Sri Lanka Loan Eligibility Calculator

This calculator answers the inverse of the EMI question. Instead of “what is the instalment on a given loan?”, it asks “how large a loan will my income support?” Sri Lankan banks underwrite this in two deterministic steps, and the tool reproduces both exactly.

Step 1 — affordable instalment.Banks cap the share of your net monthly income that can go to all debt repayments combined. That ceiling is the debt-service ratio (DSR), also called “repayment capacity”. There is no single statutory DSR in Sri Lanka; each lender sets its own, typically between 40% and 60% of net income. We default to a conservative 40% and let you adjust it. Your affordable instalment for a new loan is:

A = (net income × DSR) − existing monthly repayments

If existing repayments already meet or exceed the capped capacity, the affordable instalment is zero and so is your eligibility — the tool shows the shortfall instead of a loan figure.

Step 2 — maximum principal. The largest loan that an instalment A can service is the present value of an ordinary annuity — the exact inverse of the universal EMI formula every SL bank uses for reducing-balance loans:

P = A × (1 − (1 + r)⁻ⁿ) / r

where r is the monthly interest rate (annual rate ÷ 12) and n is the tenure in months. For an interest-free loan (r = 0) this collapses to P = A × n. Total repayment is A × n, and total interest is that figure minus the principal. Because this formula is the precise inverse of the EMI formula, every result round-trips: feed the maximum principal back into the EMI calculator at the same rate and tenure and you get your affordable instalment back to the rupee.

The eligibility-by-tenure table re-runs Step 2 at 5, 10, 15, 20 and 25 years for the same affordable instalment, showing how a longer term raises the principal you qualify for while increasing total interest. Interest rate defaults are snapshot figures anchored to the Central Bank of Sri Lanka's weekly AWPLR publication plus a typical product margin; they are editable, not a live feed.

• Central Bank of Sri Lanka — Interest Rates of Commercial Banks (weekly AWPLR / AWLR / AWNLR)
• Bank of Ceylon — Personal Banking Loans (repayment-capacity policy)
• People's Bank — Loan products
• National Savings Bank — housing-loan instalment-to-salary ceilings
• Commercial Bank of Ceylon — Loan products (DSR-based eligibility)

The annuity formula is universal and used by every SL bank for amortised loans. Banks do not publish a single statutory DSR, so the 40% default is the conservative lower anchor of the 40–60% repayment-capacity range across the lenders above. Rate defaults and the DSR assumption were last cross-checked on 2026-06-19.