When Are Invoices Actually Read? [2026 Data Study]

Invoices sent on a weekend get paid up to 10 days faster than ones sent Tuesday, Thursday, or Friday, per a Vistr analysis of 300,000 invoices cited by FreshBooks. That runs against most invoicing advice, which still assumes weekend email is dead time. The open-rate data backs the surprise: weekend opens now sit within a point of the week’s best weekday.

When during the week are invoices actually opened?

Friday posts the highest average open rate at 49.72%, with Monday at 49.44% and Thursday at 49.2% close behind, per MailerLite’s 2026 analysis of 2.1M+ campaigns across the US, UK, Australia, and Canada, December 2024 to November 2025. What stands out is how little the weekend trails: Saturday and Sunday both land at 48.9%, under a point behind Friday’s peak. That is a thin margin for “never send on weekends” advice to rest on.

Figure 1: Average email open rate by day of week, December 2024 to November 2025. Source: MailerLite, 2026 (2.1M+ campaigns, US/UK/AU/Canada).

What time of day gets an invoice actually read?

Time of day moves the needle more than day of week does. Omnisend’s 2026 research, drawn from roughly 26 billion emails, found several distinct windows clearing 32% or higher: Wednesday at 9am (32.12%), Thursday at 2pm (33.06%), Tuesday at 7am (33.41%), and Sunday at 11am, which posted the single highest open rate in the entire dataset at 33.69%. Tuesday as a whole day averaged a 31.27% open rate with a 0.81% click-to-sent rate, the strongest overall combination Omnisend tracked across the week. None of those four windows fall in the traditional 9-to-5 lunch slot that a lot of invoicing advice still points to, which suggests the old “send it at noon” habit was never based on when inboxes actually get checked. The pattern across these windows points to late morning, on almost any day of the week including Sunday, as the safest general bet for a document that needs eyes on it quickly.

Figure 2: Highest open rate recorded per send window, 2026. Source: Omnisend, 2026 (approx. 26 billion emails analyzed).

Does the day you send an invoice change how fast you get paid?

Reading an invoice and paying it are two different behaviors, and the send-date data suggests they follow different rhythms. Vistr, a cash-flow analytics service, examined 300,000 invoices, split between businesses invoicing weekly or fortnightly and businesses invoicing monthly. Among weekly and fortnightly billers, invoices sent on a weekend were paid roughly 10 days faster than invoices sent on Tuesday, Thursday, or Friday, a gap the FreshBooks blog cited as large enough to override the usual weekday-only advice. Monthly billers showed the opposite pattern: invoices sent on the 1st of the month were paid in 30 days on average, compared with 38 days for the 30th and 37 days for the 31st, most likely because end-of-month invoices compete with a stack of other bills landing in the same accounts-payable batch on the same few days. That distinction matters for anyone setting up an invoicing cadence: the calendar position of the send date can carry more weight than the day of the week it falls on.

Figure 3: Average days to payment for monthly invoices, by send date. Source: Vistr (300,000 invoices), via FreshBooks.

Measure	Figure	Source
Weekend-sent invoice, weekly/fortnightly billers	10 days faster payment	Vistr (300,000 invoices), via FreshBooks
Monthly invoice sent on the 1st vs the 30th	30 days vs 38 days	Vistr, via FreshBooks
Weekend email open rate vs Friday peak	48.9% vs 49.72%	MailerLite, 2026
Highest single open-rate window recorded	33.69% (Sunday 11am)	Omnisend, 2026

Table 1: Invoice timing data at a glance. Each figure traces to a separate named study; they measure different things (email opens vs. payment speed) and should not be added together.

Are weekends really a dead zone for invoicing?

