The theory of karmic action and result (kamma-vipāka) is a central belief within the Buddhist tradition.
විපාක ND'kamma-result', is any kammically (morally) neutral mental phenomenon (e.g. bodily agreeable or painful feeling, sense-consciousness, etc.
Totally wrong is the belief that, according to Buddhism, everything is the result of previous action.
Kamma-produced (kammaja or kamma-samuṭṭhāna) corporeal things are never called kamma-vipāka, as this term may be applied only to mental phenomena.
vi+pac] fruit, fruition, product; always in pregnant meaning of "result, effect, consequence (of one's action)," either as good & meritorious (;kusala or bad & detrimental (;akusala).
303 (kamma˚); v.251; Sn 653 (kamma˚); Ps ii.79 (dukkha˚); Pv i.91; i.107 & passim; Pug 13, 21; Dhs 431, 497, 987; Vbh 16 sq., 73, 319, 326 sq., 334 (sukha˚) Kvu 353 sq., 464 (kamma & vipāka); Nett 99, 161 180 sq.
The Samyutta Nikaya states: According to the seed that’s sown, So is the fruit you reap therefrom, Doer of good will gather good, Doer of evil, evil reaps, Down is the seed and thou shalt taste the fruit thereof.