A practical guide for organisations moving from paper-based Direct Debit mandates to AUDDIS, covering what it is, timelines, risks and what to do first.
AUDDIS (Automated Direct Debit Instruction Service) is the Bacs system for managing direct debit mandates electronically. An AUDDIS migration is the process of converting your existing paper mandate archive into Electronic Mandate Records (EMRs) — enabling online and phone sign-up, reducing admin, and bringing your process into line with modern compliance expectations.
AUDDIS migration is the right move if your organisation is still holding physical signed mandate forms and processing collections from a paper-based record. Use the signals below to confirm.

You collect DDs but still require a physical form · You can't set up DDs online or by phone · Your mandates live in a filing cabinet or scanned folder

If you're also switching bureau, sequence the AUDDIS migration before or alongside · Don't start if your mandate archive has known gaps — remediate first

You already use AUDDIS and want to switch bureau — that's a bureau switch · You want to get your own SUN — that's FM to own SUN
Below is an example of the timeline:
Week 1 - Mandate data audit.
This is an important first step and if remediation work is required, this can add at least another 4 weeks to your project
Weeks 2-4 - Bank and Bureau/Software setup
Working with your Sponsoring bank and bureau to align on key tasks and target date for go live
Weeks 4-5 - Test
Test submission flows to Bacs and agre
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