Frequently asked questions

SmartC is a UK tax compliance platform covering MTD Income Tax Self Assessment (ITSA), CIS contractor returns, landlord bookkeeping, sole trader accounting, and personal income. It connects directly with HMRC via approved APIs.

SmartC is designed for three groups: (1) UK individuals who are self-employed, landlords, or have complex personal income; (2) accounting firms that manage multiple client tax filings; (3) accountants invited by firms to work on specific clients.

No. SmartC guides you through each step. Complex tax rules are translated into simple, clear forms. If you can use online banking, you can use SmartC.

Yes. Every new account starts with a 7-day free trial giving full access to all modules. No credit card required to start.

Individuals pay from £9/month. Firms start at £39/month for up to 25 clients. See our pricing page for full details including the Growth and Scale tiers.

No. Accountants invited to work under a firm account access SmartC at no charge. The firm's subscription covers all invited staff.

Yes. Cancel from your billing dashboard at any time. You keep access until the end of your current billing period. No cancellation fees.

We accept all major credit and debit cards via Stripe. Payments are processed securely — we never store card details directly.

Yes. SmartC integrates with HMRC's Making Tax Digital APIs. We hold the required authorisations for MTD ITSA and CIS digital submissions.

Making Tax Digital for Income Tax Self Assessment requires UK taxpayers with qualifying income to submit quarterly digital updates to HMRC from April 2026. SmartC handles this end-to-end.

SmartC handles quarterly MTD ITSA updates and final declarations. These replace and supersede traditional SA100 paper returns for MTD-mandated taxpayers.

Yes. You can connect a HMRC sandbox account to test submissions without affecting live filings. Ideal for firms training new staff.

All data is encrypted in transit using TLS 1.3 and at rest using AES-256. We are ICO-registered (UK data protection authority) and comply fully with GDPR.

Never. We share your data only with HMRC when you explicitly submit a filing. No data is sold or shared with advertising or analytics companies.

All data is stored in UK/EU data centres. We do not transfer personal data outside the UK/EEA.