What a 100% deposit bonus credits, in pounds

A 100% deposit bonus is the plainest match in the market: the operator credits bonus funds equal to the deposit, so a £100 deposit arrives with £100 of bonus money beside it and £200 in playable balance in total. The percentage is the honest part of the deal. Everything that decides whether the deal is worth taking lives in the four numbers that follow it: the wagering multiple, the base the multiple applies to, the ceiling on the matched amount and the expiry clock.

One deposit runs through this page: £100, doubled to £200. That sits in the middle of the bracket, where minimum deposits at the offshore end of the market typically run £10 to £20 and the matched welcome offer is the standard shape of a promotion. At 100% the match itself is a one-line sum, bonus equals deposit, which is precisely why scrutiny belongs elsewhere: the percentage has no work left to do, so the cost hides in the conditions attached to it.

The fence between the two balances matters more than the percentage. The deposit stays cash and can usually be withdrawn, though pulling it out early commonly forfeits the bonus alongside any winnings it has produced. The matched £100 is bonus money: it cannot be withdrawn until the terms are satisfied, and while it sits locked the wagering clock runs. Read the arrangement as a commitment rather than a gift. The operator has added £100 of playing balance and attached a turnover bill to it.

The turnover ladder at 40x on the bonus

Wagering multiples on bonuses at this end of the market typically run 25x to 50x, most commonly 35x to 45x, and for the worked model we take 40x, because that is what this part of the market asks. Applied to the bonus only, 40x on the modelled £100 means £4,000 of qualifying stakes before the bonus balance and anything won with it converts into withdrawable cash. That figure, not the headline percentage, is the true price tag of the match.

The ladder scales in a straight line, which is the one merciful feature of the arithmetic. Every £10 of matched bonus at 40x carries £400 of turnover, so the chart below reads as a rate card: £2,500 at 25x, £3,000 at 30x, £3,500 at 35x, £4,000 at 40x, £4,500 at 45x and £5,000 at 50x on the modelled bonus. The copper bar marks the 40x used across the rest of the page.

Turnover counts stakes, not losses. Working through £4,000 does not mean parting with £4,000; it means spinning or dealing until the staked total reaches that figure, with the balance ebbing and flowing around an assumed rate of return. The honest reading of £4,000 is as the admission price to your own bonus: the longer the ladder, the more of the deposit's value is consumed simply by moving along it.

Deposit plus bonus against bonus only

The single term with the greatest effect on the bill is the base the multiple applies to. On the bonus alone, 40x on the modelled match asks £4,000. On deposit plus bonus, the same 40x lands on £200 and the bill doubles to £8,000. Nothing in the headline moves: the percentage still reads 100% and the credited amount is unchanged, but the work required to release the money has doubled.

This is why the base belongs in the same sentence as the multiple. A 35x requirement applied to deposit plus bonus asks £7,000 on the modelled figures, which is heavier than a 50x requirement on the bonus alone at £5,000. Reading the multiple without the base is like reading a price without checking the currency, and the confusion is not rare: both bases appear across the market, and the terms rarely announce the difference in bold.

A practical habit follows. Before opting in, rewrite the offer as one sentence with the bill included: deposit £100, receive £100 bonus, wager £4,000 on the bonus or £8,000 on the pair, then judge. The sentence takes twenty seconds to write, and it strips the headline of its decorative charm, because a percentage without a base is not a term at all.

The cap that flattens the percentage

The ceiling is the term that quietly rewrites the percentage. A match advertised at 100% usually carries a maximum bonus amount in the same paragraph, and once a deposit clears that maximum the advertised rate stops applying. On the modelled terms the ceiling sits at £200, chosen because it is a plausible figure for promotions in this bracket rather than a quote of any single offer: a £200 deposit takes the full match, while £300 and £500 deposits receive the same £200 of bonus.

Divide the bonus actually credited by the deposit actually made and the effective match appears: 100% up to the ceiling, then 67% at £300, 40% at £500 and 20% at £1,000. Past the cap the percentage is costume. The offer becomes a flat £200 bonus whose generosity shrinks as the deposit grows, and the wagering on the credited bonus runs at the full multiple regardless of how much of the deposit went unmatched.

The flattening is less a trick than a misreading risk. A reader who deposits £500 expecting £500 of extra balance has taken a larger position than the terms support, and the turnover attached to the bonus received still runs at the full rate. The table below sets the model out row by row, with the assumptions stated directly under it.

Expiry and the pace it forces

Every match carries a clock, and the model gives the player 30 days to clear the ladder. That is a working assumption rather than a quoted term: windows in the market run shorter and longer, and the operator's own terms govern. Thirty days divides £4,000 of turnover into £133 a day, every day, for a month, which is a demanding pace for anyone who plays in sessions rather than marathons.

