Rotating Savings Plan Calculator
No interest, just a flat fee — the math for tanda, sou-sou, ROSCA, and savings-finance home plans.
A rotating savings plan pools fixed contributions from every member, then allocates the full target amount to one member at a time — by lottery, by savings order, or by a fixed schedule — until everyone has received their turn. Known internationally as a ROSCA, tanda (Latin America), sou-sou (Caribbean), chit fund (South Asia), or as licensed "savings-finance" companies for home and vehicle purchase in Turkey, the structure is interest-free by design: the only cost is a flat organization or service fee, not compounding interest.
Rotating savings plans (also called ROSCA, tanda, sou-sou, or — for home/vehicle purchase specifically — 'savings-finance' companies in Turkey) charge no interest: members contribute fixed installments toward a shared pool, and each member's turn to receive the full target amount (either by lottery or by savings/time order) is allocated from that pool. The only cost is a flat organization/service fee — no interest, no compounding. This fee percentage is set by the provider, not a universal rate — confirm it against your own offer.
How to use
Enter the target amount
The full amount you'd receive when it's your turn — a home down payment, vehicle price, or savings goal.
Enter the organization fee and installment count
The flat fee percentage your provider charges (not a universal rate — check your offer) and the number of monthly installments in the plan.
Compare the annualized fee rate
The calculator spreads the flat fee over the plan's length as a rough annual percentage — useful for comparing plans of different durations, or against a conventional loan's interest rate.
Frequently asked questions
- Is this the same as a loan?
- No. A loan pays interest that compounds over the outstanding balance. A rotating savings plan charges one flat fee, set once, regardless of how the pool is used — there's no compounding and no separate 'interest rate' to negotiate.
- How does the payout order get decided?
- Two common models: lottery-based (a draw each period determines who's allocated next) and savings/time-based (allocation happens once you've met a savings-and-tenure threshold, in a pre-agreed order). Rules vary by provider.
- Does the calculator store my numbers?
- No. Everything stays in your browser.