If you have ever paused mid-sentence wondering whether to write “thus far” or “so far,” you are not alone. These two phrases show up constantly in emails, essays, news reports, and everyday conversation, and most native speakers use them without ever thinking about the rules behind them.
That is exactly why so many learners (and even confident writers) get tripped up. This guide breaks down everything you need to know — meaning, grammar, pronunciation, formality, regional differences, and real examples — so you never have to guess again.
What Do “Thus Far” and “So Far” Mean?
Both phrases describe something that has happened, or is true, up until the present moment. They point backward from “now” to some point in the past, summing up a situation as it currently stands. Think of them as a verbal snapshot: “here is where things stand, up to this point in time.”
The key idea both phrases share is incompleteness with a time boundary. You are not saying something is finished forever — you are saying this is the situation up to now, and it could still change.
Meaning of “Thus Far”
Definition: “Thus far” is an adverbial phrase meaning “up to now” or “up to this point,” typically used in formal or written English.
Word origin: “Thus” comes from Old English “þus,” meaning “in this way.” Combined with “far,” it originally carried the sense of “to this degree” or “to this extent,” and over centuries it settled into its modern time-related meaning of “up until now.”
Pronunciation: /ðʌs fɑːr/ — rhymes with “bus far.” The “th” sound is voiced, like in “this” and “that,” not the unvoiced “th” in “thin.”
Grammar explanation: “Thus far” functions as an adverb of time. It usually modifies the main verb of a sentence and often appears with the present perfect tense.
Example: Thus far, the research team has found no conclusive evidence.
Formal vs informal: Strictly formal. You will see it in academic papers, legal documents, business reports, and official speeches — rarely in casual texting or chatting with friends.
Common mistake: Using “thus far” in casual speech, where it can sound stiff or overly formal, almost theatrical. Saying “Thus far, I haven’t finished my homework” to a friend sounds unnatural.
Correct usage tip: Save “thus far” for writing where precision and formality matter — reports, essays, official updates.
Meaning of “So Far”
Definition: “So far” is an adverbial phrase meaning “until now” or “up to the present time,” used in both formal and informal English.
Word origin: “So far” developed from Middle English usage of “so” as an intensifier combined with “far,” originally describing physical distance (“so far away”) before extending metaphorically to time and degree (“so far, everything is fine”).
Pronunciation: /soʊ fɑːr/ — two clear syllables, stress falls evenly on both words in normal speech.
Grammar explanation: Like “thus far,” it is an adverb of time, commonly paired with the present perfect tense, though it also appears in present simple and past contexts depending on the story being told.
Example: So far, everything has gone according to plan.
Formal vs informal: Completely flexible. It works in a text message to a friend, a business update to your boss, or a scientific report.
Common mistake: Some learners think “so far” cannot be used in formal writing because it “sounds too simple.” That is false — “so far” is perfectly acceptable in professional and academic contexts too.
Correct usage tip: When in doubt, “so far” is the safer, more universal choice.
Thus Far vs So Far — The Main Difference
Here is the core distinction, in one sentence: they mean the same thing, but “thus far” is formal, while “so far” is neutral and works everywhere.
There is no difference in meaning, tense, or grammatical function. The difference is entirely about register — the level of formality appropriate to the situation.
Think of it like the difference between “commence” and “start.” Both mean the same thing, but one belongs in a boardroom and the other belongs everywhere, including the boardroom.
Quick Tip: If you are unsure which one to use, default to “so far.” It is never wrong, while “thus far” can feel out of place in casual contexts.
Side-by-Side Comparison Table
| Feature | Thus Far | So Far |
| Meaning | Up to now | Up to now |
| Formality | Formal only | Formal and informal |
| Common in | Academic writing, legal text, reports | Everyday speech, emails, journalism |
| Pronunciation | /ðʌs fɑːr/ | /soʊ fɑːr/ |
| Tense used with | Present perfect (mostly) | Present perfect, simple present, past |
| Sentence position | Beginning or end | Beginning, middle, or end |
| Sounds natural in texting? | No | Yes |
| Word origin | Old English “þus” (in this way) | Middle English “so” + “far” |
| Interchangeable with “until now”? | Yes | Yes |
Pronunciation and Usage at a Glance
Getting the sound right matters, especially for learners preparing for speaking exams or professional presentations.
- Thus far: two syllables, both stressed evenly — THUS FAR. The vowel in “thus” is short, like “us.”
- So far: two syllables, slightly longer vowel sounds — SO FAR, with “so” rhyming with “go.”
Common pronunciation mistake: Learners sometimes pronounce “thus” with an unvoiced “th,” making it sound like “thuss” mixed with “thin.” Remember: the “th” in “thus” is voiced, the same family as “this,” “that,” and “there.”
Quick Tip: Practice saying “this, that, thus” in a row. If your tongue and voice feel the same buzzing “th” sound in all three, you have it right.
Formal vs Informal English: Which Phrase Sounds Better?
This is where most confusion comes from, so let’s settle it clearly.
