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Keystone

Answers

Questions buyers and investors ask, answered with worked numbers you can open in the calculators.

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Each answer starts from a question people search for, gives the short answer first, then works it through with the same math as our calculators. Rules from lenders and regulators are quoted from their own pages and listed as sources. Every worked example opens in the matching calculator, so you can swap in your own numbers.

How we source and review what we publish is in our editorial policy. Spotted a mistake? Tell us.