Only received expenses - declare to HMRC?

Cat2011

I fill in a self-assessment tax return.
I did a month's work as a favour to a non-UK organisation. They paid my expenses in dollars (equivalent to ~£4,000), but didn't pay me a salary. Do I need to record this on the SA? If so, how?

TheCyclingProgrammer

I would treat it as a one off piece of additional income and include the amount in box 17 of the main return. If you incurred any allowable expenses you should include this amount in box 18.

If in effect you've only been paid to cover your expenses and all of those expenses are tax deductible then the two should cancel each other out and no tax should be due, but it depends what expenses the payment covered.