Why fixed withdrawals underestimate retirement risk
The most common SWP planning mistake: projecting a fixed monthly withdrawal of ₹50,000 for 20 years. The problem is that ₹50,000 today will buy far less in 2045. At 6% inflation:
| Year | Equivalent real value of ₹50,000 (today’s ₹) |
|---|---|
| Year 1 | ₹50,000 |
| Year 5 | ₹37,363 |
| Year 10 | ₹27,919 |
| Year 20 | ₹15,590 |
By year 20, a fixed ₹50,000 withdrawal covers only 31% of today’s ₹50,000 expenses in real terms. The solution is to step up the withdrawal every year at the inflation rate — which is exactly what this calculator models.
How the inflation step-up works
Each year (after the first 12 months), the monthly withdrawal amount increases by the annual inflation rate:
new_monthly_withdrawal = previous_monthly_withdrawal × (1 + inflation_rate / 100)
The calculator applies this step-up at the start of each new year of withdrawals. The fund’s return rate is applied monthly to the remaining balance, then the stepped-up withdrawal is deducted.
Example at 6% inflation starting from ₹50,000/month:
| Year | Monthly withdrawal |
|---|---|
| Year 1 | ₹50,000 |
| Year 2 | ₹53,000 |
| Year 3 | ₹56,180 |
| Year 5 | ₹63,124 |
| Year 10 | ₹84,491 |
Choosing a realistic inflation rate
| Expense profile | Suggested inflation assumption |
|---|---|
| General living costs (urban India) | 5.5–6.5% |
| Healthcare-heavy (senior retirees) | 7–8% |
| Education-dominated (family with children) | 8–10% |
| Conservative / RBI target zone | 4–5% |
India’s CPI averaged 6.1% over the decade 2014–2024. Healthcare inflation has consistently run at 8–10%. Use the higher end if your retirement expenses skew toward medical care.
The real-return framework
A useful cross-check: real return = nominal fund return − inflation rate (approximately).
| Fund nominal return | Inflation | Real return | Verdict |
|---|---|---|---|
| 8% | 6% | ~2% | Corpus grows slowly in real terms |
| 8% | 8% | ~0% | Corpus stays flat in real terms |
| 7% | 8% | ~−1% | Corpus shrinks in real terms |
| 10% | 6% | ~4% | Comfortable buffer |
If the real return is near zero or negative, the corpus will deplete even with a modest withdrawal. A higher-return fund or a lower withdrawal amount is necessary.
Tax treatment
Each SWP redemption is a sale of mutual fund units. For equity-oriented funds:
- Held > 1 year: LTCG at 12.5% (post-23-Jul-2024) on gains above ₹1L per FY
- Held ≤ 1 year: STCG at 20% (post-23-Jul-2024)
Only the gain component (sale price minus cost basis) is taxable — not the full withdrawal. This makes SWP more tax-efficient than bank FD interest (fully taxable at slab rate). Use the LTCG equity calculator to estimate the net post-tax return on your SWP.
Bridges
- SWP calculator (fixed withdrawal) — baseline without inflation adjustment
- SIP calculator — build the corpus you will later draw down via SWP
- Lumpsum calculator — one-time investment growth projection
- Step-up SIP calculator — growing SIP to build a larger retirement corpus
- LTCG equity calculator — tax on equity MF SWP redemptions