JBCC payment certificate explained for first-time contractors

Submitting your first JBCC payment certificate is one of the most stressful moments for a new contractor. Get the maths wrong, miss a deadline, or use the wrong form, and you can wait months for payment — or get rejected entirely. This guide breaks it all down.

What is a JBCC payment certificate?

JBCC (Joint Building Contracts Committee) is the most widely used contract suite in South African private-sector construction. A JBCC payment certificate is the formal document the principal agent issues to authorise the employer (your client) to pay you for work completed during a billing period.

It's not the same as an invoice. It's a certified statement of value — the agent has measured and approved the work before payment is owed.

The 7 components of every JBCC payment certificate

1. Value of work completed — the percentage of each trade or section finished, multiplied by the contract sum for that section
2. Materials on site — unfixed materials delivered but not yet built in (usually 80–90% of invoice value)
3. Variations — agreed extras or omissions, valued at contract rates or fair rates
4. Less retention — typically 10% of work done, capped at 5% of contract sum
5. Less previous payments — what the employer has already paid
6. Less escalation adjustments — only if your contract has a CPAP escalation clause
7. VAT (15%) — added to the net amount payable

The interim payment cycle (how it actually works)

Day 1–25: Work happens

You execute work on site during the month. Photograph progress, keep daily site diary entries, and update your variation register as instructions come in.

Day 25–28: Submit your payment claim

Around the 25th (or your contractually agreed date), you submit a payment claim to the principal agent. This includes:

• Measurement of work done (priced bill or schedule of rates)
• Materials on site list with delivery notes & invoices
• Approved variations
• Photographs & site diary extracts (best practice, not always required)

Day 28–35: Agent assesses and issues certificate

The principal agent has 7 working days under JBCC to assess your claim, measure work on site, and issue a payment certificate. If the agent disagrees with valuations, they certify what they think is fair.

Day 35–42: Employer pays

The employer must pay within 7 working days of certificate issue. If they don't, you can issue a notice of intention to suspend work — and ultimately suspend works until paid.

Common payment certificate mistakes

Mistake 1: Claiming materials on site without delivery proof

Materials on site only count if they're (a) physically on site, (b) properly stored, (c) covered by your insurance, and (d) backed by a paid supplier invoice. No invoice = no claim.

Mistake 2: Mixing in variation work without instruction

If the agent hasn't issued a contract instruction (CI) for a variation, you cannot include it in a payment claim. Always insist on written CIs before doing the work.

Mistake 3: Wrong retention percentages

Retention is typically 10% on work done up to a cap of 5% of contract sum. Some contracts use 5% throughout. Read your contract — getting this wrong means you'll be under-claiming or over-claiming.

Mistake 4: Late submission

Most contracts specify a claim date (e.g., 25th of each month). Submit late, and the agent has the right to defer your claim to the following month — adding 30 days to your wait.

What if the agent reduces your claim?

If the principal agent certifies less than you claimed, you have options:

• Negotiate — request a meeting with site measurement to reconcile
• Re-submit — include the difference in next month's claim with new evidence
• Dispute — issue a JBCC dispute notice if the difference is significant and unjustified
• Adjudication — for unresolved disputes, JBCC provides a fast-track adjudication process

The single best thing a contractor can do is photograph everything daily and keep a meticulous site diary. When valuation disputes arise, photographic evidence with timestamps wins arguments faster than memory.

Final account vs interim payment

The interim payment process repeats monthly until practical completion. After that, you submit your final account — a single comprehensive claim for all remaining money including release of the second half of retention (after the defects liability period ends).

Quick reference: timing summary

• Claim submission: By contractually agreed date (typically 25th)
• Agent assessment: 7 working days
• Employer payment: 7 working days from certificate
• Total cycle: ~30–45 days from work done to cash in bank
• Retention release: 50% at practical completion, 50% at end of DLP