Expansion
As the system allows for a maximum of ten million numbers to be issued, and with numbers having been issued to both the Irish and the legal immigrant population, expatriates, and many people who are now deceased, the current system will be in need of expansion in the not distant future.
From January 2013, the format will use a letter after the current check character. This has the advantage that all current PPS numbers remain valid. The letter after the check character would have a weighting of nine. The letter value would be assigned the same as the check character's. A=1, B=2 ... W=0.
Examples of valid new PPSN
1234567T
1234567TW
1234567FA
Read more about this topic: Personal Public Service Number
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