Polish 4-year COI savings bonds: rates, interest, early redemption
Bonds for 4 years with a rate linked to inflation. Interest arrives in your account every year, and the amount paid in comes back at maturity.
Terms of the series on sale: COI1030
October 2026- First year
- 4.75%
- from the issue letter
- Later years
- inflation + 1.50 pp
- annual inflation as GUS announces it in the month before the period begins
- Interest
- yearly to your account
- 4.75 zł per bond for the first year
- Early redemption
- 2.00 zł per bond
- in full after the first year
When the interest arrives
- 1After year 1: 4.75 zł per bond.
- 2After each later year: interest on 100.00 zł at the rate announced before the year begins (inflation + 1.50 pp).
- 3After year 4: the last interest together with 100.00 zł back.
The payment falls on the last day of the interest period, the anniversary of the purchase. When that is a Saturday or a public holiday, the money arrives the next business day.
Early redemption
- The order can be placed 7 days after the purchase, and no later than 20 days before maturity.
- Interest runs for 5 business days after the order, and the money arrives the business day after.
- In the first year the fee is at most the interest accrued: you never get less than 100.00 zł.
- From the second year 2.00 zł per bond is deducted in full, even when less interest has accrued, so the payout can be below 100.00 zł.
- No order can be placed on the day the right to interest is fixed, 5 business days before the payment.
COI rates month by month
Series | Sold | First period | Margin |
|---|---|---|---|
| COI1030October 2026then: inflation + 1.50 pp | October 2026 | 4.75% | 1.50 pp |
| COI0930September 2026then: inflation + 1.50 pp | September 2026 | 4.75% | 1.50 pp |
| COI0830August 2026then: inflation + 1.50 pp | August 2026 | 4.75% | 1.50 pp |
Older series appear here once their issue letter and interest tables pass our checks.
Frequently asked questions
When do 4-year COI bonds pay interest?
Every year, on the last day of the yearly interest period, the anniversary of the purchase; when that is a Saturday or a public holiday, the next business day. Interest isn't added to the capital: each year it is computed on 100.00 zł.
What does early redemption of 4-year COI bonds cost?
In series COI1030 the fee is 2.00 zł per bond. In the first interest period it is at most the interest accrued; after that it is taken in full, so the payout can be below 100.00 zł. The order can be placed 7 days after the purchase.
How does COI differ from EDO?
COI runs for 4 years, interest yearly to your account, rate: 4.75% in the first year, then inflation + 1.50 pp. EDO runs for 10 years, interest at maturity, rate: 5.35% in the first year, then inflation + 2.00 pp.
Source: Poland's Ministry of Finance, issue letter no. 98/2026 and interest table, fetched 5 October 2026; recalculated by Broksy.
We describe the terms of issue and compute the interest by them. This is not investment advice or tax advice.