Supplementary Amex or your partner’s own debit card: whose account the points land in, and whether they can be combined

If the second adult in your household puts their everyday spend on a supplementary Amex, every point they earn lands in the primary cardmember’s Membership Rewards account, and Amex says the primary can redeem all of it. If they put the same spend on a points-earning debit card in their own name, those points build a separate balance, and none of the Amex FAQ passages quoted here describes a way to bring them into Membership Rewards. Only the supplementary route is documented as counting towards a single Membership Rewards redemption.

The trade-off is control. Points from supplementary spend sit in the primary’s Membership Rewards account, and the FAQ gives redemption rights to the primary. Amex says partner transfers go only into an account in the transferring cardmember’s own name, and Points for Credit is applied to the Primary Card Account. Treat partner transfers as going only to accounts in the primary’s name unless Amex confirms that a supplementary cardholder or authorised third party can transfer into their own. The debit card can still be the better home for the spend, but only if its programme’s terms confirm three things. Its points must be able to reach the redemption you actually want. You need to know what getting them there costs. And its net earn after fees must beat what the same spend would add on the supplementary card.

Everything below about Amex comes from its UK Membership Rewards redemption FAQ, read on 3 November 2026. The page is undated, so recheck it before you move spend or points.

The article assumes the household has one Amex UK personal card account with Membership Rewards, not a Corporate Card, and that the second adult is, or could become, a supplementary cardholder on it. The redemption FAQ doesn’t cover supplementary earn rates or supplementary card fees, so check those on your own card’s terms. No specific debit card is assessed here, because the comparison depends on terms I haven’t reviewed for any product.

Supplementary spend lands in the primary’s account

Amex’s wording is direct: “The primary Cardmember can redeem all Points earned on their account, whether spend was made on their Card or on any supplementary Cards linked to the primary account.” (Amex UK). Any points your partner earns on eligible supplementary-card spend add to the same balance as your own. Which purchases earn depends on your card’s terms. For a household saving towards one big redemption, that is the main attraction.

It helps to separate operations that sound alike but follow different rules:

• Pooling inside one Membership Rewards account. This is what a supplementary card does, and Amex documents it.
• Moving points between two cardmembers’ Membership Rewards accounts. Amex rules this out: “it is not possible to transfer Points to another Cardmember’s Membership Rewards account” (Amex UK). If your partner holds their own Amex with its own Membership Rewards account, the two balances can’t be merged.
• Pooling inside a partner programme, such as an airline household account. This happens after points leave Amex, and that programme’s rules govern it entirely.

Once the points are pooled, the exit routes are narrow. Amex says Membership Rewards points “can only be transferred by you into an account in your name” (Amex UK). Unless Amex confirms otherwise, assume the household’s combined points can only go into the primary’s own frequent flyer or hotel account. Transfers to those partners are irreversible. Verifying a newly linked partner account can take up to 14 days. After that, a transfer usually completes within five working days, though this varies by partner (Amex UK).

Because transfers can’t be undone, the order of operations matters. Your partner might later earn points in the same partner programme through a debit card. If you hope to pool those with transferred Amex points, confirm that programme’s pooling rules before you transfer, because you can’t reroute the points afterwards.

What the second person can do with that balance

A supplementary cardholder generates the points, but on the FAQ’s wording the redemption rights sit with the primary. The FAQ documents one way to give the second person access: the primary can appoint them as an authorised third party, after which “the designated person will then have full access to the primary Cardmember’s Membership Rewards account, and will be able to request a Points balance and make redemptions” (Amex UK). The FAQ says this is done by form, though I haven’t seen the form itself.

Authorised third party status gives your partner access to the primary’s account. The points stay in the primary’s Membership Rewards account.

The FAQ leaves one practical gap. It doesn’t say whether “an account in your name” could include a supplementary cardholder or an authorised third party transferring into a partner account in their own name. Assume it means the primary’s name until Amex confirms otherwise.

The other question is who can travel. Amex says some travel partners “may allow 3rd parties to travel using Points from the primary Cardmember’s account, but this varies by partner”, and tells cardmembers to check with the partner before redeeming (Amex UK). I haven’t reviewed BA Club’s rules on booking rewards for other people. Pooling everything into one balance doesn’t settle whether one booking can cover two travellers, so check the specific partner first.

Points for Credit is applied to the Primary Card Account

Some households will redeem points against the card bill rather than book a flight. Amex says points “may be redeemed by the Cardmember for a credit on the Primary Card Account” (Amex UK). The same page sets these conditions:

• Amex processes the credit within 3 business days, and it cannot be reversed.
• It isn’t available on Corporate Card accounts.
• It can’t be taken as cash through a credit balance refund.

The FAQ also poses the question of which card receives the credit when several cards are linked to one Membership Rewards account. The answer wasn’t in the text I retrieved, so I won’t guess; ask Amex if it matters to you.

This has a direct bearing on the debit card comparison. Points earned on a debit card can’t be redeemed through Membership Rewards Points for Credit. If Points for Credit is your household’s realistic redemption, moving your partner’s spend to a debit card takes that spend out of this route, and what it returns instead depends on the debit card programme’s own redemption options.

