Discounted Cash Flow (DCF)

Discounted Cash Flow (DCF) is an investment appraisal method that values an asset by calculating the present value of all its expected future cashflows. The principle is that money received in the future is worth less than the same amount of money today, because today's money can be invested and will grow.

In property investment, DCF analysis involves: projecting all future rental income (minus costs) over the intended holding period; adding the projected sale price at the end of the holding period; and discounting each year's cashflow back to a present value using a chosen discount rate (typically reflecting the cost of capital or required return).

DCF is more commonly used in commercial property valuation and large residential portfolio analysis than in everyday BTL investment decisions, where simpler metrics like gross yield and cashflow are more practical. However, DCF provides a rigorous framework for comparing investments with different cashflow profiles or holding periods.

The limitation of DCF is that it depends entirely on the assumptions made: projected rent growth, vacancy rates, maintenance costs, exit cap rate, and the discount rate. Garbage in, garbage out. Small changes in assumptions produce significantly different valuations.