How to analyze a bid below 75% in public works and engineering services: Law 14,133, TCU case law, due diligence, evidence, unit prices and additional guarantee.
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In procurements for public works and engineering services, art. 59, §4 of Law 14,133/2021 states that bids below 75% of the amount budgeted by the Administration shall be considered unfeasible. The practical interpretation, however, does not end with that sentence. The Law itself provides for due diligence to assess feasibility, and TCU case law has recognized, in relevant decisions, that the 75% threshold may operate as a rebuttable presumption, allowing the bidder to demonstrate that it can perform the scope for the price offered. This requires the Administration to carry out a structured technical analysis, especially when the bid presents an aggressive discount against an engineering budget.
The correct conclusion is neither “below 75% is always accepted” nor “below 75% is always disqualified without analysis.” The manager must consider the statutory text, the procurement notice, the case law applicable to the case and, when demonstration is permitted, technically test the bid. This verification should consider total price, quantities, relevant unit prices, labor, Social Charges, BDI, productivity, equipment, materials, site administration, mobilization, risks and schedule. The purpose is not to protect the Administration’s budget from discounts; it is to avoid contracting a price that cannot sustain actual execution.
What Law 14,133 says about unfeasible prices
Art. 11 of Law 14,133 includes among the objectives of procurement avoiding contracts with manifestly unfeasible prices. Art. 59 details bid evaluation and requires disqualification of bids that present unfeasible prices or whose feasibility is not demonstrated when required by the Administration.
For public works and engineering services, the Law establishes three commands that must be read together:
- §2 allows due diligence to assess feasibility or require the bidder to demonstrate it;
- §3 requires consideration of total price, quantities and relevant unit prices, according to the acceptability criteria defined in the notice;
- §4 establishes the threshold of 75% of the Administration’s budget.
This structure shows that feasibility is a matter of technical evaluation, not merely a percentage calculation.
How to calculate the 75% threshold
If the Administration’s estimated budget is R$ 10,000,000.00:
- 85% = R$ 8,500,000.00;
- 75% = R$ 7,500,000.00;
- a bid of R$ 7,500,000.00 is exactly 75%;
- a bid of R$ 7,499,999.99 is below 75%.
The wording of §4 uses “below 75%.” Therefore, exactly 75% is not below the statutory threshold. This does not mean that a bid at 75% is automatically feasible: it remains subject to the general review of compliance, relevant unit prices, quantities and the other criteria in the notice.
Is the 75% threshold absolute or rebuttable?
This is the most sensitive point in the subject. TCU decisions have adopted different interpretations.
In earlier decisions, such as Decision 2198/2023, the interpretation appeared that a bid below 75% should be disqualified without due diligence. In 2024, however, the TCU Plenary issued important decisions in the opposite direction. Decision 465/2024 stated that the criterion in §4 leads to a rebuttable presumption of unfeasibility and that the Administration must give the bidder an opportunity to demonstrate viability. Decision 803/2024 also recognized the possibility for the bidder to demonstrate the feasibility of the proposal.
The debate has not disappeared. Decision 2494/2024 expressly recorded the existence of both theories, and a dissenting vote in Decision 214/2025 defended an absolute presumption. Nevertheless, cases decided by the TCU in 2025 again addressed the possibility of relativization and the need to verify the demonstration presented in the specific case.
For governance purposes, this means that the Administration should not act as if the issue were trivial. The record must identify which interpretation was adopted, the case law considered and the technical evidence supporting the decision.
Why comparing only the total price is insufficient
Two bids of R$ 7 million may have completely different risks. One may have reduced margin, negotiated materials and used proven productivity. The other may have omitted staff, underestimated site administration, zeroed mandatory components and shifted costs to future items.
Art. 59, §3 is intended precisely to prevent an exclusively total-price analysis. It requires consideration of quantities and relevant unit prices.
The ABC Curve of the budget is a useful tool for prioritizing the analysis. Services that represent a large share of value or concentrate technical risk deserve deeper due diligence.
| Level of analysis | Central question |
| total | can the total price sustain the full scope? |
| relevant unit prices | are critical items compatible with real execution? |
| quantities | does the bid preserve contractual quantities? |
| productivity | are the coefficients technically justifiable? |
| labor | are wages, social charges and benefits covered? |
| indirect costs | were site administration, mobilization and support structure considered? |
| risk | do contingencies and contractual obligations fit within the price? |
The Administration’s budget must be reliable before testing the bid
A feasibility review is defensible only if the baseline budget is also reliable. Independent review checks quantities, cost compositions, ABC Curve, productivity, BDI and Social Charges before concluding whether the discount is real or merely apparent.
