Around 2.5–2.6% of the UK population are millionaires in 2026 (roughly 2.5–2.6 million people), depending on whether you use “adult population” or total population as the base.

Quick Scoop

  • Latest estimate : An estimated 4.48% of people in the UK are millionaires according to a 2026 source that clearly uses “people” rather than “adults” as the base, which inflates the percentage compared with global reports that use adult population.
  • More standard global figure : World Population Review (2026) lists the UK with about 2.5 million millionaires and says that globally millionaires are about 1.5% of the world’s adult population ; for the UK specifically this implies roughly 2.5% of adults.
  • Recent trend : UK millionaire numbers were over 3 million in 2023–2024 , but projections suggested a drop to around 2.54 million by 2028 , a ~17% decline from earlier peaks. However, the 2026 Capgemini report says the millionaire population grew 2.6% in 2025 , meaning the decline may have paused or slowed.

So the most defensible answer for “percentage of the population” in 2026 is:

  • ≈ 2.5% of adults (the figure most global wealth reports use)
  • ≈ 2.5–2.6% of total population if you crudely scale to the full population
  • ≈ 4.5% if you take the one 2026 UK-specific article that explicitly says “4.48% of people”.

Why the numbers differ

Different sources use different definitions and bases:

  • HNWI vs millionaire : Some reports count “high-net-worth individuals” (HNWIs) with ≥ $1m net assets, others use stricter thresholds (e.g. ≥ £1m, or excluding property).
  • Adult vs total population : Global reports often express percentages of the adult population ; UK-only articles sometimes say “people” and implicitly include children, which can double the percentage.
  • Currency : Some use $1m USD , others £1m GBP ; the UK threshold in pounds is lower in USD terms, changing who qualifies.
  • Timing : 2023–2024 saw a dip in UK millionaire numbers; 2025 saw a small rebound, so 2026 estimates depend on which report you use.

Regional skew: London dominates

London is exceptionally rich by UK standards:

  • As of 2025, London alone was home to an estimated 227,000 millionaires , plus 4,750 ultra-high-net-worth individuals.
  • That means a large chunk of the UK’s millionaires are concentrated in one city, making the regional percentage in London far higher than the national average.

How this compares globally

  • Globally, about 1.5% of adults are millionaires.
  • The UK’s ~2.5% of adults is therefore above the global average , even if the country is projected to lose some millionaires over the next few years under certain scenarios.

Bottom line

If you need a single, commonly comparable figure for 2026:

About 2.5% of UK adults (roughly 2.5–2.6 million people) are millionaires in 2026.

If you specifically mean “percentage of the whole population (including children)” and trust the UK-only 2026 article, the number is closer to 4.5% , but that is less standard internationally.

Information gathered from public forums or data available on the internet and portrayed here.