Short answer
You need to inform official bodies like HM Revenue and Customs, your bank, your employer and your pension provider, especially if you change your name. You should also tell your local council for council tax and your GP. Your marriage certificate is the proof you will need for most of these.
The most important people to inform are the official organisations that hold your personal details. If you change your name, your bank, building society and credit card companies need to know. Your employer and your pension provider also need updating, so your payslips and pension records match your new name. HM Revenue and Customs should be told too, because your tax code and National Insurance record may be affected.
You should also tell your local council, especially for council tax. If you live alone or with someone, your single person discount may change after you marry. Your GP surgery and any other healthcare providers need your new name and marital status. If you hold a driving licence or passport, you will need to update those separately, and the rules for each can vary, so check the relevant government guidance.
Beyond official bodies, you will want to tell your family and close friends, but that is a personal choice. You might also want to inform your landlord or mortgage provider, your insurance companies for home, car or travel, and any subscription services or utilities in your name. Keep a checklist and work through it over a few weeks, rather than trying to do it all in one day.
If you are not changing your name, you may still need to tell some organisations about your change in marital status, such as your employer for tax purposes. The rules can vary, so check with each organisation directly.
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