INTJ vs. INFJ: 5 Differences

INTJs and INFJs are two of the most coveted personality types, so it’s common to see people mistyping as one of these types. However, INTJs and INFJs actually mistype as each other as well. Of course, that really isn’t surprising considering that they both share the same dominant function. Having the same priority or dominant drive could certainly make people of these types come across as similar. So, with all that in mind, I’m writing this article on the INTJ vs. INFJ to explain some of the differences. If you’re struggling between INTJ and INFJ, hopefully this article will be helpful to you.

Beware of Bias

These are both idealized types, but there could be some bias in play. For instance, the INFJ is still often called the rarest of the personality types, making it more appealing to some people. In addition, INTJs having the “coldest human” stereotype might dissuade anyone reasonably in tune with emotions from identifying with that type. Or, in the reverse, someone may resist the label of “feeler” preferring to identify themselves as the strategic “mastermind”. For the record, I often see INTJ females mistypes as INFJs. Try your best to set aside any preferences you have so that you can come to the most objectively correct conclusion.

INTJ vs. INFJ: Cognitive Functions

As stated earlier, the INTJ and INFJ share a dominant function: Introverted Intuition (Ni). And of course, since dominant and inferior functions are inextricably linked, INTJs and INFJs also share an inferior function: Extraverted Sensing (Se). Those are their perceiving functions. The difference between these two types lies in their judging functions, which are in the auxiliary and tertiary positions. INTJs have Extraverted Thinking (Te) and Introverted Feeling (Fi), while INFJs have Extraverted Feeling (Fe) and Introverted Thinking (Ti).

In summary, their cognitive function stacks look like this:
INTJ = Ni-Te-Fi-Se
INFJ = Ni-Fe-Ti-Se

INTJ vs INFJ: 5 Differences

Please keep in mind that this article is discussing INTJ vs. INFJ tendencies, not absolutes. Every individual has their own unique combination of behaviors formed by both personality type and life experiences. People don’t often fit their personality type description completely. It’s important to pay attention to what comes most naturally to the you (or the individual in question), so that you can rationally piece together which personality type fits the best.

1. Physical environment vs. Social environment

INTJs and INFJs are both J types, which generally indicates a preference for structure in their environment. J types generally want to mitigate chaos or uncertainties, desiring predictability. However, INFJs and INTJs do this in different ways, due to having different extraverted judging functions (Fe and Te). INTJs, as Te users, focus on a more concrete form of structure, which makes the association more obvious. INTJs typically have a propensity for logistics. They prefer to schedule things, set deadlines, and have clearly defined standards or benchmarks. TJs are good at predicting time cost. In other words, these types are less likely to be late because time ‘got away from them’, so to speak. They set clear goal posts, and draw clear lines. (Many people attribute goal orientation to Ni, but in my experience, what they’re often trying to attribute to Ni is more of a Te trait – since Te values external achievement, which means setting concrete goals, getting tangible or externally-recognizable results, reaching milestones, etc.)

INFJs are focused on the social environment, but don’t confuse that with extraversion. Rather, INFJs are naturally focused on people groups, which can mean society at large, their family, or a small friend group, etc. But remember, this is not so much a focus on individuals as it is a focus on the social structure, in an abstract sense. For instance, shared values connect people together, giving a sense of unity and purpose, but values are abstract. INFJs, as Fe users, are focused on things like group values, the general social climate, harmony, consensus, unity… That sort of thing. FJs often don’t feel very J-like because they frequently run late and feel disorganized, due to not being focused on the more measurable aspects of structure, like time and organization. They’re tending to people’s emotions, their emotions, managing relationships, connecting with others, or just dealing with their own daily stuff, and before they know it, they’re late for something.

2. Rules vs. Etiquette

This point is a natural extensions of the previous point, because it’s a manifestation of the Fe vs. Te focus. Te will surface as a preference for clearly defined rules or standards which people should adhere to. (Don’t mistake this for me saying that INTJs will always be rule followers – but they will tend to want society unified via a clear set of rules or standards.) This ties into the association with Te and efficiency because things are most efficient when everyone is doing things the correct and most efficient way. However, rules also serve to ensure fair and equal treatment. Everyone is subjected to the same rules and standards, and everyone gets punished or rewarded accordingly. It’s logic applied in an objective way.

INFJs, on the other hand, are focused more on social etiquette. An INTJ might strive to achieve social harmony through established rules or completing a critical task, but an INFJ will strive to achieve harmony by focusing on social etiquette. Social etiquette can be a tricky thing, because these types of rules aren’t always spoken out loud… unless you accidentally break one of them. INFJs will be more naturally focused on appropriate social behavior, adjusting their conduct to what’s considered acceptable and/or carefully monitoring their impact on others. They’ll emphasize things like manners, being nice to others, and generally not disturbing the peace. INFJs may be more lax on the rules, catering the standards more to the situation or to people’s feelings. (This is where Ti will come into play, analyzing what is reasonable or adheres to the principle of the matter.) INFJ’s will place the emphasis more on mercy or consensus (i.e. If everyone is okay/happy, we can overlook it this time.)