Use “thus far” when:
- Writing an academic paper or thesis
- Drafting a legal or government document
- Delivering a formal speech or official statement
- Writing a formal business report
Use “so far” when:
- Texting or chatting with friends
- Writing a casual email
- Speaking in everyday conversation
- Writing blog posts, social media captions, or journalism
- Writing business communication that is professional but not overly stiff
Example comparison:
- Formal: Thus far, the committee has reviewed twelve proposals.
- Everyday: So far, we’ve reviewed twelve proposals.
Both sentences are grammatically correct. The difference is tone, not accuracy.
Common mistake: Using “thus far” in a casual email to sound smart. It often backfires, making the writer sound overly formal or even pretentious in a relaxed context.
Are “Thus Far” and “So Far” Interchangeable?
In almost every case, yes. But there are a few situations where swapping them changes the feel of the sentence, even if the grammar stays correct.
Situations Where They Mean the Same Thing
- Summarizing progress: So far, we’ve completed three chapters. / Thus far, we’ve completed three chapters.
- Describing test results: So far, the results look promising. / Thus far, the results look promising.
- General updates: So far, so good. (Note: “Thus far, thus good” is not idiomatic — see below.)
Situations Where You Shouldn’t Replace Them
- Idiomatic expressions: “So far, so good” is a fixed idiom. You cannot replace it with “thus far, thus good” — it simply is not how the phrase evolved in English.
- Casual dialogue in fiction: If you are writing a character’s spoken lines in a novel, “thus far” will sound unnatural unless the character is deliberately formal, old-fashioned, or highly educated.
- Social media captions: “Thus far” almost never appears naturally in casual online writing; it can come across as forced or ironic.
Quick Tip: If the sentence involves an idiom or casual dialogue, stick with “so far.”
Grammar Rules for “Thus Far” and “So Far”
Correct Tense
Both phrases are most commonly used with the present perfect tense (have/has + past participle), because they describe an action or situation that started in the past and continues to be relevant now.
- So far, she has written two novels.
- Thus far, the company has hired fifteen new employees.
They can also appear with the present simple when describing an ongoing state:
- So far, everything is fine.
And occasionally with past tense when the “now” being referenced is a moment in the past within a narrative:
- So far, he hadn’t said a word. (in past narrative context)
Common mistake: Using “thus far” or “so far” with the simple past when describing a completed, finished action with no connection to the present.
- Incorrect: So far, I finished the report yesterday.
- Correct: I finished the report yesterday. (no need for “so far” since the action is complete)
Sentence Position
Both phrases are flexible and can appear:
- At the beginning: So far, nothing has changed.
- In the middle: We have, thus far, avoided any major issues.
- At the end: Nothing has changed so far.
Quick Tip: Starting a sentence with either phrase creates emphasis and is the most common, natural placement in both speech and writing.
Punctuation Rules
- When “so far” or “thus far” starts a sentence, it is typically followed by a comma: So far, everything looks good.
- When it appears mid-sentence, it is often set off with commas if it interrupts the main clause: We have, thus far, met every deadline.
- When it appears at the end of a sentence, no comma is needed: Everything looks good so far.
Common mistake: Forgetting the comma after an introductory “so far” or “thus far,” which can make the sentence feel rushed or unclear.
Common Sentence Patterns
Here are reliable templates you can reuse in your own writing:
- So far + present perfect: So far, we have completed 80% of the project.
- Thus far + present perfect: Thus far, researchers have identified three possible causes.
- Subject + has/have + thus far/so far + past participle: The team has thus far exceeded expectations.
- So far, so good: The renovation is going well — so far, so good.
- So far as I know / thus far as I know (less common): So far as I know, the meeting is still on schedule.
Quick Tip: Notice how “so far” fits naturally into more casual sentence starters, while “thus far” pairs well with formal subjects like “researchers,” “the committee,” or “the organization.”
Real-Life Examples
Everyday Conversation
- So far, my day has been pretty relaxing.
- How’s the new job going so far?
- We haven’t run into any problems so far.
Business Emails
- So far, the client has approved two of the three design concepts.
- Thus far, our sales figures for this quarter exceed projections.
- Please find attached our progress report thus far.
Academic Writing
- Thus far, the literature has not addressed this specific variable.
- Thus far, no study has replicated these results under controlled conditions.
- So far, the data supports the initial hypothesis.
News & Journalism
- So far, officials have not released a statement regarding the incident.
- Thus far, the investigation has uncovered no new evidence.
- Rescue teams have, so far, recovered twelve survivors.
Social Media Posts
- Loving this new city so far! 🌆
- So far, 2026 has been a wild ride.
- Day 3 of the challenge — so far, so good!
Notice how “thus far” almost never appears in the social media examples. That absence is itself a useful clue about how native speakers naturally sort these two phrases by context.
Common Mistakes and How to Avoid Them
- Mistake: Using “thus far” in texting or casual chat. Fix: Replace with “so far” for a natural tone.
- Mistake: Pairing either phrase with simple past tense for a fully completed action. Fix: Use present perfect, or drop the phrase if the action has no connection to now.
