NPS Calculator

What it calculates

The National Pension System (NPS) is a voluntary, market-linked retirement scheme regulated by the Pension Fund Regulatory and Development Authority (PFRDA). You contribute regularly while working; at retirement part of the accumulated money buys an annuity (a regular pension) and the rest can be withdrawn.

This calculator projects how your contributions could grow and splits the projected corpus into an annuity portion and a lump-sum portion, so you can see the effect of starting early, contributing more or choosing a different annuity share.

How it works

Each month’s contribution is added at the start of the month and grows at your expected return, compounded monthly, until your retirement age. If you enter a yearly increase, the monthly contribution rises by that percentage every year.

At retirement, the corpus is divided using the annuity share you choose. The monthly pension is a simple estimate: the annuity amount multiplied by the annuity rate, divided by 12.

Formula

Corpus = Σ Cₖ × (1 + r/12)^(N − k), for k = 0 … N − 1; Pension ≈ Corpus × a% × annuity rate ÷ 12

Cₖ = contribution in month k (with any yearly step-up)
r = expected annual return
N = months until retirement
a% = share of corpus used for the annuity

How to use it

Enter your current age and the age at which you plan to exit NPS.
Enter what you will contribute each month, and any yearly increase.
Choose an expected annual return — try a cautious and an optimistic figure.
Choose your subscriber type and the share of the corpus you would use to buy an annuity.
Read the estimated corpus, lump sum and pension, then open the year-by-year table.

With the default inputs — age 30, ₹5,000 a month until 60, 9% expected return and 40% annuitised at 6% — the calculator gives:

Why it helps

Shows how much of the final corpus comes from growth rather than contributions.
Lets you compare retirement ages, contribution levels and annuity shares side by side.
Reflects the minimum annuity share for your subscriber type under the current exit rules.

Limitations

Returns are assumed constant; real NPS returns vary with the markets and your fund choices.
Fund management charges, and tax on withdrawals and pension, are not deducted.
Actual annuity rates depend on the annuity provider, plan and your age at purchase.
Special withdrawal options for small corpus sizes are flagged but not modelled in detail.

Frequently asked questions

Is the pension shown guaranteed?

No. The corpus depends on market returns during your working years and the pension depends on annuity rates available when you retire. Treat the figures as a planning estimate.

What is the minimum annuity share?

Under the exit rules checked for this version (PFRDA exit rules as amended December 2025), non-government subscribers generally need to annuitise at least 20% of a corpus above ₹12 lakh and government subscribers at least 40%. Smaller corpus sizes have other options. Check PFRDA’s current rules before you exit.

Why does starting earlier make such a difference?

Money contributed early has more years to compound. Try moving your current age by five years and compare the corpus.

Does the calculator include tax benefits?

No. Deductions for contributions and the tax treatment of withdrawals depend on your regime and the law in force, so they are left out.

Sources

PFRDA (Exits and Withdrawals under NPS) (Amendment) Regulations, 2025 — reviewer to add the exact notification link — Pension Fund Regulatory and Development Authority (PFRDA) (checked 2026-09-27)

This calculator gives an estimate for planning only. It is not investment, tax or financial advice, and results are not guaranteed. Actual outcomes depend on market conditions, product terms and the law in force. Speak to a qualified professional before making a decision.