Walkthroughs and reference for every scheme, plus answers to the questions our customers ask most.
Connect your first accounting platform, add a firm, and run your first calculation.
The cross-client dashboard for practices: every client firm, organisation counts, subscription status and overdue-period alerts.
Create dummy organisations seeded with realistic data to learn each VAT scheme. Nothing is posted to a real accounting platform.
OAuth, scopes, multi-org connections, and what OneSixth does and doesn't read from your accounting data.
A planned direct HMRC MTD connection: stagger detection from live VAT obligations, filing reconciliation, and a VAT deadline calendar.
Quarterly provisional calculations, deferrals, the year-end annual adjustment, and the full audit trail.
Per-vehicle margin VAT for car dealers, with the stock book HMRC requires, DVLA lookups and bulk import.
Bulk margin VAT for high-volume, low-value second-hand goods.
Specialised margin scheme for the equine trade.
The standard per-item margin scheme for antiques, works of art, collectors' items, and general second-hand goods.
Setup wizard, tax-code mapping, transaction classification, the standard method, de minimis, the annual adjustment and SMO.
How OneSixth pricing works: graduated per-organisation tiers for practices, fixed monthly tiers for businesses by entity count, and a 25% charity discount that applies to either plan.
Business gets a 30-day full-product trial with no card needed. Practices get a 90-day welcome offer where the first organisation is free. Here's how each works and what happens at expiry.
Registered charities get 25% off either OneSixth plan (Practice or Business). We accept Charity Commission, OSCR and CCNI registration numbers, and HMRC CASC clubs by name. The discount is retroactive from when you provide your details.
Pro-rata charges when you add an organisation mid-cycle, automatic credit when you remove one, and how graduated tiers recompute.
Move between Practice and Business, change the billing contact email, hand over an organisation to or from a practice, or transfer between practices.
How to cancel, the 7-day export window, paid retention options for the HMRC six-year requirement, and what gets deleted when.
The dunning retry schedule, when an account moves to read-only, and how to recover after a failed payment.
How the Practice and Business plans differ, what we monitor for plan-fit issues, and how to switch if you've picked the wrong one.
Plain-English explanation of the trial, payment-issue, and cancelled / retention banners you may see at the top of OneSixth, and what to do about each one.