on a daily base (basis)

Writers mix base and basis because they look related but play different roles. Use base for a physical support or the verb "to base"; use basis for a reason, principle, or abstract foundation. Below are clear rules, plenty of examples, quick rewrites, and short checks to catch mistakes before you send.

Quick answer

Use basis for abstract foundations or reasons (for example: on a daily basis; no factual basis). Use base for a physical support, location, or the verb "to base" (for example: the statue's base; we based our plan on the survey).

basis = reason / abstract foundation (plural: bases)
base = physical support / location OR the verb "to base"
Remember the idiom: "on a daily basis" (not "on a daily base")

Core explanation: when to choose each word

Basis names an abstract reason or principle: "on the basis of", "no factual basis", "on a weekly basis". Base is either a concrete noun (a support or place) or the verb meaning "to found on": "a military base", "we based our estimate on last year's sales".

If you can substitute reason or foundation, use basis.
If you mean something you can touch, a place, or the verb sense, use base.
Concrete: "The lamp sits on a wooden base." - Abstract: "Her argument has no factual basis."

Real usage by context: work, school, casual

Formal writing frequently uses basis in set phrases; casual speech often prefers simpler wording like "every day" or "because". Use the option that matches tone and clarity.

Work: "On a monthly basis, the team submits the KPI report." / "We based the budget on last quarter's revenue."
School: "The hypothesis lacks an empirical basis." / "Place the beaker on the metal base before heating."
Casual: "I call my parents every day." (less formal than "on a daily basis") / "He works at the army base near town."

Common wrong → right pairs (copy-paste fixes)

Use these quick swaps when you spot the wrong word.

Wrong: "I check my email on a daily base." →
Right: "I check my email on a daily basis."
Wrong: "We meet on a regular base to review progress." →
Right: "We meet on a regular basis to review progress."
Wrong: "His theory has no factual base." →
Right: "His theory has no factual basis."
Wrong: "On the base of your calculations, the project will break even." →
Right: "On the basis of your calculations, the project will break even."
Wrong: "There is no scientific base for that claim." →
Right: "There is no scientific basis for that claim."
Wrong: "We based our strategy on a weak basis." →
Right: "We based our strategy on weak evidence." (or "on a weak basis" if you prefer)
Wrong: "Place the instrument on a measuring basis." →
Right: "Place the instrument on the measuring base."
Wrong: "They operate from a forward bases." →
Right: "They operate from forward bases."
Wrong: "On basis of the report, we proceed." →
Right: "On the basis of the report, we will proceed."
Wrong: "Daily-base checks are required." →
Right: "Daily checks are required." or "Checks are required on a daily basis."

Practical next steps

Build a tiny habit: when you write set phrases, pause and check the word. Run a few recent sentences through a grammar tool or apply the quick checks below to catch slips fast.

Fix your sentence: step-by-step rewrites

Three simple steps: 1) Decide whether you mean physical/support/verb or reason/foundation. 2) Choose base (physical/verb) or basis (reason). 3) If it sounds clumsy, rewrite with "based on", "because", or a simpler phrase like "every day".

Swap the suspect word with "reason" - if it fits, use basis.
Use "based on" for clear verb phrasing.
Prefer "every day" or "each week" in casual texts.

Wrong: "She updates the spreadsheet on a weekly base." →
Rewrite: "She updates the spreadsheet on a weekly basis."
Wrong: "On the base of the survey, we recommend changes." →
Rewrite: "Based on the survey, we recommend changes."
Wrong: "His theory has no factual base." →
Rewrite: "His theory has no factual basis."
Correct: "We will decide on a case-by-case basis." → Casual
alternative: "We'll decide case by case."
Wrong: "Daily-basis checks required." →
Rewrite: "Daily checks are required." or "Checks are required on a daily basis."
Wrong: "Base your argument off anecdotes." →
Rewrite: "Base your argument on data, not anecdotes."

Memory trick: a fast way to remember

Mnemonic: basis ends with -is → "basis = is the reason." Base is shorter and physical - it holds something up. Use the swap test: replace the suspect word with "reason" or "foundation"; if it fits, use basis.

basis = "is" (reason); base = physical/verb.
When in doubt, rewrite with "based on" (verb) or "because" (casual).

Try your own sentence

Test the whole sentence rather than the phrase in isolation: context usually makes the correct choice clear.

Hyphenation & spacing: compounds and set phrases

Do not hyphenate "on a daily basis." Many compounds with base are single words (baseline, baseboard). Avoid ad hoc forms like "daily-base" or "daily-basis" - choose established words or a simpler phrase.

Correct: "on a daily basis" (no hyphen).
Correct compound: "baseline" as one word when referring to a starting point.
Avoid: "daily-base", "daily-basis", "on basis of" (use "on the basis of").

Grammar notes: plural forms, articles, and verb use

The plural of basis is bases (pronounced "bay-seez"). Use the article with the idiom: "on the basis of" - "on basis of" is not idiomatic. As a verb, base takes standard forms: base, based, basing. As a noun, base can be countable ("a base of operations") or uncountable in chemistry ("a strong base").

basis → bases (not "basises").
Use "on the basis of" with the article.
Verb example: "The report is based on interviews with clients."

Similar mistakes to watch for

Writers also confuse basis with grounds or foundation, or mix up noun and verb forms. Grounds often sounds legal; foundation implies deeper structural support. If unsure, rewrite with "based on" or "because".

grounds vs basis: both mean "reason"; grounds is often legal/formal.
foundation vs basis: foundation suggests deeper structural support; basis is more general.
When stuck, prefer "based on" (verb) or "because" (casual).

Wrong: "On base of the contract, we will proceed." →
Right: "On the basis of the contract, we will proceed."

Editing checklist: catch this error quickly

Five quick checks to spot base/basis mistakes in seconds.

Replace the suspect word with "reason" or "foundation" - if it fits, use basis.
If the sentence names a physical support or location, use base.
For action phrases, consider "based on" instead of "on the basis of" for readability.
Check set phrases: "on a ____ basis" should use basis and include the article where needed.
Read the sentence aloud - awkward phrasing often reveals the wrong choice.

Quick test: "We hired her on the basis of her portfolio." (Replace "basis" with "reason" - it fits.)

FAQ

Is it "on a daily base" or "on a daily basis"?

Use "on a daily basis." The idiom requires the abstract noun basis to indicate frequency; "daily base" is incorrect here.

When should I use base instead of basis?

Use base for physical supports or locations (a statue's base; a military base) and for the verb "to base" (we based our plan on the survey). Use basis for reasons, principles, or abstract foundations.

What's the plural of basis?

The plural is "bases" (pronounced "bay-seez").

Can I always replace "on the basis of" with "based on"?

Yes - both are correct. "Based on" often reads more naturally; choose based on rhythm and formality.

Are "grounds" and "basis" interchangeable?

They overlap: both mean "reason." "Grounds" often sounds legal or formal ("grounds for dismissal"), while "basis" is neutral and general.

Want a fast sentence check?

Paste your sentence into a grammar tool or run the editing checklist above. One quick habit - pause whenever you type "on a ___ basis" and confirm you used "basis" - prevents most mistakes.