Service agreement and supply contract on a Philippine office desk with pen and highlighter, reviewed for common drafting mistakes

Common Mistakes in Philippine Service and Supply Contracts

ByCivilLaw.PH Editorial Team

Short answer: The most common mistakes in Philippine service agreements and supply contracts are a vague scope or specification, no written acceptance procedure, deadlines that still require a demand before delay begins, late-payment interest that was never put in writing, penalty clauses courts can cut down, one-sided termination rights, and contracts signed by someone without authority. Each one weakens your remedies under the Civil Code.

Service agreements (cleaning, IT support, marketing, construction, maintenance, manpower) and supply contracts (raw materials, inventory, equipment, made-to-order goods) are the everyday paperwork of Philippine business. Most disputes over them are not about exotic legal questions. They come from drafting shortcuts and sloppy contract management that leave one side unable to prove what was promised or to enforce it. This article is a mistake-by-mistake checklist, with the Civil Code rule behind each problem and a practical fix. For what to do once a contract has actually been broken, see our guide to breach of contract in the Philippines.

What are the most common mistakes, at a glance?

MistakeWhy it hurtsCivil Code anchorBetter practice
Vague scope, specs or deliverablesEach side reads the contract its own way; ambiguity is read against whoever drafted itArts. 1349, 1370, 1377, 1715Attach a statement of work or technical specs with measurable standards
Calling a sale a “service agreement” (or vice versa)Different rules on warranties, risk of loss and price applyArts. 1467, 1713, 1714Say whether goods are standard stock or made to order
No written acceptance or inspection processAccepting the work can release the contractor from liability for visible defectsArt. 1719Set an inspection period, written acceptance and a reservation of rights
Deadlines with no “no demand needed” clauseDelay generally starts only after a demandArt. 1169State that delay arises on the due date without need of demand
Unwritten late-payment interestNo stipulated interest can be claimedArt. 1956Put the rate, start date and computation in writing
Oversized or unclear penalty clauseCourts may reduce it; it may replace, not add to, damagesArts. 1226–1229Set a reasonable amount and say if it is on top of damages
“Sole discretion” termination or pricingCompliance cannot be left to one party’s willArts. 1308, 1191Use objective grounds, notice and a cure period
Oral change orders and price adjustmentsDisputes over what was agreed; for fixed-price construction, written authorization is requiredArt. 1724Use a signed change-order form for every scope or price change
Signatory without authorityThe contract is unenforceable unless ratifiedArt. 1317Ask for a board resolution, secretary’s certificate or special power of attorney
Waiving liability for fraudThe waiver is voidArts. 1171, 1716Draft liability caps that carve out fraud and bad faith

Why do vague scope and specifications cause so many disputes?

The object of every contract must be “determinate as to its kind” (Art. 1349). A service agreement that promises “general maintenance” or a supply contract for “good quality materials” technically has an object, but it gives both sides room to argue. When the words are clear, their literal meaning controls (Art. 1370); when they are not, courts look at what the parties did before and after signing (Art. 1371), and “obscure words or stipulations” are interpreted against the party who caused the obscurity (Art. 1377). If you drafted the vague clause, the ambiguity will likely be read against you.

For work contracts, Art. 1715 requires the contractor to deliver work that “has the qualities agreed upon.” That duty is only as strong as the description of those qualities. The fix is simple: attach a statement of work, specifications, service levels (response times, uptime, quantities, tolerances) and the documents that prove completion, and say which document prevails if the attachments conflict.

Is your “service agreement” really a sale, and why does it matter?

Many supply deals are labelled “service agreements” and many fabrication jobs are papered as “purchase orders.” The label does not decide the issue. Under Art. 1467, a contract to deliver an article the seller makes or procures for the general market is a sale, while goods “manufactured specially for the customer and upon his special order” fall under a contract for a piece of work. A piece-of-work contract is defined in Art. 1713, and when the contractor also furnishes the materials, Art. 1714 pulls in the sale rules on warranty against hidden defects and payment of price.

Why it matters: the classification affects who bears the loss if the goods are destroyed before delivery (Arts. 1717–1718 for work contracts), which warranties apply, and how quickly claims must be filed. State plainly what you are buying — standard goods, custom-made goods, labor only, or labor plus materials — and address risk of loss and warranties directly instead of relying on the default rules.

What goes wrong with deadlines, penalties and late-payment charges?

Deadlines. Under Art. 1169, a party obliged to deliver or to do something generally incurs delay only from the time the other side demands performance, judicially or extrajudicially. Demand is not needed when the contract or law expressly says so, when time was a controlling motive for the contract, or when demand would be useless. If your contract does not say that delay arises automatically on the due date, send a written demand before claiming delay damages. Our guide on when a debtor is in delay or default covers this in detail.

