I've helped dozens of couples plan their weddings, and the same surprise costs come up every single time. Here's what nobody warns you about:

1. Gratuities — Most venues don't include tips for servers, bartenders, and coordinators. Budget an extra 15-20% of your catering bill.

2. Alterations — Your dress or suit will need fitting. Alterations run $200-$800 depending on complexity. Always budget for this separately.

3. Postage — Between save-the-dates, invitations, and thank-you cards, stamps add up fast. For 150 guests, expect $150-$300 just in postage.

4. Day-of extras — Emergency kits, welcome bags, signage printing, last-minute décor. Set aside $300-$500 for things you didn't know you'd need.

5. Vendor meals — Your photographer, DJ, and planner need to eat too. Most venues charge $30-$75 per vendor plate.

The trick isn't eliminating these costs — it's knowing they're coming so they don't blow up your budget.

I built WeddingCraft to help couples plan smarter from day one. Budget templates, vendor tracking, timelines, and a community of couples going through it together — all for $1.