Take the deposit by card or open banking so the money is yours immediately, and get the mandate signed in the same conversation. The balance then needs advance notice of its amount and date before you can collect it, so the sequence is mandate, deposit, notice, collection, with the Bacs cycle adding a few days at the end.
In this article
The short version
- A direct debit authorises you to collect varying amounts "as long as the customer has been given advance notice of the collection amounts and dates", and that notice applies to your balance collection.
- The Direct Debit Guarantee puts notice of a change to the amount, date or frequency at "normally 10 working days" in advance, "or as otherwise agreed".
- Deposits are better taken by card or open banking, since those are immediate and a new mandate plus the Bacs cycle takes days.
- Get the mandate signed while your customer is paying the deposit. Coming back for it later is a second conversation you don't need.
- A changed balance needs no new mandate, only fresh notice of the new amount and date.
- Bacs clears a collection over roughly three working days, so the balance reaches your account after the collection date, not on it.
The order to do this in
Two orders are possible and one of them causes most of the trouble.
Deposit first and mandate later means chasing a signature after your customer has already paid you something, at the point their urgency has gone. You've committed to the work, the balance has no collection mechanism behind it, and you're back to invoicing and waiting.
Mandate and deposit together, in one interaction, is the version that holds. Your customer agrees the price, signs the mandate and pays the deposit while they're still in the conversation that made them want to buy. Adfin does this at proposal signature, with the price agreed, the mandate signed and the collection live in one client interaction.
Either way, your balance collection carries the notice obligation, and the rest of this page is about getting that right. The sequence looks like this:
| Step | What happens | Who it depends on |
|---|---|---|
| Mandate signed | Your customer authorises their bank, usually lodged the same day | Your customer, once |
| Deposit taken | Card, wallet or open banking, so the money is immediate | Your customer, once |
| Notice of the balance | You state the exact amount and the exact date | You, ahead of the collection |
| Collection submitted | Submitted for the date you gave notice of | You |
| Money received | Bacs entry day, plus your provider's settlement terms | The Bacs cycle |
Step one: get the mandate signed
A mandate is an instruction from your customer to their own bank, so the wording and the lodging are not yours to improvise. Direct debit mandates covers what makes one valid, and direct debit for UK businesses covers what you need in place before you can collect at all.
Three things matter for this job. Take the mandate paperless where you can, since a signature captured online or by phone usually reaches the bank the same day. Set it up for the account and not for one payment, because you'll collect the balance and possibly more later. And check the account name matches the customer you're contracting with, since a mandate signed on a personal account for a company job is the mismatch that surfaces when a collection is disputed.
On timing, most mandates reach the payer's bank the day they're created and 97.6% within a week (Adfin platform data, measured on the 49,828 mandates carrying a lodging timestamp), so the mandate is rarely your delay. The notice period is.
Step two: take the deposit by an instant method
Direct debit works poorly for a deposit. A brand new mandate plus a notice period plus the Bacs cycle puts the money days away, and a deposit exists to be certain before you start.
Card, Apple Pay, Google Pay and open banking all take a deposit in seconds from your customer's side. Open banking pushes the money over Faster Payments, and a card gives your customer chargeback rights they may want on a large advance. Taking payments in the UK compares the methods on cost and settlement.
Two practical points. Make the deposit its own invoice or line, so your ledger shows what's paid and what's outstanding without arithmetic. And agree with your accountant how the deposit and balance appear on your invoices, since what you invoice when affects your VAT reporting.
Step three: give notice of the balance
Notice is a condition of collecting, not a courtesy. Bacs defines a direct debit as authority to collect varying amounts "as long as the customer has been given advance notice of the collection amounts and dates", and the Direct Debit Guarantee sets the period for a change of amount, date or frequency at "normally 10 working days" in advance, "or as otherwise agreed".
Two things follow. Your notice has to state the exact amount and the exact date, so a schedule that says "the balance on completion" doesn't do the job. And the notice period runs before the Bacs cycle, not alongside it, so a balance you want in the bank on the 30th needs the notice out well before the 20th.
