Most students think grammar mistakes don't matter much in Task 1. They cost you more than you think. The IELTS band descriptors are clear: Grammatical Range and Accuracy accounts for 25% of your Task 1 score. That's a quarter of your total mark.
A Band 5 writer makes frequent errors that cloud the meaning. A Band 8 writer uses complex structures with barely any mistakes. The gap between those two levels isn't about talent. It's about knowing what to hunt for and catching it before you hit submit.
You'll learn which grammar mistakes trap 80% of test-takers, what errors actually tank your band score at each level, and how to use an IELTS writing checker without becoming dependent on it. Let's go.
Task 1 is tight. You've got roughly 150 words to describe a chart, graph, map, or process. When you're working with so few words, each one carries weight. A single subject-verb agreement error in a 160-word response hurts you more proportionally than the same error buried in a 400-word Task 2 essay.
But here's what surprises most people: examiners don't expect perfection. They're looking for control. The band descriptors say Band 8 allows "rare errors"—not zero errors. Band 7 gets "occasional errors" as long as meaning stays clear. Band 6 has "some errors" but the reader still understands what you're saying.
Real talk: Target high-impact errors, not perfection. A tense shift that breaks your paragraph's logic hurts way more than a tiny preposition slip that doesn't affect clarity.
That mindset shift changes everything. You're not hunting for every tiny slip. You're hunting for errors that make examiners wonder if you can actually control grammar in English.
If you're hovering in Band 5-6 territory, you're probably repeating the same handful of mistakes. These are preventable IELTS writing task 1 grammar errors that a grammar checker catches instantly, but your brain skips over under time pressure.
Band 5: "The data shows that both men and women has increased their online shopping habits."
Band 7: "The data show that both men and women have increased their online shopping habits."
This one appears constantly in lower band essays. Your subject is plural (data, men and women), but your verb stays singular. It happens because you're writing fast and your brain skips over it. When you check grammar in IELTS Task 1 responses, this error pattern shows up repeatedly.
Band 5: "In 2015, the sales reached 45 million pounds. By 2020, it rises to 78 million, and forecasts suggest it will reach 120 million by 2025."
Band 7: "In 2015, the sales reached 45 million pounds. By 2020, they had risen to 78 million, and forecasts suggested they would reach 120 million by 2025."
The weaker version bounces from past to present to future without logic. You're describing historical data, so past or past perfect tense makes sense. Examiners see this as sloppy control. It happens when time pressure kicks in and you skip the re-read.
Band 5: "A chart shows increase in tourism. The increase was significant."
Band 7: "The chart shows an increase in tourism. The increase was significant."
In the first version, you've dropped the article before "chart" when you shouldn't. You're talking about a specific chart in front of you. Also, "increase" is a noun here, so it needs "an." Band 6 writers stumble on this constantly, and it's one of the most common IELTS writing task 1 grammar errors.
Band 5: "The graph about the sales of computers shows the growth rate from 2010 to 2020 in the UK market."
Band 7: "The graph displays the growth in UK computer sales from 2010 to 2020."
The first one isn't technically wrong, but it sounds clunky. Examiners associate this style with lower band scores. You're leaning on basic connectors and simple prepositional phrases instead of more sophisticated structures. The second version uses stronger verbs ("displays") and cuts out the fat.
Band 5: "Germany and France both showed growth. It increased by 15% in the final quarter."
Band 7: "Germany and France both showed growth. Both increased by 15% in the final quarter."
What does "it" point to? Germany? France? The growth itself? It's murky. The examiner has to backtrack and re-read, which costs you Band points. Always make sure your pronouns have a specific noun they're clearly pointing to.
Band 7+ essays aren't flawless. They're strategically ambitious. These writers use complex sentences, subordinate clauses, and varied verb forms, but they don't make careless mistakes that break the reader's understanding.
Here's what sets them apart:
Practical tip: Re-reading takes 2 minutes out of your 20-minute window. It's not optional if you want Band 7+. Spend 60 seconds scanning for subject-verb agreement, tense consistency, and article use in your final pass.
