Actas parciales in Colombia: what evidence they require and why they get returned
An acta parcial de obra is the document through which the progress executed in a given period of a works contract is recognised and settled for payment. It gathers the executed quantities, valued at the agreed prices, with the applicable deductions and advance amortisations, and requires the signature of the interventoría or supervision. It is the document that turns work into cash flow — and where most of a contract's administrative friction concentrates.
What it contains
The usual components, which vary by entity and contract:
Identification. Contract, acta number, period covered, contractor, interventoría.
Executed quantities. Item by item, with the quantity for the period, the accumulated, the contracted and the balance.
Value. Quantities times the agreed unit price, subtotal for the period and accumulated.
Advance amortisation. Per the contract’s mechanism, normally proportional to progress.
Deductions and retentions. Warranty retention, tax withholdings, applicable contributions.
Net amount payable.
Signatures. Contractor and interventoría or supervision, plus whichever the entity requires.
The evidence the interventoría will ask for
Here lies the difference between an acta that passes and one that comes back.
| Evidence | What it proves |
|---|---|
| Quantity take-off memories | How each quantity was measured, and where |
| Marked-up drawings or sketches | Verifiable location of what was measured |
| Dated photographic record | Condition of the executed work |
| Tests and quality certificates | Technical compliance where applicable |
| Partial acceptance records per item | The interventoría’s prior conformity |
| Social security and payroll evidence | Compliance with personnel obligations |
| Site logbook | Context of what happened in the period |
Social security tends to be the one that stalls actas for non-technical reasons: the work is well executed and the acta is returned because an administrative document is missing. It pays to have that package assembled before filing, not after.
Why they get returned
Quantities without calculation memory. The number is there, but there is no way to verify it. Observation number one.
Items not under contract. Real, executed work that is not in the bill of quantities. It is not a problem of the acta: it is additional work and has its own procedure.
Larger quantities without prior authorisation. Executing more of a contracted item than foreseen, without the corresponding procedure, leaves that difference in the air.
Running totals that do not add up. The acta’s accumulated does not match the sum of previous actas. It happens through carry-over errors and erodes trust in the whole package.
Missing prior acceptance. An item is billed that the interventoría has not accepted as conforming. The right sequence is acceptance first, acta after.
Incomplete personnel evidence. Payrolls, contributions, affiliations.
Filing out of time. The period closes and the acta rolls to the next one.
The additional-work problem
It deserves its own section, because it is where the most money is lost in Colombia.
When unforeseen work appears there are two paths. The correct one is to process the new item with its price, obtain approval, then execute and bill it. The one frequently taken is to execute first — because the site cannot stop — and try to fit it later into a similar item.
That second path fails in two ways: if the interventoría detects it, it returns the acta and a shadow falls over the rest; if it does not, you billed at a price that does not correspond, and that can surface in a later audit.
When the work cannot wait for the procedure, the protective sequence is: leave written record of the finding before intervening, with photos; request a written instruction; execute while recording that it is done under reservation of processing the price; and document exhaustively. It does not guarantee payment. It greatly improves your position.
How to reduce returns
Agree the format on the first acta. Ask the interventoría for an example of an approved acta from another contract of the same entity.
Frequent partial acceptances. Weekly, recorded. At period close, the acta adds up conforming acceptances instead of opening a negotiation.
A live running total per item and location. It removes mismatches and duplications at the root.
Assemble the administrative package in parallel, not at the end. Social security, payrolls and certificates do not depend on progress and can be ready beforehand.
File with margin. Never on the last day. Three days of slack allow a minor observation to be fixed within the same period.
Frequently asked questions
- How often are actas parciales submitted?
- The contract defines it. Monthly is the most common. Shorter periods improve cash flow at the cost of more administrative load.
- Can I bill materials on site that are not yet installed?
- Only if the contract expressly allows it, under the conditions it sets: proof of ownership, custody, sometimes an additional guarantee.
- What is the difference between an acta parcial and a partial acceptance record?
- The partial acceptance record certifies that the interventoría accepted a piece of work as conforming. The acta parcial is the billing document for the period. Partial acceptances feed the acta parcial.
- What happens to quantities executed but not billed at closeout?
- They are lost if not claimed before settlement. It is more common than it seems: projects end up leaving quantities unbilled because nobody kept the running total against the contract. Settlement is the last moment to catch it.
- Can the interventoría modify my quantities?
- It can observe them and decline to accept them. Any modification is resolved between the parties, and what was not documented at the time cannot be sustained later.
Founder and CEO of Paladio. He has spent more than 15 years building financial products that touch the lives of millions of people. He writes about what he sees on site: how progress is really measured and where the money leaks.
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