tax Act (₹1,50,000 annual aggregate cap, old-regime-only availability).
• Section 112A of the Income-tax Act, 1961 / Section 198 of the Income-tax Act, 2025 (long-term capital gains treatment of ELSS units on redemption, taxed identically to other equity-oriented mutual fund units).