The 75% percentage only has meaning if the reference budget is technically consistent. An overestimated budget may create a false appearance of unfeasibility: several bidders may submit prices close to one another and far below the reference because the problem lies in the baseline estimate.
Recent TCU cases have considered the existence of several bids in the same range below the budget as an indication that the discrepancy may result from the Administration’s estimate or from the competitive dynamics themselves.
Therefore, the analysis should begin with an uncomfortable question: is the reference budget correct?
The following should be reviewed:
- design and quantities;
- base date;
- SINAPI, SICRO or other sources used;
- custom cost compositions;
- quotations;
- BDI;
- Social Charges;
- productivity;
- site administration;
- mobilization/demobilization;
- schedule assumptions;
- relevant risks.
If the baseline is wrong, disqualifying bidders based only on the percentage relationship perpetuates the error.
How to structure a feasibility due diligence
The due diligence must answer whether the bid technically and economically covers the contract obligations. It should not become an opportunity for the bidder to create a new proposal or materially alter the original offer.
An efficient sequence is to work from the most material issues down to the details.
1. Confirm the total value and discount
Record the official budget, bid value and corresponding percentage. Use the same comparison basis provided in the notice.
2. Identify the highest-impact items
The ABC Curve and technical criticality help select the services that deserve detailed evidence. It is inefficient to request hundreds of irrelevant proofs while leaving unanalyzed the ten items that determine the economic outcome.
3. Verify material and equipment costs
The bidder may submit quotations, supply contracts, commercial conditions, owned inventory, scale agreements or other evidence. The document must be compatible with the specification, quantity, schedule and delivery location.
A generic quotation for a different product does not demonstrate feasibility.
4. Verify labor
The analysis should compare wages, benefits, SINAPI Social Charges, productivity and required staffing. Labor rights cannot be eliminated to make the numbers close.
5. Verify productivity
It is legitimate for a company to have productivity above the reference. But this must be demonstrable through construction method, equipment, track record, industrialization, prefabrication, logistics or another concrete technical advantage.
Very high productivity without explanation is only an optimistic assumption.
6. Verify site administration and schedule
Low prices often hide insufficient site administration. The structure of engineers, supervisors, technicians, safety, quality, warehouse and support must be consistent with the schedule and complexity.
7. Verify BDI and taxes
A lower BDI is not automatically irregular. The company may have lean central overhead or a reduced commercial margin. Taxes and obligations, however, must be consistent with the actual tax regime.
8. Verify contractual risks
The price must absorb risks allocated to the contractor. If the notice requires insurance, guarantees, testing, commissioning, documentation, assisted operation, specific licenses or interfaces, these costs cannot disappear from the proposal.
Which documents can demonstrate feasibility?
There is no single universal set. The request should be proportionate to the scope and directed to the points of doubt.
Useful documents may include:
- unit-price compositions;
- productivity calculations;
- supplier quotations;
- commitment letters;
- invoices or recent comparable contracts;
- labor spreadsheet;
- collective bargaining agreements;
- Social Charges calculation;
- detailed BDI;
- mobilization plan;
- labor/equipment histogram;
- physical-financial schedule;
- execution methodology;
- evidence of owned equipment;
- scale purchasing agreements;
- similar contracts executed at comparable prices.
The Administration should assess the quality and relevance of the evidence, not the number of attachments.
What should not be accepted as sufficient “proof”
A generic declaration that “the company has full capacity” is weak when there are material doubts. Likewise, stating that the discount results from “experience” without demonstrating productivity, costs or concrete advantages does not complete the analysis.
Another problem is using later documents to artificially rebuild a composition that did not exist in the proposal. Due diligence may clarify and prove; it should not allow material innovation that undermines equal treatment.
Relevant unit prices and spreadsheet gaming
A bid may be low overall and contain some items above the budget, combined with others that are extremely reduced. Depending on the execution regime and the criteria in the notice, this structure may increase the risk of contract amendments, quantity changes and distorted measurements.
The Administration should verify the unit and total price acceptability criteria defined before the competition. It is not appropriate to create a new criterion after knowing the winner.
The summary and detailed budget must allow this traceability.
Feasibility under lump-sum contracting
Under lump-sum contracting, the contractor assumes greater responsibility for performing the scope for the contracted price within the conditions of the design and risk allocation matrix. This does not eliminate control of relevant unit prices during procurement.
Law 14,133 provides that, after evaluation, the winner must resubmit spreadsheets adjusted to the final value with quantities, unit costs, BDI and Social Charges. This step must preserve consistency and avoid opportunistic redistribution of the discount.
The relationship among execution regime, measurement and risks is detailed in the content on lump-sum contracting vs. unit-price contracting.
