NPS Calculator — National Pension System Corpus & Pension Estimator | AliGreat.com
Free NPS Calculator for India — estimate your retirement corpus, lump-sum withdrawal and monthly pension from the National Pension System instantly.
The National Pension System (NPS) is one of the few retirement products in India that combines market-linked growth during your working years with a mandatory pension at the end — a structure that also makes it one of the more confusing products to plan around. How much will your monthly contribution actually grow into over 20–30 years? How much of that corpus can you withdraw as a lump sum, and how much gets converted into a pension? The NPS Calculator on AliGreat.com works out all three numbers together.
What does the NPS Calculator do?
Enter your monthly contribution, expected annual return, years remaining until retirement, the share of your corpus you intend to annuitize (a minimum of 40% is mandatory by NPS rules), and the expected annuity rate. The calculator shows your total corpus at retirement, the lump-sum withdrawal amount available to you, the annuity corpus that will be locked into a pension product, and your estimated monthly pension based on the annuity rate you specify.
The formula behind it
The corpus calculation uses the same future-value-of-a-series formula as a SIP, since NPS contributions work the same way — a fixed amount invested every month over a long accumulation period:
Corpus = P × {[(1 + r)ⁿ − 1] / r} × (1 + r)
where P is your monthly contribution, r is the monthly rate of return, and n is the number of months until retirement. Once the total corpus is calculated, the annuity portion (at least 40% of the total, by regulation) is multiplied by the annuity rate you expect and divided by 12 to estimate your monthly pension:
Pension ≈ (Annuity corpus × Annuity rate) / 12
A worked example
Suppose you contribute ₹5,000 every month for 25 years, expecting a 10% annual return, plan to annuitize the minimum 40%, and expect a 6% annuity rate at retirement.
- Total invested = ₹5,000 × 300 months = ₹15,00,000
- Projected corpus at retirement ≈ ₹66,60,000
- Annuity corpus (40%) ≈ ₹26,64,000
- Lump-sum withdrawal (60%) ≈ ₹39,96,000
- Estimated monthly pension ≈ (₹26,64,000 × 6%) / 12 ≈ ₹13,320 per month
This example illustrates a common realisation among NPS investors: a large accumulated corpus can still translate into a fairly modest monthly pension, since only a portion of the total is converted into an annuity, and annuity rates themselves tend to be considerably lower than the accumulation-phase return you may have enjoyed.
The 40% annuity rule, explained in full
At age 60, NPS rules require you to use a minimum of 40% of your accumulated corpus to purchase an annuity — a fixed monthly pension for life, bought from a life insurance company through the NPS system. The remaining amount, up to 60%, can be withdrawn as a completely tax-free lump sum. You’re free to annuitize more than the mandatory 40% if you want a higher guaranteed monthly pension instead of a larger lump sum — the calculator lets you adjust this share to see how the trade-off between lump sum and pension shifts.
This structure is what fundamentally distinguishes NPS from a pure investment product like a mutual fund SIP — part of your money is deliberately, and by regulation, locked into guaranteed lifetime income for old age, rather than remaining fully accessible or fully inheritable in the same way an equity portfolio would be.
Tax benefits worth knowing in detail
NPS contributions are eligible for tax deduction under Section 80CCD(1), which falls within the overall Section 80C limit of ₹1.5 lakh. Beyond that, NPS offers an additional deduction of ₹50,000 under Section 80CCD(1B) — exclusively available in the old tax regime, and not overlapping with the standard 80C limit. This extra deduction is one of the few tax-saving benefits not matched by most other retirement products, making NPS particularly attractive specifically for individuals still filing under the old tax regime who have already exhausted their standard 80C limit through other investments (like PPF, ELSS, or life insurance premiums).
Employer contributions to an employee’s NPS account (under the corporate NPS model) also receive separate tax treatment, up to specified limits, making NPS a useful component of a well-structured CTC for salaried employees whose employers offer this option.
Equity exposure and the automatic glide path
Under NPS’s active choice option, equity allocation is capped by regulation — typically at 75% for investors below 50 years of age, tapering down automatically as you approach retirement age. Under the alternative “auto choice” option, this equity-to-debt shift happens on a pre-defined schedule without requiring any manual intervention from you. This built-in glide path reduces portfolio risk automatically as you age, similar in principle to how many international target-date retirement funds are structured, without requiring you to manually rebalance your allocation every year as you would with a self-managed mutual fund portfolio.
Choosing your fund manager and asset allocation
NPS allows you to choose from several registered pension fund managers and, within limits, your own split between equity (asset class E), corporate bonds (asset class C), and government securities (asset class G). The rate of return you enter into this calculator should reflect a realistic blended expectation across your chosen allocation — a portfolio weighted more heavily toward equity will justify a higher assumed rate (closer to 10-12%) than one weighted more conservatively toward government securities (closer to 7-8%).
NPS Tier I vs Tier II accounts
This calculator models a standard Tier I NPS account — the primary retirement account with tax benefits and withdrawal restrictions until retirement. NPS also offers a Tier II account, which functions more like a flexible investment account with no lock-in and no tax benefit, allowing withdrawals at any time. If you’re specifically calculating a Tier I retirement projection (the far more common use case), this calculator’s assumptions apply directly; a Tier II account would need to be modelled more like a flexible SIP or lumpsum investment instead, without the mandatory annuity structure.
NPS vs PPF — a direct comparison
PPF is the guaranteed, government-backed, fixed-rate component of a retirement portfolio, offering complete tax exemption on contribution, interest, and maturity (EEE status), but with a comparatively lower long-term return due to its conservative, government-set rate. NPS is the higher-growth, market-linked engine, offering an additional tax deduction unavailable to PPF, but with the trade-off of a mandatory annuity purchase and market-linked risk. Many financial planners suggest funding PPF up to its ₹1.5 lakh annual cap first for the guaranteed, fully tax-free component of a retirement plan, then directing additional retirement savings toward NPS (for its extra tax deduction) or directly into equity mutual funds for maximum growth flexibility, since mutual funds don’t carry NPS’s mandatory annuity restriction.
Who should use this calculator
Salaried and self-employed individuals planning long-term retirement savings, especially those in the old tax regime looking to use the additional ₹50,000 deduction under Section 80CCD(1B), will find this calculator useful for estimating both their eventual accumulated corpus and the monthly pension it’s likely to generate at retirement. It’s also a useful tool for deciding how much of your corpus to voluntarily annuitize beyond the mandatory 40% minimum, by comparing the resulting lump sum versus pension trade-off at different annuity share percentages.
Frequently asked questions
Is the NPS pension amount guaranteed for life once it starts? Yes, once you purchase an annuity with your mandatory 40% (or more), the resulting monthly pension is guaranteed for life by the annuity provider, based on the annuity plan you choose.
Can I withdraw my entire NPS corpus as a lump sum at retirement? No — a minimum of 40% must be used to purchase an annuity. Only the remaining amount (up to 60%) can be withdrawn as a lump sum, and that lump sum is tax-free.
What happens to my NPS corpus if I want to exit before age 60? Early exit rules are stricter, generally requiring a higher percentage to be annuitized if the corpus exceeds a certain threshold, and lower lump-sum withdrawal limits apply compared to a retirement-age exit.
Is the annuity rate fixed for the life of the pension? The annuity rate is fixed at the time you purchase the annuity, based on prevailing rates then — it does not change over your pension-receiving years once locked in, similar to how an FD rate is locked in at booking.
Try it now
Open the NPS Calculator on AliGreat.com and see your projected retirement corpus, lump sum and monthly pension — instantly, for free, with every formula shown.