Start with the statements, not the offers
Export or print three months of transactions and sort them into broad buckets: groceries, dining, fuel and transport, bills and subscriptions, retail, travel. Do not estimate. The exercise takes twenty minutes and almost always produces at least one surprise.
Find your top two categories
Add up each bucket and rank them. For most households two categories account for a large share of discretionary spending. Those two are the only ones worth optimising for. Everything below them should be handled by a flat rate and forgotten about.
Watch for caps and definitions
An elevated rate that stops after a spending threshold is really an ordinary rate for the rest of the year. Equally, category definitions can be narrower than the label suggests — a warehouse club or a supermarket inside another store may not be classified the way you assume.
An elevated rate on a category you barely touch is worth less than an ordinary rate on the one where your money actually goes.
Recheck after any life change
A new job, a move, a baby or giving up a car can flip your category ranking entirely. Redo the twenty-minute exercise whenever something structural changes rather than waiting for renewal season.
Keep the rest boring
Once your top two are covered, resist optimising further. The marginal gain from a third specialised card is small and the added complexity is not. A simple setup you follow beats a clever one you abandon.
