Every tracker needs a sundries drawer, and this is it — genuine business costs that don't fit a more specific category. The trick is to use it sparingly: your quarterly totals are compared across businesses, and a huge catch-all number is the kind of thing that attracts attention.
The dumping-ground problem is real. When "other" is your biggest category, either the specific categories are being ignored or personal costs are creeping in. The rule is simple: if a cost has an obvious home — mileage, software, phone — it goes there, and this category stays small and honest.
Personal costs in disguise are the second issue. Work-adjacent spending like ordinary clothes, wellness apps or a "business" streaming subscription is not claimable, and a note saying "business use" doesn't make it so.
Training confuses everyone. The dividing line is updating versus retraining: keeping your current skills current is deductible; learning a whole new trade is not, even if you intend to add it to the business later.
Select Other operating expenses only when nothing else fits, and always write a note describing what the item actually was. A tidy "other" category with clear notes is far more convincing at year end than a big number with no explanation.
Track all your expenses in HMRC's own categories with the MTD Sole Trader Tracker.
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