The Queen will send a congratulatory message on the following occasions:
Wedding anniversaries
The Queen sends messages for Diamond (sixtieth), sixty-fifth and Platinum (seventieth) wedding anniversaries and then every year thereafter.
Her Majesty does not send a message for Silver (twenty-fifth), Ruby (fortieth) or Golden (fiftieth) wedding anniversaries.
Birthdays
The Queen sends messages for one hundredth and one hundred and fifth birthdays and then every year thereafter.
Countries entitled to receive a message
It is Her Majesty's custom to send a message only to citizens of her realms or UK Overseas Territories as follows:
| Realms | UK Overseas Territories | |
| Antigua and Barbuda | Anguilla | |
| Australia | Bermuda | |
| Bahamas | British Antarctic Territory | |
| Barbados | British Indian Ocean Territory | |
| Belize | British Virgin Islands | |
| Canada | Cayman Islands | |
| Grenada | Falkland Islands | |
| Jamaica | Gibraltar | |
| New Zealand | Montserrat | |
| Papua New Guinea | Pitcairn Group of Islands | |
| Solomon Islands | St. Helena and its dependencies | |
| St. Christopher and Nevis | South Georgia and the South Sandwich Islands | |
| St. Lucia | Sovereign Base Areas of Cyprus (air bases) | |
| St. Vincent and the Grenadines | Turks and Caicos Islands | |
| Tuvalu | ||
| United Kingdom of Great Britain and Northern Ireland |
