RSVP. Four letters, one obligation, and a surprising amount of quiet resentment between couples and their least-organised friends every single wedding season. The rules aren't complicated — they're just unwritten in most families, which means everyone improvises and then privately judges each other's improvising.
Here's how modern UK wedding RSVPs actually work in 2026, from both sides of the envelope.
For couples: when to send invitations
Save-the-dates go out 6–9 months before the wedding, especially if it's a weekend that collides with bank holidays, summer holidays, or a half-term. You're asking people to block a day — the more notice, the more of them can clear their diary for you.
Formal invitations follow 8–12 weeks before the day. Sooner feels premature; later leaves guests with too little time to arrange flights, accommodation, or childcare.
Your RSVP-by date should land roughly 4 weeks before the wedding. That gives your caterer enough lead-time for final numbers, and you enough breathing room to chase the stragglers. Don't set it too early — guests treat RSVP deadlines like tax returns.
For guests: reply within two weeks
The moment an invitation lands, open it. Put the date in your calendar. Check it with whoever you'd bring. Reply.
Two weeks is the unspoken limit. Sitting on an RSVP for a month is genuinely unhelpful — the couple is trying to estimate a headcount for a venue, a caterer, and often a florist who needs to know how many table centrepieces to build. You delaying is not neutral; it's pushing your small decision onto their larger one.
How to reply, properly
If the couple has a wedding website with an RSVP form, use it. It's the option they've set up because it pipes your response straight into their guest list, meal choices, and dietary tracker — no manual re-entry.
If the invitation has a paper reply card, fill it in on the same day the invitation arrived. Post it within 48 hours. Do not put it on the fridge.
Whichever method, be clear. 'Yes, two of us, one halal meal, one vegetarian' beats 'we'd love to come!' by a mile. The couple is not interested in your enthusiasm; they're interested in what to tell the caterer.
Plus-ones: ask, don't assume
If your invitation is addressed to you alone, it's for you alone. The couple has decided — likely for budget or space reasons — that they can't extend plus-ones to everyone, and quietly bringing your new partner is not the workaround you think it is.
If you'd genuinely like to bring someone and weren't invited with a plus-one, ask. A short message to the couple explaining the situation ('I've just started seeing someone and would love to bring them — is that possible, or should I come alone?') gives them the dignity of saying no without the ambush of you turning up with a stranger.
For couples: chasing late RSVPs
When the deadline passes and you have ten 'no-response' guests, don't guilt-text the group chat. Reach out individually, warmly, and briefly. The message that works: 'Hi! Just checking — we need to give final numbers to the caterer on Friday. Are you and [partner] able to make it on the 15th? Totally fine either way.'
A wedding website that sends a single polite automated chaser on day 28 takes the awkwardness off your plate entirely — and most guests appreciate the nudge more than they'll admit.
After you've replied: changes
Plans change. If yours do, tell the couple the moment you know — not the week of. Catering and venue commitments are usually locked a week or two before the wedding, and late changes can cost the couple the per-head fee whether or not you come.
Pulling out last-minute is sometimes unavoidable. Pulling out last-minute and not telling anyone is unforgivable.
The one rule that covers all of it
A wedding RSVP is a small act of respect. The couple has asked for a decision, on a deadline, so that they can plan the biggest day of their year. Meeting that ask — promptly, clearly, and unambiguously — is the entirety of the etiquette. Everything else is footnotes.