Guides & Explainers
101 plain-English guides to mortgages, tax, investing, and debt. Each one paired with a free calculator so you can run your own numbers.
Savings & Investing
Grow your money — compound interest, ISAs, goal-setting, and protecting against inflation.
How Compound Interest Works (and Why Starting Early Changes Everything)
The Rule of 72, the power of time over rate, and why an early starter beats a bigger saver.
Stocks & Shares ISA vs Cash ISA: Which Builds More Wealth?
The £20,000 allowance, long-run return comparison, and when to favour ISA over pension.
How to Work Backwards from a Savings Goal
Four variables, one target: how to calculate the exact monthly contribution you need and which account to use.
US CDs Explained: APY, Penalties, and CD Ladders
How certificate of deposit interest compounds, when early withdrawal penalties bite, and how to build a ladder.
Inflation and Your Money: What It Costs You in Real Terms
Nominal vs real returns, CPI vs RPI, and which assets have historically protected against rising prices.
FIRE Explained: How to Calculate Your Number
The 4% rule, the 25× formula, and a realistic path to financial independence — whatever timeline you choose.
How Bond Yields and Prices Work — and What They Mean for Investors
The inverse price/yield relationship, yield to maturity, duration, and when bonds belong in your portfolio.
ROI Explained: How to Compare Investments on a Like-for-Like Basis
Simple ROI, annualised ROI, and CAGR — with a four-investment comparison showing which metric to use when.
The Power of Dividend Reinvestment: What DRIP Does to Long-Term Returns
Why reinvested dividends have driven most of the FTSE 100's real-terms gain — and how to set it up.
Discounted Cash Flow: How to Value an Investment Using Future Cash Flows
The DCF formula, discount rate, terminal value, and why tiny assumption changes move the output dramatically.
HSA Explained: The Triple Tax Advantage Most People Underuse
Why an HSA beats every other US account on tax treatment, the 2026 contribution limits, and how to use it as a stealth retirement account.
529 Plans Explained: Saving for College the Tax-Smart Way
Tax-free growth, the gift-tax limit, what happens to leftover funds, and the new Roth IRA rollover rule.
Retirement & Pensions
Plan for the future — working out your number, SIPPs, salary sacrifice, and state pension.
How Much Do You Need to Retire? Working Out Your Number
The 4% rule, UK state pension, ISA vs SIPP, and exactly how to calculate your retirement target.
Salary Sacrifice Explained: Is It Worth It?
How salary sacrifice cuts your income tax and National Insurance — and when it makes sense to do it.
The Backdoor Roth IRA: How High Earners Access Tax-Free Growth
The two-step contribution-then-convert process, the pro-rata rule, and the mega backdoor Roth via 401(k).
Required Minimum Distributions: What They Are and How to Plan Around Them
SECURE 2.0 age change to 73, how the IRS formula works, QCDs, and Roth conversion timing.
When to Claim Social Security: How Timing Affects Your Lifetime Benefit
Benefits at 62, 67, and 70 compared — break-even analysis, spousal benefits, and the earnings test.
SIPP vs LISA: Which is Best for Retirement?
Compare the tax relief of a Self-Invested Personal Pension against the 25% government bonus of a Lifetime ISA.
401(k) Explained: Contribution Limits, Employer Match, and How to Maximize It
IRS contribution limits, how employer matching works, and why leaving free match money on the table is the costliest retirement mistake.
Roth IRA Explained: Tax-Free Growth, Contribution Limits, and Withdrawal Rules
How a Roth IRA differs from a Traditional IRA, the 2026 contribution limits, and the rules for withdrawing contributions and earnings.
UK Workplace Pensions Explained: Contributions, Tax Relief, and the Annual Allowance
How auto-enrolment, employer contributions, and tax relief work together — plus the £60,000 annual allowance and the 25% tax-free lump sum.
Annuities Explained: Trading a Lump Sum for Guaranteed Income
Immediate vs deferred annuities, how insurers calculate your payment, and the fees and trade-offs to watch for.
Budgeting & Personal Finance
Take control of your money — emergency funds, net worth, budgeting frameworks, and take-home pay.
Building an Emergency Fund: How Much Is Enough and Where to Keep It
Why 3–6 months matters, what counts as essential expenses, and where to put the money while it waits.
Tracking Net Worth: Why the Number Matters and How to Calculate It
Assets minus liabilities, what to include (pension, property equity), and why monthly tracking changes behaviour.
The 50/30/20 Budget Rule: Does It Still Work in 2026?
Needs, wants, and savings split — and what to do when housing costs already exceed 50% of take-home pay.
