You could have exactly the right experience for a role. Your accomplishments could be genuinely impressive. Your formatting could be clean and scannable. And a single misplaced apostrophe could still end your chances before anyone reads past the first bullet.
That sounds harsh. But here's the reality: recruiters are not reading your resume the way your college professor read your essays. They're scanning for signals — reasons to keep going or reasons to stop. Resume grammar mistakes are one of the fastest signals they use to filter candidates out. Not because hiring managers are grammar pedants, but because errors on a resume communicate something specific: this person doesn't check their work.
In most professional roles, that's a dealbreaker — not a nitpick.
Here are the seven errors that cause the most damage, why each one is so easy to miss, and a proofreading checklist you can run before every submission.
Why Grammar Errors Hit Harder on Resumes Than Anywhere Else
In an email, a typo reads as rushed. In a Slack message, it's barely noticed. On a resume, it reads as a character trait.
Your resume is the only piece of writing a recruiter will ever see from you before deciding whether you're worth their time. It's a document you had weeks — or months — to prepare. It's presumably your best work. So when an error shows up, it doesn't get the benefit of the doubt.
Hiring managers have described it the same way in survey after survey: a resume with errors suggests the candidate either doesn't notice mistakes or doesn't care enough to fix them. Neither is a quality anyone wants in a new hire.
This matters more than ever in 2026, when AI writing tools have made it trivially easy to produce polished-looking text. Ironically, that's raised the bar: if everyone has access to tools that help write well, there's less tolerance for documents that didn't get a careful pass.
Mistake 1: Tense Inconsistency
This is the most common resume grammar mistake, and it trips up people at every career level.
The rule is simple: current roles get present tense, past roles get past tense. In practice, writers switch back and forth mid-resume — sometimes mid-bullet — without noticing.
Here's what inconsistency looks like:
"Manages quarterly reporting for three regional offices. Developed new tracking system that reduced errors by 40%."
Both bullets are for the same current job. One is present tense, one is past. To a careful reader, it looks like a rough draft that never got cleaned up.
The fix: do a dedicated tense pass after you finish writing. Go section by section. Current job = present tense throughout. Every previous job = past tense throughout. Don't mix them within a single role.
Mistake 2: Its vs. It's (and the Broader Apostrophe Problem)
Apostrophe abuse is so widespread that many people have genuinely lost track of the rules. Let's reset.
- It's = it is. ("It's a high-growth team.")
- Its = belonging to it. ("The company exceeded its revenue target.")
These two get swapped constantly. And there's a wider apostrophe problem on resumes: people add apostrophes to plurals.
"Managed 3 vendor's." No. Vendors. "Increased KPI's by 22%." No. KPIs.
Apostrophes indicate possession or contraction — not plurality. Using them for plurals is one of those resume typos that registers immediately to a detail-oriented reader.
The fix: every time you type an apostrophe, stop for one second and ask: is this a contraction or does this indicate ownership? If neither, delete it.
Mistake 3: Missing Parallel Structure in Bullet Points
This one doesn't get called out as a grammar mistake often enough, but it's one of the most damaging for professional polish.
Parallel structure means that items in a list follow the same grammatical pattern. On a resume, that typically means starting every bullet with a strong action verb in the same tense and form.
Here's what broken parallel structure looks like:
- Managed a team of six direct reports
- Responsible for client onboarding processes
- Revenue increased 18% year-over-year under leadership
The first bullet leads with a verb. The second leads with an adjective phrase. The third leads with a noun. That inconsistency makes the section harder to read and makes the whole document feel unfinished.
Here's the same information with proper parallel structure:
- Managed a team of six direct reports
- Streamlined client onboarding, reducing time-to-activation by 30%
- Grew annual revenue 18% year-over-year
Every bullet now starts with a past-tense action verb. The list has rhythm. It's easier to scan, and it communicates editorial rigor that reflects well on the candidate.
This is one of the most overlooked areas in resume proofreading — and our free resume optimizer flags structural inconsistencies like this automatically.
Mistake 4: Random Capitalization
Walk through any batch of resumes and you'll find this pattern: words capitalized seemingly at random because the writer felt they were important.
"Oversaw Digital Marketing strategy for B2B Clients in the Technology sector."
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Try Free Preview →In standard English, only proper nouns get capitalized — specific names of people, places, companies, and trademarked products. "Digital marketing strategy" is not a proper noun. Neither is "clients" or "technology sector."
Random capitalization patterns make a document look amateurish. They also suggest the writer doesn't have a firm grasp on basic style rules — which is a concern for any role requiring written communication.
