Most group trip drama starts with mismatched assumptions about money. One short conversation before anyone books prevents it.
Start with a range
Agree on a minimum and maximum per person for the big buckets: lodging, transport, food, activities. Ranges give people room to say yes without locking anyone into someone else’s number.
Separate shared from optional
Make a short list of shared costs (lodging, group transport) versus optional costs (solo excursions, fancy dinners someone wants to skip). You’ll argue less about splits because fewer things are actually shared.
Next step
Once the crew agrees on ranges, run the numbers through the trip budget calculator to see per-person totals.