Ramp or Brex for a Field Service and Repair Business

A technician standing at a supply counter with a customer's equipment down doesn't have time to wait for an approval workflow. The platform that wins here is whichever one lets a technician's card clear a purchase at an unfamiliar local vendor without a manual hold, while still flagging it for review afterward. Test this specific scenario with both platforms, not the general onboarding flow, since it's the moment that actually matters for this business.

Ramp allows broader merchant categories for field cards than a tightly locked fuel card, which fits a technician who might buy parts, small tools, or even a rental piece of equipment depending on the job. If your technicians are mostly buying from a rotating set of local supply houses rather than a fixed vendor list, Ramp's flexibility matters more than tight category locking would.

Brex tends to fit better once a repair business is also stocking warranty parts inventory or occasionally buying a replacement unit outright rather than just repairing one, since those purchases run larger than a typical field parts buy and benefit from higher limits without a manual override each time. If warranty reimbursement timing matters to your cash position, Brex's cash management account also gives visibility into what's tied up waiting on a manufacturer to pay you back.

If your technicians cover a wide territory and occasionally need a hotel stay for a multi-day job or an overnight emergency call, Navan folds that travel booking into the same card program as parts spend. That's a narrow benefit if your service radius is small enough that technicians go home every night, so weigh it against your actual dispatch geography, not a general assumption about field service work.

The temptation is to set tight per-transaction limits to control spend, but a limit set too low means a technician gets declined mid-repair on a legitimate emergency parts buy, which costs you more in customer trust than the spend control saves. Set limits based on your actual historical parts-buy data, not a round number that feels safe, and review declines weekly to catch a limit that's too tight before it costs you a customer relationship.

Use these checks when you set technician limits:

• Base each limit on the technician's historical emergency parts buys, not on a round number that merely feels safe to the office.
• Let a technician's card clear a purchase at an unfamiliar local vendor, then flag it for review afterward instead of holding it at the counter.
• Review declines every week, since a legitimate emergency buy that gets blocked costs more in customer trust than the spend control saves.
• Require a receipt photo and a short job note at the time of purchase, so review never depends on anyone's memory weeks later.

A repair business selling recurring maintenance contracts alongside one-off emergency calls needs to code technician spend differently for each. Parts bought under a maintenance contract are already priced into what the customer pays monthly or annually, so that spend should track against the contract's margin rather than get billed back to the customer separately. An emergency repair's parts spend, by contrast, usually gets marked up and billed directly, so it needs to stay visible and trackable, not buried in the same card category as contract work.

Mixing the two makes it impossible to tell whether your maintenance contracts are actually profitable or being subsidized by emergency-call margin, which is exactly the number you need before renewing contract pricing for the next year.

Set this up as two card categories or two cost codes from the first contract you sell, not after a customer complains their bill looks off. A technician working a contract call should default to the contract code unless they flag the job as out-of-scope, and that flag should trigger the markup and separate billing automatically rather than relying on the technician to remember which pricing rule applies to which visit.

Review contract margins quarterly using the separated cost codes, comparing parts spend under contract against what those same customers paid the prior year for one-off calls before they signed. A contract priced too low relative to actual parts usage is a problem you want to catch at renewal, not two years into a multi-year agreement you can't easily reprice. A five-minute quarterly review beats an unpleasant surprise at renewal time.