How to Calculate Monthly Savings for Any Target Goal
A savings goal calculation works in reverse of a traditional SIP: instead of asking "How much will ₹10,000 become in 5 years?", it solves "How much must I invest each month starting today to have exactly ₹10,00,000 in 3 years?".
Because mutual fund SIPs and bank auto-debits transfer money at the beginning of each monthly billing cycle, money compounded from day 1 earns an additional month of compound interest (an Annuity Due structure).
The Reverse SIP Annuity Due Formula
Remaining Target = Target - [Current Savings × (1 + r)^n] Monthly Savings (M) = [Remaining Target × r] / [(1 + r) × ((1 + r)^n - 1)]
Where r is the monthly expected return rate (Annual Rate / 12 / 100) and n is total duration in months (Years × 12).
Worked Example: ₹10,00,000 Down Payment in 3 Years
- Target Milestone: ₹10,00,000
- Current Seed Savings: ₹1,00,000
- Time Horizon: 3 Years (36 Months)
- Expected Annual Return: 10% p.a. (Balanced Advantage / Aggressive Hybrid)
- Current Savings Future Value: ₹1,00,000 × (1 + 0.10)^3 = ₹1,33,100
- Required Monthly Deposit: ₹20,771 / month
- Total Self Invested: ₹1,00,000 (initial) + ₹7,47,756 (deposits) = ₹8,47,756
- Estimated Wealth Gain from Compounding: ₹1,52,244
By investing systematically rather than keeping cash in a standard 3% savings account, compounding pays for over ₹1.5 Lakhs of the down payment.
Asset Allocation Guide by Time Horizon
| Goal Tenure | Recommended Vehicle | Realistic Return Expectation | Capital Risk |
|---|---|---|---|
| < 1 Year | Liquid Mutual Funds, High-Yield Savings, FDs | 6.0% - 7.0% | Near Zero |
| 1 to 3 Years | Short Duration Debt, Bank Recurring Deposits, Arbitrage Funds | 7.0% - 8.0% | Very Low |
| 3 to 5 Years | Equity Savings Funds, Conservative/Balanced Advantage Funds | 9.0% - 11.0% | Moderate |
| 5+ Years | Flexi-Cap Equity, Large & Mid-Cap Mutual Funds, Index Funds | 12.0% - 13.5% | Volatile in short term, high long-term return |