Calculator
Business loan instalment and affordability: with a rate test
Monthly instalment
30 775 PLN
- Total interest over the term
- 346 488 PLN
- Instalment at a rate 2 pp higher
- 32 241 PLN
- DSCR: EBITDA / annual debt service
- 1,8×
- Capacity at 60 % EBITDA and rate +2 pp
- 1 628 369 PLN
Debt service fits with headroom (DSCR ≥ 1.5). The bank will see the same – you are in a position to negotiate the margin, not just the amount.
The annuity instalment, total interest over the term, debt service against EBITDA (DSCR) and a scenario with the rate two points higher – what the bank will check before answering. For companies, not consumer loans.
An indicative tool: the result is an order of magnitude on your assumptions, not a valuation or tax, legal or investment advice. Data entered into the form is never sent or stored anywhere.
How it is computed
- 1Annuity instalmentR = K × r ÷ (1 − (1 + r)^−n), where r is the monthly rate and n the number of instalments. Total interest = sum of instalments − principal. With a variable rate (reference + margin) the instalment changes every 3 or 6 months – hence the +2 pp scenario.
- 2DSCREBITDA ÷ (12 instalments of the new loan + annual service of other liabilities). A simplification: banks rather use cash flow after tax and capex, but the order of magnitude is the same and every owner has EBITDA at hand.
- 3CapacityThe maximum principal at which the new loan’s service fits within 60 % of EBITDA after other liabilities – computed at a rate 2 pp higher, because the bank does it that way too. An upper bound, not a recommendation: a loan at the limit of capacity is a loan with no room for a weaker year.
Frequently asked questions
What interest rate should I use in 2026?
The reference rate (3M WIBOR) plus the bank’s margin. In early October 2026 3M WIBOR is around 3.85 %, margins for small and mid-sized companies typically 1.5–3.5 pp – so about 5.5–7.5 % in total, depending on security and history. Check the current rate on the GPW Benchmark site.
Declining or equal instalments?
The calculator uses equal (annuity) instalments. Declining instalments start about 15–20 % higher over 5 years but cost less interest in total. For a company with seasonality or a short runway equal instalments are safer; for a company with surplus cash declining ones are cheaper.
Do you help with the bank conversation?
Yes – on the numbers side: a cash-flow model, a thirteen-week cash ledger, a data pack that answers the credit analyst’s questions before they are asked. Raising financing worth many millions of złoty is part of my track record; details on the About page.
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