In computing the annual value of a let-out house, what term describes the maximum rent that the applicable rent-control law allows the landlord to charge?

Standard rent is the ceiling a rent-control law places on the rent a landlord may lawfully recover; in Sheila Kaushish v. CIT (1981) the Supreme Court held that annual value cannot exceed it. Actual rent is what the tenant pays or owes, and municipal value is the valuation adopted by the local authority for property tax. Notional rent is the amount the property might reasonably be expected to fetch, which is capped by the standard rent where rent control applies.