Premium Bonds UK 2026 — Prize Rate, Odds, and Whether They're Worth ItNS&I vs Cash ISA vs Savings Account — Where to Put Your Cash
How NS&I savings, Cash ISAs, and standard savings accounts compare on interest rates, tax, access, and safety. UK comparison guide for 2026.
With Cash ISAs, NS&I products, and high-interest savings accounts all competing for your money, choosing where to save depends on how much you have, your tax rate, and what you need.
Read more: See our Isas guide for a complete overview of this topic.
Quick Comparison
| Feature | NS&I (Premium Bonds) | Cash ISA | Savings Account |
|---|
| Interest/return | Prize fund rate ~4.00% (variable) | 4.0%–5.0% (best rates) | 4.0%–5.2% (best rates) |
| Tax treatment | Tax-free (prizes) | Tax-free (interest) | Taxable (but PSA applies) |
| FSCS protection | No — HM Treasury backed (100%, unlimited) | Yes (£85,000 per banking group) | Yes (£85,000 per banking group) |
| Access | Instant (usually 3–5 working days) | Instant or fixed term | Instant or fixed term |
| Annual allowance | N/A (max £50,000 holding) | £20,000 per tax year | No limit |
| Guaranteed return | No — prizes are random | Yes (if fixed rate) | Yes (if fixed rate) |
| Minimum deposit | £25 | £1 (varies by provider) | £1 (varies by provider) |
The Personal Savings Allowance (PSA)
Before choosing, understand how much savings interest you can earn tax-free.
| Tax band | PSA (tax-free savings interest) | Approx. savings to exceed PSA at 4.5% |
|---|
| Basic rate (20%) | £1,000 | ~£22,000 |
| Higher rate (40%) | £500 | ~£11,000 |
| Additional rate (45%) | £0 | Any interest is taxable |
If your total savings interest stays within the PSA, you pay no tax in a standard savings account. A Cash ISA provides no additional tax benefit in this case — just pick the highest rate.
When Each Option Wins
NS&I Premium Bonds — Best When:
| Situation | Why |
|---|
| You have over £85,000 in savings | HM Treasury backing has no upper limit — safer than FSCS |
| You are an additional rate taxpayer | No PSA — Premium Bond prizes are tax-free |
| You are a higher rate taxpayer with PSA used | Tax-free prizes avoid further tax |
| You enjoy the lottery element | Chance of £1 million prize (very small odds) |
| You want a safe place to park cash | Zero risk of loss |
Cash ISA — Best When:
| Situation | Why |
|---|
| You are a higher or additional rate taxpayer with savings above PSA | All interest is permanently tax-free |
| You want to build a long-term tax-free pot | ISA allowance carries over year to year |
| You are saving for a specific goal over multiple years | Tax-free compounding |
| Cash ISA rate matches or beats savings accounts | No downside vs savings account |
Savings Account — Best When:
| Situation | Why |
|---|
| You are a basic rate taxpayer with under ~£22,000 in savings | PSA covers your interest — ISA not needed |
| The best savings rate is significantly higher than the best Cash ISA rate | More money > tax shelter |
| You want a fixed-term bond with a high rate | Fixed savings accounts often pay more than fixed Cash ISAs |
| You need instant access to a large emergency fund | Easy access savings accounts are flexible |
Rate Comparison (Illustrative — Check Current Rates)
| Product type | Easy access | 1-year fixed | 2-year fixed |
|---|
| Best savings account | 4.5–5.0% AER | 4.5–5.0% AER | 4.2–4.8% AER |
| Best Cash ISA | 4.3–4.8% AER | 4.3–4.8% AER | 4.0–4.5% AER |
| NS&I Premium Bonds | ~4.0% average (prizes) | N/A | N/A |
| NS&I Income Bonds | ~4.0% | N/A | N/A |
| NS&I Direct Saver | ~3.5% | N/A | N/A |
Savings accounts often pay slightly higher rates than equivalent Cash ISAs because they rely on the PSA for tax efficiency rather than ISA wrapper.
Tax Comparison — How Much You Keep
Basic Rate Taxpayer with £20,000 Savings
| Product | Gross interest (4.5%) | Tax | Net interest |
|---|
| Savings account | £900 | £0 (within £1,000 PSA) | £900 |
| Cash ISA | £900 | £0 (ISA tax-free) | £900 |
| Premium Bonds (~4%) | ~£800 (average prizes) | £0 (tax-free) | ~£800 |
At this level, savings account and Cash ISA are equivalent. Premium Bonds return less.
Higher Rate Taxpayer with £50,000 Savings
| Product | Gross interest (4.5%) | Tax | Net interest |
|---|
| Savings account | £2,250 | £700 (£2,250 – £500 PSA = £1,750 × 40%) | £1,550 |
| Cash ISA (£20k) + savings (£30k) | £900 (ISA) + £1,350 (savings) | £340 (£1,350 – £500 PSA = £850 × 40%) | £1,910 |
| Premium Bonds (£50k max) | ~£2,000 (average prizes) | £0 | ~£2,000 |
At this level, Premium Bonds and Cash ISA provide meaningful tax savings.
Additional Rate Taxpayer with £50,000 Savings
| Product | Gross interest (4.5%) | Tax | Net interest |
|---|
| Savings account | £2,250 | £1,012 (£2,250 × 45%) | £1,238 |
| Cash ISA (£20k) + savings (£30k) | £900 (ISA) + £1,350 (savings) | £608 (£1,350 × 45%) | £1,643 |
| Premium Bonds (£50k max) | ~£2,000 (average prizes) | £0 | ~£2,000 |
For additional rate taxpayers, Premium Bonds and Cash ISAs are significantly better.
NS&I Product Range
| Product | Rate (approx.) | Access | Tax treatment | Min/Max |
|---|
| Premium Bonds | ~4.0% (prize fund rate) | Instant (3–5 days) | Tax-free | £25 / £50,000 |
| Income Bonds | ~4.0% (variable) | Instant | Taxable (but uses PSA) | £500 / £1m |
| Direct Saver | ~3.5% (variable) | Instant | Taxable (but uses PSA) | £1 / £2m |
| Green Savings Bonds | ~3.5–4.0% (fixed 3 years) | Fixed term | Taxable | £100 / £100,000 |
| Guaranteed Growth/Income Bonds | ~4.0% (fixed 1 year) | Fixed term (penalty for early withdrawal) | Taxable | £500 / £1m |
Where to Put Savings — Decision Tree
| Your situation | Best option |
|---|
| Basic rate, savings under £20,000 | Whichever pays the highest rate (savings account or Cash ISA) |
| Basic rate, savings over £22,000 | Use Cash ISA allowance first, then best savings account |
| Higher rate, savings under £11,000 | Whichever pays the highest rate |
| Higher rate, savings over £11,000 | Cash ISA + Premium Bonds + savings account (in that order) |
| Additional rate, any amount | Cash ISA (£20,000) + Premium Bonds (up to £50,000) + NS&I/savings for the rest |
| Over £85,000 total savings | Spread across banking groups for FSCS cover, or use NS&I (unlimited Treasury backing) |
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