How Savings Bonus Rates Work for UK Savers Today
A savings bonus rate temporarily adds interest above the ordinary product rate. The correct comparison needs the bonus amount, duration, eligibility and the rate that remains after the promotion.
Separate the base rate, bonus and total promotional rate
Shawbrook's current Issue 5 Bonus Easy Access account combines a variable savings rate with a separate 2.13 percentage point fixed promotional uplift for 12 months. The combined AER is currently 4.13%, while the account's stated follow-on rate after the promotional year is 2.00% AER variable. Read those as three different pieces of information: today's combined return, the temporary uplift, and the rate currently scheduled to remain when that uplift ends.
The provider states that the fixed bonus itself does not change during the promotional period, while the variable part can move. This means the combined headline AER can change even when the bonus remains intact.
Record three numbers when opening: total promotional AER, bonus component and post-bonus AER. If a rate-change notice arrives, those notes show whether the base rate changed, the promotion expired or both.
Think of the bonus as a dated coupon attached to the savings account. The account itself may continue for years, but the promotional layer has its own start date, end date and eligibility test.
A temporary boost can sit on top of a separate variable saver rate
Boosted saver offers can use the same basic structure. A provider can add a temporary uplift to its ordinary variable saver rate for a defined period, then remove the extra percentage points when the promotion ends.
The promotional total is therefore not a permanent description of the account. A saver needs to know both the end date and the ordinary product that remains afterward. Targeted offers can also differ by customer, so the rate shown in the customer's own app or terms is more reliable than an old public screenshot.
If the base rate falls while the boost remains, the combined rate can still fall. Treat the bonus as one layer of the return rather than assuming the headline percentage is fixed for the life of the account.
Targeted boosts should be documented when activated. Save the in-app message or terms because another customer can legitimately have a different boost even though both use the same underlying saver.
Translate the bonus into pounds before deciding whether it matters
The 2.13 percentage point bonus in Shawbrook's current structure is worth roughly £213 over a year on £10,000 if the assumptions remained unchanged. On £2,000, the same uplift is only about £42.60.
This pound conversion shows how urgently an expiry matters. A large balance can lose hundreds of pounds a year after the bonus disappears, while a small balance may lose an amount that is not worth opening another provider relationship for immediately.
Also calculate a competitor's advantage in pounds. A 0.15 percentage point improvement on £5,000 is only about £7.50 a year. Chasing that gap can make less sense than simply preparing for the major bonus expiry.
Use the bonus value to prioritise monitoring. A £200 annual uplift deserves a calendar reminder; a £6 uplift on a small balance may not justify frequent rate checking or a second provider.
Eligibility, balance caps and withdrawal rules can shrink the real bonus
Bonus offers can be limited to new customers, selected customers, new money or a stated balance band. Shawbrook's current Bonus Easy Access account is for new customers. Other boosts can appear only to eligible customers inside an app.
Check whether existing balances qualify, whether the bonus starts on opening or activation and whether withdrawals affect the rate. A 5% headline on only the first £10,000 should not be applied to a £50,000 balance in a worked example.
Linked-account requirements also belong beside the rate. If a current account, saver balance or payment pattern is required to unlock the boost, the benefit should be valued only when that behaviour is realistic rather than manufactured for the promotion.
Balance caps can create a blended return. If only part of the money receives the bonus, calculate the interest separately on the qualifying and non-qualifying portions instead of quoting the top percentage for the whole balance.
Create the exit plan on the same day the promotion starts
The most common bonus-rate failure is inertia after expiry. Put the end date in the calendar and schedule a market review several weeks before it. Record a likely post-bonus destination as well, even if that destination changes later.
When the review date arrives, compare the ordinary follow-on rate with the current easy access and notice-account market. Staying can be sensible if the provider remains competitive; moving is more compelling when the rate drops sharply.
A bonus should have a planned beginning, measurement period and review point. Treating it as temporary from day one makes it less likely that a strong first-year rate turns into a weak long-term return.
Set a reminder before, not on, the expiry date. A short lead time gives enough time to open a replacement account, satisfy identity checks and move the money without spending weeks on the lower follow-on rate.
BankOfferScout editorial view
For How Savings Bonus Rates Work, BankOfferScout treats the balance and period that actually qualify for the displayed rate as the anchor. We compare the outcome around AER, access conditions, balance bands and the time your money can remain deposited, because the largest headline figure is not automatically the feature that matters most in everyday use.
Our second test is resilience: would the choice still make sense after allowing for assuming the headline rate applies to every pound for the full year? That question often exposes the difference between an attractive headline and durable value.
The editorial test for How Savings Bonus Rates Work is whether the choice still works under normal behaviour. The last step is freshness. Confirm base rate, bonus expiry, tiers and post-bonus treatment on the provider savings page, summary box and current savings terms; where a scheme, tax or regulatory rule matters, use the relevant deposit-protection or tax authority as well. The final application, transfer or switch should always use current information.
Sources and related guides
Bonus-rate mechanics were checked on 30 September 2026 against Shawbrook's current summary box. Future reviews should verify the variable base rate, fixed or variable bonus component, customer eligibility, qualifying balance, withdrawal conditions, offer period and post-bonus rate separately. Promotional examples should use the actual qualifying balance rather than the account maximum. The review date should also be refreshed whenever a new product issue or bonus campaign replaces the old one.
Any future comparison should display both promotional and ordinary value. A bonus account that looks strongest in month one can be mediocre in month thirteen, so the post-promotion position belongs in the core analysis.
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