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One charge per project phase, not by the calendar

By the end, you'll know how many installments to split a large payment into and what point in the project, not what date, triggers each one.

By Yodai · Published on September 6, 2026 · Updated on October 12, 2026

You've priced out a big job, a renovation, a custom piece of furniture, a full installation, and now it's time to decide how you'll get paid. The temptation is to split it up by the calendar: $1,000 on the first of every month until it's paid off. That's what a bank does with a loan, so it feels reasonable.

But your job doesn't move on a calendar. The first month might go by just waiting for materials to arrive. The second week you might get more done than in the next three combined. If payments follow the month, sooner or later you'll end up billing ahead of the work done, or way behind it. Both hurt: the first makes the client uneasy, the second leaves you financing the job out of your own pocket.

The real question to answer is what has to have happened on the job for that payment to make sense.

The job sets the milestone, not the month

A payment milestone is a snapshot of the work at a given moment. When you say "payment due when demolition is finished," anyone who walks in and looks at the job can confirm whether that moment has arrived. When you say "payment due on the fifteenth," all that has to happen is for the fifteenth to roll around, no matter what's actually happened on the job.

That difference looks small, but it isn't. With a date-based payment, the money and the work drift apart. With a milestone-based payment, they stay locked together: you can't bill the second installment without having done what that installment describes, and the client can't claim you're behind based on nothing but the calendar.

Picture an $8,000 kitchen remodel split into four monthly payments of $2,000. Demolition wraps up in the first ten days, then the job sits for three weeks waiting on the stone countertop installer, who's booked solid. With a date-based payment, you bill $2,000 in month two for a job that's stalled. With a milestone-based payment, that second installment doesn't come due until the countertop is in, and the client can see clearly that the money matches work done, not just that a month went by.

How many installments: one for every stage you can point to

There's no single number of installments that works for every trade, but there is a rule for finding it. Count how many moments in the job leave behind a stage that someone who hasn't been there every day can recognize just by looking. Each of those moments is an installment. Not one more.

If you add an installment for every week of work, you end up chasing small payments that don't match anything finished, and each one turns into its own negotiation. If you leave a single installment for the end, you're the one carrying the full cost of the job for weeks or months. And that's exactly what happens if you don't agree on anything: under the Civil Code, if there's no agreement or custom saying otherwise, the price of the job is paid upon delivery. An unexpected problem on the client's end, running out of cash, deciding not to continue, catches you having collected nothing for what's already done. If they decide not to continue, the same law requires them to pay you for your expenses, your work, and the profit you would have made, but you have to claim it. An installment you've already collected is already in your account. Watch out if the client is an individual and you closed the deal at their home: the Consumer Protection Law gives them fourteen days to back out with no reason needed, with exceptions like custom-made furniture, plus twelve more months if you didn't tell them about that right. If they back out, you return whatever they paid you, and you only keep what corresponds to the part already done if they asked you in writing to start before that period was up.

Between those two extremes is what you see in practice. For home renovations, the Comunidad de Madrid (Madrid's regional government) explains that companies usually ask for one payment upfront and another at the end, sometimes adding a third one halfway through the job. That's the baseline. A short job, a week or less, works with just those two: one at the start and one at delivery. A project with more visible stages can support a few more, and one that spans several months, with very distinct phases, might need five.

With the chunks already defined by project stage rather than by date, put them in writing in the estimate before the client accepts it. If you work with individual clients, Spain's Consumer Protection Law requires you to tell them about payment procedures before they're bound by the contract. After that, you still need to decide how much each one is worth in dollars. That's the next decision: how much you ask for before you touch the first material.

You already know how many installments to split the job into and which milestone triggers each one. What you haven't nailed down yet is the size of the first installment: how much to ask for before you touch the first material.