Capital deployment calculators, built for UK investors.
A growing library of free models for senior professionals modelling after-tax, real-terms returns. No sign-up. No data capture.
Idle Cash Cost Calculator
See what your savings really earn after tax and inflation, and what you forgo by holding rather than deploying.
Open calculator →PropertyUK Property Flip ROI Calculator
Model MAO, capitalised holding costs, and project ROI on a UK refurb-to-resale.
Open calculator →PropertyBuy-to-Let Net Yield Calculator
Gross and net yield with Section 24 tax impact and stress-tested cashflow.
Open calculator →TaxStamp Duty (SDLT) Calculator
Standard, second-home surcharge, and non-UK resident SDLT in one place.
Open calculator →Why these tools exist
Most UK financial calculators answer a single question in isolation: what is inflation doing to my savings, or what is the stamp duty on this purchase. They rarely surface the second-order effects that decide actual outcomes — the interaction between tax band, inflation, and the opportunity cost of staying liquid.
This library models those interactions. Each tool is built to the same standard: transparent methodology, UK-specific tax treatment, no sign-up wall. New tools ship monthly. If there is a model you want to see, tell us.