How to budget for a wedding: a month-by-month plan

You will find a national average wedding cost quoted everywhere, and it is close to useless for planning. It is an average over a hotel ballroom for 220 and a registry office followed by lunch for 30, and it tells you nothing about the wedding you are having. Worse, it anchors you: people who read a big number first tend to build a budget down towards it rather than up from what they want.

So start at the other end. This guide builds the number from your own list, converts it into a monthly set-aside, and then does the thing most wedding budgets never do — checks that figure against the money your ordinary month actually leaves over.

Step 1: count the months, before you count the money

The single most useful figure in a wedding budget is not the total. It is the number of months between now and the date, because that is the denominator for everything else.

Count them honestly. If you are getting married on 12 September and it is now 26 August, you have twelve full months and a few days, not thirteen. And the last month is not usable saving time in most cases — final balances are typically due before the day, not on it — so plan on eleven.

Write that number down. Every decision from here is really a decision about it.

Step 2: build your own total from line items

Take an hour and list the things you are actually buying. Not categories — items, with a real price beside each, from a real quote or a real website. Where you have not got a quote yet, put in your best guess and mark it, so you know which figures are load-bearing.

Here is one couple’s list for roughly 80 guests. These are illustrative figures, not market rates — the point is the shape of the list, not the numbers in it. Yours will differ, sometimes by a lot.

The contingency line is not optional and it is not padding. Wedding budgets do not overrun because of one bad decision; they overrun because of forty small ones — the extra hour of band, the corkage nobody read, the second alteration, the four guests who said yes late. Ten per cent is the floor. If more than half your rows say “estimate”, use fifteen.

Step 3: divide, and look at the number honestly

Now the arithmetic that matters. Take the total, subtract anything you have already saved and anything genuinely committed by family, and divide what is left by the months you counted in step one.

That figure — €1,652 a month, or €826 each — is your wedding budget. The €27,170 was never the budget; it was the consequence of it. And this is the number to react to, because it is the one you will feel in September, and in October, and every month after.

Step 4: check it against your real surplus

This is the step almost every wedding spreadsheet skips, and it is the reason so many of them get abandoned. A wedding set-aside is not free money. It comes out of the same account as groceries and rent, and it competes with them.

So work out your actual monthly surplus: your income, minus everything you genuinely spend in an ordinary month — not your intended budget, your real average over the last three months. Then subtract the wedding figure.

• If what remains is comfortably positive, the plan is real. Set it up and stop thinking about it.
• If it is barely positive, the plan is real but fragile: one car repair breaks it. Go back and pull one of the levers below rather than relying on eleven perfect months in a row.
• If it is negative, you do not have a budgeting problem. You have a scope or a date problem, and the good news is that you have found it eleven months early instead of three months late.

Doing this against a real average rather than a guess is the whole point. Working out your genuine monthly surplus is worth the half hour on its own, wedding or not.

Step 5: the four levers, in order of how much they move

When the monthly figure does not fit, there are only four things you can change. They are not equally powerful, and people usually reach for them in exactly the wrong order.

1. The date. The strongest lever by far, and the one people consider last. Moving from eleven months to eighteen takes the example above from €1,652 a month to €1,009 — a 39% cut, without removing a single thing from the day.
2. The guest count. The second strongest, because it multiplies. Catering, drinks, stationery, favours, transport and often the venue tier all scale with heads. In the list above, twenty fewer guests takes roughly €3,400 out.
3. The scope. Dropping whole line items — the band, the second photographer, the styling package. Effective, but each cut is small and each one is a conversation.
4. The contributions. Real, but not yours to control, and the least reliable thing to build a plan on. Treat anything here as upside, never as a load-bearing input.

Notice that the two strongest levers are both decisions you make once, early, and never revisit. The weakest one is the one that generates eleven months of small arguments. Pull the top of the list first.

Step 6: deposits break the flat monthly divide

Here is the thing that catches people who did everything else right. Dividing the total evenly across eleven months tells you what you need to save. It does not tell you what you need to have, and suppliers want deposits long before the day.

A typical shape: venue takes 25% at booking, photographer and band take a third each on signing, and the final catering balance falls two to four weeks before the wedding. Run it out and the cash you need on hand looks nothing like a flat line.

That schedule comes to the €24,700 subtotal, not the €27,170 total: the contingency is deliberately not scheduled anywhere. It is there to absorb whichever of these rows turns out to be wrong.

Two consequences. First, month one needs €2,800 available, not €1,652 — so either the existing €4,000 covers it, or booking has to wait. Second, the biggest single payment lands last, which is actually the friendly case: it is the one your eleven months of saving is aimed at. Where people get hurt is when a large payment falls in month three and the saving has not caught up.

Lay the due dates out before you sign anything. If a deposit lands before you can cover it, that is a reason to move the date, not a reason to reach for a credit card at 20% APR.

Step 7: keep it beside the everyday budget, not in another file

A wedding budget in its own spreadsheet is accurate for about three weeks. It goes stale for a structural reason: it has no idea what you actually spent. It cannot tell you that this was the month groceries ran €180 over and the set-aside did not happen, because it never sees your groceries.

What you want is one view where the €1,652 sits next to this month’s ordinary spending, so the question “can we afford dinner out this week” has an answer that already accounts for the wedding. That is a different tool from a spreadsheet, and it is the one thing that keeps the plan honest for eleven months instead of three.

A month-by-month checklist

• Month 0. Count the months. Build the line-item list. Add contingency. Divide. Check against your real surplus before you book anything.
• Months 1–2. Book the things that scale with guest count first — venue and catering — because they lock the number that drives everything else.
• Months 3–6. Replace estimates with quotes as they arrive. Every time a guess becomes a real price, redo the division. The monthly figure should be drifting down, not up.
• Month 7. Halfway audit. Compare what you have actually set aside against what the plan said. If you are behind by more than one month’s worth, pull a lever now, not in month ten.
• Months 8–10. Confirm final numbers and final balance dates. Guest count firms up here, and it is the last chance it moves anything.
• Month 11. Pay the balances. Keep the contingency until after the day — the small costs land in the final fortnight.

The short version

Count the months first. Build the total from items you can actually price, not from an average. Add ten per cent. Divide. Then check the monthly figure against the surplus your real spending leaves you — and if it does not fit, move the date or the guest count, in that order, as early as you possibly can.

A wedding budget that fails usually failed in month one, on paper, and nobody noticed until month eight. Twenty minutes of division is what buys you those seven months.