Buying a home involves more decisions than just the mortgage payment — the rent-vs-buy question, upfront taxes, and ongoing costs all factor in. This guide organizes every housing tool on MyCalcKit by which part of the decision it supports.
Should You Buy or Rent?
- Mortgage vs. Rent — the true monthly and long-term costs of each, beyond a simple payment comparison.
- Rent or Buy in 2026 — the real math behind the decision.
- How Much House Can You Afford? — lender affordability rules explained.
Calculating the Mortgage Itself
- Mortgage Calculator — monthly payment, total interest, and amortization.
- 15-Year vs. 30-Year Mortgage — the interest savings versus the higher monthly payment, with a worked example.
- UK Mortgage Rates in 2026 — current trends and what they mean for monthly payments.
Fixed vs. Variable Rate: A Different Trade-off Than Loan Length
Separate from choosing 15 vs. 30 years, most mortgages also require choosing between a fixed rate (locked for a set period, often 2-5 years in the UK or the full loan term in the US) and a variable/tracker rate (moves with a reference rate like the Bank of England base rate or SOFR). A fixed rate gives payment certainty — useful for budgeting and protection if rates rise — at the cost of usually starting slightly higher than a comparable variable rate, and losing out if rates fall after you lock in.
A variable rate typically starts cheaper and benefits if rates fall, but carries genuine payment-shock risk if rates rise significantly during your term. Many UK fixed-rate deals run only 2-5 years even on a 25-30 year mortgage, meaning most borrowers will remortgage onto a new rate multiple times over the life of the loan — the "fixed" period is a much shorter commitment than the loan term itself, which is a common point of confusion for first-time buyers comparing deals.
Upfront and Ongoing Costs
- How Much Deposit Do You Need? — typical requirements by LTV band and first-time buyer schemes.
- What is Stamp Duty? — how it's calculated and who pays more.
- UK Stamp Duty Calculator and Australia Stamp Duty Calculator.
- Council Tax Calculator and UK Council Tax Bands Explained — the ongoing annual cost after purchase.
Common Mistakes
- Forgetting stamp duty and other closing costs when budgeting. These are due in cash at completion, separate from your deposit and mortgage.
- Using gross salary for affordability estimates. Lenders and realistic budgeting should use net (take-home) income, not the headline salary figure.
- Not comparing renting against the fully-loaded cost of owning. Maintenance, insurance, and property tax add 20-40% on top of the mortgage payment alone.
- Assuming a "fixed rate" mortgage means a fixed payment for the full term. Many fixed deals only lock the rate for 2-5 years — the loan term itself is usually much longer, meaning most borrowers remortgage onto new rates multiple times.
Frequently Asked Questions
Where should I start if I'm deciding whether to buy?
Start with Mortgage vs. Rent for the full cost comparison, then How Much House Can You Afford to set a realistic budget before shopping.
What upfront costs am I likely to forget?
Stamp duty (or land transfer tax), which is due separately from your deposit — see What is Stamp Duty for a full breakdown by buyer type.
Should I choose a fixed or variable rate mortgage?
A fixed rate gives payment certainty at a usually slightly higher starting cost; a variable rate typically starts cheaper but carries payment-shock risk if rates rise. The right choice depends on how much certainty you value versus the possibility of a lower cost.
Does a "fixed rate" mortgage mean the same payment for the whole loan term?
Usually not — many fixed-rate deals (especially in the UK) only lock the rate for 2-5 years, even on a 25-30 year loan. Most borrowers remortgage onto a new rate multiple times over the life of the loan.