How to Set Up Sage Accounting for UK Trades (VAT, CIS, MTD in One Go)

Sage Accounting

HMRC Government Gateway

Why Sage still dominates UK trades books

Sage Accounting handles CIS, MTD and reverse charge in one product without add-ons.

Sage has been around since 1981. It owns over thirty percent of UK small business accounting and it is, for better or worse, the system most accountants ask for when you walk into their office. That alone is a good reason to consider it. Hand a Sage backup to your accountant and they will know exactly what to do with it.

For trades specifically, the appeal is narrower than the marketing suggests. Sage Accounting handles three things that almost every UK trades business needs and that most general accounting tools either skip or charge extra for: the Construction Industry Scheme, the domestic reverse charge VAT for construction services, and Making Tax Digital for both VAT and Income Tax Self Assessment. All three are built in. None of them need a third-party add-on.

The corporate Sage guides do not say much about the trades reality though. CIS only appears on the Standard plan and above. The Start plan is too thin if you ever take on a subcontractor. The Sole Trader plan, launching at £7 per month from April 2026, finally gives subcontractors a clean home but it is not the right fit if you also act as a main contractor. So plan choice matters more than people realise. Get that wrong and you end up paying twice, or worse, paying for a CIS module from another vendor when you already had one sat unused.

If you are weighing Sage against the rest of the market, our Xero vs QuickBooks vs Sage tax compliance comparison walks through the head-to-head trade-offs. This article assumes you have already decided Sage is your tool, and want to set it up properly the first time.

Step 1: Pick the right Sage plan for your trade

This is where most trades get it wrong. The Start plan is the cheapest at £15 per month plus VAT, but it has no CIS, no multi-user access and no cash flow forecasting. Most UK gas engineers, electricians and plumbers will outgrow it within a quarter.

Here is the honest breakdown of what each plan does for a UK trades business.

Promotional discounts come and go. Sage runs 90 percent off for the first three to six months fairly often. Do not pick a plan based on the promo price though. Pick it based on whether the features support your business twelve months from now.

Step 2: Set up your business profile and chart of accounts

The first thirty minutes of Sage setup decide whether your CIS and VAT returns will be clean.

Sign up at sage.com, choose your plan and you land on the setup wizard. The wizard is fine but it skips two things that matter for trades.

The first is the trade-specific chart of accounts. Sage gives you a generic small business chart by default. For a trades business you want a few extra income and expense categories that map to how HMRC and CIS think: CIS Labour Income, CIS Labour Expense, Materials, Plant Hire, Subsistence, Van Running Costs and Tool Replacement as a minimum. Add these under Settings → Chart of Accounts. Use the existing four-digit code structure so reports continue to roll up correctly.

The second is VAT scheme selection. If you are below the £90k threshold you are probably on no scheme, which is fine. If you are above it, decide between standard accrual VAT, cash accounting, or the flat rate scheme. Our flat rate vs standard VAT calculator walks through which one wins for your margin profile. Pick the scheme in Settings → Accounting Dates & VAT before you raise your first invoice. Changing it later is not the end of the world but it makes your first quarterly return messier than it needs to be.

Step 3: Switch on CIS and verify your first subcontractor

CIS verification still routes you to HMRC. Sage holds the records, HMRC confirms the deduction rate.

Go to Settings → Business Settings → Construction Industry Scheme. Tick "I am a CIS contractor" or "I am a CIS subcontractor" or both, depending on how you trade. Most established trades are both: they take on subbies and they get paid by larger main contractors who deduct CIS from their labour line.

Enter your own UTR, your Accounts Office reference and your PAYE reference. Sage uses these to build your CIS300 monthly return, so a typo here will haunt every return until you fix it. Double check.

Once CIS is switched on, add each subcontractor as a supplier. Go to Contacts → Suppliers → New. On the CIS tab, tick "Registered contractor in the CIS scheme" and fill in the Registered CIS Name (exactly as HMRC has them on file), Deduction Rate, UTR, Organisation Type (Sole Trader, Partnership, Limited Company or Trust), National Insurance Number, and Company Registration Number if relevant. Before saving, click the Account Details tab and set the default ledger account to CIS Labour Expense. This single click stops three months of mis-coded transactions.

Then verify them with HMRC. From the subcontractor record, CIS tab, pencil icon, choose "Verify Details with HMRC." Sage opens HMRC's verification tool in a new tab. There is no inbuilt verification mechanism inside Sage itself. As Andrew from Sage support put it in a community thread: "the link does take you to the HMRC where there is a link to their tool for verification." Sign in to Government Gateway, confirm the subcontractor's registration, and HMRC returns the correct deduction rate. Update the rate in Sage if HMRC has them on a different rate to what you assumed.

One quirk worth flagging. Sage only creates CIS subcontractor records for UK addresses with pound sterling as the currency. If you take on an Irish subbie working a one-week job over here, you cannot record them as a CIS subcontractor in Sage Accounting. That is a CIS rules issue, not just a Sage limitation, so worth a quick conversation with your accountant before you sign the deal.