Bid between 75% and 85%: not unfeasible under §4, but subject to an additional guarantee
There is a range that frequently causes confusion. A bid at 80% of the budget is not below the 75% threshold in §4. Therefore, it is not considered unfeasible under that objective criterion. However, because it is below 85%, §5 requires an additional guarantee from the winner.
Example with a R$ 10 million budget:
- bid of R$ 8 million = 80%;
- it is not below 75%;
- additional guarantee = R$ 10 million – R$ 8 million = R$ 2 million;
- this guarantee is additional to the other guarantees that may be required.
The mechanism shows that the Law treats aggressive discounts in two layers: feasibility and contractual protection.
Bid below 75% and additional guarantee
If a bid below 75% is admitted after demonstrating feasibility under the applicable case-law approach, §5 still applies because the price is also below 85%.
Example:
- budget: R$ 10 million;
- bid: R$ 7 million (70%);
- difference: R$ 3 million;
- if the bid is accepted in the specific case, the additional guarantee will be R$ 3 million, without prejudice to other guarantees.
This requirement may have a significant financial effect and should be considered by the bidder when forming the proposal.
How to justify accepting the bid
Accepting a price far below the reference requires justification proportionate to the risk. The decision should show which doubts were raised, which evidence was requested, how it was analyzed and why the team concluded that the price is sufficient.
A good technical memorandum should record:
- reference budget and base date;
- bid value and percentage;
- critical items analyzed;
- due diligence performed;
- documents received;
- materials/equipment analysis;
- labor analysis;
- productivity;
- site administration;
- BDI/taxes;
- schedule;
- risks;
- applicable additional guarantee;
- objective conclusion.
The justification does not need to state that no risk exists. It must demonstrate that the risk was technically assessed and that the decision is reasonable in light of the evidence.
How to justify disqualification
Disqualification also requires justification. Expressions such as “price too low” or “incompatible with the market,” without analysis, are insufficient for a complex contract.
When due diligence is appropriate, the decision should explain why the evidence failed to demonstrate coverage of the costs. Examples:
- quoted supplier does not meet the specification;
- required productivity is incompatible with the method presented;
- wages do not cover the statutory or collective minimum;
- essential equipment was omitted;
- site administration cannot support the schedule;
- BDI excludes a mandatory tax;
- relevant costs were shifted to unrelated items;
- schedule is incompatible with the proposed resources.
This justification reduces appeal risk and increases the defensibility of the process before oversight bodies.
Frequent Administration errors when analyzing a bid below 75%
Poorly defined acceptability criteria create conflict precisely when an aggressive bid appears. Prior review of the notice structures the evaluation parameters and the evidence that can be requested without improvisation after the competition.
Automatically disqualifying without mapping the applicable case law
The statutory text appears direct, but the TCU has decisions recognizing a rebuttable presumption. Ignoring the issue may lead to challenge.
Conducting generic due diligence
Merely asking “prove feasibility” transfers to the bidder the definition of what must be demonstrated. It is better to identify the costs and assumptions that raised doubt.
Requiring the bid to replicate the official budget
The bid does not need to have the same internal economic structure as the Administration’s estimate. The bidder may have different commercial conditions and productivity.
Accepting a declaration without checking the costs
Due diligence must produce evidence, not merely a formal statement.
Looking only at the total price
Relevant items, labor and schedule may reveal hidden unfeasibility.
Ignoring the additional guarantee
An accepted bid below 85% triggers the specific obligation in §5.
Frequent bidder errors
The bidder also needs to prepare the economic defense of the proposal before the bidding session.
Typical errors include:
- applying a linear discount without recalculating cost compositions;
- zeroing BDI or site administration without justification;
- presenting impossible productivity;
- forgetting freight, mobilization or logistics;
- using incorrect Social Charges;
- failing to reserve the cost of the additional guarantee;
- depending on a substitute material that is not permitted;
- quoting equipment without commercial validity compatible with execution;
- presenting a schedule incompatible with the crew.
An aggressive bid needs more documentation, not less.
In addition to proving feasibility, the Administration should verify whether the discount results from real efficiency or whether the bid economically depends on later contract changes. The article on price diving in public-works procurement discusses in greater depth the signs of spreadsheet gaming, selective concentration of discounts and attempts to recover margin through amendments and claims.
The role of consulting engineering in feasibility analysis
In high-value procurements, the procurement committee may need specialized technical support to analyze spreadsheets, productivity, equipment, construction method and schedule. This support does not replace the Administration’s decision; it provides a technical basis for the evaluation.
