I assume you’re a *charity* treasurer?
This is fraught. NCVO says you can’t pay a per diem, must be real expenditure reimbursed.
link removed.
I haven’t found any HMRC guidance that confirms that in terms, but their line on mileage allowances suggests strongly that would be their view.
Where did you get the £10 rate from? Afaik that is only available for subsistence when travelling overnight, overseas; the UK rate is £5, again only overnight.
Assuming all above is accurate, if not too many drivers I’d look at an Equals Money payment card, preload it, and ask vols to keep receipts.
But charity accountant may have better ideas. Try CharityTaxGroup.
@Scalloway often good on this sort of thing, too.
Or see if you can get a bespoke agreement with HMRC? if that ever works for folk with a balance sheet counted in 1000s, hahaha. (But in all seriousness, HMRC Charities usually very helpful ime)