Step 4: Connect Sage to HMRC for MTD for VAT

If your rolling twelve-month turnover crosses £90k, you must register for VAT and you must submit returns through MTD-compatible software from your very first return. Sage is HMRC-recognised for both MTD for VAT and MTD for ITSA, so there is no compatibility worry, only an authentication step.

Go to Reporting → VAT Returns. Sage prompts you to authorise it with HMRC. Click Continue, sign in with your Government Gateway, grant permission, and you are connected. The authorisation lasts eighteen months before Sage asks you to reauthorise. Stick that in a calendar reminder now or it will catch you off guard.

While you are in VAT Returns, set the period. Sage auto-detects your VAT quarters from HMRC once you authorise. Worth a quick sanity check though, because the dates Sage shows must match what HMRC has on file. If they do not, fix it at HMRC's end first, then reauthorise in Sage.

Step 5: Configure the domestic reverse charge for construction

The domestic reverse charge shifts VAT responsibility from subbie to main contractor on construction services.

The domestic reverse charge VAT for construction services came in on 1 March 2021. It catches almost every VAT-registered subcontractor and every main contractor in the UK construction supply chain. If you supply construction services to another VAT-registered business that itself goes on to supply construction services, you do not charge VAT. The recipient self-accounts for it on their own return.

In Sage, this works through tax code T21 at twenty percent for standard rated work and T26 at five percent for reduced rated work. Both codes were added to Sage Accounting and Sage 50cloud Accounts ahead of the 2021 deadline, and they have stayed unchanged since.

Two settings make the reverse charge work properly. First, in each construction customer's contact record, tick "Use VAT reverse charge for construction services." Sage will then apply T21 (or T26) automatically when you raise an invoice for that customer. Second, when you create the invoice, double check the VAT line shows the VAT amount calculated and then reversed to zero. As Sage support representative Rob put it: "the VAT amount displayed on the invoice but reversed so no VAT is charged, and your Net Sale is recorded in box 6 of your VAT Return as normal."

If you are on the Flat Rate Scheme, the reverse charge sits outside the scheme. Use tax code T21 and account for it as normal. Do not include reverse charge sales in your flat rate turnover, because they were never your VAT to keep.

For a fuller walk-through of which jobs qualify and which do not, our complete guide to the domestic reverse charge VAT for construction covers the edge cases. The Sage side, once T21 and the customer flag are set, is fire-and-forget.

Step 6: Connect bank feeds and train Sage Copilot

Bank feeds and Sage Copilot turn a Sunday night admin slog into a fifteen-minute job.

This is where the time savings show up. Sage connects to over ten thousand global banks and credit card providers, including all the major UK business accounts. Tide, Starling, NatWest, Lloyds, Barclays, Monzo Business and Revolut Business all feed cleanly. Go to Banking → Connect Your Bank, search for your provider, authorise, and your transactions start appearing in Sage within minutes.

Once the feed is running, the AI side starts earning its keep. Sage Copilot, the AI assistant built into Sage Accounting, watches every transaction you categorise. After about twenty manual categorisations on a typical UK trades account, it has learned your patterns: Screwfix to Materials, Travis Perkins to Materials, Diesel and Costa to Subsistence, that fixed monthly to Insurance, the Friday wages run to Subcontractors. From there it suggests the category for new transactions and you just confirm.

Bank rules go a step further. Tell Sage that anything from "WICKES BUILDING SUPPLIES" goes to Materials with VAT code T1, and every Wickes transaction from there on auto-codes itself. Set ten or fifteen rules covering your top suppliers and roughly eighty percent of your transactions classify themselves. Month-end reconciliation that used to take a Sunday evening drops to about fifteen minutes.

If you want to push this even further, the academy has a worked example pairing Sage with field service tools in our Sage and ServiceM8 integration playbook, and a deeper automation in our Commusoft, Sage and n8n monthly P&L dashboard.

Step 7: Prepare for MTD for ITSA before April 2026

From April 2026, Making Tax Digital for Income Tax Self Assessment becomes mandatory for self-employed individuals and landlords with qualifying income above £50,000. The threshold drops to £30,000 from April 2027. If your trade turnover is in either band, this affects you.

Sage is HMRC-recognised for MTD for ITSA and the workflow is already live in Sage Accounting. You do not need to wait. Switch it on now and use the next two quarters as a dry run.

To turn it on: Settings → Business Settings → Self Assessment for Sole Traders → Connect to HMRC. Same Government Gateway authentication as MTD for VAT. Once connected, Sage builds quarterly income and expense summaries from your bank feed and Chart of Accounts and submits them on the deadline. You still file an end-of-period statement and a final declaration once a year, but the quarterly grind is automated.

For the trades-specific automation patterns that make MTD ITSA painless, see our MTD Phase 2 trades automation playbook and the step-by-step setup for digital tax records.

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