Technical Review of the Notice and Attachments acts before publication, defining acceptability criteria and evidence. During the competition, Technical Support for Clarifications, Challenges and Appeals can support the technical analysis of questions and documentation.
Technical checklist for a bid with an aggressive discount
Before the decision, verify:
- exact percentage against the budget;
- consistency of the baseline budget;
- case law and notice rule;
- Class A items on the ABC Curve;
- critical unit prices;
- quantities;
- productivity;
- wages;
- Social Charges;
- materials and equipment;
- site administration;
- mobilization/demobilization;
- BDI and taxes;
- insurance and guarantees;
- schedule;
- execution methodology;
- risk allocation matrix;
- supplier documentation;
- additional guarantee under §5;
- final justification.
Final considerations
The 75% parameter is an objective trigger established by Law 14,133 for public works and engineering services, but the decision on a bid below that threshold must be built with attention to current case law and the evidence in the specific case. The TCU has recognized, in relevant decisions, the possibility of demonstrating feasibility, while divergent interpretations also remain on record.
The safest response is procedural and technical: reliable budget, clear notice, targeted due diligence when appropriate, analysis of relevant costs and a reasoned decision. The lowest price is advantageous only when it can deliver the complete scope with quality, schedule and contractual obligations covered.
Technical references
[1] BRAZIL. Law No. 14,133, of April 1, 2021. Public Procurement and Administrative Contracts Law. Arts. 11, 56, 59 and 63. Available at: https://www.planalto.gov.br/ccivil_03/_ato2019-2022/2021/lei/l14133.htm
[2] FEDERAL COURT OF ACCOUNTS — TCU. Decision 465/2024-Plenary. Unfeasibility; art. 59, §4; rebuttable presumption and opportunity for demonstration. Available at: https://pesquisa.apps.tcu.gov.br/documento/publicacao/exequibilidade/%2520/DTRELEVANCIA%2520desc/5
[3] FEDERAL COURT OF ACCOUNTS — TCU. Decision 803/2024-Plenary. 75% criterion and possibility of demonstrating feasibility. Available at: https://pesquisa.apps.tcu.gov.br/documento/jurisprudencia-selecionada/dilig%25C3%25AAncia%2520exequibilidade/%2520/score%2520desc%252C%2520COLEGIADO%2520asc%252C%2520ANOACORDAO%2520desc%252C%2520NUMACORDAO%2520desc/6/sinonimos%253Dtrue
[4] FEDERAL COURT OF ACCOUNTS — TCU. Decision 2494/2024-Plenary. Discussion of art. 59, §§2 and 4 of Law 14,133/2021. Available at: https://pesquisa.apps.tcu.gov.br/doc/acordao-completo/2494/2024/Plen%C3%A1rio
[5] FEDERAL COURT OF ACCOUNTS — TCU. Decision 2460/2025-Plenary. Feasibility analysis of a bid below 75% and due diligence. Available at: https://pesquisa.apps.tcu.gov.br/doc/acordao-completo/2460/2025/Plen%C3%A1rio
[6] FEDERAL COURT OF ACCOUNTS — TCU. Decision 2461/2025-Plenary. Demonstration of feasibility and additional guarantee in a bid with a high discount. Available at: https://pesquisa.apps.tcu.gov.br/doc/acordao-completo/2461/2025/Plen%C3%A1rio
Frequently asked questions
Art. 59, §4 states that bids below 75% of the budget shall be considered unfeasible. However, TCU decisions such as Decisions 465/2024 and 803/2024 treated the criterion as a rebuttable presumption and allowed an opportunity for demonstration. The decision must consider case law, the notice and the specific case.
Multiply the Administration’s budget by 0.75. For a R$ 10 million budget, the threshold is R$ 7.5 million. The statutory text refers to values below 75%, so exactly 75% is not below the parameter.
Total price, quantities, relevant unit prices, materials, equipment, labor, Social Charges, productivity, site administration, BDI, schedule, execution methodology and contractual risks.
It may request evidence proportionate to the points of doubt, including quotations, contracts, invoices, cost compositions and supply commitments, provided that due diligence is not used to allow a material change to the proposal.
Not under the objective criterion in §4, because 80% is above 75%. However, because it is below 85%, the winner is subject to the additional guarantee under art. 59, §5.
If it is accepted as feasible in the specific case, yes. Because it is also below 85%, the additional guarantee equal to the difference between the budget and the bid value applies.
Yes. That is why the analysis must also verify the baseline itself. Many bids concentrated in a range far below the estimate may signal a budget problem, although this alone does not prove the estimate is wrong.
The decision belongs to the Administration in the procurement process and must be properly reasoned. Technical teams or consultants may support the engineering, cost, method, productivity and schedule analysis.
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