Billable expenses are costs you're charged as part of a job that you want to recover from your customer. You might also refer to billable expenses as oncharging, onbilling, recharging, reimbursables, or pass on costs.
How billable expenses work in Xero
Assign items as billable to a customer
Add a one-off bill or spend money transaction in Xero and assign the customer's name to the expenses that you want to recover.
You can't assign expenses on repeating bills.
Xero prompts you to charge back expenses to your customer
When invoicing that customer in the future, you have the option to add the expenses to their sales invoice.