Commuted Pension: How Much Lump Sum You Get, and What It Really Costs You
When I retired as a UDC after 32 years, the single biggest decision on my superannuation form was the commutation percentage. Do I take the maximum 40% as a lump sum, or keep my pension whole? Nobody in my office could give me a straight answer on what it actually costs to commute — they only talked about the tax-free cash. So I sat down with the commutation table and worked it out cell by cell. This page is that same working, made into a calculator.
Commutation lets you exchange up to 40% of your monthly basic pension for a one-time, tax-free lump sum at retirement. The catch nobody explains clearly: you keep receiving Dearness Relief on your full pension the whole time, and the commuted portion is restored after 15 years. Whether it's a good deal depends entirely on your age at retirement and what you'll do with the money.
What commutation actually is
Commutation is the government buying back a slice of your future monthly pension in exchange for cash today. You surrender a percentage of your monthly basic pension for 15 years; in return you get a lump sum now. After 15 years, the surrendered slice is handed back and your full pension resumes automatically — no application needed.
Three numbers drive the whole calculation:
- Basic pension — 50% of your last drawn basic pay (or the average of your last 10 months, whichever is higher).
- Commutation percentage — how much of the basic pension you choose to commute, capped at 40% for civil Central Government pensioners.
- Commutation factor — a multiplier from the official table, based on your age at your next birthday. Younger retirees get a higher factor (they surrender pension for longer), older retirees get a lower one.
The formula
The lump sum is deceptively simple:
Lump sum = Commuted monthly pension × 12 × Commutation factor
So if your basic pension is ₹50,000 and you commute the full 40% at age 60 (factor 9.124):
- Commuted monthly pension = 40% × ₹50,000 = ₹20,000
- Lump sum = ₹20,000 × 12 × 9.124 = ₹21,89,760
That ₹21.9 lakh is fully tax-free under Section 10(10A)(i). Your monthly pension drops to ₹30,000 basic — but, and this is the part everyone misses, your Dearness Relief is still computed on the full ₹50,000, not on ₹30,000.
The commutation factor table
The factor depends on age at next birthday. These are the values built into the calculator above:
| Age at next birthday | Commutation factor |
|---|---|
| 56 | 9.598 |
| 57 | 9.483 |
| 58 | 9.366 |
| 59 | 9.246 |
| 60 | 9.124 |
| 61 | 9.000 |
| 62 | 8.873 |
| 63 | 8.744 |
| 65 | 8.476 |
| 68 | 8.038 |
| 70 | 7.713 |
Notice the factor falls as age rises. A voluntary retiree at 56 gets 9.598; someone superannuating at 60 gets 9.124. The younger you are, the more months of pension you're surrendering, so the government pays you more up front per rupee commuted.
Is commutation a good deal? The 15-year break-even
Here is the honest arithmetic I did for myself. At a factor of 9.124, you receive roughly 9.124 years' worth of the commuted pension as a lump sum, but you give up that slice for 15 years. On the face of it you "lose" about 5.9 years of the commuted amount.
But that ignores three things in your favour:
- The lump sum is tax-free, and you get it today — the time value of money matters.
- DR keeps accruing on your full pension, so the effective cost is only the basic slice, not the DR on it.
- If you invest the lump sum even conservatively (say a Senior Citizen Savings Scheme at ~8%), the returns can offset most of the surrendered pension.
The rough internal rate of return on commutation works out to around 8–9% for a retiree at 60. If you can reliably beat that with the lump sum — or if you have an immediate need (clearing a home loan, a child's wedding, medical corpus) — commutation makes sense. If you'd just leave the cash in a savings account, keeping the full pension is usually better.
What restoration means
Fifteen years after commutation, the surrendered slice is restored automatically. From the 16th year, you're back to your full basic pension. You do not need to apply — the pension-disbursing bank restores it on the anniversary date. Keep the commutation sanction order safe; occasionally banks miss the restoration date and you have to nudge them with that document.
If you commute at 60, restoration happens at 75. Given the enhanced family-pension and old-age additions that kick in later (20% extra at 80, 30% at 85, and so on), the full-pension years at the end are worth protecting.
Civil vs defence commutation — a key difference
Civil pensioners can commute up to 40%. Defence personnel can commute up to 50% of pension, and their commuted value is likewise tax-free. If you're from the armed forces, use the Defence Pension Calculator instead — it applies the 50% cap and the same factor table.
Common mistakes I've seen colleagues make
Commuting the maximum by reflex. 40% is a ceiling, not a target. If you don't have a concrete use for the cash, a smaller commutation keeps more monthly income for life.
Forgetting DR is on the full pension. People assume their whole pension shrinks. It doesn't — only the basic slice does. Factor this in before deciding commutation is "too expensive."
Ignoring the restoration date. Mark 15 years ahead in your records. Restoration is automatic in theory but banks slip up.
Confusing commutation with gratuity. They're separate retirement benefits. Commutation is optional and comes from your pension; gratuity is a statutory payout of (Basic+DA) × 15/26 × years. You get both.
Worked examples
Full 40% commutation at superannuation (age 60)
Commuted monthly pension = 40% × ₹50,000 = ₹20,000
Lump sum = ₹20,000 × 12 × 9.124 = ₹21,89,760 (tax-free)
Reduced monthly pension for next 15 years = ₹50,000 − ₹20,000 = ₹30,000 basic — but Dearness Relief is still paid on the full ₹50,000.
At 60% DR, DR = ₹30,000 → total in-hand = ₹30,000 + ₹30,000 = ₹60,000/month during the commutation period.
After 15 years (age 75), pension is restored to the full ₹50,000 basic + DR.
Voluntary retiree at 56 vs superannuation at 60 — same ₹40,000 pension
Scenario A — retire at 56: Lump sum = ₹16,000 × 12 × 9.598 = ₹18,42,816
Scenario B — retire at 60: Lump sum = ₹16,000 × 12 × 9.124 = ₹17,51,808
The earlier retiree gets ₹91,008 more lump sum for the same commuted amount — because they're surrendering the slice for longer (restoration at 71 vs 75). The higher factor compensates for the longer surrender period.