The 2026 pricing grid of La Poste is based on three distinct mail products, each associated with a different delivery time and service level. The green letter (J+3) remains the foundation of domestic postage at €1.52 for a 20 g letter. The Services Plus letter (formerly turquoise, J+2) is priced at €3.47, and the red e-letter (J+1, digital send) at €1.60. Understanding the gap between these three pricing lines is crucial for any postal optimization strategy.
Online stamp vs physical stamp: the price gap that changes the game
We observe a systematic differential between the stamp purchased at the post office and the one generated via Mon Timbre en Ligne. For the 20 g green letter, the online stamp costs €1.49 compared to €1.52 for the physical stamp. Three cents per item may seem negligible individually, but over a flow of several hundred monthly shipments, the savings add up quickly.
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This differential is explained by the elimination of the physical distribution cost of the stamp (printing, logistics, sales point commission). La Poste passes part of this saving on to the final price. For organizations managing regular volumes (firms, local authorities, associations), switching to home printing represents an immediate optimization lever.
Any in-depth analysis on the cost of mail postage in France confirms that this price difference also applies to higher weight brackets, not just the 20 g tier.
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Limited validity of online stamps starting September 2026
As of September 16, 2026, stamps purchased via Mon Timbre en Ligne will no longer be valid indefinitely. Their validity is now limited to six months after the purchase date. This regulatory change radically alters the management of printable stamp stocks.
Until now, an online stamp purchased in January could be used in December without restriction. This is no longer the case. Regular shippers must now calibrate their purchases based on their projected volumes for six months, or risk losing the face value of unused stamps.
This constraint does not apply to physical self-adhesive stamps, which remain usable without a time limit as long as their face value covers the required postage. We recommend that organizations with variable flows maintain a buffer stock of physical stamps to absorb unexpected peaks and reserve online stamps for planned shipments.
Trade-off between discount and expiration risk
The combination of discount/expiration creates a new trade-off. A massive purchase of online stamps generates a unit saving but exposes one to a loss if the actual volume falls short of forecasts. Conversely, purchasing gradually reduces the risk of expiration but prevents benefiting from potential bulk discounts on digital booklets.
For businesses sending several hundred letters per month, the best practice is to break purchases into quarterly batches aligned with shipping forecasts, with a safety margin of about one month.
Weight tiers and postage: the thresholds to know
The pricing grid for the green letter operates by weight tiers. Each crossing of a threshold triggers a significant additional cost. The applicable tiers for 2026 are as follows:
- Up to 20 g: €1.52 (physical stamp) or €1.49 (online stamp). This is the base rate for a standard letter, typically one to three folded A4 sheets.
- From 20 g to 100 g: the rate increases significantly. This tier covers the majority of administrative mail (contracts, multi-page forms, small bound documents).
- Beyond 100 g and up to 250 g: the additional cost is proportionally higher. At this stage, we recommend checking if a tracked letter or Colissimo shipment would be more relevant in terms of cost/service ratio.
Weighing each item before postage avoids returns for insufficient postage. An envelope C5 with four A4 sheets and a plastic sleeve often exceeds 20 g. A precision scale (to the gram) is a minimal investment that eliminates this risk.
Announced price increase for 2027: anticipate now
La Poste announced on July 27, 2026, an average increase of 6.73% across the entire universal postal service starting January 1, 2027. The 20 g green letter will rise from €1.52 to €1.67, the Services Plus letter from €3.47 to €3.67, and the red e-letter from €1.60 to €1.70.
This increase is part of the multi-year pricing framework established by Arcep, aimed at compensating for the continuous decline in mail volumes while maintaining the quality of universal service (one collection and one delivery six days a week across the entire territory).
What the 2027 increase means for postal budgets
For the green letter, the increase from €1.52 to €1.67 represents a rise of 15 cents per item. For an organization sending a thousand green letters per month, the annual bill increases significantly. Organizations that still have uncommitted budgets in 2026 should consider building a stock of physical stamps at the current rate, as these remain valid indefinitely.
Online stamps, however, do not allow for this anticipatory stockpiling strategy due to the new six-month validity rule. Only physical stamps allow for locking in the 2026 rate for future use.
The gap between the two purchasing channels will therefore widen in terms of strategy: the online stamp remains relevant for the reduced unit price and the convenience of printing, while the physical stamp becomes a tool for price coverage against announced increases. Adapting purchasing policies to this dual logic allows for budgetary control without sacrificing operational responsiveness.