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Have you noticed that the same calculation gives different results across websites like Groww, Motilal Oswal, or BankBazaar? Here is the exact mathematical breakdown of why others make errors and why our numbers match your real bank statements.
How generic portal calculations compare against official Indian banking standards.
| Financial Tool | Groww & Other Generic Sites | InvestRoutine (Our Website) | The Real-World Difference |
|---|---|---|---|
| SIP Calculator | Ordinary Annuity Assumes investment at month-end | Annuity Due Invested on auto-debit date | Competitors understate your 20-year wealth by ₹75,000 to ₹1,00,000+. |
| Fixed Deposit (FD) | Annual Compounding Uses simplified formula | RBI Quarterly Compounding Compounded 4 times/year | On a ₹10L FD for 5 years, generic calculators miss ₹14,319 in real bank interest. |
| PPF (Public Provident Fund) | Monthly Compounding Compounds balance every month | Min 5th Balance + March 31 Credit Official Ministry of Finance rule | Matches the exact passbook ledger generated by Indian Post Office & SBI. |
| EPF (Provident Fund) | Uncapped 24% Sum Ignores EPS statutory ceiling | EPFO Running Ledger + EPS ₹1,250 Cap Includes annual salary hike modeling | Accurately models the 12% employee vs 3.67% EPF / 8.33% EPS split. |
| Income Tax (FY 25-26) | Outdated ₹50k Std Deduction Incorrect Section 87A rebate math | Budget 2024/25 ₹75k Std Deduction 100% Tax-Free up to ₹7.75 Lakhs | Matches the official Income Tax e-filing portal calculation down to the rupee. |
When you start a mutual fund SIP on the 5th of every month, your funds are deducted on that day. That installment immediately earns returns for that month. Generic tools omit the extra month multiplier *(1 + i), losing 30 days of compounding on every single payment over your entire tenure.
Indian commercial banks (SBI, HDFC, ICICI, etc.) compound cumulative Fixed Deposit interest every 3 months (quarterly). When other websites use annual compounding, your calculated returns will not match the maturity amount printed on your bank deposit receipt.
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