The short answer is no, and the gap keeps narrowing every time this gets re-measured. Weekend open rates in MailerLite’s 2026 dataset reach about 98% of Friday’s peak, a difference small enough that most businesses would not notice it without a controlled comparison. Add in Omnisend’s finding that Sunday 11am was the single best-performing window in its dataset, and the picture flips from “avoid weekends” to “weekends are not meaningfully worse.” That matters directly for invoicing: a freelancer or small business owner catching up on admin on a Sunday afternoon is not sending into a void, and a reminder that lands Saturday morning is not automatically wasted.

Figure 4: Weekend open rate as a share of the week’s peak day. Source: MailerLite, 2026.

What does this mean for payment reminders specifically?

Every finding above points the same direction: a reminder is only as good as the moment it lands in. Business and finance emails, the category invoices and payment reminders sit in, average a 31.35% open rate against a 35.63% all-industry average, per Mailchimp’s benchmark data, so this category already starts from a lower baseline than a typical marketing send. Timing matters more, not less, when the starting open rate is already below average, and a single reminder sent at the wrong hour has less room for error than a promotional email that gets a second and third attempt. Late-morning sends on a weekday, or an early Sunday reminder rather than skipping the weekend entirely, both align with where the real data points rather than where the old advice does. Spreading reminders across a few different windows, rather than resending the exact same message at the exact same hour each time, also gives a client more chances to actually see one.

Figure 5: Weekend-sent invoices get paid roughly 10 days sooner than Tue/Thu/Fri sends, for weekly and fortnightly billers. Source: Vistr (300,000 invoices), via FreshBooks.

The Bottom Line

The data says the old advice about invoice timing is half right. Weekday late mornings still perform well, but weekends are no longer the dead zone they used to be treated as, and for weekly and fortnightly billers specifically, sending on a weekend correlates with getting paid roughly 10 days sooner. Monthly billers see the opposite effect and do better sending early in the month rather than at the end of it. None of this replaces a working reminder cadence: a BillyPaid payment reminder still needs to go out whether an invoice was opened Tuesday morning or Sunday afternoon, and automating that cadence removes the guesswork of picking a single perfect send time by hand.

Frequently Asked Questions

Do invoices sent on weekends really get paid faster? Yes, for businesses invoicing weekly or fortnightly. A Vistr analysis of 300,000 invoices, cited by FreshBooks, found that invoices sent on a weekend were paid roughly 10 days faster than invoices sent on Tuesday, Thursday, or Friday. For businesses invoicing monthly, the pattern flips: sending on the 1st of the month beat sending on the 30th or 31st.

What is the best day of the week to send an invoice? Based on general email open-rate data, Friday, Monday, and Thursday post the highest average open rates (49.72%, 49.44%, and 49.2% respectively), according to MailerLite’s analysis of over 2.1 million campaigns sent between December 2024 and November 2025. Saturday and Sunday are close behind at 48.9% each, a gap of less than one percentage point.

Are weekends really a dead zone for reading invoices? No. Weekend open rates reach about 98% of the week’s peak day, per MailerLite’s 2026 data, and Omnisend’s analysis of roughly 26 billion emails found Sunday at 11am posting the single highest open rate recorded across the send windows it tracked, 33.69%.

What time of day should I send an invoice? Late morning performs best across most studies. Omnisend’s 2026 research found Tuesday 7am (33.41%), Wednesday 9am (32.12%), and Thursday 2pm (33.06%) among the strongest windows, with 8 to 11am the general sweet spot cited across email benchmark reports.

Sources and References

1. MailerLite - The Best Time to Send Email in 2026 (2.1M+ campaigns, Dec 2024-Nov 2025), day-of-week and time-of-day open rate data.
2. Omnisend - The Best Time to Send an Email, 2026 Research (approx. 26 billion emails analyzed), hourly open-rate windows and Tuesday performance.
3. FreshBooks - Is Timing Everything When Sending Invoices? (citing Vistr, 300,000 invoices), weekend vs weekday and monthly send-date payment speed.
4. Mailchimp - Email Marketing Benchmarks by Industry, Business and Finance category open rate and all-industry average.

Note: All figures verified as of August 2026.