VAT for Builders: Rates, Rules and the Mistakes That Cost You

‍‌‌‌​‌​​​​‌​​‌​‌‌‌‌‌​‌​‌‌‌‌​‌‌‌​‍SiteKiln gives you plain-English information, not legal advice. If you need advice specific to your situation, talk to a qualified accountant or VAT adviser.

VAT is the thing that catches builders out more than almost anything else -- wrong rate, wrong treatment, missed threshold, and suddenly you owe HMRC thousands you didn't budget for.

1. Do you need to register for VAT?

You must register if your taxable turnover (what you bill before VAT, excluding zero-rated bits) is over the VAT threshold in a rolling 12-month period. The threshold figure changes occasionally, but recent construction guidance assumes you're watching it around the £90k mark -- always check the current number on GOV.UK.

Key points:

• Look at your last 12 months of invoices -- not just the tax year. If you cross the threshold, you normally must register within 30 days of realising.
• You can register voluntarily below the threshold, which can make sense if:
  • Most of your clients are VAT-registered businesses (main contractors, commercial clients), and
  • You buy a lot of materials/plant and want to reclaim VAT.
• Once registered, you must:
  • Charge VAT at the correct rate on taxable sales (unless reverse charge applies -- see below);
  • Submit VAT returns and pay HMRC on time (usually quarterly);
  • Keep proper VAT records.
• Reverse-charge sales (where the customer accounts for the VAT) don't count towards the threshold, but normal VATable sales do.

2. VAT rates on building work -- 20%, 5% or 0%

Most builders' VAT headaches are just about using the right rate.

Standard rate -- 20%

Charge 20% on most work on existing buildings, especially:

• Repairs and maintenance (roof leaks, damp fixes, re-wiring, boiler swaps).
• Extensions, loft conversions, conservatories on lived-in homes (unless a special 5% rule applies).
• Work on commercial premises (shops, offices, warehouses), unless specifically zero-rated.

If in doubt and no clear relief applies, it's usually 20%.

Zero rate -- 0% (you don't charge VAT)

You can often zero-rate (0%) when you're building new residential dwellings that meet strict rules.

Typical zero-rate cases:

• New build houses and flats that:
  • Are self-contained dwellings;
  • Are new, or involve full demolition to ground level;
  • Have the right planning permission (residential, not short-stay/furnished holiday lets).

If the job qualifies, you charge no VAT on your labour and most building materials you supply as part of the job.

Be careful: fit-outs of existing buildings, or partial demolitions, often don't qualify. Always check the details if you're anywhere near the margins.

Reduced rate -- 5%

The 5% rate mainly crops up in two areas:

Renovation of houses empty for 2+ years

• If a residential property has been empty for at least 2 years, many renovation and alteration works can be charged at 5%.
• You need evidence, e.g. council tax records or utility bills showing it's been empty.

Certain residential conversions

• Converting a non-residential building into dwellings (e.g. office → flats).
• Converting a single house into multiple flats or vice versa, in specific circumstances.

The rules are picky. When you suspect 5% might apply, it's worth checking HMRC's guidance or getting your accountant to sanity-check the job.

3. The VAT domestic reverse charge -- how it hits builders

The domestic reverse charge for building and construction services has applied since 1 March 2021.

It affects most CIS-type work between VAT-registered construction businesses.

What it actually does

For certain construction services, the customer accounts for the VAT instead of you.

As the subcontractor, you:

• Do not charge VAT on your invoice;
• Show the VAT amount that would apply, but mark it as "reverse charge -- customer to account for VAT to HMRC";
• Only record the net amount in your VAT return.

As the contractor receiving the invoice, you:

• Apply the correct VAT in your own VAT return as both output (sales) and input (purchases), so it nets off if you can reclaim it.

When the reverse charge applies (three tests)

Reverse charge does apply if:

1. The work is within CIS (construction services, not just pure materials), and
2. The supply is standard- or reduced-rate (20% or 5%, not zero-rated), and
3. Both you and the customer are VAT-registered and in CIS, and the customer is not an end user or intermediary.

If all three are "yes", you must use the reverse charge.

Reverse charge does NOT apply when:

• You're working for an end user (e.g. domestic customer, some developers or landlords who tell you in writing they're the end user).
• The customer is not VAT-registered.
• The work is zero-rated (e.g. qualifying new dwellings).
• You're only supplying materials, not construction services.

In those cases you use normal VAT rules -- charge VAT if you're registered and the job is vatable.

