A 20% reload bonus at 40x costs more than 5% at 10x

A 20% reload bonus carrying 40x wagering is more expensive than a 5% bonus at 10x, once you convert both to the same unit. On a 1,000 PLN deposit the first deal locks 1,200 PLN behind 48,000 PLN of required play; the second locks 1,050 PLN behind 10,500 PLN. The headline percentage flatters the worse deal by a factor of four, and Polish players comparing reload offers by the number in the banner are comparing the wrong number.

The arithmetic is not controversial, which is why it is worth spelling out. Expected loss on a bonus is the playthrough multiplied by the house edge of whatever you play. At 40x on a 1,200 PLN balance, a slot with 3% house edge (97% RTP) costs about 1,440 PLN in expected losses to clear — more than the bonus and the deposit combined. At 10x on 1,050 PLN, the same slot costs about 315 PLN. The 20% bonus is roughly 4.6 times as expensive to clear, and it is the one operators put in the email subject line.

The unit that makes bonuses comparable

The useful measure is expected cost per złoty of bonus received. Divide the expected loss by the bonus amount and you get a number you can rank offers by without opening a spreadsheet.

For the 20% at 40x: bonus is 200 PLN, expected loss at 3% house edge is 1,440 PLN, so the cost is 7.20 PLN per złoty of bonus. For the 5% at 10x: bonus is 50 PLN, expected loss is 315 PLN, cost is 6.30 PLN per złoty. The 5% deal still wins, but by a narrower margin than the raw multipliers suggest — because the smaller bonus is stretched over a smaller base. That gap widens or narrows depending on which game you clear it on. At a 2% house edge the costs fall to 4.80 and 4.20 PLN respectively; at 5% they rise to 12.00 and 10.50. The ranking holds, but the absolute numbers should make you pause: on a 1,000 PLN deposit, both deals are negative expected value before you factor in anything else.

That last point is the one affiliates tend to skip. A reload bonus is not free money with an obstacle; it is a wager you are being paid a small amount to make. Whether it is worth taking depends on whether you would have played that volume anyway.

Where the 40x actually bites

Wagering requirements are usually computed on the bonus alone, but many Polish-facing operators compute on deposit plus bonus. The difference is large. On the 20% at 40x, bonus-only wagering is 8,000 PLN; deposit-plus-bonus wagering is 48,000 PLN — six times more. Always check which base applies, because a 40x bonus-only deal and a 40x deposit-plus-bonus deal are not the same product despite identical marketing copy.

There is also the matter of game weighting. Slots typically count 100% toward playthrough; live casino tables often count 10% or are excluded entirely. If a 40x requirement is cleared on a game weighted at 10%, the effective requirement is 400x. That is not a theoretical edge case — it is the standard structure at several operators that market to Polish players, and it is buried in the terms rather than the banner.

What the Polish market adds

Poland's regulated online casino market is small and recent. Online casino games were added to the state monopoly's offer only in 2023, and the legal landscape is dominated by Totalizator Sportowy's branded sites rather than the international operators whose reload offers dominate affiliate comparison pages. Many of the 20%-at-40x offers Polish players encounter come from offshore operators accepting Polish traffic without a domestic licence — which means the bonus terms are not the only risk. A 40x requirement from an unlicensed operator is not a consumer-protection problem you can escalate to a Polish regulator.

For licensed play, the tax treatment matters too. Polish winnings from licensed operators are subject to a 10% tax on stakes in the case of casino games, collected at source, which changes the effective return on every spin before the bonus is even applied. A 97% RTP slot is not returning 97% to the player in the way a bonus calculator assumes. Any cost-per-bonus figure computed on raw RTP understates the real cost of clearing a bonus in Poland.

That is an argument for treating the multiplier as a first filter rather than the whole calculation. If a 40x deal looks marginal before tax, it is worse after.

The comparison in practice

Take three offers a Polish player might see in the same week:

• 20% reload, 40x deposit+bonus, slots 100%: 1,200 PLN × 40 = 48,000 PLN playthrough. Expected loss at 3% edge: 1,440 PLN. Bonus: 200 PLN. Net expected position: −1,240 PLN against the bonus.
• 5% reload, 10x bonus-only, slots 100%: 50 PLN × 10 = 500 PLN playthrough. Expected loss at 3%: 15 PLN. Bonus: 50 PLN. Net expected position: +35 PLN.
• 10% reload, 25x deposit+bonus, slots 50%: 1,100 PLN × 25 ÷ 0.5 = 55,000 PLN effective playthrough. Expected loss at 3%: 1,650 PLN. Bonus: 100 PLN.

The third offer is the trap that looks moderate. A 25x multiplier reads as gentler than 40x, but the 50% weighting doubles it and the deposit-plus-bonus base inflates it again. On these numbers the 5% at 10x is the only one of the three with a positive expected value, and it is the smallest headline figure on the page.

None of this means reload bonuses are worthless. It means the percentage is a marketing number and the multiplier is a cost number, and the two move in opposite directions often enough that ranking by percentage is close to ranking by the wrong thing. A 5% bonus at 10x is a modest, cheap proposition. A 20% bonus at 40x is an expensive one dressed as a generous one.

The question operators would rather you didn't ask

The obvious follow-up is why the structure persists. Part of the answer is that high-multiplier bonuses are profitable precisely because a meaningful share of players do not clear them — the bonus expires, the balance is forfeited, and the operator keeps the deposit. The 40x requirement is not there to be met; it is there to be almost met. Under Polish rules for licensed operators, bonus terms must be stated clearly, but "clearly stated" and "easy to compare" are different standards, and a 40x clause in paragraph nine of the terms satisfies the first without touching the second.

So the open question is not whether a 20% at 40x is worse than a 5% at 10x — the arithmetic settles that. It is whether regulators will ever require the cost-per-bonus figure to appear next to the headline percentage, the way APR must appear next to an interest rate. Until they do, the comparison is left to players who are willing to do the multiplication, and the operators are counting on most of them not bothering. If you are going to take a reload anyway, set a deposit limit before you claim it and treat the playthrough as the price of the ticket, not a challenge to beat.