Your Bonus Landed—Now What?
You've just had money hit your account. Maybe it's a work bonus, an inheritance, a redundancy payout, or savings you've finally accumulated. That lump sum sitting in your current account is probably earning you about 0.5% in interest—if your bank even bothers paying interest anymore. Most don't.
Here's the thing: a lump sum is fundamentally different from regular income. You can't drip-feed it into a bank-switching strategy over months. You can't build a year-long stoozing ladder the way you would with salary. You need to move fast, make smart choices about where that money goes, and lock in the best returns available right now.
This guide walks you through your options, shows you how to compare them for your specific amount, and explains when to use each strategy. No jargon, no generic advice—just how to turn your windfall into as much interest as you can reasonably earn, month one.
Understanding Your Three Main Levers
When you get a lump sum, you've essentially got three core strategies available to you: bank switching, stoozing, and regular savers. The question isn't which one is objectively "best"—it's which combination works best for your money and your timeline.
Bank Switching for Lump Sums
A bank switch bonus is a one-off payment you get for moving your current account (and usually two or three direct debits) to a new bank. The bonus typically sits between £100 and £200, though occasionally you'll see higher offers.
How it works: You apply to switch, the new bank handles the paperwork via the Current Account Switch Service (CASS), and the whole thing completes in seven days. Four to six weeks later, the switching bonus posts to your new account. That timeline is key—you won't see the money immediately, but it's guaranteed once you've completed the switch.
The limit: You can only switch to each bank once. So if you get a £5,000 bonus and there are four decent switching offers available right now, you could theoretically earn £500 in switching bonuses by switching to all four banks—but you've used up four accounts.
Why a lump sum helps: With regular salary, you might not have £500 sitting around to meet the direct debit minimums (usually £1,000+ monthly spend). With a lump sum, you do. You can cover those requirements easily, switch, pocket the bonus, and move the money where it earns interest while you wait for the bonus to post.
Stoozing for Lump Sums
Stoozing is borrowing on a 0% credit card and earning interest elsewhere. Put £5,000 on a 0% card for 12 months and park it in a 4.5% savings account, you're looking at roughly £200–£250 in interest earned.
Why lump sums work well: Stoozing is actually cleaner with a lump sum than with ongoing salary. You've got a fixed pot. You're not juggling spending costs and stoozing repayments. You just need to repay the full balance before the 0% period ends. That's it.
The catch: You need available credit. If your credit limit across all your 0% cards is £3,000 and your bonus is £5,000, you can only stooze £3,000 of it. You'll need to handle the rest separately. And if you're credit-card nervous, stoozing isn't for you—move on to the other strategies.
Real numbers: With a 12-month 0% period and a 4.5% savings rate, a £5,000 stooze nets you about £200. A £10,000 stooze nets about £400. Assuming rates stay where they are and you've got the credit limit.
Regular Savers for Lump Sums
Regular savers sound like they're designed for small amounts (£100–£500 a month), and they are. But here's the hack: if you have a lump sum, you can divide it up and feed it into multiple regular saver accounts, or supplement accounts you're already running.
A regular saver paying 5% headline rate means you're earning £250 per year per £5,000. But that 5% usually assumes you're maxing your monthly deposits. The actual return depends on how much you're depositing each month. A saver with a £5,000 limit at 5% earns interest on an average balance over the year—so if you dump the full £5,000 in month one, you're earning interest on that full amount for 11 months.
Why this matters: If you feed a £5,000 bonus into a £500-per-month regular saver, you're spreading it over 10 months. Interest accrues monthly, so you're earning on a growing balance. It's slower than upfront stoozing or switching, but it requires zero credit cards and zero account juggling.
The Lump Sum Size Matters—A Lot
The strategy that works for a £1,000 bonus is completely different from the strategy for a £20,000 inheritance. Let's talk practical moves for realistic amounts.
£1,000–£2,000: The Small Bonus
At this size, your main play is a single bank switch for £100–£200. You don't have enough credit-card headroom (usually) to make stoozing worthwhile, and regular savers alone would take too long.
The move: Switch your main account, pocket the bonus, and feed the rest into a high-interest savings account or supplement a regular saver you're already running. If you check the latest switching offers and find something with a decent bonus, you've just earned 10% on your money in the first six weeks. That's solid for literally doing paperwork.
£5,000 Windfall: The Sweet Spot
This is where things get interesting. You've got real options now.
Option 1: The Hybrid Approach
- Switch to one or two accounts: earn £200–£300 in bonuses
- Stooze £2,000–£3,000 on a 0% card at 4.5%: earn ~£100–£135 over 12 months
- Feed the rest into a high-interest savings account: earn ~£60–£75
Total expected earnings: £360–£510 over the first year. That's a 7–10% return on a lump sum.
Option 2: Go All-In on Stoozing If you have clean available credit and you're comfortable with 0% periods, stooze the full £5,000. You'll earn about £200 over 12 months. It's simpler, fewer accounts to manage, and you're not juggling timelines.
Option 3: Regular Saver Ladder If you want zero credit cards and don't want to switch multiple accounts, open or supplement two regular saver accounts. You'll earn less (maybe £150–£200 over the year) but you'll have total peace of mind.
£10,000 Bonus: Where Real Strategy Kicks In
Now you've got enough to make multiple strategies sing simultaneously.
The play:
- Switch two accounts (ideally different banks): £200–£400 in bonuses
- Stooze £5,000–£7,000 across two or three 0% cards: earn £225–£315 over 12 months (at 4.5%)
- Feed the remaining £3,000 into a regular saver or high-interest savings account: earn £90–£135
Total expected earnings: £515–£850. That's 5–8.5% on the lump sum.