The cleanest version is one notice, at the start, for a stated amount on a stated date. Where you agree a shorter period than ten working days with your customer, get it in writing, since the scheme's own wording allows it and you'll want the evidence if the collection is ever queried.
Step four: collect, and reconcile both payments to one job
Submit the collection for the date you gave notice of, and expect the money afterwards. Bacs describes the process as taking "less than three days from start to finish" across input, processing and entry days, and your provider's settlement terms come on top.
An invoice due on the 30th and collected on the 30th shows as paid a few days later, so your deposit and your balance will look like two different standards of punctuality. Why direct debit payments look late when they are not covers reading that correctly.
For reconciliation, keep the deposit and the balance pointing at the same job: a shared reference where they're separate invoices, and matching that handles part payments where they're one invoice paid twice by two different methods.
If the balance changes after the mandate is signed
Nothing about the mandate needs redoing. A direct debit collects varying amounts by design, so a scope change or a variation to the price doesn't invalidate the authority your customer gave.
What has to happen is fresh notice. Tell your customer the new amount and the new date, in writing, in time for the notice period you're working to. If the change lands too late for that, you have two honest options: collect the amount you gave notice of and collect the difference later, or agree a shorter notice with your customer in writing and collect the revised figure.
Collecting a figure that differs from your notice is the version to avoid. Providers list a difference between the collection and the advance notice among the grounds for an indemnity claim, which means the bank refunds your customer and reclaims the money from you, so a variation handled in an email you kept is much cheaper than one handled optimistically.
If the balance collection fails
Failures on a balance collection are usually mechanical, not a dispute. The bank returns a reason code covering a closed account, a cancelled mandate or insufficient funds, and failed payments and how to recover them covers what each one wants from you.
Retrying is worth it. Across direct debit requests on Adfin that suffered a failed attempt, 60.1% were still collected (Adfin platform data, 269,518 collections first attempted between July 2024 and mid-July 2026), and a retry sits on the same mandate and needs notice of its own date.
Where the mandate itself has been cancelled, your balance is an ordinary receivable again. Send a payment link and ask what changed, since a cancellation tells you something about the relationship and not about your plumbing.
Common questions
Can I take a deposit by direct debit? You can, and it's rarely worth it. A new mandate, a notice period and the Bacs cycle put the money several days away, which defeats the purpose of a deposit. Card, a wallet or open banking gives you the deposit immediately, and the mandate then covers the balance.
Do I need the mandate before I take the deposit? Not legally, but getting both in one interaction is what tends to work. Your customer signs the mandate while they're agreeing the price and paying the deposit, so you're not chasing a signature afterwards from somebody whose urgency has passed.
How much notice do I have to give before collecting the balance? Advance notice of the amount and the date is a condition of collecting. The Direct Debit Guarantee describes the period as normally 10 working days in advance of a change to the amount, date or frequency, or as otherwise agreed, so a shorter period agreed with your customer in writing is within the scheme's own wording.
What if the final balance is different from the figure on the mandate? A direct debit collects varying amounts, so the mandate stands. Give fresh notice of the new amount and date before you collect. Collecting a figure that differs from your notice is one of the grounds providers list for an indemnity claim, so the notice is what protects you.
When does the balance actually reach my account? After the collection date, not on it. Bacs describes the cycle as taking less than three days from start to finish, and your provider's settlement terms are added to that. An invoice collected on its due date will still show in your reports as paid a few days afterwards.
What happens if the balance collection fails? The bank returns a reason code telling you whether the account has closed, the mandate has been cancelled or the money wasn't there. Retrying is often successful: 60.1% of direct debit requests on Adfin that suffered a failed attempt were still collected, on 269,518 collections first attempted between July 2024 and mid-July 2026.
Sources
- Bacs — Direct Debit (accurate as of August 2026)
- Bacs — Direct Debit, getting started (accurate as of August 2026)
- Direct Debit — the Direct Debit Guarantee (accurate as of August 2026)
This article describes UK direct debit scheme requirements as published by Bacs and Pay.UK and is not legal or financial advice. Parts of the Bacs rulebook are available only to registered service users, so where a requirement comes from provider documentation rather than published scheme material, that is stated. Last updated August 2026.
