30+ Best Collections Email Subject Lines [2024]

Updated: January 20th, 2022

If you're looking to boost your email open rates and increase sales, your email subject line is the first (and most important) step in achieving those goals.

Did you know that 33% of email recipients open emails because of an engaging subject line?

That's why it's critical to craft a catchy email subject line that will get you the traffic and conversions you deserve.

We've put together a list of 30+ best collections email subject lines [2024].

Some are proven examples from other successful campaigns, and some are creative ideas to inspire you.

Creative Email Subject Line Ideas

  • Renew your membership today to get a sweet treat from us and {your subscribers’ favorite treat or donut shop}
  • Reminder, don’t forget to join us and bring a friend to {Event Name}
  • Payment reminder: {Business Name} {Invoice no.}
  • Do something today that your future self will thank you for. Register now for an online course
  • Account Number 1234 Payment Needed
  • Hi! {Name}, You may have overlooked paying your bill
  • Response Required: Invoice no. 5436 from 2/15 is overdue- please send payment ASAP
  • Do you Need Any Help Finishing Your Report that was Due Last Friday?
  • Have You Paid Invoice Number 1234?
  • Payment Needed for Invoice Number 1234
  • The countdown to {Event Name} is on!
  • Urgent: Past due invoice {Invoice no.} for {Business Name}
  • Have You Seen This Past Due Invoice?
  • Hey {Name}, are you joining us on Wednesday at {Event Name}?
  • Hey {Name}, Invoice no. 15237 is due today. Your payment will be very much appreciated
  • {Name}’s Reminder for {Event Name}
  • Invoice {number} is due today
  • Invoice {number} from {date} is overdue—please send payment ASAP
  • Hey {Name}, please send your final reports to Betsy Greene by April 1.
  • Payment reminder: Past due invoice {Invoice no.} for {Business Name}
  • From one business to another, here’s an advice
  • Invoice for Account Number 1234
  • [their business name] invoice outstanding [#reference number]
  • Invoice no. 987 is two weeks overdue
  • {Name}, today is the day for {important milestone or meeting}
  • Hi! {Name}, We haven’t received your payment for the overdue amount of
  • {Name}, your discount coupons are about to expire! Use them NOW
  • Invoice {number} is one week overdue
  • Invoice {number} is two weeks overdue
  • Details of confirmation

GUIDE: How To Write A Great Subject Line

As we mentioned above, crafting a catchy subject line is critical to the performance of your email campaign.

While just a few words may seem like a small piece of your overall message, this is the first impression your audience will have before they decide whether to open your email.

If your subject line isn't engaging or appealing enough, there's a chance it could get buried in your reader's inbox.

Let's go over the proven tips on how to craft a subject line that boosts engagement:

What makes a great subject line?

First, let's discuss the fundamentals of creating a great subject line:

  • Spark interest and curiosity
  • A clear and urgent call to action
  • An offer/intriguing discount
  • Personalization (this can be done by sending out different versions of emails to subscribers based on their preferences)
  • Relevance - make sure your subject line covers the current trends and topics within your industry

5 Tips To Crafting a Great Subject Line

Now, let's dive into the specifics of how to create a great subject line for your next campaign:

1. Use a familiar sender name

Although this may seem obvious, it's a piece many marketers miss the ball on.

Your readers want to feel like your email is coming from a human and not a corporation or automated system.

One of the easiest and most effective ways to do this is by changing the sender's name to YOUR name or someone in the company that is well known.

Here's a great example of this from Marketing Examples


Pro Tip

Avoid the "no-reply" sender name at all costs. This makes your email feel unfamiliar, unapproachable, and less personable.

2. Keep your subject short and to the point

If your subject line is too long, it will get cut off, which could impact your reader's chances of opening your email.

The rule of thumb (for both mobile and desktop) is to keep your subject line under 50 characters.

3. Add personal touches to your subject line

If you have access to information about your subscriber (ie. name, location, etc), you can use this to benefit your subject line and catch your readers attention.

It's important not to go overboard here, but adding even the simplest touch such as their name can build trust and rapport.

Here's a great example of a personalized email + offer I received from BarkBox with my dog's name in the subject line:


4. Avoid making any false promises

Your subject line makes a commitment to your reader, so it's important you don't stretch the truth just to simply get more opens and clicks.

In the grand scheme of things, making false promises will end up hurting your open rate as your readers will lose trust in you.

5. Give them a sneak peek of what's inside

Telling your subscriber what is inside helps with open and clicks.

For example, if you're providing your reader with a free guide or e-book, consider making your subject line something along the lines of:

"Your FREE marketing e-book awaits!"


If you want your email campaign to perform well, it all starts with your subject line.

Think about the emails you receive in your inbox and what makes you click vs what gets buried - odds are, the same habits go for your customer.

We hope you enjoyed our guide + list of 30+ best collections email subject lines [2024].

meet the author
Pat Walls

I'm Pat Walls and I created Starter Story - a website dedicated to helping people start businesses. We interview entrepreneurs from around the world about how they started and grew their businesses.