HMRC have assessed that SimpleBooks is compliant with MTD for VAT
HMRC Guidance on MTD for VAT
https://www.gov.uk/guidance/making-tax-digital-for-vat
MTD applies to VAT periods commencing on or after 01/04/2019
Step 1
Sign up for MTD for VAT with HMRC - use the following link
Do this at least 7 days after making the payment for your last traditional VAT return and at least 14 days before the first MTD return is due
https://www.tax.service.gov.uk/vat-through-software/sign-up/have-software
Step 2) - do this 72+ hours after completing step 1) - 72 hours after step1) HMRC will confirm by email that migration to MTD for VAT is complete
Please note the connection will not work until HMRC have completed the migration process.
Settings/Integrations/Connect to MTD
The link connects SimpleBooks to the HMRC MTD Account
Then authorise the connection to HMRC click either
SETTINGS/INTEGRATIONS/View MTD details/Re-authorise now
or by the menu option
MTD for VAT/Re-authorise now
Agents can sign up for an Agent Services Account required for MTD
https://www.gov.uk/guidance/get-an-hmrc-agent-services-account