By Alaa Negeda 
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What Is the FAR?
The difference between FAR vs DFARS is one of layers. The Federal Acquisition Regulation is the base rulebook for every federal purchase, codified at Title 48, Chapter 1 of the Code of Federal Regulations. The DFARS is the Defense Department layer that sits on top of it, codified at Chapter 2, and it never replaces the FAR. It implements and supplements it.
That layering is not trivia. It is encoded in every clause number you will ever read, it decides which rules reach a subcontractor who has never dealt with the Defense Department, and it tells you what happens when two clauses appear to disagree.
This guide covers what each regulation is, how to decode a clause number in about five seconds, which DFARS part supplements which FAR part, whether DFARS can reach a non-DoD contract, and what the FAR says when the two conflict.
The Federal Acquisition Regulation is the primary rulebook governing how executive agencies of the United States government buy goods and services. It is codified at Title 48, Chapter 1 of the Code of Federal Regulations, and it applies across the government rather than to any single department.
The FAR is a regulation with the force of law for the agencies bound by it, not a set of suggestions. It sets the policies, the procedures, the solicitation provisions and the contract clauses, and it is the document a contracting officer works from unless something above it says otherwise.
What matters for the comparison is that the FAR anticipates being supplemented. FAR 1.301 permits agency heads to issue their own acquisition regulations that implement or supplement the FAR and that incorporate agency policies, procedures, contract clauses, solicitation provisions and forms. Every agency supplement, DFARS included, exists because the FAR makes room for it.
What Is DFARS?
DFARS is the Defense Federal Acquisition Regulation Supplement, the Defense Department’s layer on top of the FAR. DFARS 201.301(a)(1) states that “DoD implementation and supplementation of the FAR is issued in the Defense Federal Acquisition Regulation Supplement (DFARS),” and DFARS 201.303(a)(i) states that “the DFARS is codified under chapter 2 in Title 48, Code of Federal Regulations.”
The DFARS carries requirements of law, DoD-wide policies, delegations of FAR authority, deviations from the FAR, and policies with a significant effect outside the department.
There is a second document that trips people up. The DFARS Procedures, Guidance, and Information, usually called the PGI, holds everything that does not meet that threshold. DFARS 201.301(a)(2) puts it plainly: procedures, guidance and information that do not meet the criteria for the DFARS “are issued in the DFARS Procedures, Guidance, and Information (PGI).”
The practical consequence is worth internalizing. The PGI is not regulatory. It tells you how a contracting officer is expected to work, which makes it extremely useful for anticipating behavior, but it does not impose an obligation on you the way a DFARS clause in your contract does. Citing the PGI as though it binds you is a common and avoidable error.
FAR vs DFARS: Which One Applies to Your Contract?
Both, if your contract is with the Defense Department. The FAR always applies. DFARS applies in addition, and where DFARS says something different, it does so because the FAR authorized the department to say it.
The FAR sets firm boundaries on what a supplement may do. FAR 1.302 confines agency regulations to those necessary to implement FAR policies within the agency, plus additional policies that supplement the FAR to satisfy the agency’s specific needs. FAR 1.304 goes further and forbids an agency regulation from unnecessarily repeating, paraphrasing or otherwise restating material contained in the FAR, or from conflicting or being inconsistent with FAR content.
Read those two together and the relationship becomes clear. A supplement is not allowed to contradict the FAR, and it is not allowed to duplicate it either. So when you find a DFARS provision on a subject the FAR also covers, it is there to add something specific to defense acquisition, not to restate the base rule. That is a useful reading instinct: ask what the supplement is adding, because by regulation it is not there to repeat.
How to Decode a FAR or DFARS Clause Number
A clause number is not an arbitrary label. It tells you which regulation the clause belongs to, which FAR subject part prescribes it, and whether it has a FAR counterpart at all. Almost nobody explains this, and it takes about five seconds once you know the rule.
Take FAR 52.204-21 and DFARS 252.204-7012 side by side.
- The leading digits identify the regulation. FAR clauses begin 52. DFARS clauses begin 252, because agency supplements carry their CFR chapter number in front. Chapter 2 for the Defense Department gives 252.
