The fourth movement begins without pause from the transition. The music resounds in C major, an unusual choice by the composer as a symphony that begins in C minor is expected to finish in that key.[24] In Beethoven’s words:

Many assert that every minor piece must end in the minor. Nego! ...Joy follows sorrow, sunshine—rain.[25]

The triumphant and exhilarating finale is written in an unusual variant of sonata form: at the end of the development section, the music halts on a dominant cadence, played fortissimo, and the music continues after a pause with a quiet reprise of the "horn theme" of the scherzo movement. The recapitulation is then introduced by a crescendo coming out of the last bars of the interpolated scherzo section, just as the same music was introduced at the opening of the movement. The interruption of the finale with material from the third "dance" movement was pioneered by Haydn, who had done the same in his Symphony No. 46 in B, from 1772. It is unknown whether Beethoven was familiar with this work or not.[26]

The Fifth Symphony finale includes a very long coda, in which the main themes of the movement are played in temporally compressed form. Towards the end the tempo is increased to presto. The symphony ends with 29 bars of C major chords, played fortissimo. In The Classical Style, Charles Rosen suggests that this ending reflects Beethoven's sense of Classical proportions: the "unbelievably long" pure C major cadence is needed "to ground the extreme tension of [this] immense work."[27]

It has been shown that this long chord sequence was a pattern that Beethoven borrowed from the Italian composer Luigi Cherubini, whom Beethoven “esteemed the most” among his contemporary musicians. Spending much of his life in France, Cherubini employed this pattern consistently to close his overtures, which Beethoven knew well. The ending of his famous symphony repeats almost note by note and pause by pause the conclusion of Cherubini’s overture to his opera Eliza, composed in 1794 and presented in Vienna in 1803.[28]