missing hyphen in 'money back guarantee'

When two or more words work together to describe a noun that immediately follows them, bind those words with hyphens: money-back guarantee, full-time job, ten-year plan. Missing hyphens can change meaning or slow a reader down.

Below: the core rule, concrete rules for numbers and -ly adverbs, spacing and dash distinctions, many wrong/right pairs, ready-to-use sentences for work, school, and casual writing, quick rewrites, a memory trick, and common nearby mistakes.

Quick answer

Hyphenate multiword adjectives that come before the noun they modify (money-back guarantee). If the same words come after the noun, usually leave the hyphen off (the guarantee is money back). Never put spaces around a hyphen.

Before a noun: hyphenate (money-back guarantee).
After a noun (predicate): usually no hyphen (the guarantee is money back).
No spaces around hyphens: money-back, not money - back.
Exception: adverb ending in -ly + adjective → no hyphen (highly regarded study).

Core rule: compound modifiers before a noun

If two or more words jointly describe a noun and appear immediately before it, link them with hyphens so the reader treats them as a single adjective: money-back guarantee, full-time employee, ten-year contract.

If the modifier follows the noun, don't hyphenate: The guarantee is money back; she works full time.

Pattern: [word + word + ...] + noun → hyphenate the modifier.
If meaning is unclear without a hyphen, hyphenate for clarity even if a style guide is flexible.

Hyphenation rules and grammar edge cases

Numbers: hyphenate spelled-out compound numbers used as adjectives (ten-year plan, five-year study).

Adverbs: do not hyphenate when the first word is an -ly adverb (highly regarded researcher).

Prefixes and evolving compounds: use hyphens for clarity or when base words are capitalized (re-elect, pro-American). Some compounds become closed (email) or remain hyphenated; follow your style guide when unsure.

Spell-out numbers as modifiers → hyphenate (twenty-one-year-old student).
-ly adverb + adjective → no hyphen (poorly written memo).
For technical or legal text, prefer hyphenation to avoid ambiguity.

Usage: Correct: a ten-year contract;
wrong: a ten year contract.
Usage: Correct: a highly regarded study (no hyphen).
Usage: Correct: re-elect the chair; style may vary.

Spacing and dash vs. hyphen

A hyphen (-) connects words with no spaces: money-back. An en dash (-) indicates ranges (2019-2021) and sometimes relationships (New York-London flight). An em dash (-) sets off a clause. Don't replace hyphens with dashes, and don't add spaces around hyphens joining words.

Hyphen (no spaces) for compounds. En dash for ranges. Em dash for breaks in thought.
If your editor converts hyphens into dashes, check whether an en dash or em dash is intended.

Wrong: This is a money - back offer.
Right: This is a money-back offer.
Wrong: 2019-2021 (typed with a hyphen when an en dash is preferred).
Right: 2019-2021 (use an en dash for ranges).

Concrete wrong/right pairs (practice these)

Compact wrong/right examples you'll repeatedly see. Use the right form as a template.

Wrong: We offer a money back guarantee. -
Right: We offer a money-back guarantee.
Wrong: She has a full time schedule. -
Right: She has a full-time schedule.
Wrong: He completed a ten year plan. -
Right: He completed a ten-year plan.
Wrong: This long term solution will help. -
Right: This long-term solution will help.
Wrong: Our day to day tasks changed. -
Right: Our day-to-day tasks changed.
Wrong: Claim a tax free refund. -
Right: Claim a tax-free refund.

Try your own sentence

Test the whole sentence rather than isolating the phrase. Context usually makes the right choice clear.

Real usage: work, school, and casual examples

Copy-and-paste templates for emails, reports, posts, and listings. Each example shows the hyphenated modifier before the noun.

Work: Please include the money-back guarantee clause in the vendor contract.
Work: We're hiring a full-time product manager to start Q3.
Work: The appliance has a ten-year motor warranty.
School: Submit a five-year longitudinal study proposal by Friday.
School: Attach a one-paragraph abstract to your full-time internship report.
School: Keep a day-to-day lab notebook for reproducibility.
Casual: They offered a money-back policy when I bought the headset.
Casual: We've been long-term friends since college.
Casual: Grab a tax-free bargain at the mall this weekend.

How to fix your sentence: quick diagnostics and rewrite patterns

Checklist: 1) Is the phrase before a noun? If yes, hyphenate. 2) Does an -ly adverb precede the adjective? If yes, do not hyphenate. 3) If the phrase follows the noun, drop the hyphen or reword.

If unsure, hyphenate for clarity in contracts and academic writing.
Alternative rewrites: move the phrase after the noun, add of, or convert to a noun phrase.

Rewrite:
Wrong: We provide a money back guarantee. →
Right: We provide a money-back guarantee. - Alternate: Our guarantee includes a full refund.
Rewrite:
Wrong: The team completed a ten year plan. →
Right: The team completed a ten-year plan. - Alternate: The team completed a plan that covered ten years.
Rewrite:
Wrong: She needs a part time position. →
Right: She needs a part-time position. - Alternate: She needs a position that is part time.
Rewrite:
Wrong: We launched a day to day update. →
Right: We launched a day-to-day update. - Alternate: We launched daily updates.

Memory trick and a one-line rule to keep

Memory trick: "Before = Bind, After = Free." If the words sit before the noun, bind them with hyphens. If they come after, let them stand free.

One-line rule: Hyphenate multiword adjectives directly before a noun; drop or rephrase them when they come after.

Think: Before = Bind (hyphen). After = Free (no hyphen).
When in doubt for professional writing, bind (hyphenate) to prevent ambiguity.

Similar mistakes to watch for

Common adjacent errors: hyphenating adverb + adjective (-ly), using en/em dashes instead of hyphens, adding spaces around hyphens, and misapplying hyphens to evolving compounds (email vs e-mail).

Also watch headline-style omissions: headlines sometimes drop hyphens for space; don't adopt that in body copy or contracts.

Adverb + adjective (adverb ends with -ly) → no hyphen.
En dash for ranges (2019-2021), not for compounding.
Closed/compound evolution: check a dictionary or your style guide (email vs e-mail).

Usage: Correct (no hyphen): a badly designed interface (adverb + adjective).
Usage: Wrong: use an en dash for ranges but don't use it to connect words.
Usage: Watch: email is the common modern form; e-mail is older style.

FAQ

Do I hyphenate "money back" in "money-back guarantee"?

Yes-when the phrase modifies a noun directly and comes before it, write money-back guarantee. If the phrase follows the noun (The guarantee is money back), you can leave the hyphen off.

Should I hyphenate numbers like "ten year plan"?

Spell-out numbers used as adjectives should be hyphenated: ten-year plan. If the number follows the noun or is part of a predicate, hyphens are usually unnecessary.

When should I avoid hyphens with adverbs?

If the first word is an adverb ending in -ly (e.g., highly regarded), do not hyphenate. Hyphenating in those cases is incorrect.

Is it okay to avoid hyphens in casual writing?

Casual writing often drops hyphens and can remain readable. But if dropping the hyphen creates ambiguity, add it. For professional, legal, or academic text, prefer hyphenation for clarity.

What's the fastest fix if I'm unsure?

Either hyphenate the pre-noun modifier (safe for professional text) or rewrite the sentence so the modifier follows the noun or uses of (e.g., a guarantee for refunds), which avoids the hyphen question.

Need a quick check?

For contracts and academic work, prefer the hyphenated form when a phrase precedes the noun. Use the one-line rule: "Before = Bind, After = Free."