Christmas Posting Dates 2026: Mailroom Checklist

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If your business sends invoices, statements, cards or orders through the post in December, the last posting dates decide how much time you have left to get your mailroom ready. This guide sets out the Royal Mail UK last recommended posting dates for Christmas 2026, then walks through a practical checklist for your franking ink, labels and envelopes so you do not run short at the busiest point of the year.

Royal Mail last posting dates for Christmas 2026

Royal Mail publishes last recommended posting dates for UK inland mail each year. For Christmas 2026 they are as follows, and the Post Office lists the same dates for Royal Mail services.

  • Friday 18 December: 2nd Class and 2nd Class Signed For
  • Saturday 19 December: Royal Mail Tracked 48
  • Monday 21 December: 1st Class, 1st Class Signed For and Royal Mail Tracked 24
  • Wednesday 23 December: Special Delivery Guaranteed

These are recommended dates, not guarantees, and Royal Mail notes that they may change. Always check the current version on the Royal Mail website before you rely on them, particularly for remote postcodes, which can need extra time.

Why franked mail needs an earlier internal deadline

A last posting date is the day your item must be handed over, not the day it leaves your desk. Franked mail still has to be sorted, printed, sealed, bagged and collected or taken to a drop-off point. Build in at least a couple of working days of buffer before each date above.

A simple approach is to set an internal cut-off for each service. For example, if 2nd Class mail must be posted by Friday 18 December, ask your team to have it ready for franking by the Wednesday before. That leaves room for a jammed machine, a missing label or an empty cartridge.

A December mailroom checklist

Most December delays in a small mailroom come from supplies, not from Royal Mail. Work through these checks in early November, when there is still time to order and receive what you need.

1. Check your franking ink

Look at the ink level on your machine and work out how many items you send in a typical week. December volumes are often higher for businesses sending invoices, year-end statements and customer cards, so hold at least one spare cartridge. You can find the right one for your model through our Mailcoms inks and labels range or by browsing for your make and model on the store.

If you already have empty cartridges, our refill and reset service is worth considering, and it is covered in detail in our guide to how the refill and reset service works. Allow time for it to be completed and returned before the busy weeks.

2. Stock up on franking labels

Labels are used for parcels and for items too large or too thick to pass through the machine. If you send more parcels at Christmas, your label use will rise with them. Check that you have the correct size for your machine, and see our franking labels collection and our guide to label sizes and types if you are unsure.

3. Count your envelopes

Running out of envelopes mid-week is an avoidable problem. Estimate your weekly use, multiply by the number of weeks until your last posting date, and add a margin. Make sure the envelopes suit your machine, as covered in our envelope buying guide. You can then order from our envelopes collection.

4. Test a print before the rush

Run a few test items and check that the print is clear and complete. If the output looks faint or patchy, it is better to find out in November than on the last posting day. Our article on franking machine print problems covers the usual causes.

5. Confirm your postage balance

Check how much postage credit is loaded on your machine and whether you can top it up quickly. Your machine supplier can advise on the process for your model.

Frequently Asked Questions

When is the last posting date for 2nd Class mail at Christmas 2026?

The last recommended posting date for Royal Mail 2nd Class and 2nd Class Signed For is Friday 18 December 2026. 1st Class and Tracked 24 follow on Monday 21 December, and Special Delivery Guaranteed is Wednesday 23 December.

Do last posting dates apply to franked mail?

Yes. Franked mail is carried through the same Royal Mail network, so the same recommended dates apply. The difference is that you must allow time to frank and prepare the items before they are handed over.

How many franking cartridges should I keep spare in December?

There is no fixed figure, as it depends on your volume and machine. A sensible rule is to keep at least one spare cartridge and review it against your busiest week, since December mail volumes are often higher.

Can I order franking supplies close to the last posting dates?

It is risky. Order supplies well before your internal cut-off so there is time for delivery and for a test print, rather than relying on a last-minute order.

Get your mailroom ready early

The key dates are simple: 18 December for 2nd Class, 21 December for 1st Class and 23 December for Special Delivery Guaranteed. Set your own deadlines a few days earlier, check your supplies in November and test your machine before the rush. When you are ready to restock, browse the full range of franking supplies at Franking Machine Warehouse.