Shorten the window and the pace sharpens quickly. A 14-day expiry asks £286 a day on the modelled bonus. A 7-day expiry asks £571 a day, which at £1 a spin is about 570 spins daily and at £2 a spin more than 280. When the clock runs out, the bonus and any winnings attached to it are typically forfeited, so the expiry decides whether the ladder is climbable at a sensible stake rather than merely existing as fine print.

Pace also depends on what counts towards the ladder. Terms commonly weight games differently, with slots contributing in full and table games contributing little or nothing, so the practical speed of the climb follows the games the reader actually plays. Where the terms stay silent on weighting, the silence is information, and the question belongs before the deposit rather than after it.

The four numbers to read before opting in

Four numbers decide the cost of any matched deal: the multiple, the base, the ceiling and the clock. All four sit in the promotion's own terms, usually within a few paragraphs of one another, and none of them appears in the headline percentage. A reader who can quote all four can cost the offer in a minute with the calculator near the foot of this page.

Ranked by the damage they do when misread, the base comes first, because it can double the bill without altering a single printed figure. The ceiling follows, because it flattens the percentage on everything above it. The multiple sets the slope of the ladder. The clock decides whether the climb fits the reader's actual habits: someone who stakes £20 a session cannot clear a £4,000 ladder in a fortnight, and the terms will not bend to accommodate them.

Qualification rules sit around the edges of the four. Minimum deposits at this end of the market typically run £10 to £20, with low-deposit offers at £5 and smaller floors on particular rails. Some terms pay a reduced percentage, or spins instead of the match, below a threshold, and some restrict the offer by payment method, so the deposit rail deserves a glance before the deposit is made rather than a dispute afterwards.

The British baseline, table by table

The comparison table below sets eight UK-licensed operators beside four offshore ones, drawn from the wider market rather than from any shortlist, and the British rows are the baseline. They show what a welcome offer looks like when a Gambling Commission licence stands behind it: debit-only rails, verified games, a self-exclusion scheme that reaches the operator and a dispute route with teeth.

The ranges are category-typical rather than quotes. Sportsbooks show free bets with light turnover requirements; casinos show matched deposits with 30x to 40x ladders; the offshore rows show the same broad shape of deal at the same class of multiple, minus the licence and everything the licence carries. No row is a claimable promotion, and the offshore figures belong to operators outside the British regulatory perimeter.

One structural difference shows in the rails column. British rows list debit cards, PayPal and the other licensed rails, and never credit cards, because the British ban binds licensees. Offshore rows may list credit cards and crypto alongside, which is not a footnote but part of what the licence gap means in practice: the protections stop at the licence, and so does the ban.

What a UK licence would have bought you

Providing remote gambling facilities to a consumer in Great Britain without a Gambling Commission operating licence is an offence under the Gambling Act 2005. The offence has a mirror image for the reader: every protection in the British system attaches to the licence, so an operator without one carries none of those protections onto its site, however polished the lobby looks.

A licensed operator must verify age before allowing play and must run the identity checks that anti-money-laundering rules require. It must offer the tools that catch harm early, from deposit limits to the national self-exclusion scheme, Gamstop, whose minimum terms of six months, one year or five years cannot be cut short once they start. It must also give its customers access to an approved dispute resolver, IBAS among them, so a disagreement over a withheld withdrawal has somewhere independent to go.

The licence shapes the money itself. Credit cards are banned for gambling with British licensees, online and offline, a rule with no force over operators beyond the Commission's reach, which is why credit cards resurface in offshore rails. Player winnings are not taxed in the UK; the operator's contribution arrives as Remote Gaming Duty at 21% of gaming yield, legislated to rise to 22% from April 2027. An offshore operator pays what its own jurisdiction asks, and none of it funds the British system the player would otherwise fall back on.

Offshore licence claims, most commonly Curaçao ones, are made in the operator's own footer, with a master licence holder on the island sitting behind them. The sensible posture treats every such claim as unverified until a register lookup confirms it. Where no register entry exists, the honest account is a list of absences: no Gamstop, no IBAS, no Commission to complain to, and none of the payment and identity protections a British licence requires.

Cost it yourself

The calculator takes the numbers that matter and returns the bill: deposit, match percentage and wagering multiple, with the base switchable between bonus only and deposit plus bonus. It arrives prefilled with the page's model, £100 at 100% and 40x on the bonus, so the default output matches the figures used across this page.

Change one input at a time and the sensitivity shows itself. Moving the base to deposit plus bonus doubles the turnover at a stroke. Halving the deposit halves both the bonus and the bill. Raising the multiple to 50x adds £1,000 to the ladder on the modelled bonus. The arithmetic is a costing tool, not a prediction of what any session will return, and the operator's own terms override every assumption here.