3. Introverted Feeling in an INTJ vs. Extraverted Feeling in an INFJ

As I mentioned earlier, INTJ female frequently mistype as INFJs because of their emotional awareness or because they’re reasonably empathetic. INTJs are often made out to be “the coldest human”, but that’s far from the truth. These types can have very emotional internal world, due to their introverted feeling function. While INTJs are ultimately thinkers, feeling is not their inferior function, so many INTJs are in touch with it. An INTJ focused on people, perhaps due to an interest in psychology or generally wanting to do good in the world, could easily confuse themselves with an Fe user. However, the difference will be that an INTJ’s feeling function is introverted not extraverted. INTJs may struggle to express that emotion, or demonstrate the same natural warmth that an INFJ does. INTJs may feel their emotions deeply, but it’ll usually take conscious effort to activate their “emotionally expressive mode” Meaning, their default demeanor might be described as colder or more matter-of-fact by an objective observer. INTJs have a very clear idea of what they’re feeling, and they’re emotions are not typically easily influenced by others. Either they feel it, or they don’t.

INFJs, on other hand, have extraverted feeling, which on average makes them come across as warmer than INTJs. It’ll be more automatic for them. I’ve described it as emotional mirroring in the past, and it can look like that to an observer, but that makes the FJs sounds fake. (An unhealthy IFJ might mirror, but in reality, the one’s who are usually consciously mirroring are the TPs.) Empathetic INFJs emotionally sync up with the environment around them, enjoying the shared comradery and sense of community. It’s more accurate to say that they’re absorbing the emotions of those around them, rather than mirroring. People accuse FJs of being fake because sometimes these emotions override the INFJ’s actual feelings, but to the INFJ, it’s very real. The line between what they’re feeling and what everyone else is feeling can blur, becoming one in the same. A less empathetic INFJ will still have a default demeanor that appears pleasant and sympathetic, since their priority is to not disrupt the social environment.

4. Facts vs. Feelings

Since INTJs tend to be disconnected from the emotional environment, their verbal emphasis tends to be on speaking truth or facts. In other words, they can come across as blunt and even rude, at times, because they’re speaking (what they perceive as) simple facts. Maybe they’re sharing information, or perhaps they’re giving people clear instructions because they’re trying to get something done. Either way, INTJs will have a harder time softening their words, especially when they’re locked into task mode. They won’t be as proactively focused on how what they’re saying might be perceived by others. They’re focused more on the task at hand.

Whereas, INFJs will be the opposite. Sure, everyone can be blunt now and again. However, as both introverts and high Fe users, INFJs will be proactively analyzing how what they say aligns with the group’s values and how it might effect people’s feelings. (They’ll judge others in the same fashion.) This will lead them to naturally soften their words, or perhaps say things in a more roundabout or passive aggressive way. It will also lead them to frame what they say as being about others rather than themselves. INFJs tend to be good at deflecting the focus away from themselves, and keeping it on other people. They’ll want to be perceived as selfless. The ones that are not selfish may struggle to clearly communicate their needs/wants, allowing other people’s needs to override their own. (That’ll further perpetuate the passive aggressive problem.) Of course, INTJs can be passive aggressive too, but that’s likely going to be out of an effort to avoid getting tangled up in mess emotions or drama, which eventually builds internal frustration to the point of passive aggressive behavior.

5. Extraverted Thinking in an INTJ vs. Introverted Thinking in an INFJ

This INTJ vs. INFJ article is getting long so I’m only going to touch on this briefly. As mentioned, Te is an objective form of logic, desiring to enact universal standards for all to adhere to, in order to create a well-oiled-machine, so to speak. Te was discussed quite a bit so I don’t think it needs any more coverage, but I didn’t mention Ti at all so I’m going to do that here.

Ti is subjective logic, meaning logic that makes sense to the individual but not necessarily to everyone else. In an INFJ, Ti will combine with Ni, to potentially create a very stubborn individual who believes what makes sense to them with absolutely no proof for it whatever. Bear in mind, the INFJ might not necessarily make a big deal about this to other people, but they may quietly cling to opinions or systems that they can’t logically justify to others, but make complete sense to them. Their Ni may fixate on some underlying idea or pattern, and they’ll find a way to rationalize it to themselves. Because their Ti is tertiary, they may not bother to share the rational for this opinion with others, or they may politely dismiss anyone who tries to point out flaws in their logic.

INTJs will have Ni ideals or ideas, but they usually have an easier time producing concrete data or facts that they can share with others to help support the leap, even if it still seems like a leap. They’ll also be more adaptable to facts, if there are facts that clearly disprove their theory. Essentially, when dealing with an INTJ, you’re more likely to see someone with a handful of facts that made a huge leap based on those facts, so you can see the data but you’re not quite sure it’s enough to reach the conclusion that the INTJ reached. INFJs will struggle with being a bit more abstract then that, where they have to figure out how to piece together their logic into something others can understand.

In Conclusion…

Honestly, the majority of the above article was essentially Te vs. Fe differences, because that’s the core distinction between these INFJs and INTJs. Obviously, there are more differences than the ones I outlined above, but people have written whole books on these types and this is only a single article. If you’d like to read about the subject further, check Fe vs. Te: Am I an FJ or a TJ? Leave your thoughts in the comments!