There are legitimate capitalized terms on resumes: actual job titles when used as formal designations, software and tool names (Salesforce, QuickBooks, Python), and certifications (PMP, CPA). But when in doubt, lowercase is almost always correct.
The fix: if you're not sure whether something should be capitalized, it probably shouldn't be. Run a search for any common nouns you've been capitalizing out of habit.
Mistake 5: Spelling Errors That Spellcheck Misses
Spellcheck is a helpful first line of defense. It is not a proofreader.
Spellcheck will not catch:
- manger instead of manager
- pubic instead of public (yes, this happens, and yes, it gets noticed)
- form instead of from
- led instead of lead (or vice versa, when you mean the past tense of "to lead")
- principle instead of principal
These are all real words. Spellcheck passes them without comment. But a recruiter reading the phrase "Pubic Relations Manager" is not going to keep reading.
The most reliable way to catch these errors is to read your resume out loud, slowly, word by word. Your brain will auto-correct when reading silently. It's much harder to skip over an error when you're forcing yourself to vocalize every word.
Mistake 6: Comma Splices and Run-On Descriptions
Bullet points should be tight. When a candidate tries to cram too much into a single bullet, the result is often a grammatical mess that loses the reader entirely.
"Led cross-functional team of engineers, designers, and product managers to deliver the new customer portal on time and under budget, which increased user adoption by 45% in the first quarter and reduced support ticket volume significantly."
That's one bullet with four distinct claims buried inside a grammatical tangle. A comma splice (two independent clauses joined by just a comma) makes it worse.
The solution isn't just grammatical — it's structural. Break it up. Lead with the most impressive number. Let each bullet carry one idea.
- Delivered customer portal on time and 12% under budget
- Drove 45% increase in user adoption within 90 days of launch
- Reduced support ticket volume by 30% through improved UX documentation
Three clean bullets beat one complicated one every time.
Mistake 7: Inconsistent Formatting as a Quasi-Grammar Error
This one bends the definition of "grammar mistake" slightly, but formatting inconsistency produces the same effect: it signals that the document wasn't reviewed carefully.
Common formatting slip-ups that undermine first-impression quality:
- Some dates formatted as Jan 2022 and others as January 2022 or 01/2022
- Some bullets ending with periods and others without (pick one and be consistent)
- Different spacing between sections
- Em dashes in some places, hyphens in others, with no apparent logic
None of these individually will kill an application. All of them together paint a picture of a document that was assembled in pieces and never unified.
Attention to detail is one of the most-requested qualities in job descriptions across nearly every industry. Your resume is the first — and sometimes only — opportunity to demonstrate it. Formatting inconsistency directly undermines that signal.
The Resume Proofreading Checklist
Before you submit any application, run through this list. It takes about 10 minutes and will catch the majority of common resume errors.
Tense and Structure
- All current role bullets are in present tense
- All past role bullets are in past tense
- Every bullet in every list starts with the same grammatical form (action verb, same tense)
- No bullet runs longer than two lines
Grammar and Punctuation
- Every apostrophe is used for a contraction or possession — not a plural
- "It's" and "its" are used correctly wherever they appear
- No comma splices in bullet points or summary section
- Capitalization follows a consistent rule (proper nouns only, with exceptions for certifications and software names)
Spelling
- Run spellcheck (catches obvious errors)
- Read the document out loud, word by word (catches spellcheck misses)
- Pay specific attention to job titles, company names, and industry terms
Formatting Consistency
- All dates follow the same format throughout
- Bullet punctuation is consistent (all with periods or all without)
- Section spacing is uniform
- Dashes and hyphens are used consistently
Final Pass
- Ask someone else to read it — a second set of eyes catches what yours have learned to skip
- Read it backward (last bullet to first) to disrupt the pattern your brain expects
A Note on AI Tools and Proofreading
AI writing assistants can be helpful for generating draft language, but they introduce their own errors — and they're often inconsistent with tense, parallel structure, and capitalization in exactly the ways described above.
If you've used any AI tool to help write or edit your resume, do not skip the proofreading checklist. Read everything as if it's new content, because some of it will be. AI-generated text can look polished on the surface while containing structural inconsistencies that signal something is slightly off — even to readers who can't name the specific problem.
When to Ask for Professional Help
If you've been through the checklist, read your resume out loud, and still feel uncertain — or if you've been sending applications without callbacks and can't figure out why — the problem might go beyond grammar.
Our team at RewriteMyResume reviews not just errors, but the full strategic picture: structure, positioning, keyword optimization, and the overall quality of how your experience is communicated. See what a professional rewrite looks like — because sometimes the issue isn't a missing comma, it's a missing narrative.
Grammar is the floor. Your resume also needs to clear it before any of the more interesting work can begin.
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