What goes wrong in practice

Common mistakes HMRC and professional bodies are seeing:

• Subcontractors charging 20% VAT to main contractors when they should have used the reverse charge -- HMRC can deny the contractor's reclaim and come after both sides.
• Treating domestic jobs as reverse charge -- they're not; you should charge normal VAT if registered.
• Failing to label invoices correctly -- invoices should clearly state that reverse charge applies, show the VAT rate and amount, and say the customer must account for it.
• Not realising reverse-charge turnover doesn't count towards registration threshold, and assuming you can stay off VAT forever -- HMRC still look at your other taxable sales.

For most small subbies, the safest approach is:

• Domestic clients = normal VAT rules.
• Main contractors / developers in CIS = reverse charge, unless they've clearly told you in writing they are the end user.

4. Flat Rate Scheme -- think twice now

The Flat Rate Scheme (FRS) used to be popular with small trades because it simplified VAT and sometimes saved money.

Under FRS:

• You still charge 20% VAT on most sales, but
• You only pay HMRC a fixed percentage of your gross turnover (which includes VAT) -- the % depends on your trade.

But:

• "Limited cost trader" rules mean many small traders pay a higher flat rate, and
• In construction, once the reverse charge kicks in, a big chunk of your sales may have no VAT on them, which can make the scheme pointless or worse.

Current accounting advice: don't assume FRS will save you money -- get an accountant to run the numbers for your actual mix of jobs (domestic vs contractor, materials heavy vs labour) before you join.

5. Common mistakes

• Ignoring the VAT threshold until HMRC write to you -- by then you owe backdated VAT and possibly penalties.
• Using the wrong rate -- charging 20% on a qualifying new build (should be 0%) or 5% on a normal repair (should be 20%).
• Not understanding reverse charge -- getting this wrong causes problems for both you and your contractor client.
• Joining the Flat Rate Scheme without checking the numbers -- it used to save money for many trades, now it often doesn't.
• Not keeping proper VAT records -- if HMRC visit, you need to show invoices, receipts and returns. "It's all in my head" doesn't work.
• Treating reverse-charge turnover as counting towards the threshold -- it doesn't, but your other vatable sales still do.

6. Straight-talking VAT checklist

• I know my last 12 months' turnover and whether I'm near or over the VAT threshold.
• I understand when to use 0%, 5% and 20% on domestic work (new build vs renovations vs normal repairs).
• I know when to apply the domestic reverse charge and my invoices clearly say when it applies.
• I don't treat domestic customers as reverse-charge -- I charge VAT normally if I'm registered.
• I've spoken to an accountant about whether Flat Rate or standard VAT is better for me, given reverse charge and my type of jobs.

7. Who to contact

• HMRC VAT helpline -- 0300 200 3700 (free)
• GOV.UK -- VAT registration -- check current threshold and register: gov.uk/vat-registration (free)
• GOV.UK -- VAT domestic reverse charge for construction -- official guidance: gov.uk/guidance/vat-domestic-reverse-charge-for-building-and-construction-services (free)
• GOV.UK -- VAT rates on building work -- rates for new builds, renovations, conversions: gov.uk/guidance/buildings-and-construction-vat-notice-708 (free)
• GOV.UK -- VAT Flat Rate Scheme -- how it works and whether to join: gov.uk/vat-flat-rate-scheme (free)
• Your accountant -- to check which scheme suits your job mix and run the numbers properly (paid)

8. Sources and legislation

• Value Added Tax Act 1994 -- framework for VAT registration, rates and returns. legislation.gov.uk/ukpga/1994/23
• VAT Notice 708 -- Buildings and construction -- HMRC guidance on VAT rates for building work (0%, 5%, 20%). gov.uk/guidance/buildings-and-construction-vat-notice-708
• VAT domestic reverse charge for building and construction services -- HMRC technical guidance. gov.uk/guidance/vat-domestic-reverse-charge-for-building-and-construction-services
• The Value Added Tax (Section 55A) (Specified Services and Excepted Supplies) Order 2019 -- the statutory instrument implementing the construction reverse charge. legislation.gov.uk/uksi/2019/892
• VAT Flat Rate Scheme -- HMRC guidance including limited cost trader rules. gov.uk/vat-flat-rate-scheme

9. Related guides on this site

• 1.7 Reverse charge VAT
• 5.13 Flat rate VAT scheme
• 8.1 Sole trader vs limited company -- honest comparison
• 8.4 Registering for CIS as a contractor
• 8.16 Scaling from one-man band to small firm
• S9 Setting up as a sole trader -- step by step

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