It is very simple
Can. 989 After having reached the age of discretion, each member of the faithful is obliged to confess faithfully his or her grave sins at least once a year.
If one is not conscious of grave sin, there is no requirement at all to confess, simply because a year has passed.
The Easter duty is simply of one of receiving the Eucharist.
Can. 920 §1 Once admitted to the blessed Eucharist, each of the faithful is obliged to receive holy communion at least once a year.
§2 This precept must be fulfilled during paschal time, unless for a good reason it is fulfilled at another time during the year.
As a practical matter, those who only receive the Eucharist once per year – which is itself beyond tragic since the Second Vatican Council rightly decreed that one should receive each time one assists at Mass and from elements consecrated precisely at the Mass at which they assisted – would confess immediately before approaching the Eucharist to clear their conscience of serious sin they had committed since the previous annual Communion.
In fact, however, those who practice the barest minimum would fulfill the law by confessing their serious sins in, for example, Advent of each year and, presuming they had no serious sin, receiving their annual Communion on the first Sunday of Lent.
Please note: This would be legally correct but hardly to be lauded relative to how one should live the sacramental life.