How to Migrate from Sage to Relentify: What to Expect

Sage has been the default choice for UK business accounting for four decades. You've got Sage Accounting (cloud) or Sage 50 (desktop), both recognized by HMRC for Making Tax Digital. But after years in Sage, you're probably thinking: do I need this, or do I need something faster?

Migrating from Sage to a modern platform like Relentify doesn't have to be the administrative nightmare you'd expect. This guide walks you through what to expect, whether you're on Sage Accounting or Sage 50 — and yes, there's a difference in how you do it.

Understanding Your Starting Point

Your migration path depends on which Sage product you're using.

Sage Accounting (cloud): Data exports to CSV through the web interface. Straightforward, similar to migrating from Xero or other cloud platforms.

Sage 50 (desktop): Data lives on your machine. Export is a bit more involved — you need the desktop app open and know where to find the export menu. The good news: once it's out, the import works the same way.

Both routes end in the same place. The only difference is how you get the data out of Sage.

When and How to Prepare for Migration

The best time to migrate is the start of a new financial year or VAT quarter. This gives you a clean break — your old Sage records stay put, your new Relentify records start fresh. No overlap, no confusion about which system owns which transaction.

For Sage 50 users specifically: if you're migrating at year-end, run Sage 50's year-end close before you export. This clears out profit-and-loss accounts and rolls the balance forward. You'll import a clean set of opening balances. (If you skip this step, you'll spend hours untangling retained earnings figures later.)

Pre-migration checklist for both Sage Accounting and Sage 50:

• Reconcile every bank account completely. No pending transactions.
• Process all outstanding invoices and bills. Get them out of the "to be sent" pile.
• Submit any pending VAT returns through Sage.
• Save PDF copies of: profit and loss, balance sheet, trial balance, aged debtors, aged creditors. You'll need these to verify your migration worked.
• Document your chart of accounts. Note any custom nominal codes you've created over the years.
• List recurring entries: standing invoices, standing bills, journal entries (depreciation, accruals, etc.).

If you're on Sage 50:

• Run the year-end close (File > Year End).
• Run a data check: File > Maintenance > Check Data. Sage will flag corrupted records. Fix them before exporting.
• Back up your Sage 50 data file. HMRC requires companies to hold records for at least six years; you'll want this anyway.

Exporting Your Data from Sage

If you're on Sage Accounting:

• Chart of accounts: Settings > Chart of Accounts > Export. You'll get a CSV.
• Contacts: Contacts section > Export. Covers customers and suppliers.
• Trial balance: Reporting > Trial Balance > Export for your migration date.
• Aged reports: Reporting > Aged Debtors and Aged Creditors. Export the details.

Sage Accounting's exports are standard CSV. They import cleanly into most platforms.

If you're on Sage 50:

• Chart of accounts: Company > Nominal Ledger > select all > File > Export > CSV.
• Customers: Customers > select all > File > Export > CSV.
• Suppliers: Suppliers > select all > File > Export > CSV.
• Trial balance: Financials > Trial Balance > print or save.
• Aged reports: Financials > Aged Debtors and Aged Creditors.

One thing: Sage 50 uses four-digit nominal codes (1001 = Bank Current Account, 4000 = Sales). Relentify's system is more flexible. When you import, Relentify maps standard codes automatically. Custom codes might need you to point at where they should go — which is why the "clean start" approach below often saves time.

Setting Up Relentify

Create your Relentify account and fill in the basics: company name, registration number, VAT number, financial year start date, VAT scheme, and bank accounts.

Chart of accounts: You have two choices.

Option 1: Clean start. Use Relentify's default UK chart. Add only the accounts you actually use. Sounds drastic, but Sage 50 users often have 80+ nominal codes accumulated over years, half of which are inactive. Migration is the right time to bin them. You'll get a simpler system and fewer reconciliation headaches.

Option 2: Full import. Upload your Sage CSV. Relentify maps the standard account types automatically. Anything that doesn't fit, you review manually.

For Sage 50 users, Option 1 usually wins. For Sage Accounting users with smaller, cleaner charts, Option 2 works fine.

Opening balances: Pull your trial balance from Sage. In Relentify, go to Settings > Opening Balances and enter each account's balance. Or use the bulk import template. Then run a trial balance in Relentify and match it to Sage's — every debit and credit must be identical. (If you ran year-end in Sage 50, your retained earnings will be a single rolled-up figure. Make sure that's entered correctly.)

Contacts: Upload your customer and supplier CSVs. Relentify maps name, email, address, phone, VAT number. Sage 50 exports might include stuff Relentify doesn't use (account reference codes, credit limits, default nominal codes) — the import tool flags these and you can decide whether to keep or drop them.

Outstanding invoices and bills: For unpaid items, create them in Relentify with their original dates and amounts. This keeps your audit trail clean and lets you track payments correctly. If you've got dozens of these, use Relentify's bulk import feature.

