No, NS&I Green Savings Bonds are not tax-free. Interest is paid gross and is taxable as savings income in the tax year the bond matures.1National Savings and Investments. Green Savings Bonds Most savers still pay nothing, because the Personal Savings Allowance shelters the first £1,000 of savings interest for basic-rate taxpayers and £500 for higher-rate taxpayers.2GOV.UK. Tax on Savings Interest: How Much Tax You Pay Whether you owe anything depends on your total savings income across all accounts and your income tax band.
Why the Interest Is Taxable
Some NS&I products genuinely escape income tax: Premium Bond prizes, Direct ISA interest, and Junior ISA interest.3National Savings and Investments. Tax-Free Savings Green Savings Bonds are not on that list. They fund government projects with an environmental focus, but they carry no special exemption. The interest falls under the standard rules for savings income.
NS&I pays the interest gross, meaning nothing is deducted before it reaches you.4National Savings and Investments. Current Interest Rates for Our Accounts That can feel like tax-free money, but it just shifts the responsibility for any tax owed onto you.
How the Personal Savings Allowance Works
Your allowance depends on your income tax band:2GOV.UK. Tax on Savings Interest: How Much Tax You Pay
- Basic-rate taxpayers (taxable income £12,571 to £50,270): up to £1,000 of savings interest tax-free each year.
- Higher-rate taxpayers (£50,271 to £125,140): up to £500 tax-free.
- Additional-rate taxpayers (over £125,140): no allowance.
Anything above your allowance is taxed at your marginal rate of 20%, 40%, or 45%.5GOV.UK. Income Tax Rates and Personal Allowances The allowance is a single pot covering every source of interest, so a regular savings account or another fixed-term bond eats into the same threshold.
Lower earners have a second shelter. If your non-savings income (salary, pension, and so on) is below £17,570, the starting rate for savings applies, taxing up to £5,000 of savings income at 0%. That sits on top of the Personal Savings Allowance, so someone well below the basic-rate threshold can receive several thousand pounds of interest with no tax at all.
The Maturity-Year Trap
Here is where Green Savings Bonds catch people out. Even though the bond earns interest across three years, NS&I confirms it is all taxable in the single tax year the bond matures.1National Savings and Investments. Green Savings Bonds You do not spread the interest across the years you held the bond.
A basic-rate taxpayer investing £50,000 at 3.82% earns roughly £5,900 over three years, all credited at maturity. Add a few hundred pounds of interest from a current account in the same year and the total blows past the £1,000 allowance by a wide margin. Spread evenly at around £1,900 per year, it might have stayed under the allowance entirely.
If you hold multiple bonds, staggering the start dates so they mature in different tax years can keep each year’s interest within your allowance. It is also worth checking whether you can reduce other savings income in the maturity year.
How HMRC Collects Any Tax Owed
NS&I reports your interest to HMRC automatically.6National Savings and Investments. The Common Reporting Standard What happens next depends on how you pay tax on your main income.
If you are employed or draw a pension through PAYE, HMRC usually adjusts your tax code to collect the tax through slightly higher deductions from your pay.7GOV.UK. Tax Codes: Why Your Tax Code Might Change You do not need to do anything, but check the adjustment looks right in a year when a large chunk of bond interest matures.
If you file Self Assessment, include the bond interest in the untaxed UK interest section of your return.2GOV.UK. Tax on Savings Interest: How Much Tax You Pay Anyone earning more than £10,000 from savings and investments in total must file Self Assessment regardless of employment status. If you have exceeded your allowance and have not heard from HMRC by 31 March of the following tax year, contact them yourself to avoid penalties.8GOV.UK. Self Assessment Tax Returns: Penalties
Tax-Free NS&I Alternatives
If tax efficiency matters more than the environmental angle, NS&I offers genuinely tax-free products.3National Savings and Investments. Tax-Free Savings The Direct ISA pays a variable 3.80% tax-free on up to £20,000 per tax year and lets you access your money. Premium Bonds pay no guaranteed return, but any prizes from £25 to £1 million are tax-free, with holdings from £25 to £50,000. The Junior ISA, for children under 18, currently pays 3.70% tax-free on up to £9,000 per tax year.
None of these fund green projects, so if you want your money directed to environmental initiatives, the Green Savings Bonds remain the only NS&I option. The trade-off is straightforward: Green Savings Bonds offer a slightly higher headline rate than the Direct ISA, but the interest is taxable and locked away for three years. For a basic-rate taxpayer whose total savings interest stays within the £1,000 allowance, that often works out in the bonds’ favour. For higher earners or those with large balances, the ISA’s tax-free status and flexible access can deliver a better after-tax return.