- Everything lives in subpart 52.2. FAR 52.101 explains that provisions and clauses begin with 52.2 because their full text appears in subpart 52.2.
- The next two digits are the prescribing part. FAR 52.101(b)(1) states that “the next two digits of the provision or clause number correspond to the number of the FAR subject part in which the provision or clause is prescribed.” So 204 in both examples means the clause is prescribed by Part 4, which covers administrative matters including entity registration.
- The final digits tell you whether the FAR has an equivalent. This is the part people miss, and it is covered in the next section.
What the 7000 Series Tells You Before You Read the Clause
A sequential number of 70 or higher means the clause is agency-unique and has no FAR counterpart. FAR 52.101(b)(2)(ii) requires that for a supplemental provision or clause published in an agency acquisition regulation, “the sequential number shall be ‘70’ or a higher number.” FAR 1.303 says the same thing at the part and subpart level: supplementary material without FAR counterparts uses numbers of 70 and up.
So DFARS 252.204-7012 is a 7000-series clause, which means it is purely a Defense Department creation. There is no FAR clause underneath it doing the same job. Compare that with a DFARS clause numbered below 70 in its sequence, which you should expect to be implementing or modifying a FAR clause that already exists.
That single digit pattern changes how you read a solicitation. A 7000-series clause is a new obligation you may never have seen on a civilian contract. A lower-numbered supplement is a variation on something you already know.
Which FAR Part Does Each DFARS Part Supplement?
The DFARS mirrors the FAR’s part structure with a 2 in front. DFARS Part 219 supplements FAR Part 19, DFARS Part 225 supplements FAR Part 25, and so on. Once you see the pattern, you can find the defense overlay on any subject in seconds.
| Subject | FAR part | DFARS part |
|---|---|---|
| Federal Acquisition Regulations System, agency supplements | Part 1 | Part 201 |
| Definitions of words and terms | Part 2 | Part 202 |
| Improper business practices and conflicts of interest | Part 3 | Part 203 |
| Administrative matters, including SAM registration and CAGE | Part 4 | Part 204 |
| Competition requirements | Part 6 | Part 206 |
| Contracting by negotiation | Part 15 | Part 215 |
| Types of contracts | Part 16 | Part 216 |
| Small business programs | Part 19 | Part 219 |
| Foreign acquisition, including the Berry Amendment area | Part 25 | Part 225 |
| Subcontracting policies and procedures | Part 44 | Part 244 |
The mapping is a navigation tool rather than a promise that every FAR part has a DFARS counterpart. Where the Defense Department has nothing to add, there is no supplement, and the FAR simply stands on its own.
How to Read Section I of a Solicitation
Section I of a solicitation is where the contract clauses live, and it is the section that decides what you are actually agreeing to. Read it in this order:
- Separate the 52 clauses from the 252 clauses. The first group is government-wide FAR. The second is the defense overlay.
- Within the 252 group, pull out everything with a 7000-series sequential number. These have no FAR equivalent and are the obligations most likely to be unfamiliar.
- Check which clauses are incorporated by reference rather than in full text. A clause referenced by number alone binds you exactly as much as one printed in full.
- Identify the flow-down clauses. These are the ones you will have to impose on your subcontractors, and they are where most of the downstream risk sits.
- Note anything numbered against a part you did not expect. A clause prescribed by a part unrelated to your scope is worth a question to the contracting officer before you price the work.
Does DFARS Apply to a Non-DoD Contract?
Not directly. DFARS is the Defense Department’s supplement and it governs Defense Department acquisitions. A contract awarded by a civilian agency carries the FAR plus that agency’s own supplement, not the DFARS.
There is one route by which DFARS obligations reach a company that has never contracted with the Defense Department, and it catches people out constantly: flow-down through a subcontract. If you subcontract to a prime holding a DoD contract, the prime is obliged to pass certain clauses down to you. You are not in privity with the Defense Department, you may never see a DoD contracting officer, and you are still bound by the clauses in your subcontract.
This is why a commercial supplier can find itself holding defense-specific obligations. The obligation did not come from the government. It came from the contract you signed with the prime.
Which Other Agency Supplements Exist?