An IELTS writing checker is a tool, not a writing tutor. If you use it to write, then just click "accept" on everything, you won't improve. You need to understand why it's flagging something.
Here's the smart workflow:
A Band 6 writer typically has 8-12 errors per 160 words. A Band 7 writer has 2-3. A Band 8 writer has maybe 0-1. You're not aiming for zero—you're aiming to cut your error rate in half. That's how you move up a band.
Let's walk through an actual IELTS Task 1 and see how correcting grammar mistakes moves your score up.
The prompt: "The bar chart below shows the number of visitors to three museums in New York from 2012 to 2016. Summarize the information by selecting and reporting the main features."
Band 5 Draft (with errors):
"The bar chart show the visitor numbers for three museums in New York over a five-year period. The Natural History Museum were the most popular, with around 5 million visitors in 2012. By 2016, it has increased to 7 million. The Metropolitan Museum start at 4 million and show steady growth, reaching 6.5 million by the end of the period. The Modern Art Museum were the least visited, with numbers staying relatively flat at around 2 million throughout the years. Overall, all museums has experienced growth, particularly the Natural History Museum."
Errors an IELTS writing checker flags:
Band 6-7 Revision (errors fixed + stronger language):
"The bar chart shows the visitor numbers for three museums in New York between 2012 and 2016. The Natural History Museum was the most popular, attracting around 5 million visitors in 2012 before rising to 7 million by 2016. The Metropolitan Museum started at 4 million and demonstrated steady growth, reaching 6.5 million by the end of the period. In contrast, the Modern Art Museum was the least visited, with numbers remaining relatively flat at approximately 2 million throughout these years. Overall, all three museums experienced growth, with the Natural History Museum showing the most substantial increase."
What improved:
That's a realistic Band 5 to Band 6-7 jump. The grammar checker caught the obvious stuff, but the real improvement came from understanding why those errors matter and choosing better vocabulary and structures. If you're working on describing trends accurately in charts and graphs, the same principle applies—fix the grammar foundation first, then layer in sophistication.
You can't fix what you don't see. Start tracking your own patterns. After checking 3-4 practice essays with a tool, build a checklist specific to your weaknesses.
Your checklist might look like this:
Before you finalize any practice essay, run through this checklist. After a few weeks, you won't need to reference it. These errors become rare because your eye trains itself to catch them automatically.
Pro move: Write your checklist on a sticky note and keep it visible during practice. The first 10 times you'll check it constantly. By week 4, you'll spot errors before you even look at the note.
One subject-verb error in 160 words? Possibly a typo. Three subject-verb errors? The examiner thinks you don't understand the rule. This is why an IELTS writing correction tool reveals so much. You think you've got agreement nailed, but the tool flags four instances across two essays. Now you know exactly where to focus.
Band 8 writers have eliminated patterns. They might have one awkward sentence, but they don't have the same error type appearing multiple times in one response. That shows they've actually mastered the grammar required at IELTS level.
You've finished writing. Three minutes left. Don't panic. Use this system:
60 seconds: Tense scan. Every verb should be past tense (or present if describing a process). Highlight any verb that breaks this rule and fix it.
60 seconds: Article check. Do nouns have the right article on first mention? "The chart" (specific). "A museum" (first mention, general). Fix 2-3 obvious ones.
60 seconds: Read opening sentences aloud mentally. Read the first sentence of each paragraph in your head. Does it sound grammatically clean? If something feels off, trust that instinct and fix it. Don't overthink—just catch the obvious errors.
This isn't a thorough proofread. It's a high-impact scan. You'll catch the biggest errors that drag your score down most. In practice, this 3-minute habit can push you from Band 6 to Band 7.
Submit your response and get instant feedback on grammar, band score estimate, and line-by-line corrections. Spot patterns in your IELTS writing mistakes and watch your score rise.
Check My Essay Free