Penalty and liquidated-damages clauses. A penalty clause substitutes for damages and interest unless the contract says otherwise (Art. 1226). You cannot demand both performance and the penalty unless that right is clearly granted (Art. 1227). You do not need to prove actual loss to collect it (Art. 1228), but the court “shall equitably reduce” it when the obligation was partly or irregularly performed, and may reduce it if it is “iniquitous or unconscionable” (Art. 1229). A daily penalty with no cap is an easy target. See liquidated damages vs penalty clauses for drafting tips.

Late-payment interest. Art. 1956 says “no interest shall be due unless it has been expressly stipulated in writing.” That article sits in the rules on loans, but the lesson applies to every supply and service invoice: if you want a contractual late-payment rate, write it into the signed contract, not just on the invoice. Without it, you are generally limited to legal interest as damages — currently 6% a year — which the court may impose from judicial or extrajudicial demand once the amount is reasonably certain (Lara’s Gifts & Decors, Inc. v. Midtown Industrial Sales, Inc., G.R. No. 225433, August 28, 2019). Our explainer on legal interest on unpaid debt shows how courts compute it.

How do acceptance and warranty mistakes leave you without a remedy?

For work contracts, Art. 1719 is a trap for busy clients: acceptance of the work “relieves the contractor of liability for any defect,” unless the defect is hidden and the client could not be expected to spot it, or the client expressly reserves its rights. Signing a completion certificate on the day of turnover, without inspection, can cost you your claim for visible defects. Build in an inspection window, a punch list, and language that acceptance is without prejudice to defects discovered later.

For supply contracts, the seller warrants against hidden defects that make the goods unfit or less fit for their intended use (Art. 1561), even if the seller did not know of them (Art. 1566), unless the parties stipulated otherwise and the seller was unaware of the defect. The buyer may withdraw from the contract or ask for a proportionate price reduction, with damages (Art. 1567). But Art. 1571 bars these actions “after six months, from the delivery of the thing sold.” Buyers who wait for a year-end audit to check stock can lose the statutory warranty entirely. Inspect on delivery, notify defects in writing, and negotiate an express warranty period and remedy (repair, replacement, refund) in the contract.

Which clauses are void or easy to attack?

  • “Sole discretion” clauses. The contract “must bind both contracting parties; its validity or compliance cannot be left to the will of one of them” (Art. 1308). Termination or repricing at one party’s whim invites challenge. Use objective grounds, written notice and a cure period — see how cure periods affect termination.
  • Waivers of liability for fraud. Any waiver of an action for future fraud is void (Art. 1171), and a clause limiting a contractor’s liability for defects is void if the contractor acted fraudulently (Art. 1716). Liability caps should carve out fraud and bad faith.
  • Copy-pasted force majeure clauses. Art. 1174 excuses parties from unforeseeable or inevitable events, except when the law, the contract, or the nature of the obligation places the risk on them. A generic clause that lists “acts of God” but says nothing about notice, suspension, or when either side may terminate leaves the real questions open. Read more on fortuitous events and force majeure.
  • Stipulations contrary to law or public policy. Parties may agree on any terms that are not “contrary to law, morals, good customs, public order, or public policy” (Art. 1306). Clauses that try to shift mandatory legal duties — for example, a contractor’s responsibility for its own workers — are risky.

Who signed, and is it in writing?

A contract made in another’s name by someone “who has no authority or legal representation, or who has acted beyond his powers” is unenforceable unless ratified (Art. 1317; Art. 1403(1)). With corporations, ask for a board resolution or secretary’s certificate; with individuals acting for others, a special power of attorney. Keep the authority document with the contract.

Many supply relationships run on text messages and verbal orders. Contracts are generally binding in whatever form they were made (Art. 1356), but under the Statute of Frauds (Art. 1403(2)) certain agreements cannot be enforced by action without a signed writing — including a sale of goods at a price of ₱500 or more (unless the buyer accepted part of the goods or paid part of the price) and an agreement not to be performed within a year. A signed master supply agreement plus written purchase orders avoids the issue. Written contracts also give you a longer window to sue: ten years for actions on a written contract versus six for an oral one (Arts. 1144–1145). See prescription of contract actions.

What mistakes do suppliers and contractors make?

The Civil Code also protects the provider, but only if the paperwork supports the claim:

  • Not documenting client-caused delay. If the work needs an act from the client and the client delays, the contractor is entitled to reasonable compensation (Art. 1721). Log the delay and notify the client in writing.
  • Absorbing cost increases on a fixed-price build. Under Art. 1724, a contractor building for a stipulated price cannot demand a higher price because labor or materials became costlier, unless the owner authorized a change in plans in writing and the additional price was fixed in writing by both parties. The Supreme Court applied this strictly in Leighton Contractors Philippines, Inc. v. CNP Industries, Inc. (G.R. No. 160972, March 9, 2010), denying extra payment where these written requirements were not met.
  • Ignoring subcontractor and worker claims. The contractor answers for the work of the people it employs (Art. 1727) and for their claims (Art. 1728). Labor and materials suppliers may also have an action against the owner up to what the owner still owes the contractor (Art. 1729). Labor laws and DOLE rules on contracting add further duties, so check them for manpower-heavy services.
  • Releasing goods without securing payment. A party who has worked on a movable may retain it until paid (Art. 1731), and a seller of specific goods may reserve ownership until conditions are met (Art. 1503). Use these rights deliberately and write them into your terms.

