Calculate your amortisation schedule
Enter the principal, interest and term and see the monthly instalment, the total interest and the full schedule straight away — annuity, straight-line or interest-only.
Nominal annual interest, monthly instalments. With interest-only you pay interest only; you repay the principal at the end in one go.
| Instalment | Opening balance | Interest | Repayment | Instalment amount | Closing balance |
|---|---|---|---|---|---|
| 1 | €25,000.00 | €104.17 | €367.61 | €471.78 | €24,632.39 |
| 2 | €24,632.39 | €102.63 | €369.15 | €471.78 | €24,263.24 |
| 3 | €24,263.24 | €101.10 | €370.68 | €471.78 | €23,892.56 |
| 4 | €23,892.56 | €99.55 | €372.23 | €471.78 | €23,520.33 |
| 5 | €23,520.33 | €98.00 | €373.78 | €471.78 | €23,146.55 |
| 6 | €23,146.55 | €96.44 | €375.34 | €471.78 | €22,771.21 |
| 7 | €22,771.21 | €94.88 | €376.90 | €471.78 | €22,394.31 |
| 8 | €22,394.31 | €93.31 | €378.47 | €471.78 | €22,015.84 |
| 9 | €22,015.84 | €91.73 | €380.05 | €471.78 | €21,635.79 |
| 10 | €21,635.79 | €90.15 | €381.63 | €471.78 | €21,254.16 |
| 11 | €21,254.16 | €88.56 | €383.22 | €471.78 | €20,870.94 |
| 12 | €20,870.94 | €86.96 | €384.82 | €471.78 | €20,486.12 |
| … 60 | €469.90 | €1.96 | €469.90 | €471.86 | €0.00 |
Indicative, based on a fixed nominal annual interest rate and monthly instalments. Not financial or tax advice. In Protiva the instalment invoice runs automatically every month.
Which type suits your loan?
Annuity
A fixed monthly amount; comfortable and predictable. Popular for longer terms.
Straight-line
A fixed repayment, a falling instalment. You shed your interest burden faster.
Interest-only
Interest only each month; you repay the principal at the end in a single final instalment.
Rather not track this yourself? With loans issued, Protiva records the loan, produces the instalment invoice every month and shows the outstanding balance on your dashboard. See the pricing.
Frequently asked questions
What is the difference between annuity, straight-line and interest-only?
With an annuity you pay the same instalment every month; the interest share falls and the repayment share rises. With a straight-line loan you repay a fixed amount every month, so the instalment falls (you pay interest on a lower balance). With interest-only you pay interest only and repay the whole principal at the end in one go.
How is the annuity calculated?
The monthly instalment of an annuity follows from A = P·i / (1 − (1+i)⁻ⁿ), where P is the principal, i the monthly rate (annual rate ÷ 12) and n the number of instalments. This tool uses exactly the same engine as the instalment invoices in Protiva, so the result matches what you see in the platform.
Can I use this for a private or family loan?
Yes. For a private loan it is sensible to agree an arm's-length interest rate and record the arrangements in a deed. Protiva records the loan as a contract, produces the monthly instalment invoice (interest VAT-exempt) and tracks the outstanding balance.
Let Protiva keep track of your loans
Record the loan once — Protiva calculates the schedule, produces the instalment invoice and tracks the balance.