Invoice Email Open Rate 2026 [Full Data]

No invoicing platform publishes a dedicated “invoice email open rate” benchmark, so the best verified number comes from the email category an invoice actually falls into: triggered, transactional sends. Triggered emails averaged a 45.38% open rate across 4.4 billion messages in 2023, according to GetResponse’s 2024 Benchmarks Report, well above the 39.64% average across every email type the report tracked.

What is the average invoice email open rate?

An invoice email is a triggered send: it fires off a single event (a job finished, a due date arrived), goes to one known recipient, and is expected rather than solicited. That is exactly the category GetResponse’s 2024 Benchmarks Report measured separately from newsletters and one-off campaigns, using 4.4 billion messages sent by its own customers in 2023. Triggered emails averaged a 45.38% open rate, ahead of the 40.08% newsletter average and the 39.64% average across every message type in the dataset.

The same report found autoresponders averaging 51.05% and welcome emails averaging 83.63%, the two highest categories tracked. Both share the trait that matters most for an invoice: the recipient is expecting a specific, single email from a specific sender, not deciding whether to open one of dozens of unsolicited pitches in an inbox. That expectation gap, not clever subject lines, is the main reason triggered categories consistently beat broadcast email.

Figure 1: Triggered emails, the category an invoice belongs to, open well above the newsletter and overall averages, with welcome emails topping the list. Source: GetResponse Email Marketing Benchmarks Report, 2024 (4.4 billion messages sent in 2023).

How does an invoice compare to a typical marketing email?

Invoices sit inside the broader “business and finance” email category most benchmark providers track, and that category behaves differently from the rest of the inbox. Mailchimp’s benchmark data, last updated through December 2023 and drawn from billions of campaigns sent to lists of at least 1,000 subscribers, puts the business and finance category at a 31.35% average open rate, below the 35.63% all-industry average.

The click rate tells a different story. Business and finance emails click at 2.78%, above the 2.62% all-industry average, despite the lower open rate. Recipients in this category open a smaller share of what lands in their inbox, but when they do open a finance-related email, they are more likely to act on it than the average subscriber is. An invoice with a clear payable link is built for exactly that pattern: fewer opens overall than a retail newsletter, but a higher share of those opens converting into a click toward payment.

Figure 2: The business and finance email category opens below the all-industry average but converts opens into clicks at an above-average rate. Source: Mailchimp Email Marketing Benchmarks, data through December 2023.

Why do automated invoice and reminder emails outperform one-off sends?

The gap is not just about opens. Klaviyo’s 2026 Benchmarks report, built from more than 183,000 of its customers, found automated flow emails, the technical category that covers order confirmations, receipts, and scheduled reminders, generate a 5.58% click rate. One-off campaign emails sent to the same lists generate 1.69%, less than a third as much.

An invoice sent through an automated system, with a scheduled reminder cadence behind it, behaves like a flow rather than a campaign in exactly the sense this data measures: it is triggered by a real event, addressed to one known recipient, and carries an obvious, single next action (pay this amount). That structural difference is worth more to a small business chasing payment than any subject-line tweak, since it is measured against click-through, the metric that actually correlates with someone acting on the email rather than merely having it register as opened.

The same pattern shows up inside invoicing data directly, not just general email benchmarks. An analysis of more than 1 million invoices found ones that included the simple phrase “thank you” were paid 89.61% of the time, according to FreshBooks, a wording change small enough to feel trivial next to the automation-versus-campaign gap above but pointing at the same underlying mechanic: the recipient reads and acts on a message that feels individually addressed to them far more readily than one that reads like a template. A scheduled reminder built to look and feel like a single, personal follow-up captures both effects at once, the structural lift of an automated trigger and the tone lift of a message that does not read like a broadcast.

Figure 3: Automated flow emails convert opens into clicks at more than three times the rate of one-off campaigns sent to the same lists. Source: Klaviyo Email Marketing Benchmarks, 2026 (183,000+ customers).

Which email client determines whether an invoice actually gets seen?

Open-rate data for every category above needs one caveat: which email client the recipient uses now matters more than almost anything else in the number. Litmus’s Email Client Market Share data, current as of August 2026 and built from more than 1 billion tracked opens, shows Apple Mail (iPhone, iPad, and Mac combined) handling 62.26% of all opens, with Gmail a distant second at 27.03%, then Outlook at 5.83% and Yahoo Mail at 2.59%.

Apple’s Mail Privacy Protection, active on the majority of that Apple Mail share, pre-loads message images the moment an email is delivered, which registers as an “open” in most tracking systems regardless of whether a person ever actually looks at the message. That means a chunk of every open-rate figure in this post, and in almost every benchmark report published since 2021, is inflated by delivery-time auto-opens rather than genuine reads. Click-through data, which requires a real action, is the more reliable signal for an invoice specifically, since the goal is a paid invoice, not a technically-opened one.

