# Tag Formulas

- [Global tags](/portant-docs/personalise-documents/tag-formulas/global-tags.md): These are tags that can be used in any document
- [Tag Formulas](/portant-docs/personalise-documents/tag-formulas/tag-formulas.md): Sometimes you might need to calculate values within your document template. Within Portant you can add calculations directly within tags simply by include = at the beginning of the tag.
- [Tag IF Statements](/portant-docs/personalise-documents/tag-formulas/tag-if-statements.md)