The instinctive advice is always the same: "pay off your debt first." It feels irresponsible to earn interest through stoozing while you owe money. But the actual maths? That's more nuanced. You might be able to do both at once—and come out ahead.
The Core Question: Interest Rate Maths
Stoozing works because you borrow at 0% and earn interest on that money elsewhere. The maths of doing this while carrying debt is straightforward: compare the interest rates.
Example 1: You Have a 3% Personal Loan
- You stooze £5,000 at 0%
- You earn roughly £150/year on a 3% savings rate
- Your personal loan costs you £150/year in interest
- Net position: £0
You're staying flat, not getting ahead. The effort isn't worth it.
Example 2: You Have a Student Loan
- Student loans don't charge interest whilst you're not in repayment, or charge inflation-linked rates
- You can stooze £5,000 at 0% and earn £150–250/year depending on current rates
- No interest accrues on your student loan during this time
- Net position: +£150–250
Now you're ahead. Stoozing makes sense.
Example 3: You Have a 0% Credit Card From Before
- You owe £2,000 on a 0% card with 18 months left on the 0% term
- You stooze £5,000 on a different 0% card earning 3%–4%
- You earn £175–200/year
- Zero interest on either card
- Net position: +£175–200
Stoozing stacks on top. You're earning money for nothing. Check how stoozing works if you're new to the mechanics.
Which Debts Make Stoozing Still Worthwhile?
Good for Stoozing While Owing:
- Student loans (especially if payments are paused or income-based)
- 0% credit cards (with time on the 0% period remaining)
- Mortgages (if you're not in financial stress; they're cheap debt)
- Interest-free overdrafts (if available without penalty)
Bad for Stoozing While Owing:
- High-interest credit card debt (5%–22% APR)
- Payday loans or short-term lending (30%–50% APR)
- Personal loans at 5%+
- Car finance at more than 2%–3%
If your debt costs more than you can earn through stoozing, you're going backwards. The gap gets worse over time.
The Psychological Factor
Even when the maths works, carrying debt while earning interest can feel wrong. This matters more than you might think.
Some people's financial confidence is damaged by visible debt, regardless of interest-rate maths. If you can't sleep because you owe money, paying it down first and then starting stoozing is the better move. Your peace of mind has real value, and it determines whether you'll actually stick to your stoozing plan.
Others are completely comfortable letting 0% student debt sit whilst they earn 3%–4% on a separate chunk of money. That approach works too.
The maths doesn't care about feelings, but your behaviour does. Choose the approach that means you'll actually stick with stoozing, because consistency is what generates real returns.
The Practical Approach: Do Both
If the maths makes sense, here's how to run them in parallel:
Step 1: Separate Your Money Your stoozing money should be physically separate from your debt payoff money. Different accounts help you think about them as different buckets. This isn't just psychology—it prevents you accidentally using stoozing money for living costs, which breaks the whole strategy.
Step 2: Commit to Debt Payoff Just because you're stoozing doesn't mean debt payoff stops. Keep your regular payments on track. Your debt should decrease on schedule. If you can, put stoozing winnings toward debt—this accelerates payoff without eating into your living money.
Step 3: Know Your Payoff Timeline If you're paying off a personal loan in 18 months and stoozing earns you £200/year, you'll earn £300 total before that loan is gone. Is that effort worth £300 to you? Some people say yes; others say no. Only you can decide whether the time investment makes sense.
Step 4: Use One to Accelerate the Other When a stoozing bonus lands, you can direct it toward debt. Bank switching bonuses (typically £75–£200) landing every 3–4 months? That's real money accelerating your payoff, and it doesn't come out of your main income. Check current live offers to see what bonuses are available right now.
Real Example: Starting with £10,000
You have £10,000 of student loan debt (currently interest-free) and £5,000 in savings. You want to both pay down the loan and potentially earn interest.
Option A: Pay Debt Now
- Pay £10,000 toward student loan immediately
- No stoozing income earned
- You're out of the stoozing game for months
- Total earned by end of year: £0
Option B: Stooze While Paying
- Keep £5,000 in a 0% stoozing account earning interest
- Keep paying your student loan as normal (same timeline)
- Earn £150–250/year on the £5,000 through 0% cards and savings
- Continue bank switching for bonuses (£75–200 per switch)
- After 12 months: student loan is lower on schedule, you've earned £200–400, and the stoozing account still has ~£5,000
Option B leaves you ahead financially, and you haven't compromised on debt repayment at all. The time cost matters too—if you stop stoozing to focus on debt, you're out of the game for months and miss switching bonuses that could accelerate payoff.
When Debt Should Come First
Stop stoozing and focus on debt if:
- Your debt is 5%+ interest and you're stressed by it
- You're in a payday loan or high-interest cycle (you need to break it first)
- Your debt has a hard deadline (7-year mortgage fix ending, 0% card expiring next month)
- You're using stoozing as an excuse to avoid dealing with debt psychologically
The exception: if debt is low-interest and you're staying on top of payments, stoozing alongside it is often the smarter move financially. The key is honest self-assessment about whether you're using stoozing responsibly or using it as avoidance.
Your Stoozing ISA Strategy While In Debt
You can stooze in an ISA even whilst carrying debt. The interest is tax-free, which gives you a small advantage.
If you have £20,000 in your ISA allowance and a mortgage or student loan, using even £5,000 of your ISA allowance for a 0% stoozing strategy earns you tax-free interest. Your debt repayment continues normally elsewhere. This is the "stealth stoozing" approach: earn interest in your ISA whilst being responsible about debt elsewhere. See best regular-saver ladder for ISA-friendly stoozing options.
The Motivation Question
Here's something people don't talk about: does stoozing motivate you or demotivate you whilst carrying debt?
For some people, seeing their stoozing account grow (even slowly) gives them confidence. It shows they can manage money. That confidence might spill over into paying debt faster.
For others, watching an account grow whilst owing money feels like cheating. That feeling can derail focus. These people do better paying debt first, then stoozing.
There's no wrong answer. The wrong answer is ignoring how you actually feel and just following someone else's rules.
Common Questions
Should I pay down my mortgage to stooze instead? No. Mortgages are among the cheapest debt available (typically 4%–6% now). If stoozing earns you 3%–4%, you're not coming out ahead enough to justify the complexity. Pay your mortgage normally and consider stoozing only once it's comfortable within your routine.
What if my debt is 0% but about to expire? Plan ahead. If a 0% credit card expires in 8 months and you still owe £3,000, your priority shifts. Stop new stoozing activity and use earnings to pay that debt down before the 0% ends. The interest rate will jump to 18%+ when the 0% expires, making the maths terrible. See 0% card exit strategy for how to plan this transition.
Can I use stoozing bonuses to pay off debt faster? Absolutely. Bank switching bonuses (usually £75–£200) landing every few months are genuinely useful for accelerating debt payoff. Some people run a "half and half" approach: half the bonus to stoozing accounts, half to debt. This keeps stoozing momentum whilst genuinely accelerating payoff.
Is it irresponsible to stooze whilst in debt? Only if the debt is expensive and you're ignoring it. If you're keeping up with payments and the debt is low-interest (student loans, 0% cards, mortgages), stoozing alongside it is financially rational. The issue is expensive debt you're avoiding.
What about psychological debt? If carrying visible debt damages your motivation or confidence, prioritise paying it down first. Your mental health and ability to stick to a plan matters more than earning £200–300/year.