Figure 4: Apple Mail alone accounts for nearly two-thirds of all tracked email opens, ahead of Gmail, Outlook, and every other client combined. Source: Litmus Email Client Market Share, current as of August 2026 (1 billion+ opens).

When are small business owners and clients actually checking email?

Timing gets less credit than the sender’s own reachability. US office workers spend more than 5 hours a day checking email, according to Adobe’s Email Usage Study, split roughly between 3-plus hours on work email and 2-plus hours on personal email, meaning most working adults are already dipping into their inbox throughout the day rather than at one fixed moment. Against that backdrop, GetResponse’s 2024 report found Tuesday narrowly ahead of other weekdays for opens, with two windows, 4 to 6 a.m. and 5 to 7 p.m., outperforming the middle of the day, though the report itself notes the difference between weekdays is small next to the difference between message types.

The practical read: an invoice does not need a perfectly timed send so much as it needs to look like the triggered, single-recipient message the data above shows performs best, since the recipient is very likely checking email again within hours regardless of when it lands.

Figure 5: With more than 5 hours a day spent checking email, most recipients will see an invoice the same day it sends regardless of exact timing. Source: Adobe Email Usage Study.

Comparison: Open and Click Rates by Email Category

Category	Open rate	Click rate	Source
Triggered (invoice-equivalent)	45.38%	not stated	GetResponse, 2024 report
Autoresponder	51.05%	not stated	GetResponse, 2024 report
Newsletter	40.08%	not stated	GetResponse, 2024 report
Business and finance	31.35%	2.78%	Mailchimp, through Dec 2023
Automated flow	not stated	5.58%	Klaviyo, 2026 report
One-off campaign	not stated	1.69%	Klaviyo, 2026 report

Table 1: Figures come from different providers’ own sending data and are not a single unified survey; each row cites its named source.

The Bottom Line

There is no dedicated “invoice email” benchmark on the market, but every adjacent number points the same direction: triggered, single-recipient, automated sends outperform broadcast campaigns on both opens and clicks, and an invoice checks every one of those boxes by design. The bigger lever is not the subject line or the send time, it is whether the email is actually treated as a triggered document with a scheduled follow-up behind it rather than a one-off message someone has to remember to chase manually, especially with 43% of US B2B invoiced sales already running overdue in 2025 (Atradius Payment Practices Barometer, 2025). BillyPaid’s payment reminder tool automates that structure, sending each reminder as its own triggered, individually addressed email on a schedule rather than a single email and a hope.

Frequently Asked Questions

What is a good open rate for an invoice email? No invoicing platform publishes a dedicated invoice-email benchmark, but the closest verified proxy is GetResponse’s triggered-email category, which averaged a 45.38% open rate across 4.4 billion messages sent in 2023, well above the 39.64% overall average and the 40.08% newsletter average in the same report.

Do invoice emails get opened more than marketing emails? Generally yes, because an invoice is a triggered, expected, single-recipient send rather than a broadcast campaign. Klaviyo’s 2026 benchmark report, covering more than 183,000 customers, found automated flow emails get a 5.58% click rate versus 1.69% for one-off campaigns, more than three times higher.

What day and time should I send an invoice for the best chance it gets opened? GetResponse’s 2024 report on 4.4 billion sends found Tuesday edged out other weekdays for opens, with 4 to 6 a.m. and 5 to 7 p.m. as the two strongest windows, though the report itself notes the gap between weekdays is small. Day and time matter far less than whether the email looks like an individually triggered document rather than a template.

Does the recipient’s email app affect whether an invoice gets opened? Yes. Litmus’s email client market share data, current as of August 2026 and based on more than 1 billion tracked opens, shows Apple Mail handling 62.26% of opens. Apple’s Mail Privacy Protection auto-loads images on delivery, which can register an invoice as opened before a human has actually read it, inflating raw open-rate numbers industry-wide.

Sources and References

1. GetResponse - Email Marketing Benchmarks Report (2024), open rate by message type, best day and time to send.
2. Mailchimp - Email Marketing Benchmarks by Industry, business and finance open and click rate, data through December 2023.
3. Klaviyo - Email Marketing Benchmarks (2026), automated flow versus campaign click rate.
4. Litmus - Email Client Market Share, current as of August 2026.
5. Adobe - Email Usage Study, hours per day spent on work and personal email.
6. Atradius - Payment Practices Barometer (2025), US B2B overdue invoice rate.

Note: All figures verified as of September 2026.