Quick answer

An employer may change a commission rate only when the change is consistent with the employment contract, collective bargaining agreement (CBA), valid commission plan, and established company practice—and does not reduce commissions already earned.

A unilateral reduction is legally vulnerable when the commission rate or formula is:

expressly promised in an employment contract, CBA, appointment letter, or commission plan;
already part of the employee’s wages or a consistently and deliberately granted benefit;
changed retroactively after the employee has completed the work or sale required to earn the commission;
implemented to evade minimum-wage requirements, withhold wages, discriminate, retaliate, or pressure the employee to resign; or
imposed without a contractual basis where the employer claims an unrestricted power to change compensation.

A prospective adjustment may be lawful in some circumstances, particularly when a valid plan clearly permits changes, the commission is genuinely variable, the change applies only to future transactions, and employees retain a real opportunity to earn commissions. The answer ultimately depends on the documents, the employer’s past practice, when each commission became earned, and the actual effect of the change.

Commissions are wages when paid for an employee’s work

Article 97 of the Labor Code defines “wage” broadly. It covers remuneration for work or services whether calculated on a time, task, piece, commission, or other basis. A commission earned by an employee is therefore not merely a gratuity that the employer may disregard.

The Supreme Court has also explained that no general law requires every employer to establish a commission system or prescribes one universal formula. The amount and method ordinarily come from the CBA, individual employment contract, or established employer practice. Once the employer creates the system, however, its lawful terms matter.

This distinction is important:

An employer is not generally required to introduce commissions where none were promised.
Once commissions are contractually due or have been earned under the applicable plan, the employer cannot simply refuse to pay them.
A variable commission is not necessarily a guaranteed fixed monthly amount.
Calling a payment a “bonus,” “incentive,” or “allowance” does not settle its legal character. What matters is why it is paid, how it is calculated, and whether the employee has already satisfied the conditions.

In Lagatic v. NLRC, the Supreme Court upheld the commission formula that had been presented to and accepted by the employee. The Court stressed that the sales personnel’s commissions were not fixed or assured, while their privilege to earn commissions remained. That ruling does not give every employer unlimited authority to reduce an agreed rate; it shows why the precise formula and circumstances are decisive.

When a commission-rate reduction is likely unlawful

The existing rate is part of a binding agreement

An employer should first examine the employment contract, CBA, commission agreement, sales plan, handbook, memoranda, and incorporated policies. Under Article 1159 of the Civil Code, contractual obligations have the force of law between the parties and must be performed in good faith.

A definite promise such as “5% of net collected sales” is materially different from a plan that states rates may be reviewed for future sales under defined conditions. Even a reservation clause is not automatically conclusive: its wording, scope, manner of exercise, and consistency with labor law must still be assessed.

An employer ordinarily cannot convert a mutually binding compensation term into one that depends entirely on its uncontrolled will.

The change affects commissions already earned

A particularly serious problem arises when the employer applies a lower rate to transactions completed before the change took effect.

The plan should be reviewed to determine the event that makes a commission earned—for example:

signing or booking of the sale;
customer acceptance;
delivery;
invoicing;
receipt of payment;
expiration of a cancellation period; or
completion of specified account-management duties.

Once the employee has fulfilled all valid conditions, the commission is generally due under the governing agreement. A later policy should not be used to rewrite the rate for completed work.

Conditions such as customer payment, cancellations, returns, chargebacks, or account reassignment must be found in the applicable agreement or established policy. They should not be invented after the sale.

The rate or formula has become an established benefit

Article 100 of the Labor Code protects employees against prohibited diminution of benefits. The Supreme Court has stated that diminution is established when:

the benefit is based on a policy or has ripened into a practice over a long period;
the practice is consistent and deliberate;
it did not result from an error in interpreting or applying a doubtful or difficult question of law; and
the employer reduces or discontinues it unilaterally.

There is no automatic number of months or years that makes a practice legally binding. Regularity, deliberateness, duration, the employer’s knowledge, and the evidence all matter. The employee generally bears the burden of proving the alleged practice by substantial evidence. See Nippon Paint Philippines, Inc. v. Nippon Paint Philippines Employees Association.

Commission practices can receive this protection. In Netlink Computer, Inc. v. Delmo, the Supreme Court held that a practice concerning payment of commissions in US dollars had ripened into company practice; using a different conversion approach would unjustly diminish commissions due to the employee.

The new arrangement results in unlawful underpayment

Employees paid by result must still receive at least the applicable prescribed wage for the relevant work period, subject to the Labor Code’s coverage rules and lawful exemptions. An employer cannot use a lower commission rate to defeat a regional minimum-wage order or other mandatory labor standard.

Minimum-wage rates vary by region, location, industry, establishment size, and wage-order classification. The current wage order for the employee’s actual workplace and category must therefore be checked rather than relying on a nationwide figure.

