Tax on £100,000 Savings

£100,000 in savings at 4.5% earns £4,500 interest per year. Tax payable: £700 (basic rate), £1,600 (higher rate), £2,025 (additional rate).

With £100,000 in savings at 4.5%, your annual interest is £4,500. This exceeds the Personal Savings Allowance at every tax band. A basic rate taxpayer pays £700 in tax, a higher rate taxpayer pays £1,600, and an additional rate taxpayer pays £2,025.

Tax on £100,000 at different interest rates

Rate	Annual interest	Tax (basic)	Tax (higher)	Tax (additional)
3.0%	£3,000	£400	£1,000	£1,350
4.0%	£4,000	£600	£1,400	£1,800
4.5%	£4,500	£700	£1,600	£2,025
5.0%	£5,000	£800	£1,800	£2,250
6.0%	£6,000	£1,000	£2,200	£2,700

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 £100,000 savings

With £100,000 in savings, you cannot shelter everything in an ISA in a single year (the allowance is £20,000). But over 5 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

See ISA returns on £100,000 for a detailed comparison.

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 £100,000 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

• £80,000: £3,600 interest, £520 tax (basic rate)
• £90,000: £4,050 interest, £610 tax (basic rate)
• £110,000: £4,950 interest, £790 tax (basic rate)
• £120,000: £5,400 interest, £880 tax (basic rate)

Frequently asked questions

Do I pay tax on £100,000 in savings?

At 4.5%, £100,000 earns £4,500 interest. A basic rate taxpayer pays £700 tax (interest exceeds the £1,000 PSA). A higher rate taxpayer pays £1,600.

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 £100,000 savings in an ISA?

You should maximise your £20,000 annual ISA allowance. Over 5 years, you could shelter all £100,000 in ISAs.