Am I automatically regular after six months of probation?

Why

Article 296 of the Labor Code, formerly Article 281, does the work here. Probationary employment shall not exceed six months from the date the employee started working, unless it is covered by an apprenticeship agreement stipulating a longer period. The employee may be terminated for a just or authorised cause, or when they fail to qualify as a regular employee in accordance with reasonable standards made known by the employer at the time of the engagement. And the closing sentence is the one to remember: an employee who is allowed to work after a probationary period shall be considered a regular employee.

The six months runs from your first day of actual work, not from the date on the contract, and it is generally counted as 180 days. Letting you clock in on day 181 is not an oversight the employer can undo afterwards. Regularisation at that point happens by operation of law and does not need a memo, a ceremony, or a new contract.

The standards requirement is the provision employers most often fail. The reasonable standards for regularisation must be communicated at the time of engagement, meaning at hiring and not at the end of the period. Where they were not, the law treats you as a regular employee from the start, and the employer is then held to the full rules on dismissal. Vague standards fare little better than none, and an employer who says only that performance must be 'satisfactory' will usually have to explain what that meant in practice.

Probationary status is not the absence of security of tenure. A probationary employee enjoys it for the duration of the period and can be let go only for a just or authorised cause, or for genuine failure to meet the standards made known at hiring. Termination on that last ground requires a written notice served within a reasonable time before the termination takes effect, and it has to happen within the probationary period, because once the period lapses you are already regular. A dismissal on the last day with no prior indication of a problem invites a challenge.

There are real exceptions to the six months. An apprenticeship agreement may stipulate longer. The courts have exceptionally allowed a longer period where the nature of the work genuinely needs more time to assess. Some occupations have their own rule, most notably academic personnel in private schools, who are governed by the Manual of Regulations for Private Schools rather than by Article 296. And the parties may agree to extend the probation where the extension is for the employee's benefit, as a second chance rather than a device, which the courts have allowed on those terms.

Two things do not extend probation: renaming it a 'training period' or an 'evaluation period', and moving you to a fresh contract for the same work. Where the duties are necessary or desirable to the employer's usual business, Article 295 governs regardless of the label on the paper.