How should you review a service or supply contract before signing?

  1. Confirm the parties and signatories. Correct legal names, addresses, and proof of authority for whoever signs.
  2. Classify the deal. Standard goods, made-to-order goods, labor only, or labor plus materials.
  3. Nail down scope. Attach specs, service levels, quantities, delivery points and completion documents.
  4. Set time rules. Due dates, whether delay arises without demand, and extensions for client-caused delay.
  5. Price and payment. Price basis, billing triggers, written late-payment interest, and how price changes are approved.
  6. Acceptance and warranty. Inspection period, written acceptance, reservation of rights, warranty period and remedies.
  7. Risk allocation. Penalty or liquidated damages (reasonable and capped), liability caps with fraud carve-outs, force majeure with notice and exit rules.
  8. Exit and disputes. Termination grounds, notice and cure periods, and a dispute clause (negotiation, mediation, arbitration or courts, and venue).

On disputes, the Alternative Dispute Resolution Act of 2004 (RA 9285) declares a state policy to promote party autonomy and the use of mediation and arbitration. A clear escalation clause can keep a supply problem out of court. Our step-by-step guide on handling civil disputes in business deals explains the forums.

What if the mistake is already in a signed contract?

Start by reading the whole contract together, since stipulations are interpreted as a whole (Art. 1374), and gather evidence of how both sides actually performed (Art. 1371). Then choose the route that fits where you are:

  1. No dispute yet — amend it. Propose a signed amendment or addendum that fixes the gap (scope, acceptance, interest rate, change-order process, authority). This is the cheapest fix and needs both parties’ signatures (Art. 1308).
  2. The paper does not match what you actually agreed — ask for reformation. If the written instrument fails to state the parties’ true agreement because of mutual mistake or a drafting error, either party may ask the court to reform it (Arts. 1361 and 1364). This is a court action, so consult counsel.
  3. The other side has not performed — demand, then file in the right forum. Send a written demand with a deadline; it puts the other party in delay (Art. 1169) and interrupts prescription (Art. 1155). If there is no settlement, the forum depends on the parties and amount: barangay conciliation only for individuals living in the same city or municipality; arbitration if the contract has an arbitration clause (construction disputes go to CIAC); small claims for pure money claims up to ₱1,000,000, exclusive of interest and costs, under the Supreme Court’s Rules on Expedited Procedures in the First Level Courts (Rule IV, Sec. 1); otherwise a regular civil action. Our guide on handling civil disputes in business deals walks through each forum.

Deadlines to diary: hidden-defect claims on goods are barred six months from delivery (Art. 1571; applied in Ang v. Soledad, G.R. No. 177874, September 29, 2008); actions on a written contract prescribe in ten years and on an oral contract in six (Arts. 1144–1145).

Documents to gather: the signed contract and all attachments, purchase orders, delivery receipts, acceptance or completion certificates, change orders, invoices and proof of payment, written defect notices, emails and chat messages, and the signatory’s board resolution, secretary’s certificate or SPA.

First action: if goods were delivered defective, send a written defect notice today and calendar the six-month cutoff; otherwise, send a written demand or a proposed amendment. For the broader picture, see our business civil-law risk checklist.

Key takeaways

  • Most service and supply disputes start with vague scope; attach measurable specs and completion documents.
  • Acceptance without inspection can waive claims for visible defects (Art. 1719), and hidden-defect actions on goods expire six months from delivery (Art. 1571).
  • Write down the late-payment rate and say whether delay arises without demand.
  • Keep penalties reasonable; courts can reduce iniquitous or unconscionable ones (Art. 1229).
  • Check signing authority and use written change orders for every scope or price change.

Frequently asked questions

Is a purchase order enough, or do I need a full supply contract?

A signed purchase order can be a binding contract, but it usually leaves out warranties, acceptance, penalties and dispute rules. For recurring supply, a master agreement with purchase orders issued under it is safer.

Can a court reduce the penalty in my service agreement?

Yes. Under Art. 1229, the court must equitably reduce the penalty if the obligation was partly or irregularly performed, and may reduce it if it is iniquitous or unconscionable, even without any performance.

How long do I have to complain about defective goods from a supplier?

Actions under the Civil Code’s hidden-defect warranty rules are barred six months from delivery (Art. 1571). An express contractual warranty may give you different terms, so check the contract and notify defects in writing right away.

Is a contract signed by an employee without authority valid?

It is unenforceable unless the company ratifies it, expressly or impliedly, before the other party revokes it (Art. 1317). Accepting deliveries or paying invoices under it may count as implied ratification.

Sources

This article is general information, not legal advice. For advice on a specific contract, consult a lawyer, or the Public Attorney’s Office (PAO) if you qualify for free legal assistance.

Sources rechecked as of: September 28, 2026