Use heretofore when referencing events up to a specific past time, signaling a change from past to present. Heretofore, the company had not considered remote work an option.
Pro Tip 2/3
Archaic Tone
Heretofore often appears in historical or legal texts, giving a formal or outdated impression. The rights heretofore granted are hereby revoked.
Pro Tip 3/3
Literary Emphasis
In literature, heretofore can create drama by highlighting an important change or revelation. Her feelings for him, heretofore hidden, now came to light.