Tax on £450,000 Savings

£450,000 in savings at 4.5% earns £20,250 interest per year. Tax payable: £3,850 (basic rate), £7,900 (higher rate), £9,113 (additional rate).

With £450,000 in savings at 4.5%, your annual interest is £20,250. This exceeds the Personal Savings Allowance at every tax band. A basic rate taxpayer pays £3,850 in tax, a higher rate taxpayer pays £7,900, and an additional rate taxpayer pays £9,113.

Tax on £450,000 at different interest rates

Rate	Annual interest	Tax (basic)	Tax (higher)	Tax (additional)
3.0%	£13,500	£2,500	£5,200	£6,075
4.0%	£18,000	£3,400	£7,000	£8,100
4.5%	£20,250	£3,850	£7,900	£9,113
5.0%	£22,500	£4,300	£8,800	£10,125
6.0%	£27,000	£5,200	£10,600	£12,150

The Personal Savings Allowance is £1,000 (basic), £500 (higher), or £0 (additional). Interest above the PSA is taxed at your marginal rate.

How to avoid tax on £450,000 savings

With £450,000 in savings, you cannot shelter everything in an ISA in a single year (the allowance is £20,000). But over 23 years of maximum ISA contributions, you could move the full balance into a tax-free wrapper.

In the meantime, prioritise moving your highest-rate savings into ISAs first to maximise the tax saving.

Other strategies to reduce tax on savings interest:

• Use your ISA allowance — £20,000 per year, completely tax-free
• Spread between partners — Each person has their own PSA. If one partner is basic rate (£1,000 PSA) and the other is higher rate (£500 PSA), hold more savings in the basic rate partner's name
• Premium Bonds — Returns are tax-free (prizes instead of interest). Average "prize rate" around 4%
• NS&I products — Some National Savings products offer tax-free returns

At what savings level do you start paying tax?

At 4.5%, the PSA breakeven points are:

• Basic rate (£1,000 PSA): Tax-free on savings up to £22,222
• Higher rate (£500 PSA): Tax-free on savings up to £11,111
• Additional rate (£0 PSA): Tax on all savings interest from £1

Your £450,000 exceeds the basic rate threshold of £22,222, so all taxpayers will pay some tax on the interest at 4.5%.

Tax on other savings amounts

• £430,000: £19,350 interest, £3,670 tax (basic rate)
• £440,000: £19,800 interest, £3,760 tax (basic rate)
• £460,000: £20,700 interest, £3,940 tax (basic rate)
• £470,000: £21,150 interest, £4,030 tax (basic rate)

Frequently asked questions

Do I pay tax on £450,000 in savings?

At 4.5%, £450,000 earns £20,250 interest. A basic rate taxpayer pays £3,850 tax (interest exceeds the £1,000 PSA). A higher rate taxpayer pays £7,900.

What is the Personal Savings Allowance?

The PSA lets you earn savings interest tax-free each year: £1,000 for basic rate taxpayers, £500 for higher rate, and £0 for additional rate. Interest above the PSA is taxed at your marginal rate.

Should I put my £450,000 savings in an ISA?

You should maximise your £20,000 annual ISA allowance. Over 23 years, you could shelter all £450,000 in ISAs.