Working with last-minute changes and improvised plans

Key rules

• Substantial changes: Your employer cannot freely change your schedule; a substantial change needs written notice with reasons.
• Irregular hours: Uneven hours must come from your collective agreement or an agreement with employee representatives, and rest limits still apply.
• Written recap: After any verbal change in priorities, send a short written message confirming it.
• Trade-offs: When something new arrives, ask what can be dropped.

What "sobre la marcha" means at work

Working "sobre la marcha" means deciding and adapting as things unfold, instead of following a detailed plan made in advance. Priorities, briefings and deadlines can shift at short notice, and people are expected to be flexible and resourceful. How far this goes depends on your sector and your manager.

What your employer can and cannot change

Your employer cannot freely change your working hours. Two situations matter.

A substantial change to your schedule. Your employer must give you written notice, with reasons, before it takes effect. If you do not accept it, you can challenge it in court. In some cases you can end the contract and receive compensation. The timeline below has the notice period and the compensation figure.

Irregular distribution of hours. Your hours can be spread unevenly across the year, but only through your collective agreement or an agreement with employee representatives. Your employer must tell you the day and hour of work in advance. Daily and weekly rest limits still apply.

Part-time workers have separate rules. You also have the right to ask for an adapted schedule. Your collective agreement may set longer notice than the default, so read it first.

Tactics to stay effective

• Leave slack. Do not fill every hour, so a new priority does not break your week.
• Keep a running task list. Reorder it quickly when things change.
• Ask what can be dropped. When something new arrives, ask which existing task gives way.
• Confirm in writing. After a quick chat or call, send a short message recapping priorities, deadline and expected output.
• Stay calm and cooperative. Flexibility is valued, and a friendly tone goes a long way.

When the briefing is vague

Present your questions as wanting to get the work right, not as criticism of the late notice. Ask for the key points: the deadline, the format and who approves the result. Useful phrases:

• "Para asegurarme de que lo hago como quieres, ¿me confirmas la fecha de entrega?"
• "Si te parece, te resumo lo que entiendo."

Follow a short face-to-face or phone check with a brief written recap. Match your tone to your manager's style. The checklist and FAQ below go through these steps again.

Timeline and deadlines

• Your employer gives written notice of a substantial schedule change, with reasons: at least 15 days before it takes effect

• Your employer tells you the day and hour of work under an irregular distribution of hours: at least five days before, unless your agreement says otherwise

• If you end the contract over a substantial change, you receive compensation of 20 days' salary per year worked: capped at nine months of salary

Checklist

• Keep slack in your schedule so a new priority does not break your week.

• Confirm new priorities in a brief written message after a quick chat.

• Ask for the deadline, format and who approves the work when a briefing is vague.

• Keep a running list of tasks so you can reorder it quickly.

• Ask what can be dropped when something new arrives.

• Ask for written notice at least 15 days ahead if your schedule is changed substantially.

• Check your collective agreement for the notice period on irregular hours, which is five days unless it says otherwise.

Frequently asked questions

How much notice must my employer give before changing my working hours?

For a substantial change to your schedule, your employer must give you written notice at least 15 days before it takes effect, with the reasons. If your hours are irregularly distributed, the minimum is five days' notice of the day and hour of work, unless your agreement says otherwise.

Can I leave my job if my employer makes a substantial change to my schedule?

Yes, in some cases of a substantial change in conditions you can end the contract and receive 20 days' salary per year worked, capped at nine months. You can also accept the change or challenge it in court.

How do I ask for clarity on a vague briefing without sounding critical?

Frame it as wanting to get the task right, for example "Para asegurarme de que lo hago como quieres, ¿me confirmas...?". Ask for the deadline, the format and who approves it, then send a short written recap.