In investment, an annuity is a series of payments made at equal intervals. Examples of annuities are regular deposits to a savings account, monthly home mortgage payments, monthly insurance payments and pension payments. Annuities can be classified by the frequency of payment dates. The payments (deposits) may be made weekly, monthly, quarterly, yearly, or at any other regular interval of time. Annuities may be calculated by mathematical functions known as "annuity functions".

वित्त सिद्धांत में वार्षिक भृति या वार्षिकी (annuity) का मतलब ऐसे भुगतान से है जो एकसमान मात्रा में निश्चित अन्तराल पर एक निश्चित अवधि तक किया जाता है।