What the 2026/27 Budget Means for Your Take-Home Pay
Income tax bands, National Insurance thresholds, and the real impact on your monthly pay cheque.
Tax
Understand what you owe — Capital Gains Tax, Inheritance Tax, Stamp Duty, and student loans.
Capital Gains Tax UK: What You Owe When You Sell
The £3,000 annual exempt amount, 18% and 24% rates, and how to legally reduce your CGT bill.
Inheritance Tax in the UK: How to Work Out What's Owed
Nil-rate bands, the residence NRB, 7-year gifting rules, and strategies to reduce a future IHT bill.
Stamp Duty Land Tax: Rates, Thresholds, and First-Time Buyer Relief
The April 2025 threshold changes, first-time buyer relief, and the buy-to-let 5% surcharge.
Student Loan Repayment in the UK: Which Plan Are You On?
Plan 1, 2, 4, and 5 compared — thresholds, rates, write-off dates, and whether the balance actually matters.
Child Benefit in 2026: Who Gets It and the High Income Charge Explained
2025/26 rates, the HICBC taper from £60k–£80k, and how to use pension contributions to protect your benefit.
VAT in the UK: A Plain-English Guide for Small Businesses
Registration threshold, standard vs reduced vs zero rates, Flat Rate Scheme, and Making Tax Digital.
US Estate Tax: Federal Exemptions, State Rules, and Planning Basics
The $13.99M 2025 exemption, the TCJA sunset risk, portability, and the annual gift exclusion.
US Take-Home Pay: Federal Taxes, State Taxes, and FICA Explained
Understand how your US take-home pay is calculated, including federal tax brackets, state taxes, and FICA.
US Paycheck Withholding: W-4, Federal Tax, FICA, and State Estimates
How W-4 settings, payroll taxes, benefits, 401(k), and state estimates shape each US paycheck.
UK Tax Exile: What It Costs, What You Save, and How to Do It Legally
The Statutory Residence Test, most popular destinations (UAE, Portugal, Monaco), UK CGT on property, and IHT tail risk after leaving.
US Tax Exile: FEIE, Foreign Tax Credits, and the Renunciation Exit Tax
How citizenship-based taxation works, the $126,500 FEIE exclusion, Foreign Tax Credits, and the exit tax calculation for renunciants.
Best Tax Exile Destinations: UAE, Portugal, Monaco, Singapore and More Compared
Income tax, CGT, social security, wealth tax, and cost of living compared across 15 popular destinations — ranked for UK and US expats.
US Sales Tax: How Rates Work and Why They Vary by State
State vs local rates, the five states with no sales tax, and how to back tax out of a total you've already paid.
Tax Refund or Tax Bill? How US Withholding Actually Works
Why your refund changes year to year, the case against a huge refund, and how credits differ from deductions.
Quarterly Estimated Taxes for the Self-Employed: A Complete Guide
Self-employment tax explained, the IRS safe harbor rule, and how to avoid an underpayment penalty.
Mortgages & Property
Navigate the housing market — borrowing capacity, overpayments, buy-to-let, and the rent vs buy decision.
How Much Can I Borrow for a Mortgage in the UK?
Income multiples, affordability stress tests, and what lenders actually look at — with a worked example.
Making Mortgage Overpayments: How Much Interest Can You Save?
The 10% annual limit, how much an extra £200/month saves, and overpay vs invest compared.
Rent vs Buy: The Financial Calculation That Actually Matters
The full cost of ownership, the price-to-rent ratio, and the opportunity cost of a deposit.
Buy-to-Let in 2026: Does the Maths Still Work?
Gross yield, net yield, and cash flow after Section 24 mortgage interest restrictions and the stamp duty surcharge.
How Much Mortgage Can You Afford? The Stress Test Lenders Use
Income multiples, the FCA affordability assessment, and how your payments look if rates rise by 3%.
Should You Refinance? How to Calculate Whether It's Worth It
The break-even formula, closing costs vs monthly savings, and rate-and-term vs cash-out explained.
Remortgaging in the UK: When to Do It and What It Costs
SVR vs fixed rates, ERC timing, LTV bands, and when a product transfer beats a full remortgage.
HELOC vs Home Equity Loan: How to Use Your Home Equity Without Regret
Draw periods, variable vs fixed rates, 80% CLTV limits, and when using home equity makes financial sense.
Rent vs Buy (US): The Full Financial Breakdown
Property tax, HOA, maintenance, opportunity cost of the down payment, and the price-to-rent ratio.
UK Mortgages Explained: Repayment, Interest-Only, and Amortisation
Understand how UK mortgages work, the differences between repayment types, and how amortisation affects your balance.
