If you collect through a payment provider, you can usually be sending mandates to customers within a few days of signing up, once the provider has checked your business. After a customer signs, the mandate normally reaches their bank the same day, and the first payment lands in your account roughly one to two weeks later, depending on how much notice you give. Applying for your own Service User Number through a bank takes far longer, often weeks to months.
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The short version
- Through a payment provider, setup is mostly the provider's checks and usually takes days.
- You don't need your own Service User Number; applying for one through a bank takes weeks to months.
- Mandates are lodged electronically, usually the same day the customer signs.
- Advance notice and the three-day Bacs cycle mean the first payment typically lands one to two weeks after signing.
- Most time is saved by getting the mandate signed when the customer agrees to the work.
How long setup takes
Three separate waits get bundled into this question: becoming able to collect, getting a customer's mandate signed, and waiting for the first payment to land. For most businesses, setup itself is the shortest of the three.
To collect by direct debit, payments have to run under a Service User Number (SUN), the six-digit identifier the Bacs scheme gives every organisation that collects this way. You can get one in two ways.
Through a payment provider, you collect under the provider's SUN. Setting up is mostly the provider checking your business, and you can usually start within days rather than weeks. With Adfin you don't need your own SUN or a direct debit facility from your bank: direct debit needs a few extra checks on top of the standard verification, usually including a short onboarding call, and after that you can send mandates.
Your own SUN means applying through a sponsoring bank, which assesses your business before agreeing to carry the risk of your collections. Banks generally look for an established trading record and may ask for security, and providers who help with applications quote timescales of anything from a few weeks to several months. For most small and medium businesses it's unlikely to be worth it unless you have a specific reason to collect in your own name, and even that is available through a provider for a monthly fee.
When the customer signs the mandate
Once you can collect, each customer has to authorise you. Today that's almost always an online form: the customer enters their bank details, confirms the mandate, and the instruction is sent to their bank electronically through AUDDIS, the Bacs service for lodging mandates without paper.
That electronic step is quick. On Adfin, 96.4% of mandates reach the customer's bank on the day they're created.
The slow part is usually the customer getting round to it. A mandate request sent by email a few days after the work was agreed competes with everything else in their inbox, and it's common for a handful of customers to leave it for weeks. Nothing downstream starts until they sign.
From signed mandate to money in your account
Two things sit between a signed mandate and a payment in your account.
Advance notice comes first. Under the Direct Debit Guarantee, your customer must be told the amount and date before each collection. The Guarantee says this is normally 10 working days, or as otherwise agreed, and providers commonly use a shorter period of a few working days.
Then there's the Bacs cycle and your payout. Bacs processes a collection over three days, and the money then reaches you on your provider's payout schedule. Adfin, for example, notifies customers at least three working days before each collection and pays direct debits out in full within three working days of the collection date.
Say a new customer signs their mandate on a Monday and you set their first collection for the following Monday. The mandate is lodged with their bank the same day, they're notified well over three working days ahead, the collection is taken on the Monday and the money is usually in your account by the Thursday. That's about ten days from signature to cash. If you've agreed the default 10 working days' notice instead, add a week or so.
From the second collection onwards there's no setup at all. Each payment just needs its advance notice, and amounts can change from one collection to the next under the same mandate, provided you tell the customer beforehand.
How to shorten the wait
Most of the time you can save is in getting the mandate signed.
- Ask for the mandate when the customer agrees to the work. Putting it in the same step as signing a proposal, engagement letter or contract removes the follow-up email entirely. Some proposal tools used by accountancy practices, such as Socket, can capture the mandate as the proposal is signed.
- Agree a short notice period in your terms, and stick to it every time.
- Chase unsigned mandates promptly and more than once, and offer another way to pay, such as a card or pay by bank link, so an invoice due before the mandate is signed still gets paid.
- Don't wait for a direct debit for a first payment you need quickly. Take it by card or pay by bank (pay by bank reaches you the same day on Adfin), then use the mandate for everything after it.
Adfin chases unsigned mandates automatically. Once customers are set up, what's left is mostly exceptions, such as a cancelled mandate or a failed collection, and its Customer Agents can pick those up over email, SMS or WhatsApp, within rules you set and approve.
Common questions
How long does it take to set up direct debit for a business? Through a payment provider, usually a few days for the provider's checks. Applying for your own Service User Number through a bank can take weeks to months.
Do I need my own Service User Number? Not if you collect through a provider such as Adfin, which collects under its own SUN. You can still show your business name on customers' statements for a monthly fee.
How quickly does a mandate reach the customer's bank? Usually the same day it's signed, because it's lodged electronically. On Adfin, 96.4% are lodged on the day they're created.
How much notice do I have to give before collecting? The Direct Debit Guarantee says normally 10 working days, or as otherwise agreed. Adfin notifies customers at least three working days before each collection.
How long until the first payment reaches my account? Typically one to two weeks after the customer signs, depending on the notice period, the three-day Bacs cycle and your provider's payout time.
Can I take the first payment faster? Yes. Take the first payment by card or pay by bank (pay by bank reaches you the same day on Adfin), then collect later payments by direct debit.
Sources
- Bacs - Direct Debit (accurate as of October 2026) https://www.bacs.co.uk/bacs-schemes/direct-debit/
- Bacs - AUDDIS (accurate as of October 2026) https://www.bacs.co.uk/bacs-schemes/direct-debit/services/auddis/
- Pay.UK (Direct Debit) - The Direct Debit Guarantee (accurate as of October 2026) https://www.directdebit.co.uk/direct-debit-explained/direct-debit-guarantee/
- Adfin Help Center - Completing verification to enable payments (accurate as of October 2026) https://support.adfin.com/en/articles/10199601-completing-verification-to-enable-payments
- Adfin - Pricing (accurate as of October 2026) https://www.adfin.com/pricing
