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The Isaac Blog

Practical, jargon-free guides to UK retirement planning — pensions, tax, the State Pension, inheritance, and more.

How safe is my retirement plan? Two ways to stress-test it

Why a projection cannot tell you, sequence-of-returns risk with a worked example, what a 90% chance means, and the four levers that move it.

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The 4% rule in the UK: does it still work?

Where the rule came from, why it travels badly to the UK, why it is too cautious once the State Pension is counted, and four answers from one £500,000 pot.

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Pay off the mortgage or pay into the pension?

Tax relief gives the pension a head start, but the answer is closer than you think. A 20-year worked example, when the relief really decides it, and an order of priorities.

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Retained profits to retirement: pension, dividends, liquidation or sale?

Four doors out of a limited company, what each costs in tax in 2026/27, and a worked example with £1 million.

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Retiring before your State Pension: how to bridge the gap

Size the gap, decide which money to spend first, keep every personal allowance working, and stress-test the years before 67. A worked example with 2026/27 figures.

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How much income tax will I pay in retirement?

What £2,500 a month after tax costs before tax, where the tax-free cash fits, and why a couple pays far less than one person on the same income.

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Pensions and inheritance tax from April 2027

Unused pension funds join the estate from 6 April 2027. Who it affects, the numbers, and the questions to work through before then.

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Planning retirement as a couple: why two pensions are not one plan

Two allowances, two State Pension dates, one spending target. How to plan the household, and what happens to the plan when one of you dies.

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Downsizing to fund retirement: the numbers people forget

Stamp duty, fees, a dearer replacement and timing all eat into the headline figure. A worked example, and what to check before you count on it.

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Should I take my 25% tax-free lump sum?

All at once, a slice with every withdrawal, or not yet. Three worked examples with 2026/27 figures, and the questions that decide it.

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Isaac 6: What’s New

A fresh look, the new “What would it take?” tool, proper support if you’ve already retired, better planning as a couple, Plan history and layouts for every screen.

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How Much Do I Need to Retire in the UK? (2026 Guide)

Retirement Living Standards, pension pot sizes, tax, inflation, and how to work out your personal number. Practical figures for a minimum, moderate, and comfortable retirement.

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UK State Pension Explained: How Much You’ll Get & When (2026 Guide)

Full amounts for 2026/27, how qualifying years work, pension age changes, the triple lock, and how to top up voluntary NI contributions.

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UK Inheritance Tax Explained: Allowances, Rates & How to Reduce Your IHT Bill (2026)

Nil-rate bands, the residence nil-rate band, PETs, taper relief, Business Relief, life insurance, and the 2027 pension change.

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UK Retirement Planning Apps Compared (2026)

What seven UK retirement planning tools cost, where they run and what they model, checked against each provider’s own site. Written by us, so we say where Isaac fits too.

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UK Fiscal Drag Explained: 40 Years of Stealth Tax in One Chart

How frozen income tax thresholds quietly erode real pay — with a data-driven look at how fiscal drag has grown over four decades.

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How Much Do I Really Need to Retire?

A deeper look at the personal factors that shape your retirement number — beyond the standard benchmarks.

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Retirement Planning for Pilots — The Financial Challenge Nobody Talks About (2026)

Mandatory retirement ages, DB-to-DC transitions, tax traps, and why pilots face a uniquely complex financial picture.

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Financial Wellness at Work: Why Employers Should Help Staff Plan for Retirement

The case for offering pension planning as a workplace benefit — the business impact, employee appetite, and how to start.

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