Renovations, tax bills, a major business expense — big one-off purchases are usually just painful. But if you're going to spend five figures anyway, the card you put it on can mean the difference between a flat 1% back and a free flight, hotel elite status, or a companion ticket.

The first move, according to One Mile at a Time, is obvious once you think about it: if you've been eyeing a new card with a hefty welcome bonus and a large minimum spend, a big purchase is the perfect way to clear it in one go. That's typically the highest return per dollar you'll get from any single transaction.

If no new card makes sense, the fallback is a strong everyday earner. Travel-focused options like the Bilt Palladium, Capital One Venture and Venture X, and Citi Double Cash earn roughly 2x transferable points per dollar — valued at around 3.4%. On the business side, the Amex Business Platinum pays 2x on purchases of $5K or more, and the Ink Business Premier gives 2.5% cash back on $5K-plus purchases. Bank of America's Premium Rewards card is a sleeper for its wealthy customers: with $1 million deposited at the bank, you earn 2.625% back on everything.

The more interesting play for travellers is using big spend to unlock status and perks. Alaska's Atmos Rewards lets you earn elite status purely through card spending — $250K on the Summit Visa Infinite gets you Titanium plus a 100K-point global companion award at $60K of annual spend. American's Loyalty Points and Delta's Medallion Qualifying Dollars systems work the same way, up to Executive Platinum and Diamond Medallion respectively, as does United's PQP route to Premier 1K. Southwest fans can chase the Companion Pass, where a companion flies for just taxes and fees.

Hotel cards are arguably even juicier. The IHG Premier Select grants Diamond status at $25K of annual spend; Hilton's Surpass does it at $40K. And the spending sweet spots are hard to beat: $15K a year on the World of Hyatt card or the Hilton Surpass each earns a free night award — essentially a guaranteed free hotel stay for spending you'd do anyway.

A few other angles worth weighing. If you actually need to spread out the cost, a 0% intro APR card beats chasing rewards — just have a payoff plan before the promotional period ends. And don't forget purchase protection and extended warranty coverage, which matter most on premium cards if you're buying electronics.

Who is this for? Anyone facing a large non-bonused expense — taxes, tuition, renovations, a big business buy — who'd rather extract flights and hotel nights than pocket an extra percent of cash back. The catch: you'll need a high enough credit limit, which is where charge cards can help. There's no single best card; the smart approach is matching the purchase to whichever goal you value most — a welcome bonus, everyday points, elite status, or a free night.