🇬🇧 英国インフレ計算機

インフレがお金の価値に与える影響を計算し、将来の購買力を予測します。

将来の購買力

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必要金額 — 購買力損失 — 総インフレ —

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UK Inflation Rates and CPI Trends 2025

Consumer Price Index (CPI) inflation in the UK averaged 2.3% in late 2024, down from 11.1% peak in October 2022. Bank of England targets 2% inflation using base rate adjustments—currently 4.75% as of November 2024, down from 5.25% peak. £1,000 today loses 2.3% purchasing power annually at current inflation, requiring £1,023 next year to buy same goods. Over 10 years at 2.5% average inflation, £10,000 today needs £12,801 to maintain equivalent purchasing power, representing 28% loss in real value if money sits in 0% interest account. Historical UK inflation varied dramatically: 1970s averaged 13% annually, 1980s saw 7.4% average, 1990s-2000s stabilized around 2.5%, while 2010-2019 averaged 2.1%. RPI (Retail Price Index) typically runs 0.7-1.0% higher than CPI, used for index-linked bonds and rail fares. CPIH (CPI including housing costs) better reflects actual living costs for homeowners.

Protecting Savings from Inflation Erosion

Real returns (nominal return minus inflation) determine actual wealth growth. 4% savings interest with 2.5% inflation = 1.5% real return. £20,000 earning 4% annually grows to £29,604 after 10 years nominally, but inflation-adjusted purchasing power equals only £23,058 in today's money. Cash ISAs offering 5% currently beat 2.3% inflation by 2.7%, preserving and growing purchasing power tax-free. Index-linked gilts (UK government bonds) adjust principal and interest for RPI inflation—perfect inflation protection but prices fluctuate. Equities historically outpaced inflation: FTSE All-Share returned 5.1% above inflation annually since 1899. Real estate historically tracked inflation plus 2-3%, making property a valuable inflation hedge.

Inflation Impact on UK Pensions and Benefits

State Pension increases annually via Triple Lock: highest of inflation (CPI), average earnings growth, or 2.5%. 2024/25 State Pension rose 8.5% (earnings growth), 2025/26 increases 4.1% (CPI). This protects pensioners from inflation erosion. Benefits and tax thresholds lag inflation creating "fiscal drag." Personal Allowance frozen at £12,570 until 2028 means more people pay tax as wages rise with inflation. Universal Credit rises with CPI (4.1% in 2025/26), maintaining beneficiary purchasing power. Salary increases must exceed inflation to improve living standards—a 3% pay rise with 4% inflation = 1% real pay cut.

Planning for Long-Term Inflation Impact

Compound inflation devastates fixed incomes over decades. At 2.5% annual inflation, prices double every 28 years—£30,000 retirement income today needs £60,000 in 28 years to maintain lifestyle. £500,000 pension pot generating £20,000/year (4% rule) provides equivalent of only £11,800 purchasing power after 20 years with 2.5% inflation, cutting real income 41%. Inflation-proof strategies include: annuities with inflation protection, equity income portfolios naturally growing dividends above inflation, rental property income rising with rent inflation, and phased withdrawal increasing 2-3% annually. Maintain an emergency fund of 6-12 months expenses in a Cash ISA, invest remaining wealth 60% equities / 40% bonds for inflation-beating long-term growth, and rebalance annually.

よくある質問

インフレはどのように計算されますか？

将来価値 = 現在の金額 × (1 + インフレ率)^年数。購買力は現在の金額をこの倍数で割って算出します。

購買力損失とは何ですか？

インフレにより同じお金で買える商品・サービスが減る度合いです。年2.5%のインフレでは10年後に約28%の購買力が失われます。

🇬🇧 英国 インフレ計算機