InterestRate

InterestRate represents a constant or piecewise term-structured interest rate curve used for discounting actuarial cash-flows. It supports:

• Constant rates: a single effective annual rate \(i\).

• Piecewise curves: segment rates \(i_1, i_2, \ldots\) with durations \(t_1, t_2, \ldots\) (the last rate applies indefinitely).

• Multi-scenario containers: a named set of constant or piecewise curves with an active-scenario switch for stress testing.

Discount factors \(v^n = (1+i)^{-n}\) are computed via vn() (direct \(n\)-year discount factor) and vx() (discount factor for \(x - x_0\) years, equivalent to vn(x - x0)). Term lengths can be expressed in years, months, weeks, or days.

See also

Interest Rates — Full guide to interest rate curves and scenarios.