Here's the thing about bank switching that nobody really talks about: most people focus obsessively on the bonus and completely ignore what they'll earn in interest on the actual money sitting in the account.
It's a mistake that could cost you hundreds.
You might get a lovely £200 switching bonus from NatWest or Santander right now, but if you're dumping your savings into an account earning 0.1% AER while other banks are offering 4.5%, you're essentially throwing away free money. In May 2023, interest rates are moving in fascinating directions—and the difference between choosing the right account versus the wrong one could mean an extra £100–£300 in your pocket over the next six months.
This is your complete guide to making switching work for both the bonus and the ongoing interest earnings.
Why Your Bonus Is Only Half the Story
Let's start with some hard numbers. Say you switch £10,000 to grab a £200 bonus. Brilliant. That's a 2% instant return just for changing banks.
But here's what happens next: if that £10,000 sits in an account earning 0.5% AER for six months, you'll earn about £25 in interest. Total windfall: £225.
Now imagine that same £10,000 in an account earning 4.0% AER (which several banks are offering right now in May 2023). Over six months, you're looking at roughly £200 in interest. Total windfall: £400.
The difference? £175. That's another switch bonus, essentially—and you barely had to lift a finger beyond choosing the right account in the first place.
Most people optimise for the bonus but leave money on the table with the interest. It's like winning a raffle but forgetting to claim the prize.
The May 2023 Interest Rate Landscape
We're in an interesting moment. base rate trackers have climbed to levels we haven't seen in years, and banks are actually passing some of those increases to savings accounts. It's not universal, but if you know where to look, there are genuinely competitive rates available right now.
Here's what's realistic in May 2023:
Easy-access savings accounts are now offering 4.0–4.5% AER for new customers in many cases. Accounts from smaller or more competitive providers (like digital-only banks) are regularly hitting 4.5%, though some of the "big names" lag behind.
Fixed-rate bonds (if you can lock money away for a year or two) are hitting 5.0–5.5% AER. These are particularly interesting if you know you won't need the money immediately.
regular savers accounts still exist in a weird space—often offering high promotional rates (5–6% on deposits) but with restrictions on how much you can pay in each month. Brilliant if you've got steady spare cash, less useful if you're moving a lump sum.
The crucial thing: these rates are changing rapidly. What's true in May might be different by July. That's why your timing matters.
Strategy 1: Bonus + Flexible Interest (The Safe Bet)
This is what most people do, and it's sensible.
You switch for the bonus (currently £150–£200 across multiple banks), deposit your money, and choose an account that's paying decent interest but isn't locked away. If you need to move the money again during the cooling-off period, or if you change your mind, you're covered.
How to do this:
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Pick a switch offer from our live offers page. Right now, options include HSBC, NatWest, Santander, and Halifax all offering £150–£200.
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Check what savings accounts that bank offers alongside the switch bonus. Many banks offer different savings tiers based on your main account type or balance.
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Look for easy-access accounts within that bank earning 3.5% or higher. Yes, you'll have options—they often have multiple savings products.
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Move your money, grab the bonus (usually credited within 30 days), and earn interest while you plan your next move.
The downside? Easy-access accounts earn less than fixed bonds. The upside? You're not locked in, and you're earning something while you figure out your next switch.
Real example: You switch to Santander for £200, deposit £15,000 into their easy-access saver earning 4.2%, and over six months you earn roughly £315 in interest. Total haul: £515. That's a 3.4% return in six months on your initial deposit.
Strategy 2: Bonus + Fixed Rate (The Optimizer)
If you know you're not touching the money for at least a year, this is where the real money is.
You grab the switch bonus, but instead of (or in addition to) putting money into an easy-access account, you take some or all of it and lock it into a fixed-rate bond for 12 months.
Right now, a one-year fixed bond might pay 5.2–5.5% AER. Lock away £10,000 for a year at 5.2% and you're earning approximately £520 in interest. Add a £200 switch bonus and you're at £720 total—a 7.2% return on your initial deposit.
Where this gets clever: You can do this across multiple accounts. Lock £5,000 in a one-year fixed bond, £5,000 in a two-year bond (paying slightly more), and keep £5,000 in an easy-access account for emergencies. You get the benefit of laddering rates while keeping some flexibility.
The catch: If interest rates fall sharply, you're locked into an "old" rate. If they rise further, you'll wish you'd locked in the higher rate. In May 2023, rates feel like they might be stabilising or falling slightly, which makes fixed-rate bonds attractive—but that's impossible to predict with certainty.
Strategy 3: ISAs and Tax-Free Interest
Here's something that elevates the entire game: ISAs.