The reduction is retaliatory or discriminatory

Article 118 of the Labor Code prohibits reducing wages or benefits, discharging, or discriminating against an employee because the employee filed or participated in a wage complaint or proceeding.

A reduction may also violate other laws or CBA protections if selectively imposed because of union activity or a protected characteristic. Employers should be able to document a legitimate, consistently applied basis for any distinction among employees.

When a prospective change may be permissible

Not every lower commission payment proves an illegal rate reduction. A prospective change has a stronger legal basis when all of the following are present:

The existing contract, CBA, or commission plan permits the relevant adjustment.
The employer follows any required notice, consultation, negotiation, or approval process.
The new rate applies only to sales or work that will be undertaken after a clear effective date.
Previously earned or vested commissions remain payable under the old plan.
The change is genuine, reasonable, and implemented in good faith.
The plan continues to comply with minimum-wage and other mandatory standards.
The employer does not remove a contractually guaranteed benefit or a protected company practice.
The change is not discriminatory, retaliatory, or designed to force employees out.

Businesses generally retain management prerogative to design reasonable compensation and incentive systems. That authority is not absolute. It must be exercised fairly and within the law, contracts, CBAs, and established employee rights.

Changes in territories, product prices, quotas, collection rules, customer assignments, crediting rules, or eligibility periods may reduce actual commission income even if the stated percentage remains unchanged. Their legal effect should be assessed using the whole compensation system—not the headline percentage alone.

Consent and signed acknowledgments

An employee’s genuine agreement to a prospective compensation change may be relevant, especially when supported by clear terms and lawful consideration. But a signature does not automatically validate every reduction.

Check whether:

the employee received the complete new plan before signing;
the effective date and affected transactions were clear;
the employer disclosed changes to rates, quotas, territories, exclusions, and chargebacks;
consent was voluntary rather than obtained through intimidation or misrepresentation;
the document attempts to waive commissions already earned or mandatory labor rights; and
the employee was given a copy.

Continuing to work after receiving a memorandum should not automatically be treated as informed acceptance of every disputed term. Conversely, an employee’s objection does not by itself establish that a prospective change is unlawful. The documents and surrounding facts remain controlling.

Could a major reduction amount to constructive dismissal?

Possibly, but not every decrease in commission income is constructive dismissal.

The Supreme Court describes constructive dismissal as a situation in which continued employment becomes impossible, unreasonable, or unlikely; there is a demotion or diminution in pay; or the employer’s discrimination, insensibility, or disdain becomes unbearable. The employer’s act must be assessed against any valid exercise of management prerogative. See Dee Jay’s Inn and Café v. Rañeses.

A substantial, unjustified reduction in expected compensation can support such a claim, particularly if it appears intended to force a resignation. But the outcome will depend on matters such as:

whether the commission was guaranteed or variable;
the size and duration of the reduction;
whether lower earnings resulted from the rate change or ordinary sales fluctuations;
whether the employee’s accounts, territory, or opportunities were also removed;
the employer’s business justification and supporting evidence; and
what a reasonable employee in the same position would have done.

Resigning is a high-risk step. An employee considering resignation because of a major pay reduction should obtain individualized legal advice first and clearly document the objection and surrounding events.

What employees should do

1. Identify the governing commission terms

Collect every version of the following:

employment contract and appointment letter;
CBA, if applicable;
commission or incentive plans;
handbooks and written policies;
job offer, email promises, and onboarding materials;
memoranda announcing rate, quota, territory, or formula changes; and
documents showing whether management reserved a power to revise the plan.

Compare the exact language, effective dates, conditions, and approval history.

2. Determine when each commission was earned

Create a transaction-by-transaction record showing:

Item	Information to record
Sale or account	Customer, product, transaction number
Relevant dates	Lead assignment, booking, contract, delivery, invoice, collection
Old terms	Rate, quota, exclusions, applicable plan version
New terms	Rate, formula, effective date
Amount paid	Payroll date and payslip entry
Claimed shortage	Calculation and supporting documents

Separate already-earned commissions from future opportunities. This often determines which plan should apply.

3. Ask for a written explanation and computation

Send a calm written request to HR, payroll, or management asking for:

the legal or contractual basis for the change;
the complete new commission plan;
its approval and effective dates;
whether it applies to pending or completed transactions;
the detailed calculation for each affected commission; and
correction and payment of any shortfall.

State that you are seeking clarification or disputing the computation. Avoid signing an inaccurate acknowledgment, waiver, quitclaim, or “full settlement” without understanding its effect.

4. Preserve evidence lawfully

Keep personal copies of documents you are entitled to possess, including:

payslips and payroll records;
commission statements and sales reports;
emails, messages, and memoranda;
customer contracts, invoices, and collection confirmations, where lawful;
performance evaluations and account-assignment records;
prior years’ commission computations;
written objections and management’s responses; and
names of coworkers with first-hand knowledge.