- Mistake: Writing “thus far, thus good” instead of the idiom “so far, so good.” Fix: Memorize “so far, so good” as a fixed expression — it cannot be altered.
- Mistake: Forgetting commas around the phrase in mid-sentence position. Fix: Read the sentence aloud; if there is a natural pause, add a comma.
- Mistake: Overusing “thus far” to sound “smart” in casual writing. Fix: Match your vocabulary to your audience — clarity beats complexity.
Synonyms and Better Alternatives
Formal Alternatives
- Up to this point
- To date
- As of now
- Up until now
- Heretofore (very formal, legal/archaic tone)
Neutral Alternatives
- Until now
- So far
- Up to now
- At this stage
Informal Alternatives
- So far
- Right now
- This far in
- Up till now
Related phrase note: “To date” is especially common in business and financial writing: To date, the company has generated $2 million in revenue.
Thus Far vs So Far in American and British English
Both phrases exist in American and British English with the same meaning, but usage patterns differ slightly.
- American English: Favors “so far” heavily in daily speech and writing, including business contexts. “Thus far” appears mainly in formal reports, legal writing, and academic papers.
- British English: “Thus far” appears a bit more often in formal journalism and official government communication compared to American English, though “so far” still dominates everyday use in both dialects.
Quick Tip: If you are writing for a global or American audience, “so far” is almost always the safer and more natural choice.
Similar Confusing Phrases
So Far vs Until Now
“Until now” and “so far” are close synonyms, but “until now” often implies a change is happening right at this moment.
- Until now, nobody had solved the puzzle. (implies someone just solved it)
- So far, nobody has solved the puzzle. (simply states the current status, no implied change)
Thus Far vs Up to This Point
“Up to this point” is a slightly longer, very formal alternative to “thus far,” often used in structured writing like essays and reports.
- Up to this point, the evidence remains inconclusive.
- Thus far, the evidence remains inconclusive.
These two are essentially interchangeable in formal writing.
So Far vs As Yet
“As yet” is a more formal, slightly old-fashioned phrase usually paired with negative statements.
- As yet, no decision has been made.
- So far, no decision has been made.
“As yet” almost always appears with “no,” “not,” or “hasn’t/haven’t,” while “so far” is more flexible and works in positive statements too.
Memory Trick to Never Confuse Them Again
Here’s a simple trick: think of “thus far” as wearing a suit, and “so far” as wearing jeans.
“Thus” sounds formal and old, like something from a legal document or a professor’s lecture. “So” is short, simple, and casual, like something you’d say to a friend. If your sentence needs a suit (a report, thesis, or official statement), reach for “thus far.” If your sentence is comfortable in jeans (texting, chatting, blogging), reach for “so far.”
Quick Tip: When in doubt, picture the audience. Professor or judge? Use “thus far.” Friend or coworker on Slack? Use “so far.”
Quick Quiz: Test Your Understanding
Try filling in the blank with “thus far” or “so far” — remember, both may be grammatically correct, but think about tone.
- “___, everything has gone smoothly.” (texting a friend)
- “___, the research has yielded no significant results.” (academic paper)
- “How’s the trip going ___?” (casual conversation)
- “___, the committee has reviewed all applications.” (formal report)
- “___, so good!” (fixed idiom — fill in the first word only)
Answers: 1. So far 2. Thus far 3. So far 4. Thus far (or So far, both work formally) 5. So
Frequently Asked Questions
1. Is “thus far” grammatically correct? Yes, “thus far” is completely grammatically correct. It is a formal adverbial phrase meaning “up to now,” commonly used in academic, legal, and professional writing.
2. Can I use “thus far” and “so far” interchangeably? In most cases, yes — they share the same meaning. The main difference is formality: “thus far” fits formal writing, while “so far” works in both formal and casual contexts.
3. Is “so far” formal or informal? “So far” is neutral. It works comfortably in casual conversation, texting, business emails, and even academic writing, making it the more versatile choice.
4. What tense goes with “so far” and “thus far”? Both phrases most commonly pair with the present perfect tense, since they describe something that began in the past and remains relevant now.
5. Is “thus far” old-fashioned? It leans formal rather than outdated. It’s still actively used today in reports, legal documents, and academic writing, just not in casual daily speech.
6. Do I need a comma after “so far”? Yes, when “so far” starts a sentence, follow it with a comma: “So far, everything looks good.” No comma is needed when it ends a sentence.
Final Verdict: Which One Should You Use?
Both “thus far” and “so far” mean the same thing: up to this point in time. The real decision comes down to tone, not meaning. If you’re writing something formal — a thesis, legal document, or official report — “thus far” fits naturally and signals professionalism. For almost everything else, including business emails, conversations, journalism, and casual writing, “so far” is the smarter, more natural choice.
When in doubt, choose “so far.” It works everywhere, sounds natural to every audience, and never risks feeling stiff or forced. Save “thus far” for the moments when your writing truly calls for a formal voice. Mastering this small distinction shows a real command of English register — the kind of subtle skill that separates confident writers from those who are still guessing.
