How Does Seniority Work in a Union? What Your Collective Agreement Actually Does

You have heard the word a thousand times. It still does not mean what the lunchroom thinks. Seniority is the service credit your collective agreement says you have. It can sit under postings, layoff, recall, vacation, shift bids, transfers, and sometimes overtime. It does not come from being the oldest person in the room. It comes from the language.

Two union shops can run completely different systems. Plant-wide. Departmental. By classification. Do not assume the most senior person gets every job, every shift, and every Saturday. Ontario’s collective agreement library is full of books that prove that.

What the book usually decides

• How seniority is accumulated, and when it starts.
• Whether the list is plant-wide, departmental, or by classification.
• What happens if you transfer.
• How postings, promotions, and equal dates are broken.
• How layoff, bumping, and recall work.
• How vacation and shifts are picked.
• When you can lose it.

That is why “who gets the job?” is an article, not a feeling. Management rights fill the silence. If the book does not give seniority the work, management often does.

It is not always first in, first out

A lot of agreements say seniority governs *provided* the senior employee has the qualifications and ability to do the work. That is two questions. Who is senior. And do they meet the bar the article sets. If the clause requires qualifications, years alone do not win the posting. Read the verbs. “Shall be awarded to the senior applicant” is not the same sentence as “seniority shall be a factor.”

Postings, layoff, bumping, recall

On a posting, three people can apply and the senior qualified person can have a contractual right — or the employer can weigh ability, if that is what you bargained. Changing the job and skipping the posting are different fights. Both start with the same article.

Layoff language is often reverse seniority: least senior goes first. Exceptions are everywhere. Qualifications. Classifications. Departments. Seniority units. Temps. Probation. Bumping is the right, where the book gives it, to move into a job held by someone junior when your own job is gone. The clause will say who you can bump, whether you have to be able to do the work, and how long you have to say so. Miss that window and the right can die before the merits do.

Recall is the way back. Order, qualifications, and how long the right lasts are all in the article. “We called and you didn’t answer” is a fight about the notice the book requires, not about whether the company felt like it.

Vacation, shifts, overtime

Vacation is often picked most-senior to least. Sometimes by department. Sometimes the operation can block a week. Last year’s practice is not this year’s right unless the book — or a real past practice — says so.

Shifts are the same split. Some books let you bid a days job by seniority. Others leave the board with management, inside the scheduling rules. Overtime is the messiest. Equalization, rotation, seniority, availability, qualifications. The question is not “am I more senior?” It is “how does this agreement offer the hours?”

You can lose it — only the way the book says

Typical triggers: you quit, you are discharged for just cause and it sticks, you do not come back from a leave, you do not answer a recall, you abandon the job. The employer does not get to wipe a date because you were off. There has to be a clause. If they say you lost it, get the steward on the language the same day.

The date itself matters. A day can be a posting, a vacation week, a layoff. If the list looks wrong, say so. Do not treat the company’s printout as gospel. Ties are whatever the book uses to break them — hire time, employee number, application date. Rumour is not a tie-breaker.

When it becomes a grievance

A junior person gets the job over a senior qualified applicant. Overtime skips the list. The wrong date is used. A layoff ignores the order. Recall is not honoured. Vacation selection is made up. Those can be grievances. Whether they win depends on the words and the facts — and on whether you are still inside the time limit.

• Write what happened, when, and who got what.
• Your date. Their dates.
• The posting, the list, what the supervisor said.
• Bring it to the steward before the clock runs out. File with what you have. Then build.

So: how does seniority work? However your agreement says it works. Not “we’ve always done it that way.” Not “the senior person always gets it.” Not what another local told you on nights. Open the article. Then use it.