---
title: "How does LUSID calculate cross gain/loss?"
slug: "how-does-lusid-calculate-cross-gain-loss"
updated: 2026-05-15T08:11:08Z
published: 2026-05-15T08:11:08Z
canonical: "support.lusid.com/how-does-lusid-calculate-cross-gain-loss"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://support.lusid.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How does LUSID calculate cross gain/loss?

Cross gain/loss is defined as FX gain/loss on market gain/loss. LUSID can calculate cross gain/loss but does not currently report it fully.

Consider the following example, of a single unit of a USD stock in a GBP portfolio that is valued on the purchase date:

![](https://cdn.document360.io/d575ad81-c0ed-4980-bbd1-d59ac5c3de82/Images/Documentation/image-WQQMCJ8V.png)

Imagine we subsequently value this holding after a change in the market price (from $70 to $88) and the USD/GBP rate (from 0.8 to 0.85):

![](https://cdn.document360.io/d575ad81-c0ed-4980-bbd1-d59ac5c3de82/Images/Documentation/image-JP6UYHHC.png)

|  | Metric | Calculation |
| --- | --- | --- |
| Base cost |  | `Holding/Cost/Pfolio` | Purchase FX rate * Purchase price | ![](https://cdn.document360.io/d575ad81-c0ed-4980-bbd1-d59ac5c3de82/Images/Documentation/CrossGain1.png) |
| Base PV |  | `Valuation/PvInPortfolioCcy` | Current FX rate * Current price | ![](https://cdn.document360.io/d575ad81-c0ed-4980-bbd1-d59ac5c3de82/Images/Documentation/CrossGain2.png) |
| Base P&L | Total | `ProfitAndLoss/Total/PortfolioCcy` | Base PV - Base cost | ![](https://cdn.document360.io/d575ad81-c0ed-4980-bbd1-d59ac5c3de82/Images/Documentation/CrossGain3.png) |
| Market | `ProfitAndLoss/Total/Market/PortfolioCcy` |  | ![](https://cdn.document360.io/d575ad81-c0ed-4980-bbd1-d59ac5c3de82/Images/Documentation/CrossGain4.png) |
| FX | `ProfitAndLoss/Total/Fx/PortfolioCcy` |  |

However, the market P&L actually consists of two components: market gain, and FX gain on that market gain. It is not currently possible to report this separately in a valuation.

It *is* possible to examine this separately in journal entry lines if the portfolio is [managed by a fund](/v1/docs/financial-reporting-abor):

![](https://cdn.document360.io/d575ad81-c0ed-4980-bbd1-d59ac5c3de82/Images/Documentation/image-LQ9VI4L5.png)

Here, the market gain of £15.30 is broken down into:

- Core market gain: £14.40
- FX gain on the market gain: £0.90 (highlighted in yellow, and reported as both a credit and debit per the double-entry system):

![](https://cdn.document360.io/d575ad81-c0ed-4980-bbd1-d59ac5c3de82/Images/Documentation/CrossGain5 (1).png)