DFARS is the largest and best known, but it is one of many. FAR 1.303 requires agency-wide acquisition regulations to be published in the Federal Register and codified under an assigned chapter in Title 48 of the Code of Federal Regulations, so each supplement has its own chapter and its own numbering prefix.
The ones a contractor is most likely to meet:
- DFARS, Defense Department, 48 CFR Chapter 2, clauses numbered 252.
- GSAM and GSAR, General Services Administration.
- HSAR, Department of Homeland Security.
- DEAR, Department of Energy.
- HHSAR, Department of Health and Human Services.
- NFS, the NASA FAR Supplement.
- DOSAR, Department of State.
- AFARS and similar, which are service-level supplements sitting below DFARS inside the Defense Department.
The decoding rule from earlier holds for all of them. The prefix identifies the chapter, the middle digits identify the prescribing FAR part, and a 70-and-up sequential number means there is no FAR counterpart.
What Happens When the FAR and DFARS Conflict?
In a FAR vs DFARS reading, start from the rule that a genuine conflict is not supposed to exist. FAR 1.304 states that an agency acquisition regulation shall not conflict or be inconsistent with FAR content, and shall not unnecessarily repeat, paraphrase or otherwise restate material contained in the FAR.
What looks like a conflict is almost always one of three things:
- A supplement, not a contradiction. The DFARS provision adds a defense-specific requirement on top of the FAR rule. Both apply, and the stricter one governs your behavior in practice.
- An authorized deviation. DFARS 201.301 expressly contemplates the DFARS carrying deviations from the FAR. A deviation is not a conflict; it is a departure the department is permitted to make.
- A misread. You are comparing a DFARS clause against a FAR clause that does not actually cover the same ground, which the 7000-series test will usually reveal in seconds.
When the apparent conflict survives all three tests, it is a question for the contracting officer, in writing, before award. Do not resolve it yourself in a proposal and do not assume the more convenient reading.
When Do New FAR and DFARS Clauses Take Effect?
Changes to the FAR are issued through Federal Acquisition Circulars, and changes to the DFARS through the Defense Department’s own rulemaking, both published in the Federal Register as required by FAR 1.303. The effective date is stated in the rule itself.
The point that matters commercially is different: the clause set in your contract is the one in your contract. A rule change does not rewrite an existing award. New clauses reach you at the next solicitation, at an option exercise, or through a modification you sign, which is why the modification is worth reading as carefully as the original contract.
Common Flow-Down Mistakes on DFARS Clauses
Flow-down is where the FAR and DFARS layering turns into real liability, because you are now the one imposing clauses rather than receiving them. The recurring failures:
- Flowing down the entire Section I. Pasting every clause into every subcontract looks safe and is not. It imposes obligations your subcontractor cannot meet, invites refusals and price increases, and signals that nobody read the contract.
- Flowing down nothing and assuming the prime absorbs it. The opposite failure, and the more expensive one. If a clause required flow-down and you did not, the obligation does not disappear. It stays with you.
- Missing that a clause reaches commercial suppliers. Some obligations follow the work rather than the type of supplier, so a commercial vendor with no defense experience can still be in scope.
- Treating the PGI as binding on a subcontractor. It is not regulatory. Imposing it as though it were creates an obligation with no regulatory basis and confuses everyone downstream.
- Not re-checking flow-down after a modification. A modification that adds a clause upstream can create a flow-down obligation you never had, on subcontracts that are already signed.
What Does DFARS Compliance Actually Cost?
There is no official published figure, and any article quoting one without a source is guessing. What can be said honestly is where the cost concentrates.
The expensive DFARS obligations are the 7000-series clauses with no FAR counterpart, because they require something you are not already doing for civilian work. Cost lands in three places: systems and controls you have to put in place, the evidence and record-keeping to show you did, and the recurring effort of imposing and monitoring the same obligations across your subcontracts. The first is a project, the second and third are permanent overhead.
A realistic estimate comes from reading the specific 7000-series clauses in the specific solicitation and pricing them, not from a benchmark figure. Treat any number you are quoted without a citation as marketing.
How to Track Clause Obligations Across a Portfolio
One contract is readable. A portfolio is not, and that is where compliance quietly fails. Three or four awards across different agencies means three or four different supplements, overlapping clause sets, different flow-down obligations and modifications arriving on their own schedules.