The key at this level is managing which banks you switch to (you can only use each once) and how you split your stoozing (to stay under credit limits while earning on the full amount).
£20,000+ Lump Sum: The Full Arsenal
This is where you can genuinely get creative.
The play:
- Switch three accounts: £300–£600 in bonuses
- Stooze across three or four 0% cards: earn £450–£600 in interest (at 4.5% for 12 months)
- Feed the remainder into regular savers: earn £250–£350
- Optionally, repeat part of the strategy in three to four months with new stoozing tranches
Total expected earnings: £1,000–£1,550. That's 5–7.75% on the lump sum.
At this level, the limiting factor isn't usually strategy—it's your available credit limits and your own comfort level with juggling multiple cards and accounts.
Real Examples: What People Actually Do
Sarah's £3,500 Work Bonus
Sarah's employer paid a July bonus. She checked her current account (Barclays)—no switching bonus. She checked the live offers and found two decent switching offers worth £150 each.
She applied for one switch immediately and made sure to move £500 of her bonus to cover the direct debit minimum. While waiting for the switch to complete, she opened a 0% credit card and transferred £2,000 onto it, then parked that in a savings account earning 4.5%.
The remaining £1,000 went into a regular saver she was already running.
Her earnings: Switch bonus (£150) + stoozing interest (£90 over 12 months) + regular saver interest (£25) = roughly £265 in the first year. That's a 7.6% return on a bonus, earned passively once the initial setup was done.
Mark's £15,000 Inheritance
Mark inherited £15,000 and wanted to maximise it without stress. He wasn't interested in juggling multiple 0% cards (credit-card anxiety is real, and fair enough). Here's what he did:
He switched his main account to earn a £200 bonus. He opened just one 0% credit card with a £8,000 limit, transferred £8,000, and parked it in a 4.5% savings account. That £8,000 would earn him about £360 over 12 months.
The remaining £7,000 went into a regular saver (£500/month) plus a high-interest savings account.
His earnings: Switching bonus (£200) + stoozing on one card (£180) + regular saver (£175) + savings account (~£140) = about £695 total. Not life-changing, but a 4.6% return for managing money he'd already decided to save.
Gemma's £2,000 Tax Refund
Gemma got a £2,000 tax refund and wanted to do "something smart" with it. She didn't have much credit available—just £1,500 across all cards. She had two options: switch for a bonus or stooze.
She picked the best switching offer available (£150), switched her main account, and then stooze £1,500 on a 0% card. The remaining £500 went into a premium savings account.
Her earnings: Switching bonus (£150) + stoozing (£67) + savings interest (£10) = about £227. Less than Sarah or Mark, but she had fewer options and less credit available. She thought: That's a free dinner. Why wouldn't I do this?
When Not to Use Your Lump Sum This Way
Here's the honest bit: if you've got credit-card anxiety, stoozing isn't for you. Full stop. There's no shame in that. You'll earn slightly less, but you'll sleep better. Regular savers and high-interest savings accounts exist for exactly this reason.
If you're working with borrowed money (a loan you've taken out, not money you own), don't do this at all. Stoozing only works when you're genuinely confident you can repay.
And if you can see yourself spending the bonus on "just a small thing," move it to a fixed-term bond or a savings account where withdrawals are annoying. There's no point earning £200 in interest if you're going to spend £500 on something you didn't need.
The Timeline: How to Actually Execute This
The trickiest part isn't the strategy—it's timing the execution. You can't switch your main account to three banks in one week. Each switch takes seven days. Each bonus posts four to six weeks later.
A realistic 10-week timeline for a £10,000 bonus:
Week 1–2: Research available switching offers. Apply for your first switch. Get a 0% card application in the same week if you're planning to stooze.
Week 3–4: First switch completes. Direct your first stoozing amount (if you're doing stoozing) to a savings account earning 4.5%+.
Week 5–6: Apply for your second switch.
Week 7–8: Second switch completes. Your first stoozing amount is now earning interest.
Week 9–10: First switch bonus posts. You now have the switching bonus plus the stoozing interest already earning on the capital.
Week 11 onwards: Continue earning stoozing interest until the 0% period ends.
It's not instant, but you're fully deployed within eight to ten weeks, and money is actively working across multiple strategies.
Common Questions
How much can I realistically earn from a lump sum? It depends on the amount and current rates. For a £5,000 bonus using a hybrid approach, expect £250–£350 over the first year. For £10,000, expect £500–£700. For £20,000, expect £1,000–£1,500. These numbers assume you're using the live offers and current savings rates. Check right now for what's actually available.
Do I have to use all three strategies, or can I just do one? Do whatever works for you. If you have enough credit and you're comfortable, stooze the whole thing. If you want simplicity, just switch and save. If credit cards terrify you, stick to regular savers. The math is best with a hybrid approach, but the best strategy is the one you'll actually execute.
What if I don't have enough credit limit for the full amount? Split it. Switch some, stooze what your credit limit allows, save the rest in a regular saver or high-interest account. Three strategies on a smaller scale usually beats two strategies on a larger one.
Can I do this multiple times a year? Absolutely. If you get quarterly bonuses or multiple windfalls, stagger your switches (you can only use each bank once, so space them out over time) and rotate stoozing tranches. Just keep track of which banks you've already switched to.
What happens if interest rates change after I've applied? Your 0% period and savings rate are locked in when you apply. If rates drop afterwards, you're protected. If they rise, you can't go backwards, but your money's already earning the rate you accepted. You're still ahead of doing nothing.
Do I need to pay tax on the interest I earn? Only if your total interest across all savings accounts exceeds your Personal Savings Allowance (£1,000 for basic-rate taxpayers). Most lump sum strategies won't hit that threshold, but check HMRC's rules if you're earning substantial interest across multiple accounts.
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