100,000 PLN to invest - two questions worth asking before picking an account
If you have 100,000 PLN and are wondering where to put it, you are probably worried about two things: whether your money is fully covered by the state deposit guarantee, and whether you might lose a high interest rate by missing a promotional amount threshold. Both questions have concrete, calculable answers - and both differ from what you would hear about smaller amounts. Let's go through them one by one, using only real offers available in September 2026.
How much does the BFG guarantee really cover at 100,000 PLN
The Bank Guarantee Fund (Bankowy Fundusz Gwarancyjny, BFG) covers deposits up to the equivalent of 100,000 EUR per depositor, per bank - this is the EU-wide standard applied in all EU countries. The key word is "equivalent" - the limit is expressed in euro, and its conversion into zloty depends on the current exchange rate.
According to the NBP average exchange rate table No. 184/A/NBP/2026 from 22 September 2026, the EUR/PLN rate was 4.3463. At that rate, 100,000 EUR is roughly PLN 434,630. This is an important caveat: this zloty figure is not fixed - it moves together with the euro exchange rate, so treat it as an approximation valid for that specific day, not a rigid cap.
The takeaway: at 100,000 PLN, you do not need to split your funds
Since the real guarantee boundary sits around 430,000–435,000 PLN, 100,000 PLN fits inside it with an enormous margin - even in a single bank. There is no technical need to split this amount across two institutions "for safety" - you have a buffer of over 330,000 PLN above your amount. Splitting funds between banks only starts to make practical sense as you approach the roughly 430,000 PLN boundary, so at amounts around 300,000–400,000 PLN it is worth planning ahead, since the euro exchange rate can shift that boundary in either direction.
That is good practical news: at 100,000 PLN, you can focus purely on interest rates and promotional terms, rather than on engineering a split of funds between institutions.
Savings accounts: the trap of a threshold just above 100,000 PLN
This is where the second part of the puzzle begins - and it is the one that genuinely needs attention. Many banks offer a promotional rate only up to a set amount, then pay much less on the surplus. At 100,000 PLN this matters directly, because several thresholds among the offers listed on BankSorter end literally just above that figure.
Accounts where 100,000 PLN is almost exactly the limit
- Bank Pekao, Konto oszczędnościowe - 5.7% up to 100,000 PLN, only 0.5% above. Available only to new or inactive customers, requires at least 5 card or BLIK transactions per month, promotion lasts 92 days.
- Crédit Agricole, Rachunek Oszczędzam Plus - 5.5% up to 100,000 PLN, 0.1% above. New customers only, requires opening the savings account together with a personal account, a card and marketing consents; promotion runs for 100 days.
- UniCredit, Konto oszczędnościowe - 4.0% up to 100,000 PLN, 0% above. For new customers, the account must be opened the same day as a personal account.
If you deposit exactly 100,000 PLN into any of these three accounts, the whole amount still falls within the promotional rate - the threshold sits just above it, at 100,000.01 PLN. The problem appears the moment you deposit a bit more: the surplus above 100,000 PLN immediately drops to the base rate, which in practice is near zero (UniCredit - 0%) or symbolic (Crédit Agricole - 0.1%, Pekao - 0.5%). If you plan to top up the account in the coming months, it is worth keeping this in mind from the start.
Accounts with headroom above 100,000 PLN
- Bank Millennium, Konto Oszczędnościowe Profit - 5.25% up to 200,000 PLN (above: 0.5%). Promotion lasts 91 days, applies only to new funds, requires at least 5 transactions per month.
- VeloBank, "New funds on the Flexible Savings Account" - 4.5% up to 400,000 PLN (1.5% between 400,000–1,000,000 PLN, 0% above). For existing customers, applies to new funds, at least 5 transactions per month, promotion 92 days.
- mBank, eKonto oszczędnościowe - 4.1% up to 500,000 PLN (above: 1%). For new customers or new funds, promotion lasts 3 months.
These three accounts offer more comfort - 100,000 PLN fits with a large margin, so even an additional top-up of a few or a dozen thousand zloty will not knock you out of the promotional rate. The trade-off is usually a somewhat lower headline rate than the offers with a tight 100,000 PLN threshold. You can find the full comparison and current terms in the savings accounts ranking.
Term deposits: where the full 100,000 PLN fits into a single product
Not every term deposit in the BankSorter database accepts 100,000 PLN in a single product - some offers have a lower maximum amount limit (e.g. up to 25,000–50,000 PLN), so they are simply not an option for this amount without splitting funds across several deposits. Below are five term deposits where the whole amount fits into a single product:
- Crédit Agricole, Lokata Powitalna - 5.5% for 1 month, amount range 1,000–100,000 PLN. Note: 100,000 PLN is exactly the upper limit of this deposit - it fits down to the last zloty, but not a single grosz more.
- Raiffeisen Digital Bank, Lokata dla Ciebie - 3.7% for 36 months, range 100–1,000,000 PLN.
- Santander Consumer Bank, Lokata Online Nowe Środki - 3.4% for 4 months, range 1,000–400,000 PLN.
- VeloBank, Lokata na Nowe Środki - 3.0% for 2 months, range 1,000–190,000 PLN.
- UniCredit, Lokata terminowa - 2.9% for 3 months, range 1–25,000,000 PLN.
The highest rate among these five comes from Crédit Agricole, but it is the shortest term (1 month) and its amount limit is exactly equal to your 100,000 PLN - with no margin for an extra top-up. If you want to lock in funds for longer while keeping a competitive rate, take a look at Raiffeisen (3.7% for 3 years) - the only deposit of this five with a range reaching a million zloty. You can find the full comparison, including offers that do not fit the whole amount into a single product, in the term deposit ranking.
What to check in the terms and conditions
Almost all the savings account offers listed above share a common pattern: they are time-limited promotions (91–100 days), often reserved for new customers or new funds, and some also require a minimum number of card or BLIK transactions per month (usually 5). If you do not meet these conditions - for example, you transfer funds from another account at the same bank instead of depositing "new" money, or you fail to make the required number of transactions - the bank may not apply the promotional rate at all, regardless of the amount. Always read the promotion's terms before depositing, not just the headline rate.
What you should do
To sum up: at 100,000 PLN, the BFG guarantee is not your problem - it fits inside it with a margin of over 330,000 PLN, so you do not need to split funds between banks. Your real task is choosing an account or deposit whose amount threshold and promotional terms match your plan - especially if you intend to top up the funds later. Compare current offers on the full list of savings accounts with the calculator, and pick a product that will not knock you out of the promotional rate on your first deposit.
Product data verified: 22 September 2026, source: BankSorter offer database.