Three Money Questions Everyone Runs Into — Answered
You don't need a finance degree for these — you need the right formula and two minutes. Here's how to answer them with real numbers, plus a free calculator for each.
"What will my loan EMI actually be?"
Say a bank offers a ₹25,00,000 home loan at 8.5% annual interest over 20 years. The number on the sanction letter is the loan amount — what you actually pay every month is a different figure, and it's not simply the loan divided by the number of months.
Loans use a reducing-balance formula, where interest is recalculated each month on whatever principal is still outstanding. Worked out for this example: the monthly EMI comes to roughly ₹21,700, and over 20 years that adds up to about ₹27.1 lakh in interest alone — more than the loan amount itself. That's the part a lot of people don't fully register until they see it laid out.
The two levers that move this number the most are the interest rate and the tenure. Dropping the tenure to 15 years on the same loan pushes the EMI up to around ₹24,600 — but cuts total interest paid down to about ₹19.3 lakh. Worth running both scenarios before deciding.
"How much of this price is actually GST?"
A freelance invoice or a shop receipt often just shows one final number — say ₹11,800 for a service billed at 18% GST. It's tempting to assume the tax portion is 18% of ₹11,800, but that's not right, because the 18% was applied to the base price, not the final one.
Working backward correctly: base price = final ÷ 1.18, which comes to ₹10,000 — meaning exactly ₹1,800 was GST, split as ₹900 CGST and ₹900 SGST if it's an intra-state transaction. Subtracting 18% of ₹11,800 directly would have given a wrong answer (₹2,124 instead of ₹1,800).
The reverse direction matters just as often — if you're quoting a client ₹10,000 for work and need to know what to actually invoice at 18% GST, the final billed amount is ₹11,800, not ₹10,000 + a rough add-on.
"What will my savings actually grow to?"
Put ₹1,00,000 into a fixed deposit at 7% for 5 years, and the difference between simple and compound interest is bigger than it sounds. Simple interest — calculated only on the original ₹1,00,000 every year — gives exactly ₹35,000 in interest over 5 years, for a final amount of ₹1,35,000.
Compound interest, calculated quarterly (common for many deposit products), instead gives roughly ₹41,000 in interest — because each quarter's interest gets added to the principal before the next quarter's interest is calculated. Same rate, same amount, same time period — a real difference of about ₹6,000 just from how the interest compounds.
This gap widens the longer the money sits and the more frequently it compounds — monthly compounding edges out quarterly, which edges out annual, all at the identical stated rate.
A quick note
These calculators give estimates based on standard formulas. Actual EMI can vary by a lender's processing fees and exact disbursement terms, and applicable GST rates depend on the specific goods or service category — always confirm the final figures with your bank, accountant, or the relevant official source before relying on them for a real decision.
More Calculators
- Percentage Calculator — discounts, increases, and reverse-percentage math.
- Invoice Generator — turn a GST calculation straight into a downloadable invoice.
- Unit Converter — length, weight, and other everyday conversions.