Royal Mail won’t publish its last posting dates for Christmas 2026 until around October.
If that announcement is the moment you plan to start thinking about this, you are already two months behind, and you’ll be planning against a deadline that was never yours in the first place.
The posting deadline tells you when something will technically arrive before the 25th. It tells you nothing about whether anyone will be there to open it.
The calendar is fixed, and this year it’s mean
Christmas Day 2026 falls on a Friday.
That makes the week of Monday 21 December a write-off for anything B2B. Skeleton staff, out-of-office replies, the person you wrote to already gone until January. Anything landing that week sits in a tray next to the recycling, and a Christmas card read on 4 January isn’t a Christmas card. It’s an apology with a robin on it.
Go back a week and you reach Friday 18 December, which is roughly when people stop starting things.
So, the window you’re actually aiming for is the first two weeks of December. Monday 30 November to Friday 11 December. That’s when a card gets opened by the person it was written for, read properly, and then stood on a shelf where it stays for a month next to four printed ones that came in the same post.
Everything else in this piece works backwards from those two weeks.
The post itself has changed, and most marketing plans haven’t caught up
This is the bit that catches people out, because the assumption underneath most direct mail planning is about five years out of date.
Since July 2025, Second Class letters are delivered on alternate weekdays. Monday, Wednesday and Friday one week, Tuesday and Thursday the next. No Saturdays. The aim is within three working days rather than the next one.
Standard bulk business letters moved to that same three-day aim. If you are sending a Christmas campaign at volume, that is the service you are on.
And the reliability target for it is 95% within three weekdays, reduced from 98.5%. Read that properly. One in twenty falling outside the window is not a failure of the system. It is the system, working as designed.
Now add December, which is the highest volume month of the year for the entire network.
If your plan is “post it early December, it’ll be fine”, your plan has a three-day aim, a one-in-twenty tolerance and the busiest fortnight in the postal calendar sitting between it and the doormat.
The dates that are yours
Everything above is fixed and public. You can check all of it. What follows is the part nobody else can do for you, and it’s where Christmas campaigns actually die.
Your data.
Names, spellings, job titles, the eleven people who left in March and are still sitting in your CRM. Handwritten direct mail is unforgiving about this in a way email never was. A misspelled name in an inbox is a typo. A misspelled name in real ink is a statement about how much attention you were paying.
Your own sign-off.
Not the writing. Not the printing. The four days waiting for someone to come back on the wording, then two more because they were away, then the small change on a Friday afternoon that pushes the whole thing into the following week. Every business underestimates its own approval process, and it is the only stage on the list that no supplier can speed up for you.
Our lead time.
I’m not going to invent a number here, because it varies by volume, by product, by how much of the writing you’re handing over. What I will tell you is the question you have to ask: what is your cut-off for Christmas, and what do you need from me by when?
Ask it in September to receive help before November.
For charities, move all of it earlier again. Charity direct mail at Christmas is competing with every other appeal landing in the same fortnight, and the appeals that work were planned over the summer, not squeezed in behind the autumn campaign.
The uncomfortable version
Most businesses don’t miss Christmas because they forgot about it. They miss it because November feels like the right time to think about December.
It isn’t. November is when it goes in the post. October is when it gets made and signed off. September is when it gets decided.
There’s a reason the same handful of companies send handwritten cards for business every year and everyone else means to. It isn’t budget and it isn’t taste. It’s that one group had the conversation in September and the other group waited for Royal Mail to tell them what the deadline was.
You still have time. That is the entire reason for publishing this in August instead of in November, when it would have been a nice piece of writing about something you could no longer do.
If you want handwritten mail landing while your customers are still at their desks, this is the month to talk about it. Book a chat or make an enquiry, and we’ll work the dates backwards from your list.
