What Britain’s 98% rate actually taxed
The headline rate applied to unearned income—income from investments, such as dividends and interest—not to every pound a person received. It was a marginal rate: it applied to the portion of income in the top tax band, while lower portions were taxed at lower rates.
That distinction changes the arithmetic. If an extra pound of investment income fell within the 98% band, income tax took 98 pence of that pound, leaving 2 pence before any other costs or taxes. It did not mean that a person who earned a pound below the threshold, or even most of a high income, automatically lost 98% of it.
Why investment income faced a higher rate
Britain’s income-tax system distinguished between earnings from work and income from wealth. The top rate on earned income was lower; an additional charge on investment income could push the combined marginal rate to 98%. The policy reflected a view that income from owning assets could be taxed more heavily than wages, especially at the top of the income scale.
The distinction also shaped choices. A person deciding whether to take income as salary or receive it through investments could face very different tax treatment. At such a high marginal rate, keeping additional investment income became less rewarding, giving people with financial options a stronger reason to defer, rearrange, or seek ways to shelter that income. The rate therefore raised a question beyond how much tax the government could collect: how people would respond when almost none of an extra pound remained theirs.
The 98% figure is striking, but its real meaning lies in that narrow slice of income at the top—not a 98% levy on everything a wealthy person earned.