A debit card in the partner’s name is a separate balance

Points from a debit card in your partner’s name sit in their name, in whatever programme the card pays into. None of the Amex FAQ passages quoted here describes a way for those points to enter Membership Rewards, and Amex blocks moves between two Membership Rewards accounts as well. Any combining therefore has to happen inside the debit card’s programme, through one of these routes:

• household pooling, where several members’ balances are combined
• member-to-member transfer, where your partner moves points into your account
• your partner booking a reward for you as a named traveller

None of these is documented in the sources behind this article. Treat each one as a question for the programme, not a feature you can assume.

The split matters less if your partner will redeem on their own, for example on their own reward seat or hotel stay. The comparison then comes down to earn against earn.

Avios is one conditional case. If a debit card earned Avios into your partner’s own BA Club account, BA’s factsheet says Avios don’t expire as long as members collect, use or purchase at least one Avios every 36 months. It also says members who have collected any Avios in the past 12 months can use Reward Flight Saver on flights within Europe (British Airways). Steady everyday earning would meet both conditions, but only if the card really earns Avios into your partner’s account. The factsheet is also undated, so check BA’s current terms.

A worked scenario with hypothetical figures

Every number here is invented to show the arithmetic. None is a quoted earn rate, price or redemption cost.

• The household wants one redemption costing 60,000 Membership Rewards points.
• The primary’s own spend will produce 45,000 points over the year.
• The partner spends £15,000 a year on everyday purchases.
• On the supplementary card, the partner’s spend is assumed to earn 1 point per £1. Check your card’s actual supplementary earn.
• The debit card earns D points per £1 in its own programme, after exclusions.

Route for partner’s spend	Membership Rewards balance	Gap to 60,000	Partner’s own balance
Supplementary Amex	60,000	None	None
Partner’s debit card	45,000	15,000	15,000 × D in another programme

On the debit card route, Amex’s only documented way to top up is buying points: “You can purchase extra Points up to a maximum of 10,000 per year” (Amex UK). The FAQ says the price is given on contact, and Amex may change the purchase limits. In this scenario, buying the maximum still leaves the household 5,000 points short, and the partner’s debit card balance can’t help unless the redemption can be booked in that card’s programme.

To generalise, call the shortfall without the partner’s spend S. Buying points and supplementary earn can be combined. If S is above 10,000, the household reaches the target within a year only if the partner’s supplementary earn covers at least S minus 10,000 with a maximum purchase, or all of S without one. If S is 10,000 or less, buying points can close it on its own. In that case, get Amex’s price and weigh it against what the debit card would net your partner on the same spend. Count the debit card points as worth nothing in that comparison unless they have a redemption your partner would actually use (step 1 below).

What the debit card’s terms must confirm

Check the Amex side first. The redemption FAQ doesn’t state supplementary earn rates or fees, so confirm both on your card’s terms. If the supplementary card carries a fee, or earns less than you assumed, the bar the debit card has to clear is lower.

1. Can its points reach the redemption you want? Look for household pooling, member-to-member transfer, or booking a reward for another named traveller. If one of these applies, go to step 2. If none applies, your partner’s points can’t join your booking. If your partner will redeem them on their own, skip to step 3. If not, the debit card points would sit unused even if bought Membership Rewards points close your shortfall, so the debit card route fails here, whatever its earn rate.
2. What does combining cost? Look for transfer or pooling fees, minimums and maximums, lock-in periods, and any rule on how points are deducted from each member when a pooled reward is booked.
3. What is the net earn after fees? Check the monthly or annual fee and which spend is excluded, such as bills, tax payments or cash-like transactions. Find out whether earning stops, or points lapse, if the card or account is closed.
4. Does that beat the supplementary card? Compare the debit card’s net earn on your partner’s actual eligible spend with what the same spend adds to the Membership Rewards balance, less any supplementary fee. If moving the spend leaves a shortfall you would close by buying Membership Rewards points, add Amex’s quoted price for those points to the cost of the debit card route.

Step 1 outweighs the rest. A better earn rate doesn’t help if the points can never join the booking you’re saving for.

What Amex’s FAQ doesn’t settle

Put these questions to Amex and to the partner programmes rather than answering them by assumption:

• For Amex: what does a supplementary card earn on your specific card, and is there a fee?
• For Amex: can a supplementary cardholder or authorised third party transfer points into a partner account in their own name?
• For Amex: on an account with multiple cards, which card receives a Points for Credit redemption?
• For Amex: what is the current price of purchased points, and is the 10,000 annual cap unchanged?
• For the airline or hotel partner: can the primary book a reward for the second person, and does the programme allow household pooling or member-to-member transfers?
• For the debit card provider: all of the checklist items above, in writing.

For a single shared redemption, the supplementary card is the route Amex documents as working. Points from your partner’s eligible spend count towards the same balance, but the primary controls their redemption. A debit card in your partner’s name can still win, but only once its terms show that its points can reach your redemption, what that costs, and that the net earn after fees beats the supplementary card. If you’re tempted to move pooled points out early, the case against speculative transfers applies here too. Rules quoted are as read on 3 November 2026.