Most businesses choose a franking machine for the postage savings, then quietly forget about the one cost that actually keeps it running: ink and labels. Get those consumables right and they barely register. Get them wrong - buying the most expensive original cartridge out of habit, or running dry mid-batch - and you chip away at the very savings the machine was meant to deliver.
So what should franking ink and labels really cost a UK business in 2026, and how do you keep that bill as low as possible without risking your mail? Here is a clear, honest breakdown.
How Much Does Franking Machine Ink Cost in 2026?
The short answer: franking machine ink is sold as a sealed cartridge specific to your machine model, and a compatible (non-branded) cartridge typically costs a fraction of the original equivalent - often saving up to around 80% per cartridge while printing the same Royal Mail compliant frank.
There is no single universal price, because cartridge cost depends entirely on your machine. A small desktop franking machine uses a smaller, cheaper cartridge than a high-volume mailroom system. What matters far more than the headline price is the cost per franked item, which is driven by the cartridge yield (how many impressions it prints) rather than the sticker price alone.
The practical rule is simple: match the cartridge to your exact model, then choose between original and compatible. You can find the right consumable fast by browsing the supplies for your brand - for example Quadient inks and labels, Neopost inks and labels or Frama inks and labels.
Original vs Compatible Franking Ink: Is Compatible Ink Safe to Use?
This is the question that saves businesses the most money, so it is worth answering plainly.
Yes - compatible franking ink is safe to use, provided it is Royal Mail approved. Royal Mail requires that the frank it scans is legible and printed to the correct specification so its automated equipment can read the Mailmark barcode. A reputable compatible cartridge is manufactured to meet exactly that standard. Franking Machine Warehouse is one of only a small number of UK suppliers whose ink is Royal Mail approved, which means a compatible cartridge prints a frank that passes through the network identically to an original.
The difference is purely price. Original (manufacturer-branded) cartridges carry a premium for the name on the box. Compatibles deliver the same compliant print for substantially less - which is why, for most businesses, compatible ink is the sensible default and original is reserved for those who prefer to stay strictly manufacturer-branded.
A quick word of caution: "safe" depends on quality. Bargain-bin ink of unknown origin can underfill, dry out, or print a frank Royal Mail's scanners reject - which can cost you far more in returned or surcharged mail than you saved. Buying Royal Mail approved compatibles from an authorised franking supplier removes that risk entirely.
What About Franking Labels - When Do You Need Them?
Franking labels (self-adhesive franking strips) are used when you cannot run an item through the machine directly - typically parcels, large or thick packets, and anything too rigid to feed. Instead of franking the envelope, you print the postage onto a label and apply it.
For everyday letter and large-letter post, you frank directly onto the envelope and use no labels at all, so labels are only a running cost if you send parcels or oversized items. Like ink, labels come in machine-specific formats and are available in compatible versions that match the original specification at a lower price. You will usually find labels listed alongside the ink in each brand's supplies collection, such as the FP Mailing Postbase supplies range.
How Long Does a Franking Ink Cartridge Last?
Cartridge life is quoted as a number of impressions (franks), and it varies widely by machine - from a few hundred impressions on a small desktop unit to many thousands on a mailroom system. Two things affect how fast you get through ink.
Your volume is the obvious one - more mail means more frequent cartridge changes. The less obvious factor is what you print. Many machines let you add an advert or return address to the frank; printing a large graphic on every item uses noticeably more ink than a plain postal impression. If you are trying to stretch a cartridge, keeping the frank clean and text-light helps.
A good habit is to keep one spare cartridge on the shelf. Franking ink can dry if a machine sits unused for long periods, and running dry mid-batch stalls your post - a spare costs little and saves a scramble.
How Do Running Costs Compare to the Postage Savings?
This is the part that puts ink and labels in perspective. The reason a franking machine pays for itself is the gap between stamp prices and franked (Mailmark) prices - and that gap dwarfs the cost of consumables.
Using the verified Royal Mail rates effective 7th April 2026:
A first class letter costs £1.80 as a stamp but £1.77 with Mailmark franking. A second class letter costs £0.91 as a stamp versus £0.88 franked. The biggest like-for-like saving is on a first class large letter (0-100g), which costs £3.30 as a stamp but just £2.86 with Mailmark - a saving of up to 13.33% on every single item.
Set that against ink: even a few pence of ink per item is comfortably outweighed by a saving of up to 44p on a single large letter. In other words, consumables are a small operating cost, not the thing that decides whether franking is worth it. If you want the full picture on that decision, see our guide on whether a franking machine is worth it in 2026, and to make sure you are on the right service, our breakdown of first class vs second class franking.
How to Keep Your Franking Running Costs Low
A few simple choices keep your consumables bill at its minimum. Choose Royal Mail approved compatible cartridges over originals wherever you are comfortable doing so - this is the single biggest saving. Buy the correct cartridge for your exact model so you are not paying for capacity you do not need or replacing it too often. Keep your franks clean and text-light to stretch each cartridge further. Keep a spare on hand so a dried or empty cartridge never stops your post. And make sure your machine is on Mailmark, so every frank you print is already at the lowest available postage rate.
If you are not sure which cartridge or label fits your machine, the simplest route is to browse all franking supplies or get in touch with your machine model to hand.
Frequently Asked Questions
Is compatible franking ink approved by Royal Mail?
Yes - reputable compatible cartridges are manufactured to Royal Mail's print specification, and Franking Machine Warehouse is one of only a few UK suppliers with Royal Mail approved ink. The frank prints to the correct specification so it scans identically to an original cartridge.
Will using compatible ink void my franking machine warranty?
No. Using a quality compatible cartridge does not affect your Royal Mail account or your machine's ability to frank. Always buy from an authorised, Royal Mail approved supplier to be sure the ink meets specification.
How much can I save with compatible cartridges?
Compatible cartridges typically cost far less than originals - often a saving of up to around 80% per cartridge - while printing the same compliant frank. The exact figure depends on your machine model.
Do I need franking labels?
Only for items you cannot feed through the machine, such as parcels and oversized packets. For ordinary letters and large letters you frank the envelope directly and use no labels.
How often will I need to replace the ink?
It depends on your mail volume and your machine's cartridge yield, which is measured in impressions. Higher-volume mailroom machines use larger cartridges that last many thousands of franks; small desktop machines use smaller cartridges. Keeping a spare avoids any interruption.
Where can I buy the right ink and labels for my machine?
Browse the supplies collection for your brand - Quadient, Neopost or Frama - or contact the team with your model number for a recommendation.
Franking ink and labels are the running cost businesses notice least and overpay on most. Match the cartridge to your machine, choose Royal Mail approved compatibles, and keep a spare on the shelf - and your consumables become a rounding error against the postage you save on every item.