If you're using a Flexible ISA, you can deposit up to £20,000 tax-free in the current tax year (ending April 5th was the last reset, so you've got a full year ahead). Any interest earned is completely tax-free, with no tax return required.
- £10,000 in a taxable savings account earning 4.5% = roughly £450 interest, minus tax if you're a higher-rate taxpayer (could be £90 tax bill, leaving £360).
- £10,000 in a cash ISA earning 4.5% = roughly £450 interest, all yours, zero tax.
It's a 20–40% boost just from the tax treatment, depending on your tax band.
The ISA bonus hack: Many banks pay ISA bonuses on top of switch bonuses when you open a new current account. You might get £200 for switching and access to their ISA savings account at a competitive rate. Not all banks do this, but it's worth checking before you switch.
For the current tax year (ending April 4, 2024), you've got plenty of room to utilise your ISA allowance. This is genuinely one of the easiest tax-saving moves available.
Strategy 4: Layering Multiple Switches for Maximum Interest Opportunity
This is where things get sophisticated.
You don't just do one switch. You do multiple switches, staggered, across different banks. Each one comes with a bonus and an opportunity to lock money into interest-earning accounts.
For example:
- May: Switch to Santander (£200 bonus). Deposit £10,000 in their easy-access saver (4.2%).
- Late May/Early June: Switch to NatWest (£200 bonus). Deposit £10,000 in their easy-access saver (4.0%).
- June: Switch to Halifax (£175 bonus). Deposit £10,000 in their fixed-rate bond (5.3% for 12 months).
Over the next six months:
- Santander interest: £210
- NatWest interest: £200
- Halifax interest: (fixed, so counts annually): £265 (pro-rata)
- Bonuses: £575
Total across three switches: £1,250 gross earnings. On a starting pool of £30,000, that's a 4.2% return in six months—all from doing what you'd do anyway, just strategically.
The cooling-off consideration: You must manage cooling-off periods carefully. Most banks require you to wait a certain period (often 30 days) before you can switch away. Plan your switching calendar so you're not sitting idle, waiting for your cooling-off period to end while missing better offers.
The Tax Conversation (Briefly)
Interest on savings is only tax-free if you're within your personal savings allowance. That's £1,000 for basic-rate taxpayers, £500 for higher-rate taxpayers, and £0 for additional-rate taxpayers.
Beyond that, you pay tax at your marginal rate. So if you're earning £1,500 in interest as a basic-rate taxpayer, the first £1,000 is tax-free, and you owe tax on the remaining £500.
This might seem complicated, but honestly, it's worth the maths. Earn an extra £150 in interest and pay £30 in tax? That's still a great trade-off.
Common Questions
Should I switch for the bonus if the interest rate is lower?
Usually yes, but run the numbers. If you're moving £10,000 and the bonus is £200 but the interest rate is 0.5% lower than your current account over a six-month period, you're losing roughly £25 in interest while gaining £200. Easy win. But if it's a savings account you'll keep for two years, that lower rate costs more. Think about how long you'll stay in each account.
Can I use multiple switches to get multiple ISA bonuses?
Technically, you can only open one new account per calendar year that's eligible for a bonus—that's a regulation thing. But different banks have different bonus offerings. Check the fine print. Some banks offer ISA bonuses; others don't. Some offer current account switching bonuses with no ISA element. Layer what's available.
What if rates fall after I lock in a fixed rate?
You're locked in at the rate you agreed to. It's not a problem unless rates fall so far that you wish you'd gone with a lower fixed rate (which is unlikely) or you need the money and can't access it early (which is the whole point of a fixed bond—it's illiquid). Fixed rates are a bet on rates staying stable or rising. If you think rates will fall, stick with easy-access.
Should I be using a regular saver alongside my switching strategy?
Yes, absolutely. Regular savers (often earning 5–6% on monthly deposits) work brilliantly if you've got steady income you can spare. But they only work if you can commit to the monthly deposit requirement. If you're already switching for lump-sum bonuses, pairing that with a regular saver on the side is a genuinely effective way to earn across multiple streams.
Can I get a bonus and still benefit from interest if I'm only moving a small amount?
Of course. The bonus is the same regardless of balance, and interest earnings are proportional to what you deposit. If you're only moving £1,000, you'll earn less interest, but you still get the full bonus. The interest numbers work better with larger sums, but even small amounts add up.
The lesson for May 2023 is this: the bonus gets the headline, but the interest is where the real wealth-building happens. You're not just grabbing free money from a bank switching bonus—you're putting your savings to work at genuinely competitive rates that your High Street account probably isn't offering.
Spend an hour now reviewing our current offers and cross-checking the interest rates available, and you could easily be looking at an extra £200–£400 in earnings over the next six months. That's not a side hustle. That's just good financial housekeeping.
Your future self will thank you.