US Mortgages Explained: PITI, Amortization, and Closing Costs
Learn how PITI forms your monthly payment, how amortization schedules work, and what closing costs to expect.
Airbnb & Holiday Rental Tax: What You Owe HMRC
Holiday-let income is taxable property income — and since April 2025 it's taxed just like standard buy-to-let.
Second Home Stamp Duty: The 5% Surcharge Explained
Who counts as a second-home buyer, the surcharge rates across England, Scotland and Wales, and how to reclaim it if you sell your old home within 3 years.
Mortgage Points: Should You Pay More Upfront for a Lower Rate?
How discount points work, the break-even formula, and when buying points doesn't pay off.
Reverse Mortgages Explained: How HECMs Turn Home Equity Into Cash
Principal Limit Factors, the non-recourse guarantee, upfront costs, and what happens when the borrower passes away.
Debt
Understand and eliminate debt — loan repayments, avalanche vs snowball, and how interest stacks up.
Understanding Loan Repayments: APR, Monthly Payments, and the Total You'll Pay
How amortisation works, what APR really means, and why a longer term almost always costs more.
Snowball vs Avalanche: Which Debt Payoff Method Is Faster?
A side-by-side comparison of two debt elimination strategies, with real numbers showing which saves you more.
Credit Card Debt: How Long Will It Take to Pay Off?
The minimum payment trap, how daily compounding works, and how much faster you clear it with £100 extra per month.
Debt-to-Income Ratio: What Lenders See When They Review Your Finances
Front-end vs back-end DTI, lender thresholds, and how to improve your ratio before applying for a mortgage.
How to Pay Off Multiple Debts Faster
Avalanche vs snowball on a real 4-debt example — which method saves more, and when to consolidate instead.
US Student Loans: Standard, Extended, and SAVE Plans Compared
Compare the 10-year Standard plan, Extended repayment, and Income-Driven Repayment (IDR) options like the SAVE plan.
How Amortization Works: Reading a Loan Schedule Like a Lender
Why early payments are mostly interest, how extra payments compound savings, and how to read your own schedule.
Debt Consolidation: When Combining Debts Actually Saves Money
How to compare your real weighted-average rate against a new loan, and when consolidation backfires.
Business & Self-Employment
Structure your business tax-efficiently — sole trader vs limited company and what it means for your pocket.
Sole Trader vs Limited Company: Which Pays Less Tax?
Corporation tax, dividends, salary, and NI — the full comparison at different profit levels.
Break-Even Analysis: How to Know When Your Business Starts Making Money
Fixed costs, contribution margin, BEP in units and revenue — with a coffee shop worked example.
Understanding Equity Compensation: Options, RSUs, and How to Value Them
ISOs, NSOs, RSUs, vesting cliffs, the 83(b) election, and UK EMI options — all compared with real numbers.
Business Valuation Guide: How to Value a Business Using SDE & EBITDA
Learn how to value a small or medium-sized business using SDE and EBITDA multiples.
What Is EBITDA? A Plain-English Guide to Calculating and Using It
How to build EBITDA from net income or EBIT, why it's not the same as cash flow, and how it's used to value a business.
Everyday Finance
Practical calculations for everyday decisions — car finance, percentages, and household spending.
PCP vs HP: Which Car Finance Deal Actually Costs Less?
GMFV balloon payments, mileage limits, and a full cost comparison on a £25,000 car over 36 months.
Car Budgeting: How Much Car Can You Actually Afford?
The 20/4/10 rule of thumb, gross vs net income budgeting, and estimating the total cost of ownership.
US Auto Loans: Payment, APR, Taxes, Fees, and Trade-Ins
Amount financed, APR, sales tax, fees, rebates, trade-in equity, negative equity, and why loan term matters.
Leasing vs Buying a Car: The Full Financial Comparison
PCH lease vs HP vs cash buy — monthly costs, equity, depreciation risk, and business VAT reclaim.
Percentage Calculations: A Quick Reference for Personal Finance
The three core formulas — X% of Y, X as % of Y, percentage change — with six finance worked examples.
MPG and Trip Cost: How to Calculate Fuel Costs & Travel Expenses
How to budget for road trips: fuel formulas, US vs. UK MPG differences, and how passenger splits affect your wallet.
Margin vs Markup: The Pricing Mistake That Costs Businesses Money
Why a 50% markup isn't a 50% margin, the formulas for each, and how to price to hit a target margin.
Hourly to Salary: How to Compare Pay Across Different Pay Periods
The conversion formulas, why 52 vs 50 weeks matters, and how overtime changes the math.