What has to be tracked, per contract rather than per company:
- The clause list as awarded, separated into FAR, agency supplement and 7000-series.
- Which clauses carry a flow-down obligation and which subcontracts actually received them.
- Every modification and whether it changed the clause set.
- Recurring reporting duties with their dates, since these are the obligations that lapse silently.
GovOps360 holds the contract record, the clause obligations and the subcontractor relationships in one place, so a modification that changes a flow-down requirement is visible against the subcontracts it affects instead of sitting in a PDF nobody reopens. GovFind finds the opportunity. GovOps360 wins it.
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Frequently Asked Questions
1. Is the FAR law?
The FAR is a regulation codified at Title 48, Chapter 1 of the Code of Federal Regulations, issued under statutory authority. For the agencies bound by it, it carries the force of law in the sense that a contracting officer cannot simply disregard it, and clauses incorporated into your contract are contractually binding on you.
2. Does DFARS replace the FAR?
No. DFARS 201.301 describes the DFARS as DoD implementation and supplementation of the FAR, not a substitute for it. On a Defense Department contract the FAR applies and the DFARS applies on top. FAR 1.304 even forbids an agency supplement from unnecessarily restating FAR material.
3. Where is the official FAR published?
The official text is at acquisition.gov, and the FAR is codified at Title 48, Chapter 1 of the Code of Federal Regulations. Agency supplements including the DFARS are codified under their own assigned chapters in Title 48, as required by FAR 1.303.
4. What does the 7012 in DFARS 252.204-7012 mean?
The 204 means the clause is prescribed by Part 4, and the 7012 means it is agency-unique. FAR 52.101(b)(2)(ii) requires supplemental clauses in an agency regulation to carry a sequential number of 70 or higher, so a 7000-series number tells you there is no FAR counterpart clause doing the same job.
5. Is the DFARS PGI legally binding?
No. DFARS 201.301(a)(2) puts procedures, guidance and information that do not meet the criteria for the DFARS into the PGI instead. It is extremely useful for understanding how a contracting officer will act, but it is not regulatory and it does not create an obligation on a contractor the way a contract clause does.
6. Can a subcontractor be bound by DFARS clauses?
Yes, through flow-down. A prime holding a Defense Department contract is required to pass certain clauses down, so a subcontractor with no direct government relationship can carry defense-specific obligations. The obligation arrives through the subcontract you signed, not from the government.
7. What is the difference between FAR and DFARS clause numbers?
FAR clauses begin with 52 and DFARS clauses begin with 252, because an agency supplement carries its CFR chapter number in front. Both then use the same internal logic: the next two digits identify the FAR part that prescribes the clause, per FAR 52.101(b)(1).
8. Do other agencies have their own FAR supplements?
Yes. FAR 1.301 authorizes agency heads to issue acquisition regulations that implement or supplement the FAR, and FAR 1.303 requires each to be codified under an assigned chapter of Title 48. GSAM, HSAR, DEAR, HHSAR, the NASA FAR Supplement and DOSAR are among the ones contractors meet most often.
References and Sources
All FAR and DFARS citations verified against acquisition.gov on 31 August 2026.
- FAR Subpart 1.3, Agency Acquisition Regulations, including FAR 1.301, 1.302, 1.303 and 1.304
- FAR 52.101, Using Part 52, on the numbering of provisions and clauses
- FAR Part 52, Solicitation Provisions and Contract Clauses
- DFARS Subpart 201.3, Agency Acquisition Regulations, including DFARS 201.301 and 201.303
- Defense Federal Acquisition Regulation Supplement (DFARS)
- DFARS Procedures, Guidance, and Information (PGI)
- FAR Part 44, Subcontracting Policies and Procedures
- Electronic Code of Federal Regulations, Title 48, Federal Acquisition Regulations System
Related reading: the GovCon glossary covers the FAR, DFARS and flow-down entries, and UEI number and CAGE code registration covers the Part 4 and Part 204 territory in the matrix above.
Alaa Negeda
Senior Solution Architect with 23 years of experience in different Technology sectors. Diligent, forward-thinking, and adaptable to dynamic company, customer, and project needs.
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