Learn the maths behind your money

Short explainers with worked examples. Every number is computed by the same engine FinPlan uses for your own finances — not a hand-typed figure that can drift out of date.

Investing·4 min

How SIPs actually compound

Why a fixed monthly investment grows, and how much of it is returns rather than your own money.

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Borrowing·5 min

How loan EMIs are priced

Why early instalments are mostly interest, and why prepaying early saves far more than prepaying late.

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Tax·6 min

New vs old tax regime, worked out

The slabs, the rebate, and a complete before-and-after for a salaried earner with a home loan.

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The “show your work” difference

Most finance blogs paste a number and hope it's right. These guides pull their worked examples straight from the same tax, SIP and EMI functions the app uses — so if a slab or a formula changes, the guide changes with it, and the numbers here always match what you'd see inside FinPlan.