Crypto & Digital Assets
Understand the numbers behind crypto — DCA, staking yields, and liquidity pool risks.
Dollar-Cost Averaging Into Crypto: Does It Reduce Risk?
DCA vs lump sum in volatile markets — a 6-month Bitcoin example with UK CGT pooling rules.
Crypto Staking APY: What the Yield Actually Means (and What It Doesn't)
APY vs APR, token price risk, slashing, lock-up periods, and UK income tax treatment of staking rewards.
Impermanent Loss Explained: The Hidden Risk of Liquidity Pools
How AMMs rebalance, the IL formula, and why a 2× price move causes ~5.7% loss vs holding.
Crypto Gas Fees Explained: How to Time Your Transactions to Save Money
Understand what crypto gas fees are, why they fluctuate so wildly, and how to use Gwei to time your Ethereum transactions.
Portfolio Rebalancing: How to Manage Risk in Crypto
Discover how to lock in profits, maintain your target asset allocation, and systematically buy low and sell high.
Crypto Mining Profitability: Electricity Costs, Hash Rate, and Break-Even
Understand how electricity costs, network difficulty, and hash rate determine whether a mining rig will ever break even.
Crypto Taxes Explained: Capital Gains, Income, and How to Prepare
Learn the difference between capital gains and income, how trading crypto triggers a tax event, and what you need for tax season.
NFT Break-Even: Calculating Fees, Royalties, and True Profit
Learn how to calculate your true break-even price when flipping NFTs by factoring in marketplace fees, royalties, and gas costs.
Calculator Buying Guides
Choose the right calculator for school, finance, business, technical work, and desk-based bookkeeping.
Primary and Secondary School Calculators: What to Buy in the UK
A practical UK buying guide for primary pupils, GCSE students, and sixth-form maths, with Amazon UK affiliate links and exam-compliance checks.
Scientific Calculators: How to Choose the Right One
A buying guide to scientific calculators for school, university, engineering, and finance, with Amazon UK affiliate links.
Graphing Calculators: When They Are Worth Buying
A UK-focused graphing calculator guide covering exam mode, CAS restrictions, display quality, and Amazon UK affiliate links.
Financial Calculators: TVM, NPV, IRR, Bonds, and Mortgages
A buying guide to financial calculators for accounting, finance courses, mortgages, business analysis, and professional exams, with Amazon UK affiliate links.
Printing Calculators: Adding Machines for Receipts, VAT, and Desk Work
A buying guide to desktop printing calculators and adding machines, with Amazon UK affiliate links for calculators, paper rolls, and ink rollers.
Programmable Calculators: Power Tools for Repeated Technical Work
A guide to programmable calculators for engineering, surveying, finance, and technical workflows, with Amazon UK affiliate links.
Health & Lifestyle
Understand the numbers behind your health — body composition, calorie needs, and fitness metrics.
BMI: What the Number Tells You (and Its Limitations)
The formula, NHS categories, and why BMI misclassifies muscular people and underestimates visceral fat risk.
How Many Calories Do You Actually Need?
Mifflin-St Jeor BMR, TDEE activity multipliers, and how to set a sustainable calorie target for weight loss.
Personal Finance
Big life decisions with a financial lens — care costs, cost of living, and money across borders.
Care Home Funding in the UK: How the Financial Assessment Works
The £23,250 capital limit, tariff income, NHS Continuing Healthcare, and Deferred Payment Agreements.
Cost of Living: How to Compare Cities and Plan a Move Financially
London vs Manchester vs Leeds vs Edinburgh — rent, transport, council tax, and the salary adjustment formula.
How Much Rent Can You Afford? Beyond the 30% Rule
Use gross income, take-home pay, debts, savings goals, utilities, and a cash buffer to choose a sustainable rent.
How Rich Am I? Global and Local Wealth Distributions Explained
Compare your household income and net worth to global and national averages, and understand how percentiles are computed.
Degree vs Apprenticeship: The UK Financial Comparison
Tuition costs, student loan repayments, apprentice wages, and the break-even age that decides which path pays off.
Redundancy Pay in the UK: How Much You're Entitled To
The statutory formula by age and length of service, the £30,000 tax-free allowance, and what to check in a settlement agreement.
Budgeting for a New Baby: What It Really Costs in the First Year
One-off setup costs, monthly essentials, childcare, and the income gap during parental leave — and how to plan ahead for all of it.
Private School Fees: Planning for VAT and Rising Costs
How fee inflation compounds over a school career, the 20% VAT now added to fees, and how much to save each month to keep up.