Recurring transactions: Standing invoices, standing bills, accruals, depreciation journal entries — recreate these in Relentify. A few hours of setup now beats months of manual entries later.

Bank feeds: Connect your bank via Open Banking in Relentify. Transactions from migration day forward will download automatically. (For Sage 50 users who've been importing statements manually, this is usually the moment you realize you should have switched years ago.)

Final Checks and Common Pitfalls

Before you flip the switch:

• Authorize MTD: Log into Relentify and authorize with HMRC for Making Tax Digital for VAT. This deauthorizes Sage, so make sure your last Sage VAT return has already been submitted.
• Run these verification checks:
  • Trial balance in Relentify matches Sage's totals, pound for pound
  • Bank balances match your actual bank statements
  • Outstanding receivables match Sage's aged debtors report
  • Outstanding payables match Sage's aged creditors report
  • MTD is active in Relentify

What about Sage 50 historical data? You don't need to move it. Keep your Sage 50 backup on a drive for twelve months minimum — HMRC's record-keeping rule covers it. The desktop application opens read-only even after your subscription expires, so you can always pull a historical invoice or check a prior-year figure if needed.

Timeline: Sage Accounting migrations take 2–4 hours. Sage 50 migrations run 4–8 hours, depending on how custom your chart is and how many outstanding transactions you've got. The extra time on Sage 50 is mostly the export process and deciding which accumulated nominal codes to keep (spoiler: fewer than you think).

Avoid these mistakes:

• Skipping Sage 50 year-end. If you're migrating at year-end, run the year-end close in Sage 50 before you export. You'll get clean opening balances instead of tangled retained earnings figures.
• Importing every nominal code. Years of "let's just add another one" means you've got codes for clients who left three years ago. Use migration as permission to delete them.
• Not saving Sage reports beforehand. Export everything you might need — P&L, balance sheet, aged reports — and save as PDF before you switch. Once you cancel or stop using Sage, accessing old reports is a pain.
• Skipping the VAT test. After MTD goes live in Relentify, calculate a test VAT return before you file your first real one. Make sure your VAT scheme settings are correct.
• Assuming Sage 50 data is clean. Run the data check (File > Maintenance > Check Data) before you export. Fix any flagged records in Sage, then export.

Frequently Asked Questions

Q: Can I migrate mid-year, or do I really need to wait for year-end?

A: Mid-year works fine. You'll just have a split record — Sage owns transactions up to migration day, Relentify owns transactions after. As long as you reconcile completely and move all outstanding items to Relentify, it's clean. Year-end is tidier only because Sage 50's year-end process simplifies your opening balances, but it's not mandatory.

Q: What if I've got three years of Sage 50 history I want to keep accessible?

A: Keep your Sage 50 data file backed up. You don't need an active subscription to open it read-only and look up an old transaction or invoice. HMRC requires you to keep records anyway, so you've got a legal reason to store it safely.

Q: Do I need Relentify to import my entire chart of accounts, or can I start fresh?

A: Start fresh. Relentify's default UK chart is comprehensive and well-organized. Add custom accounts only if you actually use them. Most Sage 50 migrations get smaller, simpler charts — and that's a feature, not a bug.

Q: What if my Sage data export fails or looks corrupted?

A: Run Sage's data check first (File > Maintenance > Check Data for Sage 50; Settings > System > Database Health for Accounting). Sage will tell you what's broken. Fix it, back up again, then export. Don't try to import broken data into Relentify.

Q: Can Relentify import my Sage data automatically?

A: Relentify's import tool handles CSV files. It's semi-automated — you upload the file, it maps the columns it recognizes, it flags anything unusual. You review and approve, then it imports. Not fully automated, but designed to be fast.

Q: Do I lose any functionality moving from Sage to Relentify?

A: Relentify doesn't replicate Sage 50's complex multi-user desktop architecture. But for core accounting — invoicing, bills, bank reconciliation, VAT, reporting — you get the same features plus things Sage doesn't offer, like built-in CRM, helpdesk, and time tracking. If you need a detailed comparison, read Relentify vs Sage.

Q: What about migrating from QuickBooks or another platform at the same time?

A: Migrate one system at a time. Complete the first migration, verify it's clean, then do the second. If you're looking at other platforms, we've got guides on migrating from QuickBooks and FreshBooks.

The Verdict

Migrating away from software you've used for years feels significant. But the actual process is structured, predictable, and doable over a weekend. You end up with a modern cloud platform, more features, better integration with other tools, and a lower monthly bill.

For most small-business owners, moving from Sage Accounting or Sage 50 to Relentify is the "why didn't we do this sooner?" decision.

Ready to start? Try Relentify free for 14 days and see how the migration would work for you.