> For the complete documentation index, see [llms.txt](https://www.bluegamma.io/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.bluegamma.io/documentation/integrations/excel-add-in/functions/get-bond-yield.md).

# Get Bond Yield

Get the indicative bond yield-to-maturity for an ISIN.

{% hint style="info" %}
**New to the Excel Add-In?** [Install the add-in](/documentation/integrations/excel-add-in/installation-and-setup.md) to start using this formula.
{% endhint %}

**Formula**

```
=BlueGamma.BOND_YIELD(isin, [valuation_date])
```

**Parameters**

| Parameter        | Type                | Description                                                                                                                                          |
| ---------------- | ------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
| `isin`           | string              | 12-character ISIN of the bond (e.g. `XS1234567890`)                                                                                                  |
| `valuation_date` | string *(optional)* | Valuation date or datetime (UTC), e.g. `2026-07-17` or `2026-07-17T14:30:00`. Date-only values price at end of day (23:59:59 UTC). Defaults to live. |

**Returns**

Bond yield-to-maturity as a decimal (e.g. `0.0412` for 4.12%).

**Example**

```excel-formula
=BlueGamma.BOND_YIELD("XS1234567890")
```

```excel-formula
=BlueGamma.BOND_YIELD("XS1234567890", "2024-06-30")
```

### Notes

* The yield is sourced from indicative pricing and is not a live market quote.
* If `valuation_date` is omitted, the function returns the latest available yield.
* For historical lookups, the function returns the most recent yield on or before the valuation date.


---

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