How the NPS Calculator Builds Your Retirement Corpus
How current corpus, beginning-of-month contributions, monthly compounding and annual contribution increases produce the projected NPS corpus.
- Published
- Published
- Updated
- Updated
- Reading time
- 7 min read
This article is for education and general information. See the Financial Disclaimer before using it for an important decision.
Ages determine the number of modeled months
The engine subtracts current age from retirement age to obtain a whole-year duration, then multiplies that duration by 12. Retirement age must be greater than current age, and both ages must be whole numbers within the calculator's supported range.
The calculator enforces its supported age boundaries, but entering an age does not establish NPS eligibility or an exit entitlement.
Current corpus and each contribution compound monthly
The current corpus is the opening balance. At the beginning of each modeled month, the engine adds that month's contribution and then applies a monthly-equivalent rate equal to the entered annual return divided by 12.
This is a constant projection convention. It does not model daily valuation, unit allocation, asset allocation, charges or actual NPS fund performance.
The contribution steps up after each completed year
The starting monthly contribution remains unchanged for the first 12 contributions. If an annual increase is entered, the engine increases the monthly amount before contribution 13 and after each later completed 12-month block.
| Starting monthly contribution | Annual increase | Modeled months | Total contributions | Final monthly contribution | Projected corpus |
|---|---|---|---|---|---|
| ₹5,000.00 | 10% | 24 | ₹1,26,000.00 | ₹5,500.00 | ₹1,26,000.00 |
Projected corpus separates contributed capital from estimated growth
The result reports the starting corpus, total modeled contributions and estimated investment growth separately. Adding those three values reconciles to the projected retirement corpus, subject only to unrounded floating-point precision.
Estimated growth is not an NPS return record or a promise. Changing the assumed return changes the projection rather than predicting a fund outcome.
Return to NPS Explained or review the complete calculator assumptions.
Frequently asked questions
When is each monthly contribution added?
The engine adds it at the beginning of the modeled month before applying that month's return assumption.
How is the monthly return obtained?
The calculator divides the entered nominal annual return by 12. It then uses that constant monthly-equivalent rate throughout the projection.
Does estimated growth represent actual NPS fund performance?
No. It is produced by a constant user-entered assumption and is not current or historical fund performance.
Related guides
retirement
NPS Explained: Contributions, Retirement Corpus and Annuity
How NPS contributions build a projected retirement corpus, how the calculator allocates lump sum and annuity, and where current rules and assumptions matter.
retirement
Why the NPS Calculator Is Not an Actual Pension Quote
Why constant returns, contribution schedules, allocation controls and an assumed annuity rate cannot reproduce an actual NPS account or pension quote.