How to limit an amount to 2 decimals?

Please can you tell me how to stop user entering more than 2 decimal places in my spend field ?

https://form.jotformeu.com/82024015917349

You may use the Masked Input widget to achieve it, you will only need to configure the widget to have 2 decimal places: 

You will find the widget here: https://widgets.jotform.com/widget/masked_input 

This guide will help you adding the widget to your form: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-Your-Form 

An example can be seen here: https://form.jotform.com/60276535070957

I hope this helps. 

Thanks. I have found that widget to be a bit flaky on some browsers.

I found the Currency validation in the short text field . This looks to do the best job ?

The Currency validation option should work.

Example:

Let us know if you need further assistance.