If HMRC ever wanted to inspect your books you will need to show dividend payments as separate from salary and reimbursed expenses. If you pay the whole lot as one lump payment, they may argue the whole amount is salary and seek to apply PAYE and NIC to the full amount. It is acceptable to lump your salary and reimbursed expenses together, however paying your salary, reimbursed expenses and dividends as three separate transactions will also assist in reconciling your bank accounts.