Do not take trade secrets, private customer information, or files you are not authorized to copy. Preserve original electronic files and metadata where possible rather than relying only on cropped screenshots.

5. Use the grievance procedure if one applies

Unionized employees should promptly consult their union and review the CBA’s grievance deadlines. Disputes involving the interpretation or implementation of a CBA or company personnel policy may be subject to the grievance machinery and voluntary arbitration. Missing an internal contractual deadline can complicate the claim.

6. Seek conciliation through SEnA

A worker or group of workers may file a Request for Assistance under the Single Entry Approach. The official DOLE Assistance for Request Management System accepts online requests and explains onsite filing options at DOLE regional or provincial offices and other implementing agencies.

Under Republic Act No. 10396, labor and employment disputes are generally subject to mandatory conciliation-mediation before referral to the office with jurisdiction, subject to statutory or DOLE exceptions. Either party may request pre-termination and endorsement of unresolved issues.

If settlement fails, the proper next forum may depend on whether the dispute is an individual money claim, an illegal- or constructive-dismissal claim, a CBA grievance, an inspection matter, or an overseas-employment dispute.

Deadlines matter

Article 306 of the Labor Code generally requires money claims arising from employer-employee relations to be filed within three years from accrual. For recurring underpayments, amounts withheld more than three years before the complaint may already be barred even if more recent shortages remain recoverable. The precise accrual date depends on when the commission became due and the employer failed or refused to pay it.

Different periods or procedural deadlines can apply to claims for illegal dismissal, damages, CBA grievances, and appeals. Starting SEnA or an internal grievance should not be assumed to protect every deadline without checking the rule applicable to the particular claim.

Employees should act promptly instead of waiting until resignation or termination.

Common mistakes to avoid

Assuming every commission reduction is automatically illegal.
Assuming the employer may change any rate simply because commissions are variable.
Looking only at the percentage while ignoring quotas, territories, exclusions, collection requirements, and chargebacks.
Failing to distinguish future sales from commissions already earned.
Relying solely on verbal recollection when written plans and payroll records exist.
Signing a new plan, waiver, or quitclaim without keeping and reviewing a copy.
Resigning immediately and alleging constructive dismissal without documenting the reduction and obtaining advice.
Secretly taking confidential company or customer data.
Waiting until older claims fall outside the three-year period.
Treating a coworker’s arrangement as proof that the same terms automatically apply to everyone.

When legal help is urgent

Consult a labor lawyer, union representative, or appropriate DOLE office promptly if:

the employer has withheld commissions already earned;
the new rate is being applied retroactively;
the reduction is large enough to threaten continued employment;
management demands an immediate waiver or resignation;
retaliation begins after an employee asks about unpaid commissions;
termination, suspension, demotion, or removal of accounts is threatened;
the employer may close, become insolvent, or dispose of assets;
a CBA grievance or filing deadline is approaching; or
the arrangement involves an OFW, seafarer, contractor classification, or another jurisdictional complication.

Frequently asked questions

Can an employer reduce the commission rate without the employee’s signature?

Sometimes a genuinely prospective adjustment may be defensible under a valid plan, but the absence of consent is significant when the existing rate is contractual, guaranteed, or protected by established practice. A unilateral change cannot lawfully erase already-earned commissions or mandatory rights.

Can the new rate apply to pending sales?

That depends on when the governing plan says the commission becomes earned and whether the condition is valid. A sale booked under the old plan is not automatically governed by either rate. Examine the rules on booking, delivery, collection, cancellation, and account ownership.

What if the employment contract says the plan may change at any time?

The clause is relevant but does not necessarily authorize retroactive forfeiture, bad-faith changes, unlawful underpayment, discrimination, retaliation, or an unreasonable exercise of discretion. Its exact wording and how it was implemented must be reviewed.

Is a lower monthly commission always a diminution of benefits?

No. Income may decline because sales, collections, prices, territories, or performance changed under the same valid formula. The question is whether the employer unlawfully changed or withdrew a protected term or failed to pay what the employee actually earned.

Can an employer replace a lower rate with a higher basic salary?

Possibly, if the arrangement is lawful and properly agreed or authorized. A higher salary does not automatically cure the loss of a contractual or protected commission benefit. The complete old and new compensation packages, governing documents, and actual effect must be compared.

Must an employee resign before filing a complaint?

No. A worker may question an underpayment or request SEnA assistance while still employed. Continuing to work does not necessarily waive the claim. Resignation may create additional factual and legal issues and should not be treated as the first remedy.

How far back can unpaid commission differentials be claimed?

The general limitation for employment-related money claims is three years from accrual. The recoverable period depends on when each commission became due and when the complaint was filed.

Official legal sources

This article provides general Philippine legal information, not legal advice or a prediction of any particular case. Commission disputes are document- and fact-sensitive. Official sources and procedures were checked as of September 2, 2026.